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X-MS-Exchange-CrossTenant-AuthSource: SN6PR13MB2334.namprd13.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 127d41da-cc9c-48da-1655-08d880e5b8eb X-MS-Exchange-CrossTenant-originalarrivaltime: 04 Nov 2020 17:19:00.9286 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 0fee8ff2-a3b2-4018-9c75-3a1d5591fedc X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: oUkwk05dJZoVmfLrttaR5mb3Yy5BU8q2kkdzomGWT6qnbU3iht7A6p+Dv7Qrh7aQbBoReWh6vv5MkFLzhn1BSQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN6PR13MB2496 Archived-At: Subject: [Lsr] 5G Edge -Computing Solution drafts can be used for Dyncast (dynamic anycast) use cases X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 04 Nov 2020 17:19:06 -0000 --_000_SN6PR13MB23340B6747554039B178957D85EF0SN6PR13MB2334namp_ Content-Type: text/plain; charset="iso-2022-jp" Content-Transfer-Encoding: quoted-printable Yi Zhou, Liang, Peng, and Peter, We have 4 IETF drafts describing the different aspect of the solutions to 5= G Edge computing, which can cover your use cases and requirement described = in draft-geng-rtgwg-cfn-dyncast-ps-usecase: Through working on the 3GPP Release 17=1B$B!G=1B(Bs 5G Edge Computing proje= ct (3GPP TR23.748), we noticed that IP Layer can do more to optimize the 5G= Edge computing services. https://datatracker.ietf.org/doc/draft-dunbar-ippm-5g-edge-compute-ip-layer= -metrics/ describes the IP Layer metrics and methods to measure = the Edge Computing Servers running status and environment for IP networks t= o select the optimal Edge Computing server location in 5G Edge Computing (E= C) environment. This document also describes the method of incorporating th= ose measurements with IP routing cost to come up with a more optimal criter= ia in selecting ANYCAST locations. https://datatracker.ietf.org/doc/draft-dunbar-6man-5g-edge-compute-sticky-s= ervice/ describes a solution of using IPv6 extension header to h= elp Ingress router to stick traffic from a UE to the original App Server wh= en the UE moves from one 5G Site to another. https://datatracker.ietf.org/doc/draft-dunbar-idr-5g-edge-compute-app-meta-= data/ describes a new BGP Network Layer Reachability Information (BGP NLRI)= Path Attribute, AppMetaData, that can distribute the 5G Edge Computing App= running status and environment, so that other routers in the 5G Local Data= Network can make intelligent decision on optimized forwarding of flows fro= m UEs. The goal is to improve latency and performance for 5G Edge Computing= services. The extension enables a feature, called soft anchoring, which ma= kes one Edge Computing Server at one specific location to be more preferred= than others for the same application to receive packets from a specific so= urce (UE). https://datatracker.ietf.org/doc/draft-dunbar-lsr-5g-edge-compute-ospf-ext/= describe OSPF extension for the Routers that collect the IP Layer Metric= s to propagate to all other routers. Please let us know if the proposed solutions can solve your use cases. Thank you Linda Dunbar From: rtgwg > On Beha= lf Of Liyizhou Sent: Monday, November 2, 2020 1:17 AM To: rtgwg@ietf.org Cc: Lifeng (Frank) = >; Peng Liu >= ; gengliang@chinamobile.com Subject: Dyncast (dynamic anycast) Hi folks, We submitted two drafts about dyncast (dynamic anycast). draft-geng-rtgwg-cfn-dyncast-ps-usecase draft-li-rtgwg-cfn-dyncast-architecture Edge computing puts the potential requirements on better load balancing amo= ng the computing resources hosted on different edges. The number of such ed= ges could be thousand or even more depending on where the computing resourc= es are located. The expected approach is to consider both network status and computing reso= urces at the same time to determine the best place to forward a new computi= ng demand to. Current solution usually uses DNS-like approach, select the s= ervice instance first (the lowest load or roughly the geographically closes= t instance) and then direct the demand to it regardless how good or bad the= network path reaching it. Anycast based service addressing methodology could be used here to reach th= e best edge in terms of both computation resource and network status at the= same time. Flow affinity and computing aware routing needs to be enhanced = in such an anycast architecture. It is called dynamic anycast in the drafts= . If you have any comments or suggestions, please drop us an email. Appreciat= ed. Regards, Yizhou --_000_SN6PR13MB23340B6747554039B178957D85EF0SN6PR13MB2334namp_ Content-Type: text/html; charset="iso-2022-jp" Content-Transfer-Encoding: quoted-printable

Yi Zhou, Liang, Pen= g, and Peter,

 

We have 4 IETF draf= ts describing the different aspect of the solutions to 5G Edge computing, w= hich can cover your use cases and requirement described in draft-geng-rtgwg= -cfn-dyncast-ps-usecase:

 

Through working on = the 3GPP Release 17=1B$B!G=1B(Bs 5G Edge Computing project (3GPP TR23.748),= we noticed that IP Layer can do more to optimize the 5G Edge computing ser= vices.

 

https://datatracker.ietf.org/doc/draft-dunb= ar-ippm-5g-edge-compute-ip-layer-metrics/ describes the IP Layer metrics and methods to measure the Edge Computing S= ervers running status and environment for IP networks to select the optimal= Edge Computing server location in 5G Edge Computing (EC) environment. This= document also describes the method of incorporating those measurements with IP routing cost to come up with a= more optimal criteria in selecting ANYCAST locations.

 

https://datatracker.ietf.org/doc/draft-dunbar-6man-5g-edge-c= ompute-sticky-service/ describes a so= lution of using IPv6 extension header to help Ingre= ss router to stick traffic from a UE to the original App Server when the UE= moves from one 5G Site to another.

 

h= ttps://datatracker.ietf.org/doc/draft-dunbar-idr-5g-edge-compute-app-meta-d= ata/ describes a new BGP Network Layer Reachability Information (BGP NLRI) Path Attribute, AppMetaData, that can = distribute the 5G Edge Computing App running status and environment, so tha= t other routers in the 5G Local Data Network can make intelligent decision = on optimized forwarding of flows from UEs. The goal is to improve latency and performance for 5G Edge Compu= ting services. The extension enables a feature, called soft anchoring, whic= h makes one Edge Computing Server at one specific location to be more prefe= rred than others for the same application to receive packets from a specific source (UE).

 

https://datatracker.ietf.org/doc/draft-dunbar-lsr-5g-edge-compute-osp= f-ext/ describe OSPF extension for the Routers that collect the IP Layer Metrics = to propagate to all other routers.

 

Please let us know = if the proposed solutions can solve your use cases.

 

Thank you

Linda Dunbar

 

 

 

 =

Hi folks,

 

We submitted two drafts about dyncast (dynamic anyca= st).

 

draft-geng-rtgwg-cfn-dyncas= t-ps-usecase

draft-li-rtgwg-cfn-= dyncast-architecture

 

 

Edge computing puts the potential requirements on be= tter load balancing among the computing resources hosted on different edges= . The number of such edges could be thousand or even more depending on wher= e the computing resources are located.

The expected approach is to consider both network st= atus and computing resources at the same time to determine the best place t= o forward a new computing demand to. Current solution usually uses DNS-like= approach, select the service instance first (the lowest load or roughly the geographically closest instance) and= then direct the demand to it regardless how good or bad the network path r= eaching it.

 

Anycast based service addressing methodology could b= e used here to reach the best edge in terms of both computation resource an= d network status at the same time. Flow affinity and computing aware routin= g needs to be enhanced in such an anycast architecture. It is called dynamic anycast in the drafts.

 

If you have any comments or suggestions, please drop= us an email. Appreciated.

 

Regards,

Yizhou

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[73.63.232.212]) by smtp.gmail.com with ESMTPSA id t26sm3726271pfl.72.2020.11.04.15.16.00 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Wed, 04 Nov 2020 15:16:00 -0800 (PST) Date: Wed, 4 Nov 2020 15:15:33 -0800 From: Jeff Tantsura To: "Acee Lindem (acee)" , Yingzhen Qu , "=?utf-8?Q?lsr=40ietf.org?=" , "=?utf-8?Q?lsr-chairs=40ietf.org?=" , Linda Dunbar Message-ID: <9af88324-b117-4272-b21d-29002f9183fd@Spark> In-Reply-To: References: X-Readdle-Message-ID: 9af88324-b117-4272-b21d-29002f9183fd@Spark MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="5fa3362f_327b23c6_15868" Archived-At: Subject: Re: [Lsr] Question on using OSFPv2 extended Prefix TLV as the OSPF extension for 5G Edge Computing (was RE: IETF 109 LSR Presentation Slot Requests X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 04 Nov 2020 23:16:05 -0000 --5fa3362f_327b23c6_15868 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Content-Disposition: inline =46or OSP=46v3 use E-LSAs (R=46C8362) Cheers, Jeff On Nov 4, 2020, 2:44 PM -0800, Linda Dunbar , wrote: > Acee, > > Thank you very much for suggesting using the Prefix TLV for carry the R= unning Status and environment of 5G Edge Computing servers. > > In a nutshell, the=C2=A0https://datatracker.ietf.org/doc/draft-dunbar-l= sr-5g-edge-compute-ospf-ext/=C2=A0proposes the extension to LSA that can = carry the three SubTLVs that are used to represent the Running Status and= Environment information of the 5G Edge Computing Servers attached to the= router: > > =C2=A0=E2=80=A2=C2=A0Load measurement sub-TLV > =C2=A0=E2=80=A2=C2=A0Capacity Index=C2=A0=C2=A0Sub-TLV > =C2=A0=E2=80=A2=C2=A0Preference Index=C2=A0=C2=A0Sub-TLV > > Several sections of the draft are devoted to describe what those measur= ement are and why need them for 5G Edge Computing, which may have made it= not so straightforward when reading in a rush. > > The Goal of the OSP=46 extension is to carry those Sub-TLVs in the rout= er=E2=80=99s LSA to be advertised to other routers in the 5G Local Data N= etwork. > > If using your suggested R=46C7684 OSP=46v2 Extended Prefix TLV, the ext= ension does seem easier and cleaner: > > We can have: > =C2=A00 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > =7C Type=C2=A0=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=7C Length=C2=A0=C2=A0 =C2=A0 =C2=A0 =C2=A0= =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=7C > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > =7C Route Type=C2=A0=C2=A0 =C2=A0=7C Prefix Length =7C A=46=C2=A0=C2=A0= =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=7C =46lags=C2=A0 =C2=A0 =C2=A0 =C2=A0= =C2=A0=7C > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > =7C Address Prefix (variable)=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0=7C > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > =7C Load Measurement Sub-TLV=C2=A0=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0= =C2=A0 =C2=A0 =C2=A0=7C > =7E=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0= =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0= =C2=A0=7E > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > =7C capacity Index Sub-TLV=C2=A0=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0= =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0=7C > =7E=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0= =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0= =C2=A0=7E > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > =7C Site Preference Sub-TLV=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0= =C2=A0 =C2=A0 =C2=A0=7C > =7E=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0= =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0= =C2=A0=7E > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > > R=46C7684 only has the Extended Prefix TLV for IPv4. If the App Server = addresses are in IPv6, should we specify the extension to R=46C8362 in th= e same draft=3F Or define a new A=46 type for the same extension to R=46C= 7684=3F > > Your guidance is greatly appreciated. > > Thank you very much. > > Linda Dunbar > > > =46rom:=C2=A0Acee Lindem (acee) > Sent:=C2=A0Tuesday, November 3, 2020 1:38 PM > To:=C2=A0Linda Dunbar ; Yingzhen Qu ; lsr=40ietf.org; lsr-chairs=40ietf.org > Subject:=C2=A0Re: Need 10 minute slot to discuss OSP=46 extension for 5= G Edge Computing (was RE: =5BLsr=5D IET=46 109 LSR Presentation Slot Requ= ests > > We have a pretty full schedule and we add you as optional. I took a loo= k at the draft and it is all over the place right now with standardizatio= n requested for one solution but 3 separate solutions partially specified= . It could benefit from some WG mailing list discussion prior to a 10 min= ute presentation where we wouldn=E2=80=99t have time to discuss the many = issues. > > One major issue is that you should be extending R=46C 7684 rather than = R=46C 3630 and it seems you these app-server selection metrics should be = associated with a prefix and NOT a stub link (i.e., the application serve= r address). > > I=E2=80=99ll try to read it in more depth before IET=46 109. > > Thanks, > Acee > > =46rom:=C2=A0Linda Dunbar > Date:=C2=A0Monday, November 2, 2020 at 10:12 PM > To:=C2=A0Yingzhen Qu , =22lsr=40ietf.org=22 = , =22lsr-chairs=40ietf.org=22 > Subject:=C2=A0Need 10 minute slot to discuss OSP=46 extension for 5G Ed= ge Computing (was RE: =5BLsr=5D IET=46 109 LSR Presentation Slot Requests= > Resent-=46rom:=C2=A0 > Resent-To:=C2=A0Yingzhen Qu , Acee Lindem , Christian Hopps > Resent-Date:=C2=A0Monday, November 2, 2020 at 10:12 PM > > LSR Chairs, YingZhen, > > Can you give us 10 minute slot to present this new draft: > https://datatracker.ietf.org/doc/draft-dunbar-lsr-5g-edge-compute-ospf-= ext/ > > This draft describes an OSP=46 extension that can distribute the 5G Edg= e Computing App running status and environment, so that other routers in = the 5G Local Data Network can make intelligent decision on optimizing for= warding of flows from UEs. The goal is to improve latency and performance= for 5G Edge Computing services. > > Thank you very much, > > Linda Dunbar > > =46rom:=C2=A0Lsr =C2=A0On Behalf Of=C2=A0Yingzh= en Qu > Sent:=C2=A0Monday, October 19, 2020 3:52 PM > To:=C2=A0lsr=40ietf.org;=C2=A0lsr-chairs=40ietf.org > Subject:=C2=A0=5BLsr=5D IET=46 109 LSR Presentation Slot Requests > > Hi all, > > We're now accepting agenda requests for the LSR Working Grouping meetin= g IET=46 109. Please send your requests to=C2=A0lsr-chairs=40ietf.org=C2=A0= indicating draft name, speaker, and desired duration (covering presentati= on and discussion). > > LSR session is scheduled on Monday, Nov 16, 12:00-14:00 ICT. > > Thanks, > Yingzhen > =5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F= =5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F > Lsr mailing list > Lsr=40ietf.org > https://www.ietf.org/mailman/listinfo/lsr --5fa3362f_327b23c6_15868 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable Content-Disposition: inline
=46or OSP=46v3 use E-LSAs (R=46C8362)

Cheers,
Jeff
On Nov 4, 2020, 2:44 PM -0800, Linda Dunbar <lin= da.dunbar=40futurewei.com>, wrote:
Acee,
&=23160;
Thank you very much for suggesting using the Prefix TLV for c= arry the Running Status and environment of 5G Edge Computing servers.
&=23160;
In a nutshell, the&=23160;https://datatracker.= ietf.org/doc/draft-dunbar-lsr-5g-edge-compute-ospf-ext/&=23160;proposes the extension to LSA that = can carry the three SubTLVs that are used to represent the Running Status= and Environment information of the 5G Edge Computing Servers attached to= the router:
&=23160;
&=23160;=E2=80=A2&=23160;Load measurement sub-TLV&=23160;
&=23160;=E2=80=A2&=23160;Capacity Index&=23160;&=23160;Sub-TL= V&=23160;&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &= =23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;
&=23160;=E2=80=A2&=23160;Preference Index&=23160;&=23160;Sub-= TLV&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160= ; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;= &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; = &=23160; &=23160;
&=23160;
Several sections of the draft are devoted to describe what th= ose measurement are and why need them for 5G Edge Computing, which may ha= ve made it not so straightforward when reading in a rush.
&=23160;
The Goal of the OSP=46 extension is to carry those Sub-TLVs i= n the router=E2=80=99s LSA to be advertised to other routers in the 5G Lo= cal Data Network.
&=23160;
If using your suggested R=46C7684 OSP=46v2 Extended Prefix TL= V, the extension does seem easier and cleaner:
&=23160;
We can have:
&=23160;0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8= 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+= -+-+-+-+-+-+-+-+-+-+
=7C Type&=23160;&=23160; &=23160; &=23160; &=23= 160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=231= 60; &=23160;=7C Length&=23160;&=23160; &=23160; &=23160; &=23160; &=23160= ; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;=7C
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+= -+-+-+-+-+-+-+-+-+-+
=7C Route Type&=23160;&=23160; &=23160;=7C Pr= efix Length =7C A=46&=23160;&=23160; &=23160; &=23160; &=23160; &=23160; = &=23160;=7C =46lags&=23160; &=23160; &=23160; &=23160; &=23160;=7C=
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+= -+-+-+-+-+-+-+-+-+-+
=7C Address Prefix (variable)&=23160; &=23160= ; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;= &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; = &=23160;=7C
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+= -+-+-+-+-+-+-+-+-+-+&=23160;&=23160;
=7C Load Measurement Sub-TLV&=23160;&=23160; = &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &= =23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23= 160; &=23160;=7C
=7E&=23160; &=23160; &=23160; &=23160; &=2316= 0; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160= ; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;= &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; = &=23160; &=23160; &=23160;=7E
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+= -+-+-+-+-+-+-+-+-+-+&=23160;&=23160;
=7C capacity Index Sub-TLV&=23160;&=23160; &=23= 160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=231= 60; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=2316= 0; &=23160; &=23160;=7C
=7E&=23160; &=23160; &=23160; &=23160; &=2316= 0; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160= ; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;= &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; = &=23160; &=23160; &=23160;=7E
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+= -+-+-+-+-+-+-+-+-+-+&=23160;&=23160;
=7C Site Preference Sub-TLV&=23160; &=23160; = &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &= =23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23= 160; &=23160;=7C
=7E&=23160; &=23160; &=23160; &=23160; &=2316= 0; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160= ; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;= &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; = &=23160; &=23160; &=23160;=7E&=23160;&=23160;
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+= -+-+-+-+-+-+-+-+-+-+&=23160;&=23160;
&=23160;
&=23160;
R=46C7684 only has the Extended Prefix TLV for IPv4. If the A= pp Server addresses are in IPv6, should we specify the extension to R=46C= 8362 in the same draft=3F Or define a new A=46 type for the same extensio= n to R=46C7684=3F
&=23160;
Your guidance is greatly appreciated.
&=23160;
Thank you very much.
&=23160;
Linda Dunbar
&=23160;
&=23160;
=46rom:&=23160;= Acee Lindem (acee) <acee=40cisco.com>
Sent:&=23160;Tu= esday, November 3, 2020 1:38 PM
To:&=23160;Lind= a Dunbar <linda.dunbar=40futurewei.com>; Yingzhen Qu <yingzhen.i= etf=40gmail.com>; lsr=40ietf.org; lsr-chairs=40ietf.org
Subject:&=23160= ;Re: Need 10 minute slot to discuss OSP=46 extension for 5G Edge Computin= g (was RE: =5BLsr=5D IET=46 109 LSR Presentation Slot Requests
&=23160;
We have a pretty full schedule a= nd we add you as optional. I took a look at the draft and it is all over = the place right now with standardization requested for one solution but 3= separate solutions partially specified. It could benefit from some WG ma= iling list discussion prior to a 10 minute presentation where we wouldn=E2= =80=99t have time to discuss the many issues.
&=23160;
One major issue is that you shou= ld be extending R=46C 7684 rather than R=46C 3630 and it seems you these = app-server selection metrics should be associated with a prefix and NOT a= stub link (i.e., the application server address).
&=23160;
I=E2=80=99ll try to read it in m= ore depth before IET=46 109.
&=23160;
Thanks,
Acee
&=23160;
=46rom:&=23160;Linda Dunbar <linda.dunbar=40futurewei.com>
Date:&=23160;Monday, November 2, 2020 at 10:12 PM
To:&=23160;Yingzhen Qu <yingzhe= n.ietf=40gmail.com>= ;, =22lsr=40ietf.org=22 <lsr=40ietf.org= >, =22lsr-chairs=40ietf.org=22 <lsr-chairs=40= ietf.org>
Subject:&=23160;Need 10 minute slot to discuss OSP=46 extension for 5G = Edge Computing (was RE: =5BLsr=5D IET=46 109 LSR Presentation Slot Reques= ts
Resent-=46rom:&=23160;<alias-bounc= es=40ietf.org>
Resent-To:&=23160;Yingzhen Qu <yi= ngzhen.ietf=40gmail.com>, Acee Lindem <acee=40cisco.com>, Christian Hopps <<= /span>chopps=40chopps.org>
Resent-Date:&=23160;Monday, November 2, 2020 at 10:12 PM
&=23160;
LSR Chairs, YingZhen,
&=23160;
Can you give us 10 minute slot t= o present this new draft:
https://data= tracker.ietf.org/doc/draft-dunbar-lsr-5g-edge-compute-ospf-ext/
&=23160;
This draft describes an OSP=46 e= xtension that can distribute the 5G Edge Computing App running status and= environment, so that other routers in the 5G Local Data Network can make= intelligent decision on optimizing forwarding of flows from UEs. The goa= l is to improve latency and performance for 5G Edge Computing services.
&=23160;
Thank you very much,
&=23160;
Linda Dunbar
&=23160;
=46rom:&=23160;= Lsr <lsr-bounces=40ietf.org>&=23160;On Behalf Of&= =23160;Yingzhen Qu
Sent:&=23160;Mo= nday, October 19, 2020 3:52 PM
To:&=23160;lsr=40ietf.org<= /a>;&=23160;lsr-chairs=40ietf.org
Subject:&=23160= ;=5BLsr=5D IET=46 109 LSR Presentation Slot Requests
&=23160;
= Hi all,&=23160;
= &=23160;
We're now accepting agenda requests fo= r the LSR Working Grouping meeting IET=46 109. Please send your requests = to&=23160;lsr-chairs=40= ietf.org&=23160;indicating draft name, speaker, and desired duration (cover= ing presentation and discussion).&=23160;
&=23160;
LSR session is scheduled on Monday, No= v 16, 12:00-14:00 ICT.
&=23160;
Thanks,
Yingzhen
=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F= =5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F= =5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F
Lsr mailing list
Lsr=40ietf.org
https://www.ietf.org/mailman/lis= tinfo/lsr
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15.20.3499.032; Thu, 5 Nov 2020 00:42:29 +0000 From: "Acee Lindem (acee)" To: Jeff Tantsura , Yingzhen Qu , "lsr@ietf.org" , "lsr-chairs@ietf.org" , Linda Dunbar Thread-Topic: [Lsr] Question on using OSFPv2 extended Prefix TLV as the OSPF extension for 5G Edge Computing (was RE: IETF 109 LSR Presentation Slot Requests Thread-Index: AQHWswCAyfYk7QnajE6wfGbbd5+xiKm4Xz6A Date: Thu, 5 Nov 2020 00:42:28 +0000 Message-ID: <75281559-0A10-4F81-B358-AAE2CBA0DE2B@cisco.com> References: <9af88324-b117-4272-b21d-29002f9183fd@Spark> In-Reply-To: <9af88324-b117-4272-b21d-29002f9183fd@Spark> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: user-agent: Microsoft-MacOutlook/16.42.20101102 authentication-results: gmail.com; dkim=none (message not signed) header.d=none;gmail.com; dmarc=none action=none header.from=cisco.com; x-originating-ip: [136.56.133.70] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: bf4be469-089d-4300-c42d-08d88123acb3 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bf4be469-089d-4300-c42d-08d88123acb3 X-MS-Exchange-CrossTenant-originalarrivaltime: 05 Nov 2020 00:42:29.3746 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 5ae1af62-9505-4097-a69a-c1553ef7840e X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: ZgvTQpd4ogtrIzR4iG5oc8QKoN61Udg53jUNp+Qc8uLBpLjWjzRpSLMr13avAVLh X-MS-Exchange-Transport-CrossTenantHeadersStamped: BY5PR11MB3880 X-OriginatorOrg: cisco.com X-Outbound-SMTP-Client: 173.36.7.13, xch-aln-003.cisco.com X-Outbound-Node: alln-core-11.cisco.com Archived-At: Subject: Re: [Lsr] Question on using OSFPv2 extended Prefix TLV as the OSPF extension for 5G Edge Computing (was RE: IETF 109 LSR Presentation Slot Requests X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 05 Nov 2020 00:42:36 -0000 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--_000_752815590A104F81B358AAE2CBA0DE2Bciscocom_-- From nobody Wed Nov 4 17:15:47 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 870433A121F for ; Wed, 4 Nov 2020 17:15:45 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.899 X-Spam-Level: X-Spam-Status: No, score=-1.899 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id oQ23O_jYpJvR for ; Wed, 4 Nov 2020 17:15:42 -0800 (PST) Received: from mail-m127101.qiye.163.com (mail-m127101.qiye.163.com [115.236.127.101]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 483D43A1214 for ; Wed, 4 Nov 2020 17:15:41 -0800 (PST) Received: from DESKTOP2IOH5QC (unknown [219.142.69.75]) by mail-m127101.qiye.163.com (Hmail) with ESMTPA id A923447459; Thu, 5 Nov 2020 09:15:37 +0800 (CST) From: "Aijun Wang" To: "'Acee Lindem \(acee\)'" , "'Aijun Wang'" Cc: "'Peter Psenak \(ppsenak\)'" , References: <32E90101-724C-4B38-8F11-7CF552B4F926@chinatelecom.cn> <33AEF7BB-F6C4-430F-966D-1AC5CE3266B4@cisco.com> In-Reply-To: Date: Thu, 5 Nov 2020 09:15:36 +0800 Message-ID: <015801d6b311$2b1990c0$814cb240$@tsinghua.org.cn> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-Mailer: Microsoft Outlook 16.0 Thread-Index: AQHBcZKtnN6H519STWFh4ttSE8lVhAKe8FwxAOQmWlmpxyRHUA== Content-Language: zh-cn X-HM-Spam-Status: e1kfGhgUHx5ZQUtXWQgYFAkeWUFZS1VLWVdZKFlBSkxLS0o3V1ktWUFJV1 kPCRoVCBIfWUFZGkNPGEMdQ0lJTk0ZVkpNS09OSENCSExCSEJVEwETFhoSFyQUDg9ZV1kWGg8SFR 0UWUFZT0tIVUpKS0hPQ1VLWQY+ X-HM-Sender-Digest: e1kMHhlZQR0aFwgeV1kSHx4VD1lBWUc6NjY6Ezo6NT8pSh8SIj4QFEwP MTcKFC5VSlVKTUtPTkhDQkhDSENMVTMWGhIXVQwaFRwaEhEOFTsPCBIVHBMOGlUUCRxVGBVFWVdZ EgtZQVlJSkJVSk9JVU1CVUxOWVdZCAFZQU9PT0o3Bg++ X-HM-Tid: 0a7595f931f49865kuuua923447459 Archived-At: Subject: Re: [Lsr] FW: New Version Notification for draft-wang-lsr-passive-interface-attribute-04.txt X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 05 Nov 2020 01:15:46 -0000 Hi, Acee: Thanks for this comments. The consideration for the position of flagging the passive interface = have been stated in the updated 05 version = https://tools.ietf.org/html/draft-wang-lsr-passive-interface-attribute-05= #section-3, as the followings: ISIS [RFC5029] defines the Link-Attributes Sub-TLV to carry the link attribute information, but this Sub-TLV can only be carried within the TLV 22, which is used to described the attached neighbor. For passive interface, there is no ISIS neighbor, then it is not appropriate to use this Sub-TLV to indicate the passive attribute of the interface. OSPFv2[RFC2328] defines link type field within Router LSA, the type 3 for connections to a stub network can be used to identified the passive interface. But in OSPFv3 [RFC5340], type 3 within the Router-LSA has been reserved. The information that associated with stub network has been put in the Intra-Area-Prefix-LSAs. What about your opinions regarding to the above statements? Currently, = we think putting the flag within the prefix attribute that associated = the passive interface is appropriate. If we can find other appropriate/acceptable place to hold this = information, we can also update the draft later accordingly. Best Regards Aijun Wang China Telecom -----Original Message----- From: Acee Lindem (acee) [mailto:acee@cisco.com]=20 Sent: Thursday, November 5, 2020 4:11 AM To: Aijun Wang Cc: Aijun Wang ; Peter Psenak (ppsenak) = ; lsr@ietf.org Subject: Re: [Lsr] FW: New Version Notification for = draft-wang-lsr-passive-interface-attribute-04.txt Hi Aijun, You still didn't answer the question as to why you didn't rework this = draft for passive interface to be an interface attribute rather than a = prefix attribute?=20 Thanks, Acee =EF=BB=BFOn 10/1/20, 6:13 AM, "Acee Lindem (acee)" = wrote: Hi Aijun,=20 You didn't answer my question and pruned my message. Other than your = attempt to expose the topology of areas outside the area, there is no = other reason to associate the passive interface attribute with a prefix. = We seem to be in a circular discussion....=20 Acee On 9/30/20, 10:43 PM, "wangaj3@chinatelecom.cn on behalf of Aijun = Wang" wrote: Hi, Acee: Except the corner cases of unnumbered interface, would you like = to illustrate other scenarios that the process does not apply? As mentioned in last mail, knowing the passive interfaces can = assist the nodes or controller know the boundaries of the network. Aijun Wang China Telecom > On Sep 30, 2020, at 19:47, Acee Lindem (acee) = wrote: >=20 From nobody Wed Nov 4 18:02:40 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B356B3A1269; Wed, 4 Nov 2020 18:02:38 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.798 X-Spam-Level: X-Spam-Status: No, score=-1.798 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, HTTPS_HTTP_MISMATCH=0.1, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=no autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id MYtGALFI2XnF; Wed, 4 Nov 2020 18:02:36 -0800 (PST) Received: from mail-m127101.qiye.163.com (mail-m127101.qiye.163.com [115.236.127.101]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 5D5313A1266; Wed, 4 Nov 2020 18:02:34 -0800 (PST) Received: from DESKTOP2IOH5QC (unknown [219.142.69.75]) by mail-m127101.qiye.163.com (Hmail) with ESMTPA id 0B032474B8; Thu, 5 Nov 2020 10:02:31 +0800 (CST) From: "Aijun Wang" To: "'Linda Dunbar'" , "'Acee Lindem \(acee\)'" , "'Yingzhen Qu'" , , References: In-Reply-To: Date: Thu, 5 Nov 2020 10:02:30 +0800 Message-ID: <016301d6b317$b7fd7870$27f86950$@tsinghua.org.cn> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0164_01D6B35A.C626FA00" X-Mailer: Microsoft Outlook 16.0 Thread-Index: AQD2J7U/Llv21jdkogB4O2EIjUtqHat53eVA Content-Language: zh-cn X-HM-Spam-Status: e1kfGhgUHx5ZQUtXWQgYFAkeWUFZS1VLWVdZKFlBSkxLS0o3V1ktWUFJV1 kPCRoVCBIfWUFZGhpLTU9LSUsfS0oaVkpNS09OT0pMTkpIT09VEwETFhoSFyQUDg9ZV1kWGg8SFR 0UWUFZT0tIVUpKS0hPQ1VLWQY+ X-HM-Sender-Digest: e1kMHhlZQR0aFwgeV1kSHx4VD1lBWUc6PBA6Hzo6PD8hPx8uNy9PPj48 MBxPCzVVSlVKTUtPTk9KTE5KQ0xMVTMWGhIXVQwaFRwaEhEOFTsPCBIVHBMOGlUUCRxVGBVFWVdZ EgtZQVlJSkJVSk9JVU1CVUxOWVdZCAFZQU9JTktONwY+ X-HM-Tid: 0a7596241fa49865kuuu0b032474b8 Archived-At: Subject: Re: [Lsr] Question on using OSFPv2 extended Prefix TLV as the OSPF extension for 5G Edge Computing (was RE: IETF 109 LSR Presentation Slot Requests X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 05 Nov 2020 02:02:39 -0000 This is a multipart message in MIME format. ------=_NextPart_000_0164_01D6B35A.C626FA00 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Hi, Linda: =20 Is it better to add some analysis for the flooding influences on the = router performance when we add such dynamic information within the IGP = protocol? =20 =20 Best Regards =20 Aijun Wang China Telecom =20 From: lsr-bounces@ietf.org [mailto:lsr-bounces@ietf.org] On Behalf Of = Linda Dunbar Sent: Thursday, November 5, 2020 6:44 AM To: Acee Lindem (acee) ; Yingzhen Qu = ; lsr@ietf.org; lsr-chairs@ietf.org Subject: [Lsr] Question on using OSFPv2 extended Prefix TLV as the OSPF = extension for 5G Edge Computing (was RE: IETF 109 LSR Presentation Slot = Requests =20 Acee,=20 =20 Thank you very much for suggesting using the Prefix TLV for carry the = Running Status and environment of 5G Edge Computing servers.=20 =20 In a nutshell, the = https://datatracker.ietf.org/doc/draft-dunbar-lsr-5g-edge-compute-ospf-ex= t/ proposes the extension to LSA that can carry the three SubTLVs that = are used to represent the Running Status and Environment information of = the 5G Edge Computing Servers attached to the router: =20 =C3=98 Load measurement sub-TLV =20 =C3=98 Capacity Index Sub-TLV =20 =C3=98 Preference Index Sub-TLV = =20 =20 Several sections of the draft are devoted to describe what those = measurement are and why need them for 5G Edge Computing, which may have = made it not so straightforward when reading in a rush.=20 =20 The Goal of the OSPF extension is to carry those Sub-TLVs in the = router=E2=80=99s LSA to be advertised to other routers in the 5G Local = Data Network.=20 =20 If using your suggested RFC7684 OSPFv2 Extended Prefix TLV, the = extension does seem easier and cleaner:=20 =20 We can have:=20 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Type | Length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Route Type | Prefix Length | AF | Flags | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Address Prefix (variable) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ =20 | Load Measurement Sub-TLV |=20 ~ ~=20 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ =20 | capacity Index Sub-TLV |=20 ~ ~=20 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ =20 | Site Preference Sub-TLV |=20 ~ ~ =20 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ =20 =20 =20 RFC7684 only has the Extended Prefix TLV for IPv4. If the App Server = addresses are in IPv6, should we specify the extension to RFC8362 in the = same draft? Or define a new AF type for the same extension to RFC7684?=20 =20 Your guidance is greatly appreciated.=20 =20 Thank you very much.=20 =20 Linda Dunbar =20 =20 From: Acee Lindem (acee) >=20 Sent: Tuesday, November 3, 2020 1:38 PM To: Linda Dunbar >; Yingzhen Qu = >; = lsr@ietf.org ; lsr-chairs@ietf.org = =20 Subject: Re: Need 10 minute slot to discuss OSPF extension for 5G Edge = Computing (was RE: [Lsr] IETF 109 LSR Presentation Slot Requests =20 We have a pretty full schedule and we add you as optional. I took a look = at the draft and it is all over the place right now with standardization = requested for one solution but 3 separate solutions partially specified. = It could benefit from some WG mailing list discussion prior to a 10 = minute presentation where we wouldn=E2=80=99t have time to discuss the = many issues.=20 =20 One major issue is that you should be extending RFC 7684 rather than RFC = 3630 and it seems you these app-server selection metrics should be = associated with a prefix and NOT a stub link (i.e., the application = server address). =20 I=E2=80=99ll try to read it in more depth before IETF 109.=20 =20 Thanks, Acee =20 From: Linda Dunbar > Date: Monday, November 2, 2020 at 10:12 PM To: Yingzhen Qu >, "lsr@ietf.org = " >, "lsr-chairs@ietf.org = " > Subject: Need 10 minute slot to discuss OSPF extension for 5G Edge = Computing (was RE: [Lsr] IETF 109 LSR Presentation Slot Requests Resent-From: > Resent-To: Yingzhen Qu >, Acee Lindem >, Christian Hopps > Resent-Date: Monday, November 2, 2020 at 10:12 PM =20 LSR Chairs, YingZhen,=20 =20 Can you give us 10 minute slot to present this new draft: https://datatracker.ietf.org/doc/draft-dunbar-lsr-5g-edge-compute-ospf-ex= t/ = =20 =20 This draft describes an OSPF extension that can distribute the 5G Edge = Computing App running status and environment, so that other routers in = the 5G Local Data Network can make intelligent decision on optimizing = forwarding of flows from UEs. The goal is to improve latency and = performance for 5G Edge Computing services.=20 =20 Thank you very much,=20 =20 Linda Dunbar =20 From: Lsr > On = Behalf Of Yingzhen Qu Sent: Monday, October 19, 2020 3:52 PM To: lsr@ietf.org ; lsr-chairs@ietf.org = =20 Subject: [Lsr] IETF 109 LSR Presentation Slot Requests =20 Hi all,=20 =20 We're now accepting agenda requests for the LSR Working Grouping meeting = IETF 109. Please send your requests to = lsr-chairs@ietf.org indicating draft name, speaker, and desired duration = (covering presentation and discussion).=20 =20 LSR session is scheduled on Monday, Nov 16, 12:00-14:00 ICT. =20 Thanks, Yingzhen ------=_NextPart_000_0164_01D6B35A.C626FA00 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable

H= i, Linda:

<= o:p> 

I= s it better to add some analysis for the flooding influences on the = router performance when we add such dynamic information within the IGP = protocol?

<= o:p> 

<= o:p> 

B= est Regards

<= o:p> 

A= ijun Wang

C= hina Telecom<= o:p>

<= o:p> 

From: lsr-bounces@ietf.org = [mailto:lsr-bounces@ietf.org] On Behalf Of Linda = Dunbar
Sent: Thursday, November 5, 2020 6:44 AM
To: = Acee Lindem (acee) <acee@cisco.com>; Yingzhen Qu = <yingzhen.ietf@gmail.com>; lsr@ietf.org; = lsr-chairs@ietf.org
Subject: [Lsr] Question on using OSFPv2 = extended Prefix TLV as the OSPF extension for 5G Edge Computing (was RE: = IETF 109 LSR Presentation Slot = Requests

 

Acee, =

 

Thank you very much for = suggesting using the Prefix TLV for carry the Running Status and = environment of 5G Edge Computing servers.

 

In a nutshell, the https://datatracker.ietf.org/doc/draft-dunbar-lsr-5g-edge-com= pute-ospf-ext/ proposes the extension to LSA that can carry the = three SubTLVs that are used to represent the Running Status and = Environment information of the 5G Edge Computing Servers attached to the = router:

 

=C3=98  Load measurement sub-TLV  =

=C3=98  Capacity Index =  Sub-TLV          =             &= nbsp;     

=C3=98  Preference Index  = Sub-TLV           =             &= nbsp;  =             &= nbsp;           &n= bsp;

 

Several sections of the = draft are devoted to describe what those measurement are and why need = them for 5G Edge Computing, which may have made it not so = straightforward when reading in a rush.

 

The Goal of the OSPF = extension is to carry those Sub-TLVs in the router=E2=80=99s LSA to be = advertised to other routers in the 5G Local Data Network. =

 

If using your suggested = RFC7684 OSPFv2 Extended Prefix TLV, the extension does seem easier and = cleaner:

 

We can have: =

 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 = 0 1

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

| = Type           &nb= sp;           &nbs= p;  | Length =             &= nbsp;          |

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

| Route Type    | Prefix Length | AF =            | = Flags        =  |

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

| Address Prefix (variable) =             &= nbsp;           &n= bsp;           |

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+&n= bsp; 

| Load = Measurement = Sub-TLV           =             &= nbsp;           &n= bsp;  |

~           =             &= nbsp;           &n= bsp;           &nb= sp;           &nbs= p;   ~

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+&n= bsp; 

| = capacity Index = Sub-TLV           =      =             &= nbsp;           | =

~           =             &= nbsp;           &n= bsp;           &nb= sp;           &nbs= p;   ~

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+&n= bsp; 

| Site = Preference = Sub-TLV           =   =             &= nbsp;           &n= bsp; |

~           =             &= nbsp;           &n= bsp;           &nb= sp;           &nbs= p;   ~  

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+&n= bsp; 

 

 

RFC7684 only has the = Extended Prefix TLV for IPv4. If the App Server addresses are in IPv6, = should we specify the extension to RFC8362 in the same draft? Or define = a new AF type for the same extension to RFC7684? =

 

Your guidance is = greatly appreciated.

 

Thank you very much. =

 

Linda = Dunbar

 

 

From: Acee Lindem (acee) = <acee@cisco.com> =
Sent: Tuesday, November 3, 2020 1:38 PM
To: Linda = Dunbar <linda.dunbar@futurewei.com= >; Yingzhen Qu <yingzhen.ietf@gmail.com>; = lsr@ietf.org; lsr-chairs@ietf.org
Subject= : Re: Need 10 minute slot to discuss OSPF extension for 5G Edge = Computing (was RE: [Lsr] IETF 109 LSR Presentation Slot = Requests

 

We have a pretty full schedule and we add you as optional. = I took a look at the draft and it is all over the place right now with = standardization requested for one solution but 3 separate solutions = partially specified. It could benefit from some WG mailing list = discussion prior to a 10 minute presentation where we wouldn=E2=80=99t = have time to discuss the many issues.

 

One major issue is that you should be extending RFC 7684 = rather than RFC 3630 and it seems you these app-server selection metrics = should be associated with a prefix and NOT a stub link (i.e., the = application server address).

 

I=E2=80=99ll try to read it in more depth before IETF 109. =

 

Thanks,
Acee

 

From: = Linda Dunbar <linda.dunbar@futurewei.com= >
Date: Monday, November 2, 2020 at 10:12 PM
To: = Yingzhen Qu <yingzhen.ietf@gmail.com>, = "lsr@ietf.org" <lsr@ietf.org>, "lsr-chairs@ietf.org" <lsr-chairs@ietf.org>
Sub= ject: Need 10 minute slot to discuss OSPF extension for 5G Edge = Computing (was RE: [Lsr] IETF 109 LSR Presentation Slot = Requests
Resent-From: <alias-bounces@ietf.org>
= Resent-To: Yingzhen Qu <yingzhen.ietf@gmail.com>, = Acee Lindem <acee@cisco.com>, Christian Hopps = <chopps@chopps.org>
Resent-= Date: Monday, November 2, 2020 at 10:12 = PM

 

LSR Chairs, YingZhen,

 

Can you give us 10 minute slot to present this new = draft:

https://datatracker.ietf.org/= doc/draft-dunbar-lsr-5g-edge-compute-ospf-ext/

<= p class=3DMsoNormal = style=3D'margin-left:57.0pt;mso-para-margin-left:5.18gd'> 

This draft describes = an OSPF extension that can distribute the 5G = Edge Computing App running status and environment, so that other routers = in the 5G Local Data Network can make intelligent decision on optimizing = forwarding of flows from UEs. The goal is to improve latency and = performance for 5G Edge Computing services.

 

Thank you very much,

 

Linda Dunbar

 

From: Lsr <lsr-bounces@ietf.org> On = Behalf Of Yingzhen Qu
Sent: Monday, October 19, 2020 3:52 = PM
To: lsr@ietf.org; lsr-chairs@ietf.org
Subject= : [Lsr] IETF 109 LSR Presentation Slot = Requests

 

Hi all, 

 

We're now accepting agenda requests for the = LSR Working Grouping meeting IETF 109. Please send your requests = to lsr-chairs@ietf.org indicating = draft name, speaker, and desired duration (covering presentation and = discussion). 

 

LSR session is scheduled on Monday, Nov 16, = 12:00-14:00 ICT.

 

Thanks,

Yingzhen

------=_NextPart_000_0164_01D6B35A.C626FA00-- From nobody Thu Nov 5 00:26:04 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0F28A3A0CED for ; Thu, 5 Nov 2020 00:26:02 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -9.848 X-Spam-Level: X-Spam-Status: No, score=-9.848 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, NICE_REPLY_A=-0.247, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id wKm-TwylYjkW for ; Thu, 5 Nov 2020 00:25:57 -0800 (PST) Received: from aer-iport-3.cisco.com (aer-iport-3.cisco.com [173.38.203.53]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id EEAC83A0C8B for ; Thu, 5 Nov 2020 00:25:56 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=3263; q=dns/txt; s=iport; t=1604564757; x=1605774357; h=subject:to:cc:references:from:message-id:date: mime-version:in-reply-to:content-transfer-encoding; bh=i9W2MQDtXYsewCrOBl6WbFDz3EQ9Bd12MgVNXeGA9RM=; b=PUy6llNq0uVzhAGOtmmVKwglWlUIA7Fi0c17iYlmfr1810Fpbczv+zAy N74zcy3oIc0wP/sSmjj0mvaWQiUFUmIKB3M0H3b9wcsoVOu9xR8sbL+au ByhdD0LKj4X4WSQfAgix3Lato2Lqbg/oIfMQ4dJ5ML/V8jPcltRNZD/JD U=; X-IronPort-AV: E=Sophos;i="5.77,453,1596499200"; d="scan'208";a="28445581" Received: from aer-iport-nat.cisco.com (HELO aer-core-2.cisco.com) ([173.38.203.22]) by aer-iport-3.cisco.com with ESMTP/TLS/DHE-RSA-SEED-SHA; 05 Nov 2020 08:25:55 +0000 Received: from [10.60.140.51] (ams-ppsenak-nitro2.cisco.com [10.60.140.51]) by aer-core-2.cisco.com (8.15.2/8.15.2) with ESMTP id 0A58Ps4t028926; Thu, 5 Nov 2020 08:25:55 GMT To: Aijun Wang , "'Acee Lindem (acee)'" , "'Aijun Wang'" Cc: lsr@ietf.org References: <32E90101-724C-4B38-8F11-7CF552B4F926@chinatelecom.cn> <33AEF7BB-F6C4-430F-966D-1AC5CE3266B4@cisco.com> <015801d6b311$2b1990c0$814cb240$@tsinghua.org.cn> From: Peter Psenak Message-ID: Date: Thu, 5 Nov 2020 09:25:54 +0100 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: <015801d6b311$2b1990c0$814cb240$@tsinghua.org.cn> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Outbound-SMTP-Client: 10.60.140.51, ams-ppsenak-nitro2.cisco.com X-Outbound-Node: aer-core-2.cisco.com Archived-At: Subject: Re: [Lsr] FW: New Version Notification for draft-wang-lsr-passive-interface-attribute-04.txt X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 05 Nov 2020 08:26:02 -0000 Hi Aijun, please look at rfc5316, ISIS already have a way to advertise inter-AS link without forming an adjacency. thanks, Peter On 05/11/2020 02:15, Aijun Wang wrote: > Hi, Acee: > > Thanks for this comments. > The consideration for the position of flagging the passive interface have been stated in the updated 05 version https://tools.ietf.org/html/draft-wang-lsr-passive-interface-attribute-05#section-3, as the followings: > > ISIS [RFC5029] defines the Link-Attributes Sub-TLV to carry the link > attribute information, but this Sub-TLV can only be carried within > the TLV 22, which is used to described the attached neighbor. For > passive interface, there is no ISIS neighbor, then it is not > appropriate to use this Sub-TLV to indicate the passive attribute of > the interface. > > OSPFv2[RFC2328] defines link type field within Router LSA, the type 3 > for connections to a stub network can be used to identified the > passive interface. But in OSPFv3 [RFC5340], type 3 within the > Router-LSA has been reserved. The information that associated with > stub network has been put in the Intra-Area-Prefix-LSAs. > > What about your opinions regarding to the above statements? Currently, we think putting the flag within the prefix attribute that associated the passive interface is appropriate. > If we can find other appropriate/acceptable place to hold this information, we can also update the draft later accordingly. > > > Best Regards > > Aijun Wang > China Telecom > > > -----Original Message----- > From: Acee Lindem (acee) [mailto:acee@cisco.com] > Sent: Thursday, November 5, 2020 4:11 AM > To: Aijun Wang > Cc: Aijun Wang ; Peter Psenak (ppsenak) ; lsr@ietf.org > Subject: Re: [Lsr] FW: New Version Notification for draft-wang-lsr-passive-interface-attribute-04.txt > > Hi Aijun, > You still didn't answer the question as to why you didn't rework this draft for passive interface to be an interface attribute rather than a prefix attribute? > Thanks, > Acee > > On 10/1/20, 6:13 AM, "Acee Lindem (acee)" wrote: > > Hi Aijun, > You didn't answer my question and pruned my message. Other than your attempt to expose the topology of areas outside the area, there is no other reason to associate the passive interface attribute with a prefix. We seem to be in a circular discussion.... > Acee > > On 9/30/20, 10:43 PM, "wangaj3@chinatelecom.cn on behalf of Aijun Wang" wrote: > > Hi, Acee: > Except the corner cases of unnumbered interface, would you like to illustrate other scenarios that the process does not apply? > As mentioned in last mail, knowing the passive interfaces can assist the nodes or controller know the boundaries of the network. > > Aijun Wang > China Telecom > > > On Sep 30, 2020, at 19:47, Acee Lindem (acee) wrote: > > > > > > > _______________________________________________ > Lsr mailing list > Lsr@ietf.org > https://www.ietf.org/mailman/listinfo/lsr > > From nobody Thu Nov 5 01:09:31 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 61DBB3A103D for ; Thu, 5 Nov 2020 01:09:29 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.9 X-Spam-Level: X-Spam-Status: No, score=-1.9 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id BiZtijGf-bDo for ; Thu, 5 Nov 2020 01:09:26 -0800 (PST) Received: from chinatelecom.cn (prt-mail.chinatelecom.cn [42.123.76.230]) by ietfa.amsl.com (Postfix) with ESMTP id 9524E3A0EBD for ; Thu, 5 Nov 2020 01:09:25 -0800 (PST) HMM_SOURCE_IP: 172.18.0.92:29355.1417079803 HMM_ATTACHE_NUM: 0000 HMM_SOURCE_TYPE: SMTP Received: from clientip-219.142.69.75?logid-01bfd7bede254840a2fdbc498f84584f (unknown [172.18.0.92]) by chinatelecom.cn (HERMES) with SMTP id 1E5B3280090; Thu, 5 Nov 2020 17:09:16 +0800 (CST) X-189-SAVE-TO-SEND: 66040164@chinatelecom.cn Received: from ([172.18.0.92]) by App0021 with ESMTP id 01bfd7bede254840a2fdbc498f84584f for acee@cisco.com; Thu Nov 5 17:09:23 2020 X-Transaction-ID: 01bfd7bede254840a2fdbc498f84584f X-filter-score: filter<0> X-Real-From: wangaj3@chinatelecom.cn X-Receive-IP: 172.18.0.92 X-MEDUSA-Status: 0 Sender: wangaj3@chinatelecom.cn From: "Aijun Wang" To: , "'Aijun Wang'" , "'Acee Lindem \(acee\)'" Cc: References: <32E90101-724C-4B38-8F11-7CF552B4F926@chinatelecom.cn> <33AEF7BB-F6C4-430F-966D-1AC5CE3266B4@cisco.com> <015801d6b311$2b1990c0$814cb240$@tsinghua.org.cn> In-Reply-To: Date: Thu, 5 Nov 2020 17:09:15 +0800 Message-ID: <019c01d6b353$59e118f0$0da34ad0$@chinatelecom.cn> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-Mailer: Microsoft Outlook 16.0 Thread-Index: AQHBcZKtnN6H519STWFh4ttSE8lVhAKe8FwxAOQmWlkCohnENAFT1MQ2qaf3tXA= Content-Language: zh-cn Archived-At: Subject: Re: [Lsr] FW: New Version Notification for draft-wang-lsr-passive-interface-attribute-04.txt X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 05 Nov 2020 09:09:29 -0000 Hi, Peter: Yes, RFC 5392 is the OSPF corresponding part for the inter-AS TE = solution. But using these existing solutions has some limitation in = deployment, as I explained in = https://mailarchive.ietf.org/arch/msg/lsr/VLufuaGDiRgaflcu58FY_SHnJ7A/. And, in some situations, not all of the passive interfaces are connected = with another AS, then flag these interfaces using RFC 5316 or RFC 5392 = is not appropriate. Do you agree? Best Regards Aijun Wang China Telecom -----Original Message----- From: ppsenak@cisco.com [mailto:ppsenak@cisco.com]=20 Sent: Thursday, November 5, 2020 4:26 PM To: Aijun Wang ; 'Acee Lindem (acee)' = ; 'Aijun Wang' Cc: lsr@ietf.org Subject: Re: [Lsr] FW: New Version Notification for = draft-wang-lsr-passive-interface-attribute-04.txt Hi Aijun, please look at rfc5316, ISIS already have a way to advertise inter-AS = link without forming an adjacency. thanks, Peter On 05/11/2020 02:15, Aijun Wang wrote: > Hi, Acee: >=20 > Thanks for this comments. > The consideration for the position of flagging the passive interface = have been stated in the updated 05 version = https://tools.ietf.org/html/draft-wang-lsr-passive-interface-attribute-05= #section-3, as the followings: >=20 > ISIS [RFC5029] defines the Link-Attributes Sub-TLV to carry the = link > attribute information, but this Sub-TLV can only be carried within > the TLV 22, which is used to described the attached neighbor. For > passive interface, there is no ISIS neighbor, then it is not > appropriate to use this Sub-TLV to indicate the passive attribute = of > the interface. >=20 > OSPFv2[RFC2328] defines link type field within Router LSA, the = type 3 > for connections to a stub network can be used to identified the > passive interface. But in OSPFv3 [RFC5340], type 3 within the > Router-LSA has been reserved. The information that associated = with > stub network has been put in the Intra-Area-Prefix-LSAs. >=20 > What about your opinions regarding to the above statements? Currently, = we think putting the flag within the prefix attribute that associated = the passive interface is appropriate. > If we can find other appropriate/acceptable place to hold this = information, we can also update the draft later accordingly. >=20 >=20 > Best Regards >=20 > Aijun Wang > China Telecom >=20 >=20 > -----Original Message----- > From: Acee Lindem (acee) [mailto:acee@cisco.com] > Sent: Thursday, November 5, 2020 4:11 AM > To: Aijun Wang > Cc: Aijun Wang ; Peter Psenak (ppsenak)=20 > ; lsr@ietf.org > Subject: Re: [Lsr] FW: New Version Notification for=20 > draft-wang-lsr-passive-interface-attribute-04.txt >=20 > Hi Aijun, > You still didn't answer the question as to why you didn't rework this = draft for passive interface to be an interface attribute rather than a = prefix attribute? > Thanks, > Acee >=20 > On 10/1/20, 6:13 AM, "Acee Lindem (acee)" wrote: >=20 > Hi Aijun, > You didn't answer my question and pruned my message. Other than = your attempt to expose the topology of areas outside the area, there is = no other reason to associate the passive interface attribute with a = prefix. We seem to be in a circular discussion.... > Acee >=20 > On 9/30/20, 10:43 PM, "wangaj3@chinatelecom.cn on behalf of Aijun = Wang" wrote: >=20 > Hi, Acee: > Except the corner cases of unnumbered interface, would you = like to illustrate other scenarios that the process does not apply? > As mentioned in last mail, knowing the passive interfaces can = assist the nodes or controller know the boundaries of the network. >=20 > Aijun Wang > China Telecom >=20 > > On Sep 30, 2020, at 19:47, Acee Lindem (acee) = wrote: > > >=20 >=20 >=20 >=20 > _______________________________________________ > Lsr mailing list > Lsr@ietf.org > https://www.ietf.org/mailman/listinfo/lsr >=20 >=20 From nobody Thu Nov 5 01:15:11 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0A65E3A111A for ; Thu, 5 Nov 2020 01:15:10 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -9.848 X-Spam-Level: X-Spam-Status: No, score=-9.848 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, NICE_REPLY_A=-0.247, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id zB8WJH846__Z for ; Thu, 5 Nov 2020 01:15:05 -0800 (PST) Received: from aer-iport-2.cisco.com (aer-iport-2.cisco.com [173.38.203.52]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 760083A0C92 for ; Thu, 5 Nov 2020 01:15:05 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=4698; q=dns/txt; s=iport; t=1604567705; x=1605777305; h=subject:to:cc:references:from:message-id:date: mime-version:in-reply-to:content-transfer-encoding; bh=OaOBamZMJk1RCQaFlxEZIziplsEkXQGdazzCQJSDuGQ=; b=bhBHzCHkL7DQU5tStqwdA7yLOpW/ZEs36rH1o17k1SsSWLqhW8xc2gKF d02KuMdYCdWH8P6PxwZsoCWaYQXsAzQqbEv8r/7MueaQFH38nLpea47Rv hjjRNc+D+hcJyhboCfuwNwaJNnBOurDcEeXsIZn3vgpiCUN6tlMZKce5M 0=; X-IronPort-AV: E=Sophos;i="5.77,453,1596499200"; d="scan'208";a="30884690" Received: from aer-iport-nat.cisco.com (HELO aer-core-3.cisco.com) ([173.38.203.22]) by aer-iport-2.cisco.com with ESMTP/TLS/DHE-RSA-SEED-SHA; 05 Nov 2020 09:15:03 +0000 Received: from [10.60.140.53] (ams-ppsenak-nitro4.cisco.com [10.60.140.53]) by aer-core-3.cisco.com (8.15.2/8.15.2) with ESMTP id 0A59F3Au005481; Thu, 5 Nov 2020 09:15:03 GMT To: Aijun Wang , "'Aijun Wang'" , "'Acee Lindem (acee)'" Cc: lsr@ietf.org References: <32E90101-724C-4B38-8F11-7CF552B4F926@chinatelecom.cn> <33AEF7BB-F6C4-430F-966D-1AC5CE3266B4@cisco.com> <015801d6b311$2b1990c0$814cb240$@tsinghua.org.cn> <019c01d6b353$59e118f0$0da34ad0$@chinatelecom.cn> From: Peter Psenak Message-ID: Date: Thu, 5 Nov 2020 10:15:03 +0100 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: <019c01d6b353$59e118f0$0da34ad0$@chinatelecom.cn> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Outbound-SMTP-Client: 10.60.140.53, ams-ppsenak-nitro4.cisco.com X-Outbound-Node: aer-core-3.cisco.com Archived-At: Subject: Re: [Lsr] FW: New Version Notification for draft-wang-lsr-passive-interface-attribute-04.txt X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 05 Nov 2020 09:15:10 -0000 Aijun, the point I was trying to make was that you should think of a similar mechanism for your use cases - e.g. define something that advertises the link without advertising the IS adjacency and not mess up with the prefix advertisement. thanks, Peter On 05/11/2020 10:09, Aijun Wang wrote: > Hi, Peter: > > Yes, RFC 5392 is the OSPF corresponding part for the inter-AS TE solution. But using these existing solutions has some limitation in deployment, as I explained in https://mailarchive.ietf.org/arch/msg/lsr/VLufuaGDiRgaflcu58FY_SHnJ7A/. > And, in some situations, not all of the passive interfaces are connected with another AS, then flag these interfaces using RFC 5316 or RFC 5392 is not appropriate. > > Do you agree? > > > Best Regards > > Aijun Wang > China Telecom > > -----Original Message----- > From: ppsenak@cisco.com [mailto:ppsenak@cisco.com] > Sent: Thursday, November 5, 2020 4:26 PM > To: Aijun Wang ; 'Acee Lindem (acee)' ; 'Aijun Wang' > Cc: lsr@ietf.org > Subject: Re: [Lsr] FW: New Version Notification for draft-wang-lsr-passive-interface-attribute-04.txt > > Hi Aijun, > > please look at rfc5316, ISIS already have a way to advertise inter-AS link without forming an adjacency. > > thanks, > Peter > > On 05/11/2020 02:15, Aijun Wang wrote: >> Hi, Acee: >> >> Thanks for this comments. >> The consideration for the position of flagging the passive interface have been stated in the updated 05 version https://tools.ietf.org/html/draft-wang-lsr-passive-interface-attribute-05#section-3, as the followings: >> >> ISIS [RFC5029] defines the Link-Attributes Sub-TLV to carry the link >> attribute information, but this Sub-TLV can only be carried within >> the TLV 22, which is used to described the attached neighbor. For >> passive interface, there is no ISIS neighbor, then it is not >> appropriate to use this Sub-TLV to indicate the passive attribute of >> the interface. >> >> OSPFv2[RFC2328] defines link type field within Router LSA, the type 3 >> for connections to a stub network can be used to identified the >> passive interface. But in OSPFv3 [RFC5340], type 3 within the >> Router-LSA has been reserved. The information that associated with >> stub network has been put in the Intra-Area-Prefix-LSAs. >> >> What about your opinions regarding to the above statements? Currently, we think putting the flag within the prefix attribute that associated the passive interface is appropriate. >> If we can find other appropriate/acceptable place to hold this information, we can also update the draft later accordingly. >> >> >> Best Regards >> >> Aijun Wang >> China Telecom >> >> >> -----Original Message----- >> From: Acee Lindem (acee) [mailto:acee@cisco.com] >> Sent: Thursday, November 5, 2020 4:11 AM >> To: Aijun Wang >> Cc: Aijun Wang ; Peter Psenak (ppsenak) >> ; lsr@ietf.org >> Subject: Re: [Lsr] FW: New Version Notification for >> draft-wang-lsr-passive-interface-attribute-04.txt >> >> Hi Aijun, >> You still didn't answer the question as to why you didn't rework this draft for passive interface to be an interface attribute rather than a prefix attribute? >> Thanks, >> Acee >> >> On 10/1/20, 6:13 AM, "Acee Lindem (acee)" wrote: >> >> Hi Aijun, >> You didn't answer my question and pruned my message. Other than your attempt to expose the topology of areas outside the area, there is no other reason to associate the passive interface attribute with a prefix. We seem to be in a circular discussion.... >> Acee >> >> On 9/30/20, 10:43 PM, "wangaj3@chinatelecom.cn on behalf of Aijun Wang" wrote: >> >> Hi, Acee: >> Except the corner cases of unnumbered interface, would you like to illustrate other scenarios that the process does not apply? >> As mentioned in last mail, knowing the passive interfaces can assist the nodes or controller know the boundaries of the network. >> >> Aijun Wang >> China Telecom >> >> > On Sep 30, 2020, at 19:47, Acee Lindem (acee) wrote: >> > >> >> >> >> >> _______________________________________________ >> Lsr mailing list >> Lsr@ietf.org >> https://www.ietf.org/mailman/listinfo/lsr >> >> > > > _______________________________________________ > Lsr mailing list > Lsr@ietf.org > https://www.ietf.org/mailman/listinfo/lsr > > From nobody Thu Nov 5 03:04:59 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 4A5283A17C7 for ; Thu, 5 Nov 2020 03:04:50 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.9 X-Spam-Level: X-Spam-Status: No, score=-1.9 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 1Pbu_J_gPEke for ; Thu, 5 Nov 2020 03:04:46 -0800 (PST) Received: from chinatelecom.cn (prt-mail.chinatelecom.cn [42.123.76.223]) by ietfa.amsl.com (Postfix) with ESMTP id A06D03A1784 for ; Thu, 5 Nov 2020 03:04:40 -0800 (PST) HMM_SOURCE_IP: 172.18.0.218:8530.90761243 HMM_ATTACHE_NUM: 0000 HMM_SOURCE_TYPE: SMTP Received: from clientip-106.121.156.221?logid-640557dbc79e41c0ab804c19e2019c88 (unknown [172.18.0.218]) by chinatelecom.cn (HERMES) with SMTP id E30B7280092; Thu, 5 Nov 2020 19:04:35 +0800 (CST) X-189-SAVE-TO-SEND: 66040164@chinatelecom.cn Received: from ([172.18.0.218]) by App0025 with ESMTP id 640557dbc79e41c0ab804c19e2019c88 for wangaijun@tsinghua.org.cn; Thu Nov 5 19:04:38 2020 X-Transaction-ID: 640557dbc79e41c0ab804c19e2019c88 X-filter-score: filter<0> X-Real-From: wangaj3@chinatelecom.cn X-Receive-IP: 172.18.0.218 X-MEDUSA-Status: 0 Sender: wangaj3@chinatelecom.cn Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable From: Aijun Wang Mime-Version: 1.0 (1.0) Date: Thu, 5 Nov 2020 19:04:33 +0800 Message-Id: <204560AE-A58C-49C3-A882-2AE8FF145D0A@chinatelecom.cn> References: Cc: Aijun Wang , "Acee Lindem (acee)" , lsr@ietf.org In-Reply-To: To: Peter Psenak X-Mailer: iPhone Mail (18A373) Archived-At: Subject: Re: [Lsr] FW: New Version Notification for draft-wang-lsr-passive-interface-attribute-04.txt X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 05 Nov 2020 11:04:57 -0000 Hi, Peter: Then how about defines one new top TLV to flood such information within the I= GP? Fox example, Stub-Link TLV? If so, other characteristics associated with= the Link can also be advertised accordingly.=20 If acceptable, we can forward this draft along this direction. Aijun Wang China Telecom > On Nov 5, 2020, at 17:15, Peter Psenak wrote: >=20 > =EF=BB=BFAijun, >=20 > the point I was trying to make was that you should think of a similar mech= anism for your use cases - e.g. define something that advertises the link wi= thout advertising the IS adjacency and not mess up with the prefix advertise= ment. >=20 > thanks, > Peter >=20 >> On 05/11/2020 10:09, Aijun Wang wrote: >> Hi, Peter: >> Yes, RFC 5392 is the OSPF corresponding part for the inter-AS TE solution= . But using these existing solutions has some limitation in deployment, as I= explained in https://mailarchive.ietf.org/arch/msg/lsr/VLufuaGDiRgaflcu58FY= _SHnJ7A/. >> And, in some situations, not all of the passive interfaces are connected w= ith another AS, then flag these interfaces using RFC 5316 or RFC 5392 is not= appropriate. >> Do you agree? >> Best Regards >> Aijun Wang >> China Telecom >> -----Original Message----- >> From: ppsenak@cisco.com [mailto:ppsenak@cisco.com] >> Sent: Thursday, November 5, 2020 4:26 PM >> To: Aijun Wang ; 'Acee Lindem (acee)' ; 'Aijun Wang' >> Cc: lsr@ietf.org >> Subject: Re: [Lsr] FW: New Version Notification for draft-wang-lsr-passiv= e-interface-attribute-04.txt >> Hi Aijun, >> please look at rfc5316, ISIS already have a way to advertise inter-AS lin= k without forming an adjacency. >> thanks, >> Peter >>> On 05/11/2020 02:15, Aijun Wang wrote: >>> Hi, Acee: >>>=20 >>> Thanks for this comments. >>> The consideration for the position of flagging the passive interface hav= e been stated in the updated 05 version https://tools.ietf.org/html/draft-wa= ng-lsr-passive-interface-attribute-05#section-3, as the followings: >>>=20 >>> ISIS [RFC5029] defines the Link-Attributes Sub-TLV to carry the link= >>> attribute information, but this Sub-TLV can only be carried within >>> the TLV 22, which is used to described the attached neighbor. For >>> passive interface, there is no ISIS neighbor, then it is not >>> appropriate to use this Sub-TLV to indicate the passive attribute of= >>> the interface. >>>=20 >>> OSPFv2[RFC2328] defines link type field within Router LSA, the type 3= >>> for connections to a stub network can be used to identified the >>> passive interface. But in OSPFv3 [RFC5340], type 3 within the >>> Router-LSA has been reserved. The information that associated with >>> stub network has been put in the Intra-Area-Prefix-LSAs. >>>=20 >>> What about your opinions regarding to the above statements? Currently, w= e think putting the flag within the prefix attribute that associated the pas= sive interface is appropriate. >>> If we can find other appropriate/acceptable place to hold this informati= on, we can also update the draft later accordingly. >>>=20 >>>=20 >>> Best Regards >>>=20 >>> Aijun Wang >>> China Telecom >>>=20 >>>=20 >>> -----Original Message----- >>> From: Acee Lindem (acee) [mailto:acee@cisco.com] >>> Sent: Thursday, November 5, 2020 4:11 AM >>> To: Aijun Wang >>> Cc: Aijun Wang ; Peter Psenak (ppsenak) >>> ; lsr@ietf.org >>> Subject: Re: [Lsr] FW: New Version Notification for >>> draft-wang-lsr-passive-interface-attribute-04.txt >>>=20 >>> Hi Aijun, >>> You still didn't answer the question as to why you didn't rework this dr= aft for passive interface to be an interface attribute rather than a prefix a= ttribute? >>> Thanks, >>> Acee >>>=20 >>>> On 10/1/20, 6:13 AM, "Acee Lindem (acee)" wrote: >>>=20 >>> Hi Aijun, >>> You didn't answer my question and pruned my message. Other than you= r attempt to expose the topology of areas outside the area, there is no othe= r reason to associate the passive interface attribute with a prefix. We seem= to be in a circular discussion.... >>> Acee >>>=20 >>>> On 9/30/20, 10:43 PM, "wangaj3@chinatelecom.cn on behalf of Aijun W= ang" wrote: >>>=20 >>> Hi, Acee: >>> Except the corner cases of unnumbered interface, would you like= to illustrate other scenarios that the process does not apply? >>> As mentioned in last mail, knowing the passive interfaces can a= ssist the nodes or controller know the boundaries of the network. >>>=20 >>> Aijun Wang >>> China Telecom >>>=20 >>> > On Sep 30, 2020, at 19:47, Acee Lindem (acee) wrote: >>> > >>>=20 >>>=20 >>>=20 >>>=20 >>> _______________________________________________ >>> Lsr mailing list >>> Lsr@ietf.org >>> https://www.ietf.org/mailman/listinfo/lsr >>>=20 >>>=20 >> _______________________________________________ >> Lsr mailing list >> Lsr@ietf.org >> https://www.ietf.org/mailman/listinfo/lsr >=20 From nobody Thu Nov 5 08:04:13 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from 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X-MS-Exchange-CrossTenant-AuthSource: SN6PR13MB2334.namprd13.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: ffdd47f1-7aa8-4a06-8546-08d881abd480 X-MS-Exchange-CrossTenant-originalarrivaltime: 05 Nov 2020 16:57:07.6638 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 0fee8ff2-a3b2-4018-9c75-3a1d5591fedc X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: DdvyXotbBqqX6oAp17mo84WXExSAF/QvigTkdypIa67g5JKGxjltXti3xN3hP6VyMJgyDzejQh39YJEDmJYuGA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA0PR13MB3936 Archived-At: Subject: Re: [Lsr] Question on using OSFPv2 extended Prefix TLV as the OSPF extension for 5G Edge Computing (was RE: IETF 109 LSR Presentation Slot Requests X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 05 Nov 2020 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--_000_SN6PR13MB2334971229F82505F2A31E0985EE0SN6PR13MB2334namp_-- From nobody Thu Nov 5 17:20:48 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id DE8233A0A47; Thu, 5 Nov 2020 17:20:46 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.796 X-Spam-Level: X-Spam-Status: No, score=-1.796 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, HTTPS_HTTP_MISMATCH=0.1, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=no autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ieMZY9Vdb1dl; Thu, 5 Nov 2020 17:20:44 -0800 (PST) Received: from mail-m127101.qiye.163.com (mail-m127101.qiye.163.com [115.236.127.101]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 4A4453A0A3E; Thu, 5 Nov 2020 17:20:41 -0800 (PST) Received: from DESKTOP2IOH5QC (unknown [219.142.69.75]) by mail-m127101.qiye.163.com (Hmail) with ESMTPA id E403947F68; Fri, 6 Nov 2020 09:20:37 +0800 (CST) From: "Aijun Wang" To: "'Linda Dunbar'" , "'Acee Lindem \(acee\)'" , "'Yingzhen Qu'" , , References: <016301d6b317$b7fd7870$27f86950$@tsinghua.org.cn> In-Reply-To: Date: Fri, 6 Nov 2020 09:20:36 +0800 Message-ID: <008001d6b3db$085bc510$19134f30$@tsinghua.org.cn> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0081_01D6B41E.1684AA60" X-Mailer: Microsoft Outlook 16.0 Thread-Index: AQD2J7U/Llv21jdkogB4O2EIjUtqHQHqhSVQAm1ltiKrWKNBcA== Content-Language: zh-cn X-HM-Spam-Status: e1kfGhgUHx5ZQUtXWQgYFAkeWUFZS1VLWVdZKFlBSkxLS0o3V1ktWUFJV1 kPCRoVCBIfWUFZT00dTB4eQx9MGksaVkpNS09NSU5NSENISE5VEwETFhoSFyQUDg9ZV1kWGg8SFR 0UWUFZT0tIVUpKS0hPQ1VLWQY+ X-HM-Sender-Digest: e1kMHhlZQR0aFwgeV1kSHx4VD1lBWUc6Oj46Cio5Lj8pPx06PxY9SDM3 MDEwCSlVSlVKTUtPTUlOTUhDQ0pIVTMWGhIXVQwaFRwaEhEOFTsPCBIVHBMOGlUUCRxVGBVFWVdZ EgtZQVlJSkJVSk9JVU1CVUxOWVdZCAFZQU9CSU1PNwY+ X-HM-Tid: 0a759b24230a9865kuuue403947f68 Archived-At: Subject: Re: [Lsr] Question on using OSFPv2 extended Prefix TLV as the OSPF extension for 5G Edge Computing (was RE: IETF 109 LSR Presentation Slot Requests X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 06 Nov 2020 01:20:47 -0000 This is a multipart message in MIME format. ------=_NextPart_000_0081_01D6B41E.1684AA60 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable =20 Hi, Linda: =20 For example,=20 What=E2=80=99s the update frequency of the App server status data? Will = it influence the SPF efficiency on each flooding router etc.? =20 =20 Best Regards =20 Aijun Wang China Telecom =20 From: Linda Dunbar [mailto:linda.dunbar@futurewei.com]=20 Sent: Friday, November 6, 2020 12:57 AM To: Aijun Wang ; 'Acee Lindem (acee)' = ; 'Yingzhen Qu' ; lsr@ietf.org; = lsr-chairs@ietf.org Subject: RE: [Lsr] Question on using OSFPv2 extended Prefix TLV as the = OSPF extension for 5G Edge Computing (was RE: IETF 109 LSR Presentation = Slot Requests =20 Ai Jun,=20 =20 Can you elaborate more on your proposed =E2=80=9Canalysis for the = flooding influences=E2=80=9D?=20 =20 Thank you very much.=20 =20 Linda =20 From: Aijun Wang >=20 Sent: Wednesday, November 4, 2020 8:03 PM To: Linda Dunbar >; 'Acee Lindem (acee)' = >; 'Yingzhen Qu' = >; = lsr@ietf.org ; lsr-chairs@ietf.org = =20 Subject: RE: [Lsr] Question on using OSFPv2 extended Prefix TLV as the = OSPF extension for 5G Edge Computing (was RE: IETF 109 LSR Presentation = Slot Requests =20 Hi, Linda: =20 Is it better to add some analysis for the flooding influences on the = router performance when we add such dynamic information within the IGP = protocol? =20 =20 Best Regards =20 Aijun Wang China Telecom =20 From: lsr-bounces@ietf.org = [mailto:lsr-bounces@ietf.org] On Behalf Of Linda Dunbar Sent: Thursday, November 5, 2020 6:44 AM To: Acee Lindem (acee) >; = Yingzhen Qu >; = lsr@ietf.org ; lsr-chairs@ietf.org = =20 Subject: [Lsr] Question on using OSFPv2 extended Prefix TLV as the OSPF = extension for 5G Edge Computing (was RE: IETF 109 LSR Presentation Slot = Requests =20 Acee,=20 =20 Thank you very much for suggesting using the Prefix TLV for carry the = Running Status and environment of 5G Edge Computing servers.=20 =20 In a nutshell, the = https://datatracker.ietf.org/doc/draft-dunbar-lsr-5g-edge-compute-ospf-ex= t/ = proposes the extension to LSA that can carry the = three SubTLVs that are used to represent the Running Status and = Environment information of the 5G Edge Computing Servers attached to the = router: =20 =C3=98 Load measurement sub-TLV =20 =C3=98 Capacity Index Sub-TLV =20 =C3=98 Preference Index Sub-TLV = =20 =20 Several sections of the draft are devoted to describe what those = measurement are and why need them for 5G Edge Computing, which may have = made it not so straightforward when reading in a rush.=20 =20 The Goal of the OSPF extension is to carry those Sub-TLVs in the = router=E2=80=99s LSA to be advertised to other routers in the 5G Local = Data Network.=20 =20 If using your suggested RFC7684 OSPFv2 Extended Prefix TLV, the = extension does seem easier and cleaner:=20 =20 We can have:=20 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Type | Length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Route Type | Prefix Length | AF | Flags | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Address Prefix (variable) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ =20 | Load Measurement Sub-TLV |=20 ~ ~=20 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ =20 | capacity Index Sub-TLV |=20 ~ ~=20 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ =20 | Site Preference Sub-TLV |=20 ~ ~ =20 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ =20 =20 =20 RFC7684 only has the Extended Prefix TLV for IPv4. If the App Server = addresses are in IPv6, should we specify the extension to RFC8362 in the = same draft? Or define a new AF type for the same extension to RFC7684?=20 =20 Your guidance is greatly appreciated.=20 =20 Thank you very much.=20 =20 Linda Dunbar =20 =20 From: Acee Lindem (acee) >=20 Sent: Tuesday, November 3, 2020 1:38 PM To: Linda Dunbar >; Yingzhen Qu = >; = lsr@ietf.org ; lsr-chairs@ietf.org = =20 Subject: Re: Need 10 minute slot to discuss OSPF extension for 5G Edge = Computing (was RE: [Lsr] IETF 109 LSR Presentation Slot Requests =20 We have a pretty full schedule and we add you as optional. I took a look = at the draft and it is all over the place right now with standardization = requested for one solution but 3 separate solutions partially specified. = It could benefit from some WG mailing list discussion prior to a 10 = minute presentation where we wouldn=E2=80=99t have time to discuss the = many issues.=20 =20 One major issue is that you should be extending RFC 7684 rather than RFC = 3630 and it seems you these app-server selection metrics should be = associated with a prefix and NOT a stub link (i.e., the application = server address). =20 I=E2=80=99ll try to read it in more depth before IETF 109.=20 =20 Thanks, Acee =20 From: Linda Dunbar > Date: Monday, November 2, 2020 at 10:12 PM To: Yingzhen Qu >, "lsr@ietf.org = " >, "lsr-chairs@ietf.org = " > Subject: Need 10 minute slot to discuss OSPF extension for 5G Edge = Computing (was RE: [Lsr] IETF 109 LSR Presentation Slot Requests Resent-From: > Resent-To: Yingzhen Qu >, Acee Lindem >, Christian Hopps > Resent-Date: Monday, November 2, 2020 at 10:12 PM =20 LSR Chairs, YingZhen,=20 =20 Can you give us 10 minute slot to present this new draft: https://datatracker.ietf.org/doc/draft-dunbar-lsr-5g-edge-compute-ospf-ex= t/ = =20 =20 This draft describes an OSPF extension that can distribute the 5G Edge = Computing App running status and environment, so that other routers in = the 5G Local Data Network can make intelligent decision on optimizing = forwarding of flows from UEs. The goal is to improve latency and = performance for 5G Edge Computing services.=20 =20 Thank you very much,=20 =20 Linda Dunbar =20 From: Lsr > On = Behalf Of Yingzhen Qu Sent: Monday, October 19, 2020 3:52 PM To: lsr@ietf.org ; lsr-chairs@ietf.org = =20 Subject: [Lsr] IETF 109 LSR Presentation Slot Requests =20 Hi all,=20 =20 We're now accepting agenda requests for the LSR Working Grouping meeting = IETF 109. Please send your requests to = lsr-chairs@ietf.org indicating draft name, speaker, and desired duration = (covering presentation and discussion).=20 =20 LSR session is scheduled on Monday, Nov 16, 12:00-14:00 ICT. =20 Thanks, Yingzhen ------=_NextPart_000_0081_01D6B41E.1684AA60 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable

<= o:p> 

H= i, Linda:

<= o:p> 

F= or example,

W= hat=E2=80=99s the update frequency of the App server status data?=C2=A0 = Will it influence the SPF efficiency on each flooding router = etc.?

<= o:p> 

<= o:p> 

B= est Regards

<= o:p> 

A= ijun Wang

C= hina Telecom<= o:p>

<= o:p> 

From: Linda Dunbar = [mailto:linda.dunbar@futurewei.com]
Sent: Friday, November 6, = 2020 12:57 AM
To: Aijun Wang = <wangaijun@tsinghua.org.cn>; 'Acee Lindem (acee)' = <acee@cisco.com>; 'Yingzhen Qu' <yingzhen.ietf@gmail.com>; = lsr@ietf.org; lsr-chairs@ietf.org
Subject: RE: [Lsr] Question = on using OSFPv2 extended Prefix TLV as the OSPF extension for 5G Edge = Computing (was RE: IETF 109 LSR Presentation Slot = Requests

 

Ai Jun,

 

Can you elaborate more on your proposed =E2=80=9Canalysis = for the flooding influences=E2=80=9D?

 

Thank you very much.

 

Linda

 

From: Aijun Wang <wangaijun@tsinghua.org.cn&g= t;
Sent: Wednesday, November 4, 2020 8:03 PM
To: = Linda Dunbar <linda.dunbar@futurewei.com= >; 'Acee Lindem (acee)' <acee@cisco.com>; 'Yingzhen Qu' = <yingzhen.ietf@gmail.com>; = lsr@ietf.org; lsr-chairs@ietf.org
Subject= : RE: [Lsr] Question on using OSFPv2 extended Prefix TLV as the OSPF = extension for 5G Edge Computing (was RE: IETF 109 LSR Presentation Slot = Requests

 

H= i, Linda:

<= o:p> 

I= s it better to add some analysis for the flooding influences on the = router performance when we add such dynamic information within the IGP = protocol?

<= o:p> 

<= o:p> 

B= est Regards

<= o:p> 

A= ijun Wang

C= hina Telecom

<= o:p> 

From: lsr-bounces@ietf.org [mailto:lsr-bounces@ietf.org] = On Behalf Of Linda Dunbar
Sent: Thursday, November 5, = 2020 6:44 AM
To: Acee Lindem (acee) <acee@cisco.com>; Yingzhen Qu = <yingzhen.ietf@gmail.com>; = lsr@ietf.org; lsr-chairs@ietf.org
Subject= : [Lsr] Question on using OSFPv2 extended Prefix TLV as the OSPF = extension for 5G Edge Computing (was RE: IETF 109 LSR Presentation Slot = Requests

 

Acee, =

 

Thank you very much for = suggesting using the Prefix TLV for carry the Running Status and = environment of 5G Edge Computing servers.

 

In a nutshell, the https://datatracker.ietf.org/doc/dr= aft-dunbar-lsr-5g-edge-compute-ospf-ext/ proposes the extension to = LSA that can carry the three SubTLVs that are used to represent the = Running Status and Environment information of the 5G Edge Computing = Servers attached to the router:

 

=C3=98  Load measurement sub-TLV  =

=C3=98  Capacity Index =  Sub-TLV          =             &= nbsp;     

=C3=98  Preference Index  = Sub-TLV           =             &= nbsp;  =             &= nbsp;           &n= bsp;

 

Several sections of the = draft are devoted to describe what those measurement are and why need = them for 5G Edge Computing, which may have made it not so = straightforward when reading in a rush.

 

The Goal of the OSPF = extension is to carry those Sub-TLVs in the router=E2=80=99s LSA to be = advertised to other routers in the 5G Local Data Network. =

 

If using your suggested = RFC7684 OSPFv2 Extended Prefix TLV, the extension does seem easier and = cleaner:

 

We can have: =

 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 = 0 1

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

| = Type           &nb= sp;           &nbs= p;  | Length =             &= nbsp;          |

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

| Route Type    | Prefix Length | AF =            | = Flags        =  |

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

| Address Prefix (variable) =             &= nbsp;           &n= bsp;           |

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+&n= bsp; 

| Load = Measurement = Sub-TLV           =             &= nbsp;           &n= bsp;  |

~           =             &= nbsp;           &n= bsp;           &nb= sp;           &nbs= p;   ~

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+&n= bsp; 

| = capacity Index = Sub-TLV           =      =             &= nbsp;           | =

~           =             &= nbsp;           &n= bsp;           &nb= sp;           &nbs= p;   ~

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+&n= bsp; 

| Site = Preference = Sub-TLV           =   =             &= nbsp;           &n= bsp; |

~           =             &= nbsp;           &n= bsp;           &nb= sp;           &nbs= p;   ~  

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+&n= bsp; 

 

 

RFC7684 only has the = Extended Prefix TLV for IPv4. If the App Server addresses are in IPv6, = should we specify the extension to RFC8362 in the same draft? Or define = a new AF type for the same extension to RFC7684? =

 

Your guidance is = greatly appreciated.

 

Thank you very much. =

 

Linda = Dunbar

 

 

From: Acee Lindem (acee) = <acee@cisco.com> =
Sent: Tuesday, November 3, 2020 1:38 PM
To: Linda = Dunbar <linda.dunbar@futurewei.com= >; Yingzhen Qu <yingzhen.ietf@gmail.com>; = lsr@ietf.org; lsr-chairs@ietf.org
Subject= : Re: Need 10 minute slot to discuss OSPF extension for 5G Edge = Computing (was RE: [Lsr] IETF 109 LSR Presentation Slot = Requests

 

We have a pretty full schedule and we add you as optional. = I took a look at the draft and it is all over the place right now with = standardization requested for one solution but 3 separate solutions = partially specified. It could benefit from some WG mailing list = discussion prior to a 10 minute presentation where we wouldn=E2=80=99t = have time to discuss the many issues.

 

One major issue is that you should be extending RFC 7684 = rather than RFC 3630 and it seems you these app-server selection metrics = should be associated with a prefix and NOT a stub link (i.e., the = application server address).

 

I=E2=80=99ll try to read it in more depth before IETF 109. =

 

Thanks,
Acee

 

From: = Linda Dunbar <linda.dunbar@futurewei.com= >
Date: Monday, November 2, 2020 at 10:12 PM
To: = Yingzhen Qu <yingzhen.ietf@gmail.com>, = "lsr@ietf.org" <lsr@ietf.org>, "lsr-chairs@ietf.org" <lsr-chairs@ietf.org>
Sub= ject: Need 10 minute slot to discuss OSPF extension for 5G Edge = Computing (was RE: [Lsr] IETF 109 LSR Presentation Slot = Requests
Resent-From: <alias-bounces@ietf.org>
= Resent-To: Yingzhen Qu <yingzhen.ietf@gmail.com>, = Acee Lindem <acee@cisco.com>, Christian Hopps = <chopps@chopps.org>
Resent-= Date: Monday, November 2, 2020 at 10:12 = PM

 

LSR Chairs, YingZhen,

 

Can you give us 10 minute slot to present this new = draft:

https://datatracker.ietf.org/do= c/draft-dunbar-lsr-5g-edge-compute-ospf-ext/

 

This draft describes = an OSPF extension that can distribute the 5G = Edge Computing App running status and environment, so that other routers = in the 5G Local Data Network can make intelligent decision on optimizing = forwarding of flows from UEs. The goal is to improve latency and = performance for 5G Edge Computing services.

 

Thank you very much,

 

Linda Dunbar

 

From: Lsr <lsr-bounces@ietf.org> On = Behalf Of Yingzhen Qu
Sent: Monday, October 19, 2020 3:52 = PM
To: lsr@ietf.org; lsr-chairs@ietf.org
Subject= : [Lsr] IETF 109 LSR Presentation Slot = Requests

 

Hi all, 

 

We're now accepting agenda requests for the = LSR Working Grouping meeting IETF 109. Please send your requests = to lsr-chairs@ietf.org indicating = draft name, speaker, and desired duration (covering presentation and = discussion). 

 

LSR session is scheduled on Monday, Nov 16, = 12:00-14:00 ICT.

 

Thanks,

Yingzhen

------=_NextPart_000_0081_01D6B41E.1684AA60-- From nobody Thu Nov 5 17:35:06 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 46E923A0A85; Thu, 5 Nov 2020 17:35:04 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.796 X-Spam-Level: X-Spam-Status: No, score=-1.796 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, HTTPS_HTTP_MISMATCH=0.1, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=no autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id RMu1C1TOQryt; Thu, 5 Nov 2020 17:35:01 -0800 (PST) Received: from mail-m127101.qiye.163.com (mail-m127101.qiye.163.com [115.236.127.101]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 1839C3A0A86; Thu, 5 Nov 2020 17:34:59 -0800 (PST) Received: from DESKTOP2IOH5QC (unknown [219.142.69.75]) by mail-m127101.qiye.163.com (Hmail) with ESMTPA id E34A547627; Fri, 6 Nov 2020 09:34:55 +0800 (CST) From: "Aijun Wang" To: "'Linda Dunbar'" , "'Acee Lindem \(acee\)'" , "'Peter Psenak'" , "'Jeff Tantsura'" , "'Yingzhen Qu'" , , References: <9af88324-b117-4272-b21d-29002f9183fd@Spark> <75281559-0A10-4F81-B358-AAE2CBA0DE2B@cisco.com> In-Reply-To: Date: Fri, 6 Nov 2020 09:34:54 +0800 Message-ID: <008a01d6b3dd$07c3b8e0$174b2aa0$@tsinghua.org.cn> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_008B_01D6B420.15EE24D0" X-Mailer: Microsoft Outlook 16.0 Thread-Index: AQD2J7U/Llv21jdkogB4O2EIjUtqHQNgqO6mAg0tJwcCMsHvUKs+Yljg Content-Language: zh-cn X-HM-Spam-Status: e1kfGhgUHx5ZQUtXWQgYFAkeWUFZS1VLWVdZKFlBSkxLS0o3V1ktWUFJV1 kPCRoVCBIfWUFZSUhDGBlIGB4eS00fVkpNS09NSU1PQk1ITkNVEwETFhoSFyQUDg9ZV1kWGg8SFR 0UWUFZT0tIVUpKS09ISFVLWQY+ X-HM-Sender-Digest: e1kMHhlZQR0aFwgeV1kSHx4VD1lBWUc6PSo6HSo4TT8eFR02ERYsTw8L TRQwCT5VSlVKTUtPTUlNT0JMS0lJVTMWGhIXVQwaFRwaEhEOFTsPCBIVHBMOGlUUCRxVGBVFWVdZ EgtZQVlJSkJVSk9JVU1CVUxOWVdZCAFZQUxJSENINwY+ X-HM-Tid: 0a759b313aae9865kuuue34a547627 Archived-At: Subject: Re: [Lsr] Question on using OSFPv2 extended Prefix TLV as the OSPF extension for 5G Edge Computing (was RE: IETF 109 LSR Presentation Slot Requests X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 06 Nov 2020 01:35:04 -0000 This is a multipart message in MIME format. ------=_NextPart_000_008B_01D6B420.15EE24D0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Hi, Linda, Acee, Jeff and Peter: =20 >From this use case, together with another = draft(https://datatracker.ietf.org/doc/draft-wang-lsr-passive-interface-a= ttribute/) that we are proposing and discussing, as in = https://mailarchive.ietf.org/arch/msg/lsr/imojDOsS3W3B2H2SbmUT0QKjbxM/ It is more convincible to define one new top TLV, for example, Stub-Link = TLV, to contain your current proposed sub-TLV, and other futures = information. =20 The information contained within the Stub-Link TLV, will not participate = the SPF calculation on each router. =20 It is more clear than to put this information associated with the Prefix = TLV. =20 =20 Best Regards =20 Aijun Wang China Telecom =20 =20 From: lsr-bounces@ietf.org [mailto:lsr-bounces@ietf.org] On Behalf Of = Linda Dunbar Sent: Friday, November 6, 2020 12:04 AM To: Acee Lindem (acee) ; Jeff Tantsura = ; Yingzhen Qu ; = lsr@ietf.org; lsr-chairs@ietf.org Subject: Re: [Lsr] Question on using OSFPv2 extended Prefix TLV as the = OSPF extension for 5G Edge Computing (was RE: IETF 109 LSR Presentation = Slot Requests =20 Jeff and Acee,=20 =20 I understand that RFC8362 has specifies Extended Prefix TLV for IPv6. =20 Since there are two separate RFCs for the Extended Prefix TLV, one for = IPv4 and another one for IPv6, I was asking if the Sub-TLVs proposed = for 5G Edge Computing needs to have two separate drafts: one for IPv4 = and another one for IPv6? Or just one draft to describe the extension = to both RFCs?=20 =20 Your guidance is greatly appreciated.=20 =20 Linda =20 From: Acee Lindem (acee) >=20 Sent: Wednesday, November 4, 2020 6:42 PM To: Jeff Tantsura >; Yingzhen Qu >; lsr@ietf.org ; = lsr-chairs@ietf.org ; Linda Dunbar = > Subject: Re: [Lsr] Question on using OSFPv2 extended Prefix TLV as the = OSPF extension for 5G Edge Computing (was RE: IETF 109 LSR Presentation = Slot Requests =20 Exactly.=20 Thanks, Acee =20 From: Jeff Tantsura Date: Wednesday, November 4, 2020 at 6:16 PM To: Acee Lindem >, Yingzhen Qu = >, = "lsr@ietf.org " >, "lsr-chairs@ietf.org = " >, Linda Dunbar > Subject: Re: [Lsr] Question on using OSFPv2 extended Prefix TLV as the = OSPF extension for 5G Edge Computing (was RE: IETF 109 LSR Presentation = Slot Requests =20 For OSPFv3 use E-LSAs (RFC8362) =20 Cheers,=20 Jeff On Nov 4, 2020, 2:44 PM -0800, Linda Dunbar >, wrote: Acee, =20 Thank you very much for suggesting using the Prefix TLV for carry the = Running Status and environment of 5G Edge Computing servers. =20 In a nutshell, the = = https://datatracker.ietf.org/doc/draft-dunbar-lsr-5g-edge-compute-ospf-ex= t/ proposes the extension to LSA that can carry the three SubTLVs that = are used to represent the Running Status and Environment information of = the 5G Edge Computing Servers attached to the router: =20 =E2=80=A2 Load measurement sub-TLV=20 =E2=80=A2 Capacity Index Sub-TLV =20 =E2=80=A2 Preference Index Sub-TLV = =20 =20 Several sections of the draft are devoted to describe what those = measurement are and why need them for 5G Edge Computing, which may have = made it not so straightforward when reading in a rush. =20 The Goal of the OSPF extension is to carry those Sub-TLVs in the = router=E2=80=99s LSA to be advertised to other routers in the 5G Local = Data Network. =20 If using your suggested RFC7684 OSPFv2 Extended Prefix TLV, the = extension does seem easier and cleaner: =20 We can have: 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Type | Length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Route Type | Prefix Length | AF | Flags | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Address Prefix (variable) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ =20 | Load Measurement Sub-TLV | ~ ~ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ =20 | capacity Index Sub-TLV | ~ ~ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ =20 | Site Preference Sub-TLV | ~ ~ =20 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ =20 =20 =20 RFC7684 only has the Extended Prefix TLV for IPv4. If the App Server = addresses are in IPv6, should we specify the extension to RFC8362 in the = same draft? Or define a new AF type for the same extension to RFC7684? =20 Your guidance is greatly appreciated. =20 Thank you very much. =20 Linda Dunbar =20 =20 From: Acee Lindem (acee) > Sent: Tuesday, November 3, 2020 1:38 PM To: Linda Dunbar >; Yingzhen Qu = >; = lsr@ietf.org ; lsr-chairs@ietf.org = =20 Subject: Re: Need 10 minute slot to discuss OSPF extension for 5G Edge = Computing (was RE: [Lsr] IETF 109 LSR Presentation Slot Requests =20 We have a pretty full schedule and we add you as optional. I took a look = at the draft and it is all over the place right now with standardization = requested for one solution but 3 separate solutions partially specified. = It could benefit from some WG mailing list discussion prior to a 10 = minute presentation where we wouldn=E2=80=99t have time to discuss the = many issues. =20 One major issue is that you should be extending RFC 7684 rather than RFC = 3630 and it seems you these app-server selection metrics should be = associated with a prefix and NOT a stub link (i.e., the application = server address). =20 I=E2=80=99ll try to read it in more depth before IETF 109. =20 Thanks, Acee =20 From: Linda Dunbar < = linda.dunbar@futurewei.com> Date: Monday, November 2, 2020 at 10:12 PM To: Yingzhen Qu < = yingzhen.ietf@gmail.com>, " lsr@ietf.org" < = lsr@ietf.org>, " = lsr-chairs@ietf.org" < lsr-chairs@ietf.org> Subject: Need 10 minute slot to discuss OSPF extension for 5G Edge = Computing (was RE: [Lsr] IETF 109 LSR Presentation Slot Requests Resent-From: < alias-bounces@ietf.org> Resent-To: Yingzhen Qu < = yingzhen.ietf@gmail.com>, Acee Lindem < = acee@cisco.com>, Christian Hopps < = chopps@chopps.org> Resent-Date: Monday, November 2, 2020 at 10:12 PM =20 LSR Chairs, YingZhen, =20 Can you give us 10 minute slot to present this new draft: https://datatracker.ietf.org/doc/draft-dunbar-lsr-5g-edge-compute-ospf-ex= t/ = =20 =20 This draft describes an OSPF extension that can distribute the 5G Edge = Computing App running status and environment, so that other routers in = the 5G Local Data Network can make intelligent decision on optimizing = forwarding of flows from UEs. The goal is to improve latency and = performance for 5G Edge Computing services. =20 Thank you very much, =20 Linda Dunbar =20 From: Lsr > On = Behalf Of Yingzhen Qu Sent: Monday, October 19, 2020 3:52 PM To: lsr@ietf.org ; lsr-chairs@ietf.org = =20 Subject: [Lsr] IETF 109 LSR Presentation Slot Requests =20 Hi all,=20 =20 We're now accepting agenda requests for the LSR Working Grouping meeting = IETF 109. Please send your requests to = lsr-chairs@ietf.org indicating draft name, speaker, and desired duration = (covering presentation and discussion).=20 =20 LSR session is scheduled on Monday, Nov 16, 12:00-14:00 ICT. =20 Thanks, Yingzhen _______________________________________________ Lsr mailing list Lsr@ietf.org =20 https://www.ietf.org/mailman/listinfo/lsr ------=_NextPart_000_008B_01D6B420.15EE24D0 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable

H= i, Linda, Acee, Jeff and Peter:

<= o:p> 

F= rom this use case, together with another draft(https://datatracker.ietf.org/doc/draft-wang-lsr-passive-inte= rface-attribute/) that we are proposing and discussing, as in https://mailarchive.ietf.org/arch/msg/lsr/imojDOsS3W3B2H2SbmUT0QKj= bxM/

I= t is more convincible to define one new top TLV, for example, Stub-Link = TLV, to contain your current proposed sub-TLV, and other futures = information.

<= o:p> 

T= he information contained within the Stub-Link TLV, will not participate = the SPF calculation on each router. =C2=A0

I= t is more clear than to put this information associated with the Prefix = TLV.

<= o:p> 

<= o:p> 

B= est Regards

<= o:p> 

A= ijun Wang

C= hina Telecom<= o:p>

<= o:p> 

<= o:p> 

From: lsr-bounces@ietf.org = [mailto:lsr-bounces@ietf.org] On Behalf Of Linda = Dunbar
Sent: Friday, November 6, 2020 12:04 AM
To: = Acee Lindem (acee) <acee@cisco.com>; Jeff Tantsura = <jefftant.ietf@gmail.com>; Yingzhen Qu = <yingzhen.ietf@gmail.com>; lsr@ietf.org; = lsr-chairs@ietf.org
Subject: Re: [Lsr] Question on using = OSFPv2 extended Prefix TLV as the OSPF extension for 5G Edge Computing = (was RE: IETF 109 LSR Presentation Slot = Requests

 

Jeff and Acee,

 

I understand that RFC8362 has specifies Extended = Prefix TLV for IPv6.

 

Since there are two = separate RFCs for the Extended Prefix TLV, one for IPv4 and another one = for IPv6,  I was asking if the Sub-TLVs proposed for 5G Edge = Computing needs to have two separate drafts: one for IPv4 and another = one for IPv6?   Or just one draft to describe the extension to = both RFCs?

 

Your guidance is = greatly appreciated.

 

Linda

 

From: Acee Lindem (acee) = <acee@cisco.com> =
Sent: Wednesday, November 4, 2020 6:42 PM
To: Jeff = Tantsura <jefftant.ietf@gmail.com>; = Yingzhen Qu <yingzhen.ietf@gmail.com>; = lsr@ietf.org; lsr-chairs@ietf.org; Linda = Dunbar <linda.dunbar@futurewei.com= >
Subject: Re: [Lsr] Question on using OSFPv2 extended = Prefix TLV as the OSPF extension for 5G Edge Computing (was RE: IETF 109 = LSR Presentation Slot Requests

 

Exactly.

Thanks,
Acee

 

From: = Jeff Tantsura <jefftant.ietf@gmail.com>Date: Wednesday, November 4, 2020 at 6:16 PM
To: Acee = Lindem <acee@cisco.com>, = Yingzhen Qu <yingzhen.ietf@gmail.com>, = "lsr@ietf.org" <lsr@ietf.org>, "lsr-chairs@ietf.org" <lsr-chairs@ietf.org>, Linda = Dunbar <linda.dunbar@futurewei.com= >
Subject: Re: [Lsr] Question on using OSFPv2 extended = Prefix TLV as the OSPF extension for 5G Edge Computing (was RE: IETF 109 = LSR Presentation Slot Requests

 

For OSPFv3 use E-LSAs = (RFC8362)

 

Cheers,

Jeff

On Nov 4, 2020, 2:44 PM -0800, Linda Dunbar <linda.dunbar@futurewei.com= >, wrote:

Acee,

 

Thank you very much for = suggesting using the Prefix TLV for carry the Running Status and = environment of 5G Edge Computing servers.

 

In a nutshell, = the https://datatracker.ietf.org/doc/draft-dunbar-lsr-5g-edge-compute-o= spf-ext/ proposes the extension to LSA = that can carry the three SubTLVs that are used to represent the Running = Status and Environment information of the 5G Edge Computing Servers = attached to the router:

 

 =E2=80=A2 Load measurement = sub-TLV 

 =E2=80=A2 Capacity = Index  Sub-TLV             =                

 =E2=80=A2 Preference = Index  Sub-TLV              =                     =                 =  

 

Several sections of the = draft are devoted to describe what those measurement are and why need = them for 5G Edge Computing, which may have made it not so = straightforward when reading in a rush.

 

The Goal of the OSPF = extension is to carry those Sub-TLVs in the router=E2=80=99s LSA to be = advertised to other routers in the 5G Local Data Network.

 

If using your suggested = RFC7684 OSPFv2 Extended Prefix TLV, the extension does seem easier and = cleaner:

 

We can = have:

 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 = 0 1

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

| = Type                   =        | Length         =                |

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

| = Route Type    | Prefix Length | AF     =        | Flags        =  |

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

| = Address Prefix (variable)            =                     =      |

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+&n= bsp; 

| Load = Measurement Sub-TLV             =                     =      |

~                  =                     =                     =      ~

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+&n= bsp; 

| = capacity Index Sub-TLV             =                     =        |

~                  =                     =                     =      ~

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+&n= bsp; 

| Site = Preference Sub-TLV              =                     =      |

~                  =                     =                     =      ~  

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+&n= bsp; 

 

 

RFC7684 only has the = Extended Prefix TLV for IPv4. If the App Server addresses are in IPv6, = should we specify the extension to RFC8362 in the same draft? Or define = a new AF type for the same extension to RFC7684?

 

Your guidance is = greatly appreciated.

 

Thank you very = much.

 

Linda = Dunbar

 

 

From: Acee Lindem (acee) <acee@cisco.com>

Sent: Tuesday, November 3, 2020 1:38 = PM

To: Linda Dunbar <linda.dunbar@futurewei.com= >; Yingzhen Qu <yingzhen.ietf@gmail.com>; = lsr@ietf.org; lsr-chairs@ietf.org

Subject: Re: Need 10 minute slot to discuss OSPF extension for = 5G Edge Computing (was RE: [Lsr] IETF 109 LSR Presentation Slot = Requests

 

We have a pretty full schedule and we add you as optional. = I took a look at the draft and it is all over the place right now with = standardization requested for one solution but 3 separate solutions = partially specified. It could benefit from some WG mailing list = discussion prior to a 10 minute presentation where we wouldn=E2=80=99t = have time to discuss the many = issues.

 

One major issue is that you should be extending RFC 7684 = rather than RFC 3630 and it seems you these app-server selection metrics = should be associated with a prefix and NOT a stub link (i.e., the = application server = address).

 

I=E2=80=99ll try to read it in more depth before IETF = 109.

 

Thanks,

Acee

 

F= rom: Linda Dunbar <linda.dunbar@futurewei.com>

D= ate: Monday, November 2, 2020 at = 10:12 PM

T= o: Yingzhen Qu = <yingzhen.ietf@gmail.com>, = "lsr@ietf.org" = <lsr@ietf.org>, = "lsr-chairs@ietf.org" = <lsr-chairs@ietf.org>

S= ubject: Need 10 minute slot to = discuss OSPF extension for 5G Edge Computing (was RE: [Lsr] IETF 109 LSR = Presentation Slot Requests

R= esent-From: <alias-bounces@ietf.org>

R= esent-To: Yingzhen Qu = <yingzhen.ietf@gmail.com>, Acee Lindem = <acee@cisco.com>, Christian = Hopps <chopps@chopps.org>

R= esent-Date: Monday, November 2, 2020 at = 10:12 PM

 

LSR Chairs, = YingZhen,

 

Can you give us 10 minute slot to present this new = draft:

https://datatracker.ietf.org/doc/draft-dunbar-lsr-5g-ed= ge-compute-ospf-ext/

 

This draft describes an OSPF extension that can distribute = the 5G Edge Computing App running status and environment, so that other = routers in the 5G Local Data Network can make intelligent decision on = optimizing forwarding of flows from UEs. The goal is to improve latency = and performance for 5G Edge Computing = services.

 

Thank you very = much,

 

Linda Dunbar

 

From: Lsr <lsr-bounces@ietf.org> On Behalf = Of Yingzhen = Qu

Sent: Monday, October 19, 2020 3:52 = PM

To: lsr@ietf.org; lsr-chairs@ietf.org

Subject: [Lsr] IETF 109 LSR Presentation Slot = Requests

 

Hi all, 

 

We're now accepting agenda requests for the = LSR Working Grouping meeting IETF 109. Please send your requests = to lsr-chairs@ietf.org indicating draft name, speaker, and = desired duration (covering presentation and = discussion). 

 

LSR session is scheduled on Monday, Nov 16, = 12:00-14:00 ICT.

 

Thanks,

Yingzhen

_______________________________________________

Lsr mailing = list

Lsr@ietf.org

https://www.ietf.org/m= ailman/listinfo/lsr

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aer-iport-nat.cisco.com (HELO aer-core-2.cisco.com) ([173.38.203.22]) by aer-iport-3.cisco.com with ESMTP/TLS/DHE-RSA-SEED-SHA; 06 Nov 2020 17:55:37 +0000 Received: from [10.60.140.51] (ams-ppsenak-nitro2.cisco.com [10.60.140.51]) by aer-core-2.cisco.com (8.15.2/8.15.2) with ESMTP id 0A6HtaV6025608; Fri, 6 Nov 2020 17:55:37 GMT To: Aijun Wang Cc: Aijun Wang , "Acee Lindem (acee)" , lsr@ietf.org References: <204560AE-A58C-49C3-A882-2AE8FF145D0A@chinatelecom.cn> From: Peter Psenak Message-ID: <319f9938-f2b5-2f50-c4d0-7813c226847d@cisco.com> Date: Fri, 6 Nov 2020 18:55:36 +0100 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: <204560AE-A58C-49C3-A882-2AE8FF145D0A@chinatelecom.cn> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Outbound-SMTP-Client: 10.60.140.51, ams-ppsenak-nitro2.cisco.com X-Outbound-Node: aer-core-2.cisco.com Archived-At: Subject: Re: [Lsr] FW: New Version Notification for draft-wang-lsr-passive-interface-attribute-04.txt X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 06 Nov 2020 17:55:44 -0000 Aijun, On 05/11/2020 12:04, Aijun Wang wrote: > Hi, Peter: > Then how about defines one new top TLV to flood such information within the IGP? Fox example, Stub-Link TLV? If so, other characteristics associated with the Link can also be advertised accordingly. yes, unless you can use or extend the existing inter-AS link advertisement. thanks, Peter > > If acceptable, we can forward this draft along this direction. > > > Aijun Wang > China Telecom > >> On Nov 5, 2020, at 17:15, Peter Psenak wrote: >> >> Aijun, >> >> the point I was trying to make was that you should think of a similar mechanism for your use cases - e.g. define something that advertises the link without advertising the IS adjacency and not mess up with the prefix advertisement. >> >> thanks, >> Peter >> >>> On 05/11/2020 10:09, Aijun Wang wrote: >>> Hi, Peter: >>> Yes, RFC 5392 is the OSPF corresponding part for the inter-AS TE solution. But using these existing solutions has some limitation in deployment, as I explained in https://mailarchive.ietf.org/arch/msg/lsr/VLufuaGDiRgaflcu58FY_SHnJ7A/. >>> And, in some situations, not all of the passive interfaces are connected with another AS, then flag these interfaces using RFC 5316 or RFC 5392 is not appropriate. >>> Do you agree? >>> Best Regards >>> Aijun Wang >>> China Telecom >>> -----Original Message----- >>> From: ppsenak@cisco.com [mailto:ppsenak@cisco.com] >>> Sent: Thursday, November 5, 2020 4:26 PM >>> To: Aijun Wang ; 'Acee Lindem (acee)' ; 'Aijun Wang' >>> Cc: lsr@ietf.org >>> Subject: Re: [Lsr] FW: New Version Notification for draft-wang-lsr-passive-interface-attribute-04.txt >>> Hi Aijun, >>> please look at rfc5316, ISIS already have a way to advertise inter-AS link without forming an adjacency. >>> thanks, >>> Peter >>>> On 05/11/2020 02:15, Aijun Wang wrote: >>>> Hi, Acee: >>>> >>>> Thanks for this comments. >>>> The consideration for the position of flagging the passive interface have been stated in the updated 05 version https://tools.ietf.org/html/draft-wang-lsr-passive-interface-attribute-05#section-3, as the followings: >>>> >>>> ISIS [RFC5029] defines the Link-Attributes Sub-TLV to carry the link >>>> attribute information, but this Sub-TLV can only be carried within >>>> the TLV 22, which is used to described the attached neighbor. For >>>> passive interface, there is no ISIS neighbor, then it is not >>>> appropriate to use this Sub-TLV to indicate the passive attribute of >>>> the interface. >>>> >>>> OSPFv2[RFC2328] defines link type field within Router LSA, the type 3 >>>> for connections to a stub network can be used to identified the >>>> passive interface. But in OSPFv3 [RFC5340], type 3 within the >>>> Router-LSA has been reserved. The information that associated with >>>> stub network has been put in the Intra-Area-Prefix-LSAs. >>>> >>>> What about your opinions regarding to the above statements? Currently, we think putting the flag within the prefix attribute that associated the passive interface is appropriate. >>>> If we can find other appropriate/acceptable place to hold this information, we can also update the draft later accordingly. >>>> >>>> >>>> Best Regards >>>> >>>> Aijun Wang >>>> China Telecom >>>> >>>> >>>> -----Original Message----- >>>> From: Acee Lindem (acee) [mailto:acee@cisco.com] >>>> Sent: Thursday, November 5, 2020 4:11 AM >>>> To: Aijun Wang >>>> Cc: Aijun Wang ; Peter Psenak (ppsenak) >>>> ; lsr@ietf.org >>>> Subject: Re: [Lsr] FW: New Version Notification for >>>> draft-wang-lsr-passive-interface-attribute-04.txt >>>> >>>> Hi Aijun, >>>> You still didn't answer the question as to why you didn't rework this draft for passive interface to be an interface attribute rather than a prefix attribute? >>>> Thanks, >>>> Acee >>>> >>>>> On 10/1/20, 6:13 AM, "Acee Lindem (acee)" wrote: >>>> >>>> Hi Aijun, >>>> You didn't answer my question and pruned my message. Other than your attempt to expose the topology of areas outside the area, there is no other reason to associate the passive interface attribute with a prefix. We seem to be in a circular discussion.... >>>> Acee >>>> >>>>> On 9/30/20, 10:43 PM, "wangaj3@chinatelecom.cn on behalf of Aijun Wang" wrote: >>>> >>>> Hi, Acee: >>>> Except the corner cases of unnumbered interface, would you like to illustrate other scenarios that the process does not apply? >>>> As mentioned in last mail, knowing the passive interfaces can assist the nodes or controller know the boundaries of the network. >>>> >>>> Aijun Wang >>>> China Telecom >>>> >>>> > On Sep 30, 2020, at 19:47, Acee Lindem (acee) wrote: >>>> > >>>> >>>> >>>> >>>> >>>> _______________________________________________ >>>> Lsr mailing list >>>> Lsr@ietf.org >>>> https://www.ietf.org/mailman/listinfo/lsr >>>> >>>> >>> _______________________________________________ >>> Lsr mailing list >>> Lsr@ietf.org >>> https://www.ietf.org/mailman/listinfo/lsr >> > > > From nobody Fri Nov 6 13:22:50 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 9343B3A0D68; Fri, 6 Nov 2020 13:22:48 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.097 X-Spam-Level: X-Spam-Status: No, score=-2.097 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id zJX4wikxhVlQ; Fri, 6 Nov 2020 13:22:47 -0800 (PST) Received: from mail-io1-xd33.google.com (mail-io1-xd33.google.com [IPv6:2607:f8b0:4864:20::d33]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 49D9E3A0D67; Fri, 6 Nov 2020 13:22:47 -0800 (PST) Received: by mail-io1-xd33.google.com with SMTP id o11so2918426ioo.11; Fri, 06 Nov 2020 13:22:47 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:from:date:message-id:subject:to; bh=dR6ta8zQl1cYaVNnA72e5iJxI3YgnuN9ra76yKT7aqw=; b=g+IyNsovB4YHQf2TMgZvV0ObLHI4cFwMXxy/dl0bXoHRUk214UrT5J0OwEOXs9LaaM CCqMgb24mgUKgB3nU2fsIcRcUGmTEAOHdxzcd8Ip1Q1ZElBv2KRPeiIyFiY/cFFQYSY/ vllXbfGmGYaFgy0br0f/Xe4UamD13VjFwZ21um5BaGDo3BAD8fuXPJ6enEQ5dR38J1bN yEWTLTNp7+kuzssALafzTO+xK6aOfvuJw+Em10m+IdoVvqxTUmGUyvaQNmtj/DRN9Uac gaCTWhxcKMi7nur2il4MVuxfS5X8emBuYlkVvOE5rG8Azm9y7dDA0ZDJ8GGaRsIsIQvT Th8A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to; bh=dR6ta8zQl1cYaVNnA72e5iJxI3YgnuN9ra76yKT7aqw=; b=bDog/reGsc8HczmYX0QoAopyD6xG/V/rFJamzK83CcgjbFFbcdN6sKXTKdz24gxQto tCQ38BJs3J1fRaZS6ACK0F1I4QyWRJyK64uP9Na76soLYNYqoQPfMBrHe334ehfUVJDR Dx25ru7O4Kqchn20L/0kA9efwFGXL2fJ3jiQPnfs5z8D7msi/RxySW+8CKv6rKscplOK k8wf2OJDkGMKuokXJ7iqldJUMKiw4jS72NuQKbnd61h2j8/gxlJ9g/SbD+RC77x5r/gL eOt+wsnBHOgS4D8gYv8N10PFCicaNw1/MWeaOm19h0XqRA/LeXspZVwb9LSjINNNlLdF 1g9Q== X-Gm-Message-State: AOAM533/8YCunnFg98kENqwsseN15a9CVIeUerdTwxm+IqKlcVbJvnz1 nhCWSYpEdn1IOC1ntEl9jS/r9MpZjbTFqCA2057cWTU+1Q== X-Google-Smtp-Source: ABdhPJyuFjKnsO6+GYQtqAy5AMcil4YPdfpMeCx54sCvTM1hFMn2Y+UsZhhrWT9PLuLDllgoZUP+TPdalAG8ZlLMllc= X-Received: by 2002:a6b:8bcf:: with SMTP id n198mr2948872iod.122.1604697766256; Fri, 06 Nov 2020 13:22:46 -0800 (PST) MIME-Version: 1.0 From: Yingzhen Qu Date: Fri, 6 Nov 2020 13:22:35 -0800 Message-ID: To: lsr@ietf.org, lsr-chairs@ietf.org Content-Type: multipart/alternative; boundary="0000000000005463c805b376d05a" Archived-At: Subject: [Lsr] Draft LSR IETF 109 Agenda Available X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 06 Nov 2020 21:22:49 -0000 --0000000000005463c805b376d05a Content-Type: text/plain; charset="UTF-8" Hi all, The draft agenda for LSR meeting is available at: https://www.ietf.org/proceedings/109/agenda/agenda-109-lsr-01.html Please take a look and let us know if you have any questions or if we have missed anything. Presenters: Please send your slides to lsr-chairs@ietf.org no later than the Friday before our meeting. Thanks, Yingzhen --0000000000005463c805b376d05a Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi all,

The draft agenda for LSR meeting is available at:=C2=A0https://www.i= etf.org/proceedings/109/agenda/agenda-109-lsr-01.html=C2=A0
<= br>
Please take a look and let us know if=C2=A0you have any quest= ions or if we have=C2=A0missed anything.

Presenter= s:

Please send your slides to lsr-chairs@ietf.org no later than the Friday
be= fore our meeting.

Thanks,
Yi= ngzhen
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mail-m127101.qiye.163.com (mail-m127101.qiye.163.com [115.236.127.101]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id C1A483A1059; Sun, 8 Nov 2020 17:25:57 -0800 (PST) Received: from DESKTOP2IOH5QC (unknown [219.142.69.75]) by mail-m127101.qiye.163.com (Hmail) with ESMTPA id 0358F46ECB; Mon, 9 Nov 2020 09:25:52 +0800 (CST) From: "Aijun Wang" To: "'Linda Dunbar'" , "'Acee Lindem \(acee\)'" , "'Yingzhen Qu'" , , References: <016301d6b317$b7fd7870$27f86950$@tsinghua.org.cn> <008001d6b3db$085bc510$19134f30$@tsinghua.org.cn> In-Reply-To: Date: Mon, 9 Nov 2020 09:25:49 +0800 Message-ID: <021a01d6b637$426dffd0$c749ff70$@tsinghua.org.cn> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_021B_01D6B67A.5097CF80" X-Mailer: Microsoft Outlook 16.0 Thread-Index: AQD2J7U/Llv21jdkogB4O2EIjUtqHQHqhSVQAm1ltiIBgQu/TAJQ2yzeqz7PnjA= Content-Language: zh-cn X-HM-Spam-Status: e1kfGhgUHx5ZQUtXWQgYFAkeWUFZS1VLWVdZKFlBSkxLS0o3V1ktWUFJV1 kPCRoVCBIfWUFZS0lPGRgaHh1LSUtIVkpNS09DQ05KTkhPTUhVEwETFhoSFyQUDg9ZV1kWGg8SFR 0UWUFZT0tIVUpKS0hPQ1VLWQY+ X-HM-Sender-Digest: e1kMHhlZQR0aFwgeV1kSHx4VD1lBWUc6OBA6Ojo4Sj8eERM3CSkSQg0R LT8KFAxVSlVKTUtPQ0NOSk5PS0pJVTMWGhIXVQwaFRwaEhEOFTsPCBIVHBMOGlUUCRxVGBVFWVdZ EgtZQVlJSkJVSk9JVU1CVUxOWVdZCAFZQUxOS0JINwY+ X-HM-Tid: 0a75aa9c05c39865kuuu0358f46ecb Archived-At: Subject: Re: [Lsr] Question on using OSFPv2 extended Prefix TLV as the OSPF extension for 5G Edge Computing (was RE: IETF 109 LSR Presentation Slot Requests X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 09 Nov 2020 01:26:04 -0000 This is a multipart message in MIME format. ------=_NextPart_000_021B_01D6B67A.5097CF80 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi, Linda: =20 If the Load Measurement interval is 3600 seconds, I think it is = acceptable. But can such long interval meet the requirement of the edge = computing? And if the user specified one very short period, will it = influence the performance of SPF calculation on each router? =20 =20 Best Regards =20 Aijun Wang China Telecom =20 From: Linda Dunbar [mailto:linda.dunbar@futurewei.com]=20 Sent: Friday, November 6, 2020 10:45 PM To: Aijun Wang ; 'Acee Lindem (acee)' = ; 'Yingzhen Qu' ; lsr@ietf.org; = lsr-chairs@ietf.org Subject: RE: [Lsr] Question on using OSFPv2 extended Prefix TLV as the = OSPF extension for 5G Edge Computing (was RE: IETF 109 LSR Presentation = Slot Requests =20 Aijun,=20 =20 There are three Metrics to be collected for 5G Edge Computing servers, = to be carried by the three corresponding Sub-TLVs proposed by the = https://datatracker.ietf.org/doc/draft-dunbar-lsr-5g-edge-compute-ospf-ex= t/=20 =20 - IP-Layer Metric for App Server Load Measurement: Two types of Load Measurement Sub-TLVs are specified. One is to carry = the aggregated cost Index based on weighted combination of the collected = measurements; another one is to carry the raw measurements of = packets/bytes to/from the App Server address. The raw measurement is = useful when the egress routers cannot be configured with a consistent = algorithm to compute the aggregated load index and the raw measurements = are needed by a central analytic system. =20 - Capacity Index Capacity Index is used to differentiate the running environment of the = application server. Some data centers can have hundreds, or thousands, = of servers behind an Application Server=E2=80=99s App Layer Load = Balancer that is reachable from external world. Other data centers can = have very small number of servers for the application server. = =E2=80=9CCapacity Index=E2=80=9D, which is a numeric number, is used to = represent the capacity of the application server in a specific location. =20 - Site preference index:=20 [IPv6-StickyService] describes a scenario that some sites are more = preferred for handling an application than others for flows from a = specific UE.=20 =20 The Update frequency for the 3 sub-TLVs can be different. The Site = Preference Index and the Capacity Index should be in the same frequency = as the Extended Prefix TLV because as the Application Server Prefix = changes, their corresponding Site Preference and the Capacity Index = would change as well. =20 The Update frequency for the Load Measurement should be high to reflect = the running load of the App servers. Currently, default is 3600 seconds, = but can also be a user specified period in seconds.=20 =20 =20 Any other suggestions or comments?=20 =20 Linda Dunbar =20 From: Aijun Wang >=20 Sent: Thursday, November 5, 2020 7:21 PM To: Linda Dunbar >; 'Acee Lindem (acee)' = >; 'Yingzhen Qu' = >; = lsr@ietf.org ; lsr-chairs@ietf.org = =20 Subject: RE: [Lsr] Question on using OSFPv2 extended Prefix TLV as the = OSPF extension for 5G Edge Computing (was RE: IETF 109 LSR Presentation = Slot Requests =20 =20 Hi, Linda: =20 For example,=20 What=E2=80=99s the update frequency of the App server status data? Will = it influence the SPF efficiency on each flooding router etc.? =20 =20 Best Regards =20 Aijun Wang China Telecom =20 From: Linda Dunbar [mailto:linda.dunbar@futurewei.com]=20 Sent: Friday, November 6, 2020 12:57 AM To: Aijun Wang >; 'Acee Lindem (acee)' = >; 'Yingzhen Qu' = >; = lsr@ietf.org ; lsr-chairs@ietf.org = =20 Subject: RE: [Lsr] Question on using OSFPv2 extended Prefix TLV as the = OSPF extension for 5G Edge Computing (was RE: IETF 109 LSR Presentation = Slot Requests =20 Ai Jun,=20 =20 Can you elaborate more on your proposed =E2=80=9Canalysis for the = flooding influences=E2=80=9D?=20 =20 Thank you very much.=20 =20 Linda =20 From: Aijun Wang >=20 Sent: Wednesday, November 4, 2020 8:03 PM To: Linda Dunbar >; 'Acee Lindem (acee)' = >; 'Yingzhen Qu' = >; = lsr@ietf.org ; lsr-chairs@ietf.org = =20 Subject: RE: [Lsr] Question on using OSFPv2 extended Prefix TLV as the = OSPF extension for 5G Edge Computing (was RE: IETF 109 LSR Presentation = Slot Requests =20 Hi, Linda: =20 Is it better to add some analysis for the flooding influences on the = router performance when we add such dynamic information within the IGP = protocol? =20 =20 Best Regards =20 Aijun Wang China Telecom =20 From: lsr-bounces@ietf.org = [mailto:lsr-bounces@ietf.org] On Behalf Of Linda Dunbar Sent: Thursday, November 5, 2020 6:44 AM To: Acee Lindem (acee) >; = Yingzhen Qu >; = lsr@ietf.org ; lsr-chairs@ietf.org = =20 Subject: [Lsr] Question on using OSFPv2 extended Prefix TLV as the OSPF = extension for 5G Edge Computing (was RE: IETF 109 LSR Presentation Slot = Requests =20 Acee,=20 =20 Thank you very much for suggesting using the Prefix TLV for carry the = Running Status and environment of 5G Edge Computing servers.=20 =20 In a nutshell, the = https://datatracker.ietf.org/doc/draft-dunbar-lsr-5g-edge-compute-ospf-ex= t/ = proposes the extension to LSA that can carry the = three SubTLVs that are used to represent the Running Status and = Environment information of the 5G Edge Computing Servers attached to the = router: =20 =C3=98 Load measurement sub-TLV =20 =C3=98 Capacity Index Sub-TLV =20 =C3=98 Preference Index Sub-TLV = =20 =20 Several sections of the draft are devoted to describe what those = measurement are and why need them for 5G Edge Computing, which may have = made it not so straightforward when reading in a rush.=20 =20 The Goal of the OSPF extension is to carry those Sub-TLVs in the = router=E2=80=99s LSA to be advertised to other routers in the 5G Local = Data Network.=20 =20 If using your suggested RFC7684 OSPFv2 Extended Prefix TLV, the = extension does seem easier and cleaner:=20 =20 We can have:=20 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Type | Length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Route Type | Prefix Length | AF | Flags | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Address Prefix (variable) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ =20 | Load Measurement Sub-TLV |=20 ~ ~=20 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ =20 | capacity Index Sub-TLV |=20 ~ ~=20 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ =20 | Site Preference Sub-TLV |=20 ~ ~ =20 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ =20 =20 =20 RFC7684 only has the Extended Prefix TLV for IPv4. If the App Server = addresses are in IPv6, should we specify the extension to RFC8362 in the = same draft? Or define a new AF type for the same extension to RFC7684?=20 =20 Your guidance is greatly appreciated.=20 =20 Thank you very much.=20 =20 Linda Dunbar =20 =20 From: Acee Lindem (acee) >=20 Sent: Tuesday, November 3, 2020 1:38 PM To: Linda Dunbar >; Yingzhen Qu = >; = lsr@ietf.org ; lsr-chairs@ietf.org = =20 Subject: Re: Need 10 minute slot to discuss OSPF extension for 5G Edge = Computing (was RE: [Lsr] IETF 109 LSR Presentation Slot Requests =20 We have a pretty full schedule and we add you as optional. I took a look = at the draft and it is all over the place right now with standardization = requested for one solution but 3 separate solutions partially specified. = It could benefit from some WG mailing list discussion prior to a 10 = minute presentation where we wouldn=E2=80=99t have time to discuss the = many issues.=20 =20 One major issue is that you should be extending RFC 7684 rather than RFC = 3630 and it seems you these app-server selection metrics should be = associated with a prefix and NOT a stub link (i.e., the application = server address). =20 I=E2=80=99ll try to read it in more depth before IETF 109.=20 =20 Thanks, Acee =20 From: Linda Dunbar > Date: Monday, November 2, 2020 at 10:12 PM To: Yingzhen Qu >, "lsr@ietf.org = " >, "lsr-chairs@ietf.org = " > Subject: Need 10 minute slot to discuss OSPF extension for 5G Edge = Computing (was RE: [Lsr] IETF 109 LSR Presentation Slot Requests Resent-From: > Resent-To: Yingzhen Qu >, Acee Lindem >, Christian Hopps > Resent-Date: Monday, November 2, 2020 at 10:12 PM =20 LSR Chairs, YingZhen,=20 =20 Can you give us 10 minute slot to present this new draft: https://datatracker.ietf.org/doc/draft-dunbar-lsr-5g-edge-compute-ospf-ex= t/ = =20 =20 This draft describes an OSPF extension that can distribute the 5G Edge = Computing App running status and environment, so that other routers in = the 5G Local Data Network can make intelligent decision on optimizing = forwarding of flows from UEs. The goal is to improve latency and = performance for 5G Edge Computing services.=20 =20 Thank you very much,=20 =20 Linda Dunbar =20 From: Lsr > On = Behalf Of Yingzhen Qu Sent: Monday, October 19, 2020 3:52 PM To: lsr@ietf.org ; lsr-chairs@ietf.org = =20 Subject: [Lsr] IETF 109 LSR Presentation Slot Requests =20 Hi all,=20 =20 We're now accepting agenda requests for the LSR Working Grouping meeting = IETF 109. Please send your requests to = lsr-chairs@ietf.org indicating draft name, speaker, and desired duration = (covering presentation and discussion).=20 =20 LSR session is scheduled on Monday, Nov 16, 12:00-14:00 ICT. =20 Thanks, Yingzhen ------=_NextPart_000_021B_01D6B67A.5097CF80 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

H= i, Linda:

<= o:p> 

I= f the Load Measurement interval is 3600 seconds, I think it is = acceptable. But can such long interval meet the requirement of the edge = computing? And if the user specified one very short period, will it = influence the performance of SPF calculation on each = router?

<= o:p> 

<= o:p> 

B= est Regards

<= o:p> 

A= ijun Wang

C= hina Telecom<= o:p>

<= o:p> 

From: Linda Dunbar = [mailto:linda.dunbar@futurewei.com]
Sent: Friday, November 6, = 2020 10:45 PM
To: Aijun Wang = <wangaijun@tsinghua.org.cn>; 'Acee Lindem (acee)' = <acee@cisco.com>; 'Yingzhen Qu' <yingzhen.ietf@gmail.com>; = lsr@ietf.org; lsr-chairs@ietf.org
Subject: RE: [Lsr] Question = on using OSFPv2 extended Prefix TLV as the OSPF extension for 5G Edge = Computing (was RE: IETF 109 LSR Presentation Slot = Requests

 

Aijun,

 

There are three Metrics to be collected for 5G Edge = Computing servers, to be carried by the three corresponding =  Sub-TLVs proposed by the https://datatracker.ietf.org/doc/draft-dunbar-lsr-5g-edge-com= pute-ospf-ext/

 

-   IP-Layer Metric for = App Server Load Measurement:

Two types of Load = Measurement Sub-TLVs are specified. One is to carry the aggregated cost = Index based on weighted combination of the collected measurements; = another one is to carry the raw measurements of packets/bytes to/from = the App Server address. The raw measurement is useful when the egress = routers cannot be configured with a consistent algorithm to compute the = aggregated load index and the raw measurements are needed by a central = analytic system.

 

-   Capacity = Index

Capacity Index is = used to differentiate the running environment of the application server. = Some data centers can have hundreds, or thousands, of servers behind an = Application Server=E2=80=99s App Layer Load Balancer that is reachable = from external world. Other data centers can have very small number of = servers for the application server. =E2=80=9CCapacity Index=E2=80=9D, = which is a numeric number, is used to represent the capacity of the = application server in a specific location.

 

-   Site preference = index:

[IPv6-StickyService] describes a scenario that some sites = are more preferred for handling an application than others for flows = from a specific UE.

 

The Update frequency for the 3 sub-TLVs can be different. = The Site Preference Index and the Capacity Index should be in the same = frequency as the Extended Prefix TLV because as the Application Server = Prefix changes, their corresponding Site Preference and the Capacity = Index would change as well. 

The Update frequency for the Load Measurement should be = high to reflect the running load of the App servers. Currently, default = is 3600 seconds, but can also be a user specified period in seconds. =

 

 

Any other suggestions or comments?

 

Linda Dunbar

 

From: Aijun Wang <wangaijun@tsinghua.org.cn&g= t;
Sent: Thursday, November 5, 2020 7:21 PM
To: = Linda Dunbar <linda.dunbar@futurewei.com= >; 'Acee Lindem (acee)' <acee@cisco.com>; 'Yingzhen Qu' = <yingzhen.ietf@gmail.com>; = lsr@ietf.org; lsr-chairs@ietf.org
Subject= : RE: [Lsr] Question on using OSFPv2 extended Prefix TLV as the OSPF = extension for 5G Edge Computing (was RE: IETF 109 LSR Presentation Slot = Requests

 

<= o:p> 

H= i, Linda:

<= o:p> 

F= or example,

W= hat=E2= =80=99s the update frequency of the App server status = data?  Will it influence the SPF efficiency on each flooding router = etc.?

<= o:p> 

<= o:p> 

B= est Regards

<= o:p> 

A= ijun Wang

C= hina Telecom

<= o:p> 

From: Linda Dunbar [mailto:linda.dunbar@futurewei.= com]
Sent: Friday, November 6, 2020 12:57 = AM
To: Aijun Wang <wangaijun@tsinghua.org.cn&g= t;; 'Acee Lindem (acee)' <acee@cisco.com>; 'Yingzhen Qu' = <yingzhen.ietf@gmail.com>; = lsr@ietf.org; lsr-chairs@ietf.org
Subject= : RE: [Lsr] Question on using OSFPv2 extended Prefix TLV as the OSPF = extension for 5G Edge Computing (was RE: IETF 109 LSR Presentation Slot = Requests

 

Ai Jun,

 

Can you elaborate more on your proposed =E2=80=9Canalysis = for the flooding influences=E2=80=9D?

 

Thank you very much.

 

Linda

 

From: Aijun Wang <wangaijun@tsinghua.org.cn&g= t;
Sent: Wednesday, November 4, 2020 8:03 PM
To: = Linda Dunbar <linda.dunbar@futurewei.com= >; 'Acee Lindem (acee)' <acee@cisco.com>; 'Yingzhen Qu' = <yingzhen.ietf@gmail.com>; = lsr@ietf.org; lsr-chairs@ietf.org
Subject= : RE: [Lsr] Question on using OSFPv2 extended Prefix TLV as the OSPF = extension for 5G Edge Computing (was RE: IETF 109 LSR Presentation Slot = Requests

 

H= i, Linda:

<= o:p> 

I= s it better to add some analysis for the flooding influences on the = router performance when we add such dynamic information within the IGP = protocol?

<= o:p> 

<= o:p> 

B= est Regards

<= o:p> 

A= ijun Wang

C= hina Telecom

<= o:p> 

From: lsr-bounces@ietf.org [mailto:lsr-bounces@ietf.org] = On Behalf Of Linda Dunbar
Sent: Thursday, November 5, = 2020 6:44 AM
To: Acee Lindem (acee) <acee@cisco.com>; Yingzhen Qu = <yingzhen.ietf@gmail.com>; = lsr@ietf.org; lsr-chairs@ietf.org
Subject= : [Lsr] Question on using OSFPv2 extended Prefix TLV as the OSPF = extension for 5G Edge Computing (was RE: IETF 109 LSR Presentation Slot = Requests

 

Acee, =

 

Thank you very much for = suggesting using the Prefix TLV for carry the Running Status and = environment of 5G Edge Computing servers.

 

In a nutshell, the https://datatracker.ietf.org/doc/= draft-dunbar-lsr-5g-edge-compute-ospf-ext/ proposes the extension to = LSA that can carry the three SubTLVs that are used to represent the = Running Status and Environment information of the 5G Edge Computing = Servers attached to the router:

 

=C3=98  Load measurement sub-TLV  =

=C3=98  Capacity Index =  Sub-TLV          =             &= nbsp;     

=C3=98  Preference Index  = Sub-TLV           =             &= nbsp;  =             &= nbsp;           &n= bsp;

 

Several sections of the = draft are devoted to describe what those measurement are and why need = them for 5G Edge Computing, which may have made it not so = straightforward when reading in a rush.

 

The Goal of the OSPF = extension is to carry those Sub-TLVs in the router=E2=80=99s LSA to be = advertised to other routers in the 5G Local Data Network. =

 

If using your suggested = RFC7684 OSPFv2 Extended Prefix TLV, the extension does seem easier and = cleaner:

 

We can have: =

 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 = 0 1

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

| = Type           &nb= sp;           &nbs= p;  | Length =             &= nbsp;          |

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

| Route Type    | Prefix Length | AF =            | = Flags        =  |

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

| Address Prefix (variable) =             &= nbsp;           &n= bsp;           |

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+&n= bsp; 

| Load = Measurement = Sub-TLV           =             &= nbsp;           &n= bsp;  |

~           =             &= nbsp;           &n= bsp;           &nb= sp;           &nbs= p;   ~

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+&n= bsp; 

| = capacity Index = Sub-TLV           =      =             &= nbsp;           | =

~           =             &= nbsp;           &n= bsp;           &nb= sp;           &nbs= p;   ~

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+&n= bsp; 

| Site = Preference = Sub-TLV           =   =             &= nbsp;           &n= bsp; |

~           =             &= nbsp;           &n= bsp;           &nb= sp;           &nbs= p;   ~  

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+&n= bsp; 

 

 

RFC7684 only has the = Extended Prefix TLV for IPv4. If the App Server addresses are in IPv6, = should we specify the extension to RFC8362 in the same draft? Or define = a new AF type for the same extension to RFC7684? =

 

Your guidance is = greatly appreciated.

 

Thank you very much. =

 

Linda = Dunbar

 

 

From: Acee Lindem (acee) = <acee@cisco.com> =
Sent: Tuesday, November 3, 2020 1:38 PM
To: Linda = Dunbar <linda.dunbar@futurewei.com= >; Yingzhen Qu <yingzhen.ietf@gmail.com>; = lsr@ietf.org; lsr-chairs@ietf.org
Subject= : Re: Need 10 minute slot to discuss OSPF extension for 5G Edge = Computing (was RE: [Lsr] IETF 109 LSR Presentation Slot = Requests

 

We have a pretty full schedule and we add you as optional. = I took a look at the draft and it is all over the place right now with = standardization requested for one solution but 3 separate solutions = partially specified. It could benefit from some WG mailing list = discussion prior to a 10 minute presentation where we wouldn=E2=80=99t = have time to discuss the many issues.

 

One major issue is that you should be extending RFC 7684 = rather than RFC 3630 and it seems you these app-server selection metrics = should be associated with a prefix and NOT a stub link (i.e., the = application server address).

 

I=E2=80=99ll try to read it in more depth before IETF 109. =

 

Thanks,
Acee

 

From: = Linda Dunbar <linda.dunbar@futurewei.com= >
Date: Monday, November 2, 2020 at 10:12 PM
To: = Yingzhen Qu <yingzhen.ietf@gmail.com>, = "lsr@ietf.org" <lsr@ietf.org>, "lsr-chairs@ietf.org" <lsr-chairs@ietf.org>
Sub= ject: Need 10 minute slot to discuss OSPF extension for 5G Edge = Computing (was RE: [Lsr] IETF 109 LSR Presentation Slot = Requests
Resent-From: <alias-bounces@ietf.org>
= Resent-To: Yingzhen Qu <yingzhen.ietf@gmail.com>, = Acee Lindem <acee@cisco.com>, Christian Hopps = <chopps@chopps.org>
Resent-= Date: Monday, November 2, 2020 at 10:12 = PM

 

LSR Chairs, YingZhen,

 

Can you give us 10 minute slot to present this new = draft:

https://datatracker.ietf.org/doc/draf= t-dunbar-lsr-5g-edge-compute-ospf-ext/

 

This draft describes = an OSPF extension that can distribute the 5G = Edge Computing App running status and environment, so that other routers = in the 5G Local Data Network can make intelligent decision on optimizing = forwarding of flows from UEs. The goal is to improve latency and = performance for 5G Edge Computing services.

 

Thank you very much,

 

Linda Dunbar

 

From: Lsr <lsr-bounces@ietf.org> On = Behalf Of Yingzhen Qu
Sent: Monday, October 19, 2020 3:52 = PM
To: lsr@ietf.org; lsr-chairs@ietf.org
Subject= : [Lsr] IETF 109 LSR Presentation Slot = Requests

 

Hi all, 

 

We're now accepting agenda requests for the = LSR Working Grouping meeting IETF 109. Please send your requests = to lsr-chairs@ietf.org indicating = draft name, speaker, and desired duration (covering presentation and = discussion). 

 

LSR session is scheduled on Monday, Nov 16, = 12:00-14:00 ICT.

 

Thanks,

Yingzhen

------=_NextPart_000_021B_01D6B67A.5097CF80-- From nobody Sun Nov 8 17:27:27 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D6E163A105B; Sun, 8 Nov 2020 17:27:25 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.796 X-Spam-Level: X-Spam-Status: No, score=-1.796 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, HTTPS_HTTP_MISMATCH=0.1, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=no autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id HWnMrjzLXW9a; Sun, 8 Nov 2020 17:27:23 -0800 (PST) Received: from mail-m127101.qiye.163.com (mail-m127101.qiye.163.com [115.236.127.101]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 9A6EA3A1059; Sun, 8 Nov 2020 17:27:13 -0800 (PST) Received: from DESKTOP2IOH5QC (unknown [219.142.69.75]) by mail-m127101.qiye.163.com (Hmail) with ESMTPA id B379947708; Mon, 9 Nov 2020 09:27:08 +0800 (CST) From: "Aijun Wang" To: "'Linda Dunbar'" , "'Acee Lindem \(acee\)'" , "'Peter Psenak'" , "'Jeff Tantsura'" , "'Yingzhen Qu'" , , References: <9af88324-b117-4272-b21d-29002f9183fd@Spark> <75281559-0A10-4F81-B358-AAE2CBA0DE2B@cisco.com> <008a01d6b3dd$07c3b8e0$174b2aa0$@tsinghua.org.cn> In-Reply-To: Date: Mon, 9 Nov 2020 09:27:05 +0800 Message-ID: <021f01d6b637$6fa04800$4ee0d800$@tsinghua.org.cn> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0220_01D6B67A.7DCB2920" X-Mailer: Microsoft Outlook 16.0 Thread-Index: AQD2J7U/Llv21jdkogB4O2EIjUtqHQNgqO6mAg0tJwcCMsHvUAK3frvvAjAhIY6rG91jsA== Content-Language: zh-cn X-HM-Spam-Status: e1kfGhgUHx5ZQUtXWQgYFAkeWUFZS1VLWVdZKFlBSkxLS0o3V1ktWUFJV1 kPCRoVCBIfWUFZS0xCHxpCSEgZThpMVkpNS09DQ05JSUJJQ0xVEwETFhoSFyQUDg9ZV1kWGg8SFR 0UWUFZT0tIVUpKS09ISFVLWQY+ X-HM-Sender-Digest: e1kMHhlZQR0aFwgeV1kSHx4VD1lBWUc6MSI6SCo5Fz8uLxNJGSgoQgw2 CDZPClZVSlVKTUtPQ0NOSUlCQkxPVTMWGhIXVQwaFRwaEhEOFTsPCBIVHBMOGlUUCRxVGBVFWVdZ EgtZQVlJSkJVSk9JVU1CVUxOWVdZCAFZQUNOTU1ONwY+ X-HM-Tid: 0a75aa9d2df89865kuuub379947708 Archived-At: Subject: Re: [Lsr] Question on using OSFPv2 extended Prefix TLV as the OSPF extension for 5G Edge Computing (was RE: IETF 109 LSR Presentation Slot Requests X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 09 Nov 2020 01:27:26 -0000 This is a multipart message in MIME format. ------=_NextPart_000_0220_01D6B67A.7DCB2920 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi, Linda: =20 From: Linda Dunbar [mailto:linda.dunbar@futurewei.com]=20 Sent: Saturday, November 7, 2020 1:27 AM To: Aijun Wang ; 'Acee Lindem (acee)' = ; 'Peter Psenak' ; = 'Jeff Tantsura' ; 'Yingzhen Qu' = ; lsr@ietf.org; lsr-chairs@ietf.org Subject: RE: [Lsr] Question on using OSFPv2 extended Prefix TLV as the = OSPF extension for 5G Edge Computing (was RE: IETF 109 LSR Presentation = Slot Requests =20 Aijun,=20 =20 I read through your draft, need to clarify a few things: =20 1. Is your =E2=80=9CPassive Link=E2=80=9D same as the = =E2=80=9CStub Link=E2=80=9D?=20 [WAJ] Yes. 2. Are you suggesting that the =E2=80=9CPassive Link=E2=80=9D to = be advertised less often than the regular LSA?=20 [WAJ] No. It is same. =20 Thank you,=20 =20 Linda =20 From: Aijun Wang >=20 Sent: Thursday, November 5, 2020 7:35 PM To: Linda Dunbar >; 'Acee Lindem (acee)' = >; 'Peter Psenak' = >; 'Jeff Tantsura' = >; 'Yingzhen = Qu' >; = lsr@ietf.org ; lsr-chairs@ietf.org = =20 Subject: RE: [Lsr] Question on using OSFPv2 extended Prefix TLV as the = OSPF extension for 5G Edge Computing (was RE: IETF 109 LSR Presentation = Slot Requests =20 Hi, Linda, Acee, Jeff and Peter: =20 >From this use case, together with another = draft(https://datatracker.ietf.org/doc/draft-wang-lsr-passive-interface-a= ttribute/ = ) that we are proposing and discussing, as in = https://mailarchive.ietf.org/arch/msg/lsr/imojDOsS3W3B2H2SbmUT0QKjbxM/ = =20 It is more convincible to define one new top TLV, for example, Stub-Link = TLV, to contain your current proposed sub-TLV, and other futures = information. =20 The information contained within the Stub-Link TLV, will not participate = the SPF calculation on each router. =20 It is more clear than to put this information associated with the Prefix = TLV. =20 =20 Best Regards =20 Aijun Wang China Telecom =20 =20 From: lsr-bounces@ietf.org = [mailto:lsr-bounces@ietf.org] On Behalf Of Linda Dunbar Sent: Friday, November 6, 2020 12:04 AM To: Acee Lindem (acee) >; Jeff = Tantsura >; = Yingzhen Qu >; = lsr@ietf.org ; lsr-chairs@ietf.org = =20 Subject: Re: [Lsr] Question on using OSFPv2 extended Prefix TLV as the = OSPF extension for 5G Edge Computing (was RE: IETF 109 LSR Presentation = Slot Requests =20 Jeff and Acee,=20 =20 I understand that RFC8362 has specifies Extended Prefix TLV for IPv6. =20 Since there are two separate RFCs for the Extended Prefix TLV, one for = IPv4 and another one for IPv6, I was asking if the Sub-TLVs proposed = for 5G Edge Computing needs to have two separate drafts: one for IPv4 = and another one for IPv6? Or just one draft to describe the extension = to both RFCs?=20 =20 Your guidance is greatly appreciated.=20 =20 Linda =20 From: Acee Lindem (acee) >=20 Sent: Wednesday, November 4, 2020 6:42 PM To: Jeff Tantsura >; Yingzhen Qu >; lsr@ietf.org ; = lsr-chairs@ietf.org ; Linda Dunbar = > Subject: Re: [Lsr] Question on using OSFPv2 extended Prefix TLV as the = OSPF extension for 5G Edge Computing (was RE: IETF 109 LSR Presentation = Slot Requests =20 Exactly.=20 Thanks, Acee =20 From: Jeff Tantsura > Date: Wednesday, November 4, 2020 at 6:16 PM To: Acee Lindem >, Yingzhen Qu = >, = "lsr@ietf.org " >, "lsr-chairs@ietf.org = " >, Linda Dunbar > Subject: Re: [Lsr] Question on using OSFPv2 extended Prefix TLV as the = OSPF extension for 5G Edge Computing (was RE: IETF 109 LSR Presentation = Slot Requests =20 For OSPFv3 use E-LSAs (RFC8362) =20 Cheers,=20 Jeff On Nov 4, 2020, 2:44 PM -0800, Linda Dunbar >, wrote: Acee, =20 Thank you very much for suggesting using the Prefix TLV for carry the = Running Status and environment of 5G Edge Computing servers. =20 In a nutshell, the = = https://datatracker.ietf.org/doc/draft-dunbar-lsr-5g-edge-compute-ospf-ex= t/ proposes the extension to LSA that can carry the three SubTLVs that = are used to represent the Running Status and Environment information of = the 5G Edge Computing Servers attached to the router: =20 =E2=80=A2 Load measurement sub-TLV=20 =E2=80=A2 Capacity Index Sub-TLV =20 =E2=80=A2 Preference Index Sub-TLV = =20 =20 Several sections of the draft are devoted to describe what those = measurement are and why need them for 5G Edge Computing, which may have = made it not so straightforward when reading in a rush. =20 The Goal of the OSPF extension is to carry those Sub-TLVs in the = router=E2=80=99s LSA to be advertised to other routers in the 5G Local = Data Network. =20 If using your suggested RFC7684 OSPFv2 Extended Prefix TLV, the = extension does seem easier and cleaner: =20 We can have: 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Type | Length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Route Type | Prefix Length | AF | Flags | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Address Prefix (variable) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ =20 | Load Measurement Sub-TLV | ~ ~ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ =20 | capacity Index Sub-TLV | ~ ~ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ =20 | Site Preference Sub-TLV | ~ ~ =20 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ =20 =20 =20 RFC7684 only has the Extended Prefix TLV for IPv4. If the App Server = addresses are in IPv6, should we specify the extension to RFC8362 in the = same draft? Or define a new AF type for the same extension to RFC7684? =20 Your guidance is greatly appreciated. =20 Thank you very much. =20 Linda Dunbar =20 =20 From: Acee Lindem (acee) > Sent: Tuesday, November 3, 2020 1:38 PM To: Linda Dunbar >; Yingzhen Qu = >; = lsr@ietf.org ; lsr-chairs@ietf.org = =20 Subject: Re: Need 10 minute slot to discuss OSPF extension for 5G Edge = Computing (was RE: [Lsr] IETF 109 LSR Presentation Slot Requests =20 We have a pretty full schedule and we add you as optional. I took a look = at the draft and it is all over the place right now with standardization = requested for one solution but 3 separate solutions partially specified. = It could benefit from some WG mailing list discussion prior to a 10 = minute presentation where we wouldn=E2=80=99t have time to discuss the = many issues. =20 One major issue is that you should be extending RFC 7684 rather than RFC = 3630 and it seems you these app-server selection metrics should be = associated with a prefix and NOT a stub link (i.e., the application = server address). =20 I=E2=80=99ll try to read it in more depth before IETF 109. =20 Thanks, Acee =20 From: Linda Dunbar < = linda.dunbar@futurewei.com> Date: Monday, November 2, 2020 at 10:12 PM To: Yingzhen Qu < = yingzhen.ietf@gmail.com>, " lsr@ietf.org" < = lsr@ietf.org>, " = lsr-chairs@ietf.org" < lsr-chairs@ietf.org> Subject: Need 10 minute slot to discuss OSPF extension for 5G Edge = Computing (was RE: [Lsr] IETF 109 LSR Presentation Slot Requests Resent-From: < alias-bounces@ietf.org> Resent-To: Yingzhen Qu < = yingzhen.ietf@gmail.com>, Acee Lindem < = acee@cisco.com>, Christian Hopps < = chopps@chopps.org> Resent-Date: Monday, November 2, 2020 at 10:12 PM =20 LSR Chairs, YingZhen, =20 Can you give us 10 minute slot to present this new draft: https://datatracker.ietf.org/doc/draft-dunbar-lsr-5g-edge-compute-ospf-ex= t/ = =20 =20 This draft describes an OSPF extension that can distribute the 5G Edge = Computing App running status and environment, so that other routers in = the 5G Local Data Network can make intelligent decision on optimizing = forwarding of flows from UEs. The goal is to improve latency and = performance for 5G Edge Computing services. =20 Thank you very much, =20 Linda Dunbar =20 From: Lsr > On = Behalf Of Yingzhen Qu Sent: Monday, October 19, 2020 3:52 PM To: lsr@ietf.org ; lsr-chairs@ietf.org = =20 Subject: [Lsr] IETF 109 LSR Presentation Slot Requests =20 Hi all,=20 =20 We're now accepting agenda requests for the LSR Working Grouping meeting = IETF 109. Please send your requests to = lsr-chairs@ietf.org indicating draft name, speaker, and desired duration = (covering presentation and discussion).=20 =20 LSR session is scheduled on Monday, Nov 16, 12:00-14:00 ICT. =20 Thanks, Yingzhen _______________________________________________ Lsr mailing list Lsr@ietf.org =20 https://www.ietf.org/mailman/listinfo/lsr = =20 ------=_NextPart_000_0220_01D6B67A.7DCB2920 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

H= i, Linda:

<= o:p> 

From: Linda Dunbar = [mailto:linda.dunbar@futurewei.com]
Sent: Saturday, November = 7, 2020 1:27 AM
To: Aijun Wang = <wangaijun@tsinghua.org.cn>; 'Acee Lindem (acee)' = <acee@cisco.com>; 'Peter Psenak' = <ppsenak=3D40cisco.com@dmarc.ietf.org>; 'Jeff Tantsura' = <jefftant.ietf@gmail.com>; 'Yingzhen Qu' = <yingzhen.ietf@gmail.com>; lsr@ietf.org; = lsr-chairs@ietf.org
Subject: RE: [Lsr] Question on using = OSFPv2 extended Prefix TLV as the OSPF extension for 5G Edge Computing = (was RE: IETF 109 LSR Presentation Slot = Requests

 

Aijun,

 

I read through your draft, need to clarify a few = things:

 

1.       = Is your = =E2=80=9CPassive Link=E2=80=9D same as the =E2=80=9CStub Link=E2=80=9D? =

[= WAJ] Yes.<= o:p>

2.       = Are you suggesting that the = =E2=80=9CPassive Link=E2=80=9D to be advertised less often than the = regular LSA?

[= WAJ] No. It is same.<= o:p>

 

Thank you,

 

Linda

 

From: Aijun Wang <wangaijun@tsinghua.org.cn&g= t;
Sent: Thursday, November 5, 2020 7:35 PM
To: = Linda Dunbar <linda.dunbar@futurewei.com= >; 'Acee Lindem (acee)' <acee@cisco.com>; 'Peter Psenak' = <ppsenak=3D40cisco.co= m@dmarc.ietf.org>; 'Jeff Tantsura' <jefftant.ietf@gmail.com>; = 'Yingzhen Qu' <yingzhen.ietf@gmail.com>; = lsr@ietf.org; lsr-chairs@ietf.org
Subject= : RE: [Lsr] Question on using OSFPv2 extended Prefix TLV as the OSPF = extension for 5G Edge Computing (was RE: IETF 109 LSR Presentation Slot = Requests

 

H= i, Linda, Acee, Jeff and Peter:

<= o:p> 

F= rom this use case, together with another draft(https://datatracker.ietf.org/doc/d= raft-wang-lsr-passive-interface-attribute/) that we are proposing = and discussing, as in https://mailarchive.ietf.org/arch/msg/= lsr/imojDOsS3W3B2H2SbmUT0QKjbxM/

I= t is more convincible to define one new top TLV, for example, Stub-Link = TLV, to contain your current proposed sub-TLV, and other futures = information.

<= o:p> 

T= he information contained within the Stub-Link TLV, will not participate = the SPF calculation on each router.  

I= t is more clear than to put this information associated with the Prefix = TLV.

<= o:p> 

<= o:p> 

B= est Regards

<= o:p> 

A= ijun Wang

C= hina Telecom

<= o:p> 

<= o:p> 

From: lsr-bounces@ietf.org [mailto:lsr-bounces@ietf.org] = On Behalf Of Linda Dunbar
Sent: Friday, November 6, = 2020 12:04 AM
To: Acee Lindem (acee) <acee@cisco.com>; Jeff Tantsura = <jefftant.ietf@gmail.com>; = Yingzhen Qu <yingzhen.ietf@gmail.com>; = lsr@ietf.org; lsr-chairs@ietf.org
Subject= : Re: [Lsr] Question on using OSFPv2 extended Prefix TLV as the OSPF = extension for 5G Edge Computing (was RE: IETF 109 LSR Presentation Slot = Requests

 

Jeff and Acee,

 

I understand that RFC8362 has specifies Extended = Prefix TLV for IPv6.

 

Since there are two = separate RFCs for the Extended Prefix TLV, one for IPv4 and another one = for IPv6,  I was asking if the Sub-TLVs proposed for 5G Edge = Computing needs to have two separate drafts: one for IPv4 and another = one for IPv6?   Or just one draft to describe the extension to = both RFCs?

 

Your guidance is = greatly appreciated.

 

Linda

 

From: Acee Lindem (acee) = <acee@cisco.com> =
Sent: Wednesday, November 4, 2020 6:42 PM
To: Jeff = Tantsura <jefftant.ietf@gmail.com>; = Yingzhen Qu <yingzhen.ietf@gmail.com>; = lsr@ietf.org; lsr-chairs@ietf.org; Linda = Dunbar <linda.dunbar@futurewei.com= >
Subject: Re: [Lsr] Question on using OSFPv2 extended = Prefix TLV as the OSPF extension for 5G Edge Computing (was RE: IETF 109 = LSR Presentation Slot Requests

 

Exactly.

Thanks,
Acee

 

From: = Jeff Tantsura <jefftant.ietf@gmail.com>Date: Wednesday, November 4, 2020 at 6:16 PM
To: Acee = Lindem <acee@cisco.com>, = Yingzhen Qu <yingzhen.ietf@gmail.com>, = "lsr@ietf.org" <lsr@ietf.org>, "lsr-chairs@ietf.org" <lsr-chairs@ietf.org>, Linda = Dunbar <linda.dunbar@futurewei.com= >
Subject: Re: [Lsr] Question on using OSFPv2 extended = Prefix TLV as the OSPF extension for 5G Edge Computing (was RE: IETF 109 = LSR Presentation Slot Requests

 

For OSPFv3 use E-LSAs = (RFC8362)

 

Cheers,

Jeff

On Nov 4, 2020, 2:44 PM -0800, Linda Dunbar <linda.dunbar@futurewei.com= >, wrote:

Acee,

 

Thank you very much for = suggesting using the Prefix TLV for carry the Running Status and = environment of 5G Edge Computing servers.

 

In a nutshell, = the https://datatracker.ietf.org/doc/draft-dunbar-lsr-5g-edge-compute-o= spf-ext/ proposes the extension to LSA = that can carry the three SubTLVs that are used to represent the Running = Status and Environment information of the 5G Edge Computing Servers = attached to the router:

 

 =E2=80=A2 Load measurement = sub-TLV 

 =E2=80=A2 Capacity = Index  Sub-TLV             =                

 =E2=80=A2 Preference = Index  Sub-TLV              =                     =                 =  

 

Several sections of the = draft are devoted to describe what those measurement are and why need = them for 5G Edge Computing, which may have made it not so = straightforward when reading in a rush.

 

The Goal of the OSPF = extension is to carry those Sub-TLVs in the router=E2=80=99s LSA to be = advertised to other routers in the 5G Local Data Network.

 

If using your suggested = RFC7684 OSPFv2 Extended Prefix TLV, the extension does seem easier and = cleaner:

 

We can = have:

 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 = 0 1

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

| = Type                   =        | Length         =                |

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

| = Route Type    | Prefix Length | AF     =        | Flags        =  |

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

| = Address Prefix (variable)            =                     =      |

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+&n= bsp; 

| Load = Measurement Sub-TLV             =                     =      |

~                  =                     =                     =      ~

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+&n= bsp; 

| = capacity Index Sub-TLV             =                     =        |

~                  =                     =                     =      ~

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+&n= bsp; 

| Site = Preference Sub-TLV              =                     =      |

~                  =                     =                     =      ~  

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+&n= bsp; 

 

 

RFC7684 only has the = Extended Prefix TLV for IPv4. If the App Server addresses are in IPv6, = should we specify the extension to RFC8362 in the same draft? Or define = a new AF type for the same extension to RFC7684?

 

Your guidance is = greatly appreciated.

 

Thank you very = much.

 

Linda = Dunbar

 

 

From: Acee Lindem (acee) <acee@cisco.com>

Sent: Tuesday, November 3, 2020 1:38 = PM

To: Linda Dunbar <linda.dunbar@futurewei.com= >; Yingzhen Qu <yingzhen.ietf@gmail.com>; = lsr@ietf.org; lsr-chairs@ietf.org

Subject: Re: Need 10 minute slot to discuss OSPF extension for = 5G Edge Computing (was RE: [Lsr] IETF 109 LSR Presentation Slot = Requests

 

We have a pretty full schedule and we add you as optional. = I took a look at the draft and it is all over the place right now with = standardization requested for one solution but 3 separate solutions = partially specified. It could benefit from some WG mailing list = discussion prior to a 10 minute presentation where we wouldn=E2=80=99t = have time to discuss the many = issues.

 

One major issue is that you should be extending RFC 7684 = rather than RFC 3630 and it seems you these app-server selection metrics = should be associated with a prefix and NOT a stub link (i.e., the = application server = address).

 

I=E2=80=99ll try to read it in more depth before IETF = 109.

 

Thanks,

Acee

 

F= rom: Linda Dunbar <linda.dunbar@futurewei.com>

D= ate: Monday, November 2, 2020 at = 10:12 PM

T= o: Yingzhen Qu = <yingzhen.ietf@gmail.com>, = "lsr@ietf.org" = <lsr@ietf.org>, = "lsr-chairs@ietf.org" = <lsr-chairs@ietf.org>

S= ubject: Need 10 minute slot to = discuss OSPF extension for 5G Edge Computing (was RE: [Lsr] IETF 109 LSR = Presentation Slot Requests

R= esent-From: <alias-bounces@ietf.org>

R= esent-To: Yingzhen Qu = <yingzhen.ietf@gmail.com>, Acee Lindem = <acee@cisco.com>, Christian = Hopps <chopps@chopps.org>

R= esent-Date: Monday, November 2, 2020 at = 10:12 PM

 

LSR Chairs, = YingZhen,

 

Can you give us 10 minute slot to present this new = draft:

https://datatracker.ietf.org/doc/draft-dunbar-lsr-5g-ed= ge-compute-ospf-ext/

 

This draft describes an OSPF extension that can distribute = the 5G Edge Computing App running status and environment, so that other = routers in the 5G Local Data Network can make intelligent decision on = optimizing forwarding of flows from UEs. The goal is to improve latency = and performance for 5G Edge Computing = services.

 

Thank you very = much,

 

Linda Dunbar

 

From: Lsr <lsr-bounces@ietf.org> On Behalf = Of Yingzhen = Qu

Sent: Monday, October 19, 2020 3:52 = PM

To: lsr@ietf.org; lsr-chairs@ietf.org

Subject: [Lsr] IETF 109 LSR Presentation Slot = Requests

 

Hi all, 

 

We're now accepting agenda requests for the = LSR Working Grouping meeting IETF 109. Please send your requests = to lsr-chairs@ietf.org indicating draft name, speaker, and = desired duration (covering presentation and = discussion). 

 

LSR session is scheduled on Monday, Nov 16, = 12:00-14:00 ICT.

 

Thanks,

Yingzhen

_______________________________________________

Lsr mailing = list

Lsr@ietf.org

https://www.ietf.org/mailman/listinfo/lsr

------=_NextPart_000_0220_01D6B67A.7DCB2920-- From nobody Sun Nov 8 22:35:27 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B108D3A0100 for ; Sun, 8 Nov 2020 22:35:25 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.897 X-Spam-Level: X-Spam-Status: No, score=-1.897 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id HdADlyLIT6Se for ; Sun, 8 Nov 2020 22:35:23 -0800 (PST) Received: from mail-m127101.qiye.163.com (mail-m127101.qiye.163.com [115.236.127.101]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id E28243A00E3 for ; Sun, 8 Nov 2020 22:35:22 -0800 (PST) Received: from DESKTOP2IOH5QC (unknown [219.142.69.75]) by mail-m127101.qiye.163.com (Hmail) with ESMTPA id 8D61345952; Mon, 9 Nov 2020 14:35:18 +0800 (CST) From: "Aijun Wang" To: "'Peter Psenak'" , "'Aijun Wang'" Cc: "'Acee Lindem \(acee\)'" , References: <204560AE-A58C-49C3-A882-2AE8FF145D0A@chinatelecom.cn> <319f9938-f2b5-2f50-c4d0-7813c226847d@cisco.com> In-Reply-To: <319f9938-f2b5-2f50-c4d0-7813c226847d@cisco.com> Date: Mon, 9 Nov 2020 14:35:18 +0800 Message-ID: <024901d6b662$7dcb8b30$7962a190$@tsinghua.org.cn> MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Mailer: Microsoft Outlook 16.0 Thread-Index: AQDQwFlQgUiTuyFIObMb+aYQMqsdBQFfpo/KAspG9AmrqZ7KgA== Content-Language: zh-cn X-HM-Spam-Status: e1kfGhgUHx5ZQUtXWQgYFAkeWUFZS1VLWVdZKFlBSkxLS0o3V1ktWUFJV1 kPCRoVCBIfWUFZSkseSU8ZH0MaS05NVkpNS09CS0hMSkNDQktVEwETFhoSFyQUDg9ZV1kWGg8SFR 0UWUFZT0tIVUpKS0hPQ1VLWQY+ X-HM-Sender-Digest: e1kMHhlZQR0aFwgeV1kSHx4VD1lBWUc6ORw6Cio*Vj8eARIeAhABGRZL UShPCUhVSlVKTUtPQktITEpCSExCVTMWGhIXVQwaFRwaEhEOFTsPCBIVHBMOGlUUCRxVGBVFWVdZ EgtZQVlJSkJVSk9JVU1CVUxOWVdZCAFZQUNLT0s3Bg++ X-HM-Tid: 0a75abb74f459865kuuu8d61345952 Archived-At: Subject: Re: [Lsr] FW: New Version Notification for draft-wang-lsr-passive-interface-attribute-04.txt X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 09 Nov 2020 06:35:26 -0000 Hi, Peter: Currently, the inter-AS link TLV is advertised within the = Inter-AS-TE-LSA for OSPF and Inter-AS Reachability TLV for ISIS. But I think these two places are not suitable for the stub-link = information. It seems that separating the stub-link information from the inter-as = link information is better, because not all of the stub-links are = inter-as link.=20 If so, can we put the newly defined Stub-Link TLV within the Router LSA = for OSPF and make it one new top TLV for ISIS? Best Regards Aijun Wang China Telecom -----Original Message----- From: Peter Psenak [mailto:ppsenak@cisco.com]=20 Sent: Saturday, November 7, 2020 1:56 AM To: Aijun Wang Cc: Aijun Wang ; Acee Lindem (acee) = ; lsr@ietf.org Subject: Re: [Lsr] FW: New Version Notification for = draft-wang-lsr-passive-interface-attribute-04.txt Aijun, On 05/11/2020 12:04, Aijun Wang wrote: > Hi, Peter: > Then how about defines one new top TLV to flood such information = within the IGP? Fox example, Stub-Link TLV? If so, other characteristics = associated with the Link can also be advertised accordingly. yes, unless you can use or extend the existing inter-AS link = advertisement. thanks, Peter >=20 > If acceptable, we can forward this draft along this direction. >=20 >=20 > Aijun Wang > China Telecom >=20 >> On Nov 5, 2020, at 17:15, Peter Psenak = wrote: >> >> Aijun, >> >> the point I was trying to make was that you should think of a similar = mechanism for your use cases - e.g. define something that advertises the = link without advertising the IS adjacency and not mess up with the = prefix advertisement. >> >> thanks, >> Peter >> >>> On 05/11/2020 10:09, Aijun Wang wrote: >>> Hi, Peter: >>> Yes, RFC 5392 is the OSPF corresponding part for the inter-AS TE = solution. But using these existing solutions has some limitation in = deployment, as I explained in = https://mailarchive.ietf.org/arch/msg/lsr/VLufuaGDiRgaflcu58FY_SHnJ7A/. >>> And, in some situations, not all of the passive interfaces are = connected with another AS, then flag these interfaces using RFC 5316 or = RFC 5392 is not appropriate. >>> Do you agree? >>> Best Regards >>> Aijun Wang >>> China Telecom >>> -----Original Message----- >>> From: ppsenak@cisco.com [mailto:ppsenak@cisco.com] >>> Sent: Thursday, November 5, 2020 4:26 PM >>> To: Aijun Wang ; 'Acee Lindem (acee)'=20 >>> ; 'Aijun Wang' >>> Cc: lsr@ietf.org >>> Subject: Re: [Lsr] FW: New Version Notification for=20 >>> draft-wang-lsr-passive-interface-attribute-04.txt >>> Hi Aijun, >>> please look at rfc5316, ISIS already have a way to advertise = inter-AS link without forming an adjacency. >>> thanks, >>> Peter >>>> On 05/11/2020 02:15, Aijun Wang wrote: >>>> Hi, Acee: >>>> >>>> Thanks for this comments. >>>> The consideration for the position of flagging the passive = interface have been stated in the updated 05 version = https://tools.ietf.org/html/draft-wang-lsr-passive-interface-attribute-05= #section-3, as the followings: >>>> >>>> ISIS [RFC5029] defines the Link-Attributes Sub-TLV to carry = the link >>>> attribute information, but this Sub-TLV can only be carried = within >>>> the TLV 22, which is used to described the attached neighbor. = For >>>> passive interface, there is no ISIS neighbor, then it is not >>>> appropriate to use this Sub-TLV to indicate the passive = attribute of >>>> the interface. >>>> >>>> OSPFv2[RFC2328] defines link type field within Router LSA, the = type 3 >>>> for connections to a stub network can be used to identified = the >>>> passive interface. But in OSPFv3 [RFC5340], type 3 within the >>>> Router-LSA has been reserved. The information that associated = with >>>> stub network has been put in the Intra-Area-Prefix-LSAs. >>>> >>>> What about your opinions regarding to the above statements? = Currently, we think putting the flag within the prefix attribute that = associated the passive interface is appropriate. >>>> If we can find other appropriate/acceptable place to hold this = information, we can also update the draft later accordingly. >>>> >>>> >>>> Best Regards >>>> >>>> Aijun Wang >>>> China Telecom >>>> >>>> >>>> -----Original Message----- >>>> From: Acee Lindem (acee) [mailto:acee@cisco.com] >>>> Sent: Thursday, November 5, 2020 4:11 AM >>>> To: Aijun Wang >>>> Cc: Aijun Wang ; Peter Psenak (ppsenak)=20 >>>> ; lsr@ietf.org >>>> Subject: Re: [Lsr] FW: New Version Notification for=20 >>>> draft-wang-lsr-passive-interface-attribute-04.txt >>>> >>>> Hi Aijun, >>>> You still didn't answer the question as to why you didn't rework = this draft for passive interface to be an interface attribute rather = than a prefix attribute? >>>> Thanks, >>>> Acee >>>> >>>>> On 10/1/20, 6:13 AM, "Acee Lindem (acee)" wrote: >>>> >>>> Hi Aijun, >>>> You didn't answer my question and pruned my message. Other = than your attempt to expose the topology of areas outside the area, = there is no other reason to associate the passive interface attribute = with a prefix. We seem to be in a circular discussion.... >>>> Acee >>>> >>>>> On 9/30/20, 10:43 PM, "wangaj3@chinatelecom.cn on behalf of = Aijun Wang" wrote: >>>> >>>> Hi, Acee: >>>> Except the corner cases of unnumbered interface, would = you like to illustrate other scenarios that the process does not apply? >>>> As mentioned in last mail, knowing the passive interfaces = can assist the nodes or controller know the boundaries of the network. >>>> >>>> Aijun Wang >>>> China Telecom >>>> >>>> > On Sep 30, 2020, at 19:47, Acee Lindem (acee) = wrote: >>>> > >>>> >>>> >>>> >>>> >>>> _______________________________________________ >>>> Lsr mailing list >>>> Lsr@ietf.org >>>> https://www.ietf.org/mailman/listinfo/lsr >>>> >>>> >>> _______________________________________________ >>> Lsr mailing list >>> Lsr@ietf.org >>> https://www.ietf.org/mailman/listinfo/lsr >> >=20 >=20 >=20 From nobody Mon Nov 9 01:44:02 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D37333A0DC8 for ; Mon, 9 Nov 2020 01:43:59 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -10.302 X-Spam-Level: X-Spam-Status: No, score=-10.302 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, NICE_REPLY_A=-0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id l2otub8gHX1g for ; Mon, 9 Nov 2020 01:43:57 -0800 (PST) Received: from aer-iport-1.cisco.com (aer-iport-1.cisco.com [173.38.203.51]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 0D8723A0DCD for ; Mon, 9 Nov 2020 01:43:56 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=6882; q=dns/txt; s=iport; t=1604915037; x=1606124637; h=subject:to:cc:references:from:message-id:date: mime-version:in-reply-to:content-transfer-encoding; bh=hAmCLv5Ds3Ko1kTc+hmP25cVXUSOwB8F2jKKN9sPYAw=; b=QAwX8qsSYOpksowC+7UkwX7g/VxRj2BH8aYV9KOb/ecoNf8QcYD2qKfA HiUww81KgcvIYD3S3Ei8Hzz2tfHDd4wrTHn2TA6/gAWHao716jWwD0pkw o8Ltop4gdMFvbb1ty0ogXxzRVEPPyhrTUbelu14L04sXv0KVRxM8KyV2a 4=; X-IronPort-AV: E=Sophos;i="5.77,463,1596499200"; d="scan'208";a="30971553" Received: from aer-iport-nat.cisco.com (HELO aer-core-3.cisco.com) ([173.38.203.22]) by aer-iport-1.cisco.com with ESMTP/TLS/DHE-RSA-SEED-SHA; 09 Nov 2020 09:43:55 +0000 Received: from [10.60.140.51] (ams-ppsenak-nitro2.cisco.com [10.60.140.51]) by aer-core-3.cisco.com (8.15.2/8.15.2) with ESMTP id 0A99hsZh022243; Mon, 9 Nov 2020 09:43:54 GMT To: Aijun Wang , "'Aijun Wang'" Cc: "'Acee Lindem (acee)'" , lsr@ietf.org References: <204560AE-A58C-49C3-A882-2AE8FF145D0A@chinatelecom.cn> <319f9938-f2b5-2f50-c4d0-7813c226847d@cisco.com> <024901d6b662$7dcb8b30$7962a190$@tsinghua.org.cn> From: Peter Psenak Message-ID: <165da98a-4e99-3434-fe60-74a1f356b50e@cisco.com> Date: Mon, 9 Nov 2020 10:43:54 +0100 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: <024901d6b662$7dcb8b30$7962a190$@tsinghua.org.cn> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Outbound-SMTP-Client: 10.60.140.51, ams-ppsenak-nitro2.cisco.com X-Outbound-Node: aer-core-3.cisco.com Archived-At: Subject: Re: [Lsr] FW: New Version Notification for draft-wang-lsr-passive-interface-attribute-04.txt X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 09 Nov 2020 09:44:00 -0000 Hi Aijun, On 09/11/2020 07:35, Aijun Wang wrote: > Hi, Peter: > > Currently, the inter-AS link TLV is advertised within the Inter-AS-TE-LSA for OSPF and Inter-AS Reachability TLV for ISIS. > But I think these two places are not suitable for the stub-link information. > > It seems that separating the stub-link information from the inter-as link information is better, because not all of the stub-links are inter-as link. > If so, can we put the newly defined Stub-Link TLV within the Router LSA for OSPF and make it one new top TLV for ISIS? Router LSA does not have TLVs, you would have to add the data to Extended Prefix Link TLV (RFC7684), or define a net top-level TLV under the OSPFv2 Extended Link Opaque LSA. For ISIS you don't have a choice really, you need to define a new top-level TLV. thanks, Peter > > > Best Regards > > Aijun Wang > China Telecom > > -----Original Message----- > From: Peter Psenak [mailto:ppsenak@cisco.com] > Sent: Saturday, November 7, 2020 1:56 AM > To: Aijun Wang > Cc: Aijun Wang ; Acee Lindem (acee) ; lsr@ietf.org > Subject: Re: [Lsr] FW: New Version Notification for draft-wang-lsr-passive-interface-attribute-04.txt > > Aijun, > > On 05/11/2020 12:04, Aijun Wang wrote: >> Hi, Peter: >> Then how about defines one new top TLV to flood such information within the IGP? Fox example, Stub-Link TLV? If so, other characteristics associated with the Link can also be advertised accordingly. > > yes, unless you can use or extend the existing inter-AS link advertisement. > > thanks, > Peter > >> >> If acceptable, we can forward this draft along this direction. >> >> >> Aijun Wang >> China Telecom >> >>> On Nov 5, 2020, at 17:15, Peter Psenak wrote: >>> >>> Aijun, >>> >>> the point I was trying to make was that you should think of a similar mechanism for your use cases - e.g. define something that advertises the link without advertising the IS adjacency and not mess up with the prefix advertisement. >>> >>> thanks, >>> Peter >>> >>>> On 05/11/2020 10:09, Aijun Wang wrote: >>>> Hi, Peter: >>>> Yes, RFC 5392 is the OSPF corresponding part for the inter-AS TE solution. But using these existing solutions has some limitation in deployment, as I explained in https://mailarchive.ietf.org/arch/msg/lsr/VLufuaGDiRgaflcu58FY_SHnJ7A/. >>>> And, in some situations, not all of the passive interfaces are connected with another AS, then flag these interfaces using RFC 5316 or RFC 5392 is not appropriate. >>>> Do you agree? >>>> Best Regards >>>> Aijun Wang >>>> China Telecom >>>> -----Original Message----- >>>> From: ppsenak@cisco.com [mailto:ppsenak@cisco.com] >>>> Sent: Thursday, November 5, 2020 4:26 PM >>>> To: Aijun Wang ; 'Acee Lindem (acee)' >>>> ; 'Aijun Wang' >>>> Cc: lsr@ietf.org >>>> Subject: Re: [Lsr] FW: New Version Notification for >>>> draft-wang-lsr-passive-interface-attribute-04.txt >>>> Hi Aijun, >>>> please look at rfc5316, ISIS already have a way to advertise inter-AS link without forming an adjacency. >>>> thanks, >>>> Peter >>>>> On 05/11/2020 02:15, Aijun Wang wrote: >>>>> Hi, Acee: >>>>> >>>>> Thanks for this comments. >>>>> The consideration for the position of flagging the passive interface have been stated in the updated 05 version https://tools.ietf.org/html/draft-wang-lsr-passive-interface-attribute-05#section-3, as the followings: >>>>> >>>>> ISIS [RFC5029] defines the Link-Attributes Sub-TLV to carry the link >>>>> attribute information, but this Sub-TLV can only be carried within >>>>> the TLV 22, which is used to described the attached neighbor. For >>>>> passive interface, there is no ISIS neighbor, then it is not >>>>> appropriate to use this Sub-TLV to indicate the passive attribute of >>>>> the interface. >>>>> >>>>> OSPFv2[RFC2328] defines link type field within Router LSA, the type 3 >>>>> for connections to a stub network can be used to identified the >>>>> passive interface. But in OSPFv3 [RFC5340], type 3 within the >>>>> Router-LSA has been reserved. The information that associated with >>>>> stub network has been put in the Intra-Area-Prefix-LSAs. >>>>> >>>>> What about your opinions regarding to the above statements? Currently, we think putting the flag within the prefix attribute that associated the passive interface is appropriate. >>>>> If we can find other appropriate/acceptable place to hold this information, we can also update the draft later accordingly. >>>>> >>>>> >>>>> Best Regards >>>>> >>>>> Aijun Wang >>>>> China Telecom >>>>> >>>>> >>>>> -----Original Message----- >>>>> From: Acee Lindem (acee) [mailto:acee@cisco.com] >>>>> Sent: Thursday, November 5, 2020 4:11 AM >>>>> To: Aijun Wang >>>>> Cc: Aijun Wang ; Peter Psenak (ppsenak) >>>>> ; lsr@ietf.org >>>>> Subject: Re: [Lsr] FW: New Version Notification for >>>>> draft-wang-lsr-passive-interface-attribute-04.txt >>>>> >>>>> Hi Aijun, >>>>> You still didn't answer the question as to why you didn't rework this draft for passive interface to be an interface attribute rather than a prefix attribute? >>>>> Thanks, >>>>> Acee >>>>> >>>>>> On 10/1/20, 6:13 AM, "Acee Lindem (acee)" wrote: >>>>> >>>>> Hi Aijun, >>>>> You didn't answer my question and pruned my message. Other than your attempt to expose the topology of areas outside the area, there is no other reason to associate the passive interface attribute with a prefix. We seem to be in a circular discussion.... >>>>> Acee >>>>> >>>>>> On 9/30/20, 10:43 PM, "wangaj3@chinatelecom.cn on behalf of Aijun Wang" wrote: >>>>> >>>>> Hi, Acee: >>>>> Except the corner cases of unnumbered interface, would you like to illustrate other scenarios that the process does not apply? >>>>> As mentioned in last mail, knowing the passive interfaces can assist the nodes or controller know the boundaries of the network. >>>>> >>>>> Aijun Wang >>>>> China Telecom >>>>> >>>>> > On Sep 30, 2020, at 19:47, Acee Lindem (acee) wrote: >>>>> > >>>>> >>>>> >>>>> >>>>> >>>>> _______________________________________________ >>>>> Lsr mailing list >>>>> Lsr@ietf.org >>>>> https://www.ietf.org/mailman/listinfo/lsr >>>>> >>>>> >>>> _______________________________________________ >>>> Lsr mailing list >>>> Lsr@ietf.org >>>> https://www.ietf.org/mailman/listinfo/lsr >>> >> >> >> > > > > From nobody Tue Nov 10 09:59:01 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: 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wangaj3@chinatelecom.cn X-Receive-IP: 172.18.0.48 X-MEDUSA-Status: 0 Sender: wangaj3@chinatelecom.cn Content-Type: multipart/alternative; boundary=Apple-Mail-CC4C810F-5B46-4D38-A2D4-8663C772409C Content-Transfer-Encoding: 7bit From: Aijun Wang Mime-Version: 1.0 (1.0) Date: Wed, 11 Nov 2020 07:27:35 +0800 Message-Id: <9EFE4913-32A5-4E99-9DC4-FF87DDF8D29B@chinatelecom.cn> References: <38721A88-38D8-4631-8C4F-6779F630C06E@cisco.com> Cc: "Peter Psenak (ppsenak)" , Aijun Wang , lsr@ietf.org In-Reply-To: <38721A88-38D8-4631-8C4F-6779F630C06E@cisco.com> To: "Acee Lindem (acee)" X-Mailer: iPhone Mail (18A373) Archived-At: Subject: Re: [Lsr] FW: New Version Notification for draft-wang-lsr-passive-interface-attribute-04.txt X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 10 Nov 2020 23:27:50 -0000 --Apple-Mail-CC4C810F-5B46-4D38-A2D4-8663C772409C Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Hi, Acee: I have updated the draft according to the discussion with Peter on the list.= The updated draft will be uploaded once the IETF repository reopen. We define new TLV to contain the stub-link related information within OSPFv2= /v3 and ISIS respectively. The presentation will also align with it. Together with the use case that described in Linda=E2=80=99s draft https://t= ools.ietf.org/html/draft-dunbar-lsr-5g-edge-compute-ospf-ext-01, we think th= is extension is necessary and should be considered within IGP. Thanks in advance. Aijun Wang China Telecom > On Nov 11, 2020, at 02:01, Acee Lindem (acee) wrote: >=20 > =EF=BB=BFAijun,=20 >=20 > Speaking as WG member: >=20 > At least for OSPF, passive interfaces are not standardized in RFC 2328 or R= FC 5340. Hence, this purely a vendor concept.=20 > Additionally, it is a property, albeit a vendor property, of a link and no= t a prefix. It would be both inappropriate and profligate (considering the s= carcity) to allocate a prefix option for the purpose of identifying a passiv= e link associated with the prefix. Given your narrow use case of identifying= the edge of an IGP domain, it would certainly be better to allocate a new T= LV specifically for purpose and perhaps this doesn't belong in the IGPs at a= ll and should be something you propose solely for BGP-LS consumption.=20 >=20 > Speaking as WG Co-chair: >=20 > Given strong objections to this draft in its current form, I don't really s= ee a good reason for present it at IETF 109. I believe it would just be a re= hash of the discuss that has already taken place. >=20 > Thanks, > Acee >=20 > =EF=BB=BFOn 11/9/20, 4:44 AM, "Peter Psenak" wrote: >=20 > Hi Aijun, >=20 >> On 09/11/2020 07:35, Aijun Wang wrote: >> Hi, Peter: >>=20 >> Currently, the inter-AS link TLV is advertised within the Inter-AS-TE-LSA= for OSPF and Inter-AS Reachability TLV for ISIS. >> But I think these two places are not suitable for the stub-link informati= on. >>=20 >> It seems that separating the stub-link information from the inter-as link= information is better, because not all of the stub-links are inter-as link.= >> If so, can we put the newly defined Stub-Link TLV within the Router LSA f= or OSPF and make it one new top TLV for ISIS? >=20 > Router LSA does not have TLVs, you would have to add the data to=20 > Extended Prefix Link TLV (RFC7684), or define a net top-level TLV under= =20 > the OSPFv2 Extended Link Opaque LSA. >=20 > For ISIS you don't have a choice really, you need to define a new=20 > top-level TLV. >=20 > thanks, > Peter >=20 >>=20 >>=20 >> Best Regards >>=20 >> Aijun Wang >> China Telecom >>=20 >> -----Original Message----- >> From: Peter Psenak [mailto:ppsenak@cisco.com] >> Sent: Saturday, November 7, 2020 1:56 AM >> To: Aijun Wang >> Cc: Aijun Wang ; Acee Lindem (acee) ; lsr@i --Apple-Mail-CC4C810F-5B46-4D38-A2D4-8663C772409C Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable Hi, Acee:
I have updated the draft acco= rding to the discussion with Peter on the list. The updated draft will be up= loaded once the IETF repository reopen.
We define new TLV to conta= in the stub-link related information within OSPFv2/v3 and ISIS respectively.= The presentation will also align with it.

Together= with the use case that described in Linda=E2=80=99s draft htt= ps://tools.ietf.org/html/draft-dunbar-lsr-5g-edge-compute-ospf-ext-01, w= e think this extension is necessary and should be considered within IGP.
Thanks in advance.

Aijun Wang
China Telec= om

On Nov 11, 2020= , at 02:01, Acee Lindem (acee) <acee@cisco.com> wrote:

=EF=BB=BFAijun, <= /span>

Speaking as WG member:

At least for OSPF, passive interfaces are not standardized in R= FC 2328 or RFC 5340. Hence, this purely a vendor concept.
A= dditionally, it is a property, albeit a vendor property, of a link and not a= prefix. It would be both inappropriate and profligate (considering the scar= city) to allocate a prefix option for the purpose of identifying a passive l= ink associated with the prefix. Given your narrow use case of identifying th= e edge of an IGP domain, it would certainly be better to allocate a new TLV s= pecifically for purpose and perhaps this doesn't belong in the IGPs at all a= nd should be something you propose solely for BGP-LS consumption.
Speaking as WG Co-chair:

= Given strong objections to this draft in its current form, I don't rea= lly see a good reason for present it at IETF 109. I believe it would just be= a rehash of the discuss that has already taken place.

Thanks,
Acee

=EF= =BB=BFOn 11/9/20, 4:44 AM, "Peter Psenak" <ppsenak@cisco.com> wrote:

   Hi Aijun,

   On 09/11/2020 07:35, Aijun Wang wrote:<= /span>
Hi, Peter:
=

Currently, the inter-AS link TLV is advertised within the Inter-= AS-TE-LSA for OSPF and Inter-AS Reachability TLV for ISIS.
But I think these two places are not s= uitable for the stub-link information.

It= seems that separating the stub-link information from the inter-as link info= rmation is better, because not all of the stub-links are inter-as link.
If so, can we put the new= ly defined Stub-Link TLV within the Router LSA for OSPF and make it one new t= op TLV for ISIS?

  =  Router LSA does not have TLVs, you would have to add the data to
   Extended Prefix Link TLV (RFC7684), or define= a net top-level TLV under
   the OSPFv2 Ex= tended Link Opaque LSA.

   = For ISIS you don't have a choice really, you need to define a new    top-level TLV.

&= nbsp;  thanks,
   Peter
=


Best Regards

Aijun Wang
China Telecom

-----Original Message-----
From: Peter Psenak [mailto:ppsenak@cisco.com]
Sent: Saturday, November 7= , 2020 1:56 AM
To: Ai= jun Wang <wangaj3@chinatelecom.cn>
Cc: Aijun Wang <wangaijun@tsinghua.org.cn>; Acee Li= ndem (acee) <acee@cisco.com>; lsr@i
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ipr-announce@ietf.org, lsr@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 7.22.0 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <160527975919.6700.11621392089191201980@ietfa.amsl.com> Date: Fri, 13 Nov 2020 07:02:39 -0800 Archived-At: Subject: [Lsr] IPR Disclosure Huawei Technologies Co., Ltd's Statement about IPR related to draft-ietf-lsr-isis-srv6-extensions and draft-ietf-idr-bgpls-srv6-ext X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 13 Nov 2020 15:02:39 -0000 Dear Peter Psenak, Clarence Filsfils, Ahmed Bashandy, Bruno Decraene, Zhibo Hu: An IPR disclosure that pertains to your Internet-Draft entitled "IS-IS Extension to Support Segment Routing over IPv6 Dataplane" (draft-ietf-lsr-isis-srv6-extensions) was submitted to the IETF Secretariat on 2020-11-13 and has been posted on the "IETF Page of Intellectual Property Rights Disclosures" (https://datatracker.ietf.org/ipr/4486/). The title of the IPR disclosure is "Huawei Technologies Co.,Ltd's Statement about IPR related to draft-ietf-lsr-isis-srv6-extensions and draft-ietf-idr-bgpls-srv6-ext" Thank you IETF Secretariat From nobody Fri Nov 13 15:58:01 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0F1143A0FFA; Fri, 13 Nov 2020 15:57:55 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -9.597 X-Spam-Level: X-Spam-Status: No, score=-9.597 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, HTML_MESSAGE=0.001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com header.b=fO7/O525; dkim=pass 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[73.63.232.212]) by smtp.gmail.com with ESMTPSA id w13sm11095802pfd.49.2020.11.13.17.52.11 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 13 Nov 2020 17:52:11 -0800 (PST) Content-Type: multipart/alternative; boundary=Apple-Mail-B680E85A-C852-4710-A6C5-D63AEC1D35A6 Content-Transfer-Encoding: 7bit From: Jeff Tantsura Mime-Version: 1.0 (1.0) Date: Fri, 13 Nov 2020 17:52:10 -0800 Message-Id: References: Cc: "Ketan Talaulikar (ketant)" , Susan Hares , "Stephane Litkowski (slitkows)" , idr@ietf.org, "Acee Lindem (acee)" , lsr@ietf.org In-Reply-To: To: "Les Ginsberg (ginsberg)" X-Mailer: iPhone Mail (18B92) Archived-At: Subject: Re: [Lsr] [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu (11/1/2020 to 11/16/2020) X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 14 Nov 2020 01:52:17 -0000 --Apple-Mail-B680E85A-C852-4710-A6C5-D63AEC1D35A6 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable To add to Les=E2=80=99s point of BGP only scenario, during MSD IESG reviews,= BGP-LS only deployment was found not well characterized and had been remove= d from the draft. It will require much better discussion to have it included= . Regards, Jeff > On Nov 13, 2020, at 15:57, Les Ginsberg (ginsberg) wr= ote: >=20 > =EF=BB=BF > The points which Ketan has made regarding the use of MTU advertisements de= fined in RFC 7176 are very valid. Indeed, the contents of the sub-TLV define= d in https://www.rfc-editor.org/rfc/rfc7176.html#section-2.4 depend upon the= TRILL specific MTU-probe/MTU-ack procedures defined in https://www.rfc-edit= or.org/rfc/rfc6325#section-4.4.3. These procedures are not currently applica= ble to non-TRILL environments. > =20 > So, there are no existing IGP advertisements defined which can support the= goals of this draft. > =20 > As Ketan has also indicated, there is no discussion in the draft of how a B= GP only network (for example) could provide the information of interest. > =20 > =46rom my perspective, WG adoption of this draft in ANY WG is premature. > This might be a useful functionality to have =E2=80=93 but at the moment w= e simply have an idea with no definition of how to implement/deploy it. > =20 > So I therefore oppose WG adoption of this draft by IDR. > =20 > Continuing the discussion is certainly useful =E2=80=93 and I would encour= age the current authors to investigate and propose relevant mechanisms in al= l the protocols of interest in some future version of the draft. > At that point we could then have a far more meaningful WG adoption call. > =20 > Les > =20 > =20 > From: Idr On Behalf Of Ketan Talaulikar (ketant) > Sent: Friday, November 13, 2020 1:35 AM > To: Susan Hares ; 'Jeff Tantsura' ; 'Stephane Litkowski (slitkows)' ;= idr@ietf.org; 'Acee Lindem (acee)' > Cc: lsr@ietf.org > Subject: Re: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu (11/1/202= 0 to 11/16/2020) > =20 > Hi Authors, > =20 > I believe this work is useful and should be taken up. It has value in prov= iding the link MTU as part of the topology information via BGP-LS. However, a= s pointed out by others on this thread, the draft should remain scoped to ju= st that =E2=80=93 i.e. providing link MTU information. The discussion relate= d to Path MTU and applicability to SR networks are best left outside the sco= pe of this standards track draft. > =20 > Hi Sue, > =20 > I would support the points made by Acee for not taking up this draft in ID= R WG and instead doing this in LSR. > =20 > Besides the missing coverage for OSPFv2/v3, there are also issues with how= this would work with ISIS. The reference to the ISIS Trill specification po= ints to this TLV https://tools.ietf.org/html/rfc7176#section-2.4 =E2=80=93 i= f you see, there is more here than just the MTU value. What is more critical= is the ISIS procedures (in non-Trill deployments) on how this value is dete= rmined. Please do not mix the following : > =20 > The MTU sub-TLV is used to optionally announce the MTU of a link as > specified in [RFC6325], Section 4.2.4.4. > =20 > Are the authors trying to specify that these Trill procedures for testing M= TU need to be adopted for regular ISIS deployments. > =20 > My take is that while the ISIS TLV defined for Trill may be re-used in nor= mal ISIS deployments, its usage and procedures need to be specified. Copying= the LSR WG so that I may be corrected if I am wrong here. > =20 > Coming to the point of BGP-only networks, the draft has zero text related t= o that scenario. Moreover, the procedures for BGP-LS advertisements in BGP o= nly fabric need to be specified as a base. The https://datatracker.ietf.org/= doc/draft-ketant-idr-bgp-ls-bgp-only-fabric/ was my attempt to specify those= procedures and it would be great if the IDR WG could review and provide fee= dback to this document and consider for adoption so we can cover the BGP-onl= y networks. > =20 > I would also like to offer support/help to the authors in adding the neces= sary OSPFv2/v3 support for the same in an LSR draft where we could tackle bo= th the IGPs and BGP-LS encoding and procedures together. > =20 > Thanks, > Ketan > =20 > From: Idr On Behalf Of Susan Hares > Sent: 13 November 2020 00:20 > To: 'Jeff Tantsura' ; 'Stephane Litkowski (slitko= ws)' ; idr@ietf.org; 'Acee Lindem (ac= ee)' > Subject: Re: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu (11/1/202= 0 to 11/16/2020) > =20 > Jeff and Authors of draft-zhu-idr-bgp-ls-path-mtu: > =20 > I do believe the authors agreed to renaming the draft. =20 > =20 > Does the name: draft-xxx-idr-bgp-ls-link-mtu work for > the authors and interested IDR participants. > =20 > As the end of 12 days of the 14 day WG LC, this draft appears > to have general consensus from the WG as a useful draft. > =20 > I plan to allow 2 more days of comment, but at this point > it appears the WG wishes to adopt this draft.=20 > =20 > Here=E2=80=99s my understanding of the best way forward: > =20 > If LSR adopts a version of the draft, IDR will allow the > LSR WG to be the main source as long as cross-working > review occurs so the BGP-only function can be reviewed. > =20 > Please continue to comment on the draft and > the planned progression. > =20 > Cheers, Sue > =20 > From: Jeff Tantsura [mailto:jefftant.ietf@gmail.com]=20 > Sent: Thursday, November 12, 2020 12:53 PM > To: Susan Hares; Stephane Litkowski (slitkows); idr@ietf.org; Acee Lindem (= acee) > Subject: Re: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu (11/1/202= 0 to 11/16/2020) > =20 > +1 to everything Acee said > =20 > Cheers, > Jeff > On Nov 10, 2020, 1:01 PM -0800, Acee Lindem (acee) , wrote: >=20 > Speaking as an IDR WG member: > =20 > The name of the draft is wrong =E2=80=93 the extension is for a Link MTU a= nd not a path MTU. > =20 > Speaking as LSR Chair: > =20 > We could this in LSR as there is currently no MTU advertisement in the LSA= s for OSPFv2 and OSPFv3. Implementations already make use of this informatio= n as it is used in the OSPF DBD packets and for LSA packing. Of course, we=E2= =80=99d require a more accurate draft name and title. > =20 > Thanks, > Acee > =20 > From: Idr on behalf of Susan Hares > Date: Monday, November 9, 2020 at 4:20 PM > To: "'Stephane Litkowski (slitkows)'" , IDR List > Subject: Re: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu (11/1/202= 0 to 11/16/2020) > =20 > Stephane: > =20 > My second message to this thread asked a few questions about the technolog= y. =20 > =20 > This information can be more than IGP information. If SR segments static= ally defined (static or direct interfaces) tunnels and pass the endpoints vi= a BGP tunnel-encaps draft with SR Policy tunnel type, this can just be BGP. > =20 > I=E2=80=99ll keep this WG adoption call going until we can be sure if: 1)= it something LSR wants to standardize, and 2) whether there is a BGP only c= ase. It is clear to me that standardizing MTU for a SR segments with stack= ed tunnel segments passed by BGP was useful. > =20 > The authors should be the ones to propose this in LSR. =20 > =20 > Cheers, Sue > =20 > From: Idr [mailto:idr-bounces@ietf.org] On Behalf Of Stephane Litkowski (s= litkows) > Sent: Monday, November 9, 2020 4:28 AM > To: Susan Hares; idr@ietf.org > Subject: Re: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu (11/1/202= 0 to 11/16/2020) > =20 > Hi Sue, > =20 > > The purpose behind this mechanism is to reduce administrative work rathe= r than to reduce the review on drafts. > =20 > That=E2=80=99s exactly my point. If we don=E2=80=99t do OSPF extension now= and in the same draft, we leave a gap that will require a new draft for a v= ery very small extension. Just adds process overhead for nothing=E2=80=A6 > =20 > =20 > Stephane > =20 > =20 > From: Susan Hares > Sent: lundi 9 novembre 2020 10:10 > To: Stephane Litkowski (slitkows) ; idr@ietf.org > Subject: RE: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu (11/1/202= 0 to 11/16/2020) > =20 > Stephane: > =20 > I want to pick up on your email from two points: > =20 > 1) Why not do everything in LSR?=20 > > If the feature comes with interest in doing all 3 (ISIS, OSPF, and BGP-LS d= ata gathering), then the authors may select to do everything in LSR rather t= han have 2 or 3 drafts to maintain. > =20 > This is optional and the mechanism may not fit every draft. The drafts m= ay also start out adopted and vetted in LSR and IDR. The purpose behind t= his mechanism is to reduce administrative work rather than to reduce the rev= iew on drafts. > =20 > > =20 > =20 > 2) TRILL implementations of IS-IS has some MTU subTLV -=20 > =20 > If you are interested in whether this has been implemented in TRILL, you m= ight want to check with Donald Eastlake. My vague and foggy recollection i= s that had some implementations or came from pre-TRILL implementations. > =20 > =20 > Cheers, Susan Hares > =20 > =20 > =20 > From: Stephane Litkowski (slitkows) [mailto:slitkows@cisco.com] > Sent: Wednesday, November 4, 2020 3:03 AM > To: Susan Hares; idr@ietf.org > Subject: RE: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu (11/1/202= 0 to 11/16/2020) > =20 > Hi, > =20 > =E2=80=9Ca) Are there ways to pass IGP link MTUs in > the IGPs? If so, is this needed in BGP-LS=E2=80=9D > =20 > This is a valid point, most of the time BGP-LS is feeded by IGP LSDBs (of c= ourse there are other ways too). While I see that IS-IS has some MTU subTLV c= oming from TRILL RFC7176 (possibly never been implemented), I don=E2=80=99t s= ee anything for OSPF (I=E2=80=99m not an OSPF expert, so I may have missed i= t). > Shouldn=E2=80=99t this be checked and validated with LSR WG before adoptin= g ? > =20 > =20 > Stephane > =20 > =20 > From: Idr On Behalf Of Susan Hares > Sent: lundi 2 novembre 2020 06:04 > To: idr@ietf.org > Subject: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu (11/1/2020 to= 11/16/2020) > =20 > This begins a 2 week WG adoption call for > draft-zhu-idr-bgp-ls-path-mtu-04.txt (11/1 =E2=80=93 11/16/2020). > =20 > The authors should send in an IPR statement for this draft > by 11/5 so the WG can include the IPR status in their decision. > =20 > You can access the draft at: > https://datatracker.ietf.org/doc/draft-zhu-idr-bgp-ls-path-mtu/ > =20 > Since this draft is reference by an existing IDR draft > I=E2=80=99ve included a bit of background below to help you place =20 > this draft into the larger context of the SR additions to BGP-LS > and the draft-ietf-idr-tunnel-encaps-19.txt. > =20 > This draft does continue BGP-LS additions. if you > are opposed to any BGP-LS additions rather than > this specific addition, please make that clear in your > comment in this discussion. =20 > =20 > The authors requested a WG adoption at IETF 108.=20 > The IDR co-chairs thank the authors for their patience. =20 > This draft has been delayed by process of having a > new document shepherd (Sue Hares) come up to speed > on draft-ietf-idr-tunnel-encapsulation. > =20 > Cheers, Sue > =20 > Background > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D > Segment Routing technology creates SR tunnels that are > directly overlaid on MPLS or SRv6. While existing MPLS technology > (LDP and RSV-TE) provides mechanisms to negotiate path MTU > based on individual link MTU limits, the Segment Routing (SR) > on BGP-LS Link Attribute does not pass information on > MTU size per link. =20 > =20 > draft-ietf-idr-sr-policy-path-mtu-02.txt sends PATH MTU > information in the tunnel-encapsulation attribute for the tunnel type =20 > SR-Policy that handles segment routing (SR) paths. =20 > However, it lacks the information to create a reasonable > Path size since the BGP-LS Link Attribute does distribute > this information. > =20 > The draft proposes adding a new sub-TLV for MTU size > to the BGP-LS Link Attribute TLV, and > draft-ietf-idr-sr-policy-path-mtu-02.txt mentions this > draft as one possible way to distribute the per link > MTU. =20 > =20 > Questions for the authors might be: > a) Are there ways to pass IGP link MTUs in > the IGPs? If so, is this needed in BGP-LS > =20 > b) What other mechanisms pass link MTU? =20 > =20 > =20 > =20 > =20 > =20 > =20 > =20 > _______________________________________________ > Idr mailing list > Idr@ietf.org > https://www.ietf.org/mailman/listinfo/idr --Apple-Mail-B680E85A-C852-4710-A6C5-D63AEC1D35A6 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable To add to Les=E2=80=99s point of BGP only s= cenario, during MSD IESG reviews, BGP-LS only deployment was found not well c= haracterized and had been removed from the draft. It will require much bette= r discussion to have it included.

Regards,
Jeff<= /div>

On Nov 13, 2020, a= t 15:57, Les Ginsberg (ginsberg) <ginsberg@cisco.com> wrote:

=EF=BB=BF

The points which Ketan has made regarding the use of M= TU advertisements defined in RFC 7176 are very valid. Indeed, the contents o= f the sub-TLV defined in https://= www.rfc-editor.org/rfc/rfc7176.html#section-2.4 depend upon the TRILL sp= ecific MTU-probe/MTU-ack procedures defined in https://www= .rfc-editor.org/rfc/rfc6325#section-4.4.3. These procedures are not curr= ently applicable to non-TRILL environments.

 

So, there are no existing IGP advertisements defined w= hich can support the goals of this draft.

 

As Ketan has also indicated, there is no discussion i= n the draft of how a BGP only network (for example) could provide the inform= ation of interest.

 

=46rom my perspective, WG adoption of this draft in A= NY WG is premature.

This might be a useful functionality to have =E2=80=93= but at the moment we simply have an idea with no definition of how to imple= ment/deploy it.

 

So I therefore oppose WG adoption of this draft by ID= R.

 

Continuing the discussion is certainly useful =E2=80=93= and I would encourage the current authors to investigate and propose releva= nt mechanisms in all the protocols of interest in some future version of the draft.

At that point we could then have a far more meaningfu= l WG adoption call.

 

   Les

 

 

From: Idr <idr-bounces@ietf.org> On Behalf Of Ketan Talaulikar (ketant)
Sent: Friday, November 13, 2020 1:35 AM
To: Susan Hares <shares@ndzh.com>; 'Jeff Tantsura' <jefftant= .ietf@gmail.com>; 'Stephane Litkowski (slitkows)' <slitkows=3D40cisco.= com@dmarc.ietf.org>; idr@ietf.org; 'Acee Lindem (acee)' <acee=3D40cisc= o.com@dmarc.ietf.org>
Cc: lsr@ietf.org
Subject: Re: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu (11/= 1/2020 to 11/16/2020)

 

Hi Authors,

 

I believe this work is useful and shou= ld be taken up. It has value in providing the link MTU as part of the topolo= gy information via BGP-LS. However, as pointed out by others on this thread, the draft should remain scoped to just that =E2= =80=93 i.e. providing link MTU information. The discussion related to Path M= TU and applicability to SR networks are best left outside the scope of this s= tandards track draft.

 

Hi Sue,

 

I would support the points made by Ace= e for not taking up this draft in IDR WG and instead doing this in LSR.

 

Besides the missing coverage for OSPFv= 2/v3, there are also issues with how this would work with ISIS. The referenc= e to the ISIS Trill specification points to this TLV https://too= ls.ietf.org/html/rfc7176#section-2.4 =E2=80=93 if you see, there is more= here than just the MTU value. What is more critical is the ISIS procedures (= in non-Trill deployments) on how this value is determined. Please do not mix the following :

 

The MTU sub-TLV is used to option= ally announce the MTU of a link as

   specified in [RFC6325], S= ection 4.2.4.4.

 

Are the authors trying to specify that= these Trill procedures for testing MTU need to be adopted for regular ISIS d= eployments.

 

My take is that while the ISIS TLV def= ined for Trill may be re-used in normal ISIS deployments, its usage and proc= edures need to be specified. Copying the LSR WG so that I may be corrected if I am wrong here.

 

Coming to the point of BGP-only networ= ks, the draft has zero text related to that scenario. Moreover, the procedur= es for BGP-LS advertisements in BGP only fabric need to be specified as a base. The https://datatracker.ietf.org/doc/draft-ketant-idr-bgp-ls-bgp-only-fabric/ was my attempt to specify those procedures and it would be great if the ID= R WG could review and provide feedback to this document and consider for ado= ption so we can cover the BGP-only networks.

 

I would also like to offer support/hel= p to the authors in adding the necessary OSPFv2/v3 support for the same in a= n LSR draft where we could tackle both the IGPs and BGP-LS encoding and procedures together.

 

Thanks,

Ketan

 

From: Idr <idr-bounces@ietf.org> On Behalf Of Susan Hares
Sent: 13 November 2020 00:20
To: 'Jeff Tantsura' <je= fftant.ietf@gmail.com>; 'Stephane Litkowski (slitkows)' <slitkows=3D40cisco.com@dmarc.= ietf.org>; idr@ietf.org; 'Acee Lindem (acee)' <<= a href=3D"mailto:acee=3D40cisco.com@dmarc.ietf.org">acee=3D40cisco.com@dmarc= .ietf.org>
Subject: Re: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu (11/= 1/2020 to 11/16/2020)

 

Jeff and Authors of draft-zhu-idr-bgp-l= s-path-mtu:

 

I do believe the authors agreed to rena= ming the draft.   

 

Does the name:   draft-xxx-id= r-bgp-ls-link-mtu work for

the authors and interested IDR particip= ants.

 

As the end of 12 days of the 14 day WG L= C, this draft appears

to have general consensus from the WG a= s a useful draft.

 

I plan to allow 2 more days of comment,= but at this point

it appears the WG wishes to adopt this d= raft. 

 

Here=E2=80=99s my understanding of the b= est way forward:

 

If LSR adopts a version of the draft, I= DR will allow the

LSR WG to be the main source as long as= cross-working

review occurs so the BGP-only function c= an be reviewed.

 

Please continue to comment on the draft= and

the planned progression.

 

Cheers,  Sue

 

From: Jeff Tantsura [mailto:jefftant.ietf@gmail.com]
Sent: Thursday, November 12, 2020 12:53 PM
To: Susan Hares; Stephane Litkowski (slitkows); idr@ietf.org; Acee Lindem (acee)
Subject: Re: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu (11/= 1/2020 to 11/16/2020)

 

+1 to everything Acee said

 

Cheers,

Jeff

On Nov 10, 2020, 1:01 P= M -0800, Acee Lindem (acee) <acee=3D40cisco.com@dmarc.ietf.org>, wrote:

Speaking as an IDR WG member:

 

The name of the draft is wrong =E2=80=93 the extension is for a Link= MTU and not a path MTU.

 

Speaking as LSR Chair:

 

We could this in LSR as there is currently no MTU advertisement in t= he LSAs for OSPFv2 and OSPFv3. Implementations already make use of this info= rmation as it is used in the OSPF DBD packets and for LSA packing. Of course, we=E2=80=99d require a more acc= urate draft name and title.

 

Thanks,

Acee

 

From: = Idr <idr-bounces@ietf.org>= on behalf of Susan Hares <shares@ndzh= .com>
Date: Monday, November 9, 2020 at 4:20 PM
To: "'Stephane Litkowski (slitkows)'" <slitkows=3D40cisco.com@dmarc.ietf.org>, I= DR List <idr@ietf.org>
Subject: Re: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu (11/= 1/2020 to 11/16/2020)

 

Stephane:

 

My second message to this thread asked a few q= uestions about the technology.   

 

This information can be more than IGP informat= ion.   If SR segments statically defined (static or direct interfa= ces) tunnels and pass the endpoints via BGP tunnel-encaps draft with SR Poli= cy tunnel type, this can just be BGP.

 

I=E2=80=99ll keep this WG adoption call going u= ntil we can be sure if:  1) it something LSR wants to standardize, and 2= ) whether there is a BGP only case.   It is clear to me that stand= ardizing MTU for a SR segments with stacked tunnel segments passed by BGP was useful.

 

The authors should be the ones to propose this= in LSR.       

 

Cheers,  Sue

 

From: I= dr [mailto:idr-bounces@ietf.org]= On Behalf Of Stephane Litkowski (slitkows)
Sent: Monday, November 9, 2020 4:28 AM
To: Susan Hares; idr@ietf.org
= Subject: Re: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu (11/= 1/2020 to 11/16/2020)

 

Hi Sue,

 

> The purpose behind this mechanism is to r= educe administrative work rather than to reduce the review on drafts.=

 

That=E2=80=99s exactly my point. If we don=E2=80=99t do OSPF extension now a= nd in the same draft, we leave a gap that will require a new draft for a ver= y very small extension. Just adds process overhead for nothing=E2=80=A6=

 

 

Stephane

 

 

From: Susan Hares <shares@ndzh.= com>
Sent: lundi 9 novembre 2020 10:10
To: Stephane Litkowski (slitkows) <slitkows@cisco.com>; idr@ietf.org
Subject: RE: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu (11/= 1/2020 to 11/16/2020)

 

Stephane:

 

I want to pick up on your email from two point= s:

 

1)  Why not do everything in LSR? 

<WG-chair hat>

If the feature comes with interest in doing al= l 3 (ISIS, OSPF, and BGP-LS data gathering), then the authors may select to d= o everything in LSR rather than have 2 or 3 drafts to maintain.<= /o:p>

 

This is optional and the mechanism may not fit= every draft.   The drafts may also start out adopted and vetted i= n LSR and IDR.    The purpose behind this mechanism is to red= uce administrative work rather than to reduce the review on drafts.

 

</wg-chair hat off>

 

 

2) TRILL implementations of IS-IS has s= ome MTU subTLV - 

 

If you are interested in whether this has been implemented in TRILL, you mig= ht want to check with Donald Eastlake.   My vague and foggy recoll= ection is that had some implementations or came from pre-TRILL implementatio= ns.

 

 

Cheers, Susan Hares

 

 

 

From: S= tephane Litkowski (slitkows) [mailto:s= litkows@cisco.com]
Sent: Wednesday, November 4, 2020 3:03 AM
To: Susan Hares; idr@ietf.org
= Subject: RE: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu (11/= 1/2020 to 11/16/2020)

 

Hi,

 

=E2=80=9Ca) Are there ways to pass IGP link MTUs in

the IGPs?  If so, is this needed in BGP-LS=E2=80=9D

 

This is a valid point, most of the time BGP-LS is feeded by IGP LSDBs (of co= urse there are other ways too). While I see that IS-IS has some MTU subTLV c= oming from TRILL RFC7176 (possibly never been implemented), I don=E2=80=99t s= ee anything for OSPF (I=E2=80=99m not an OSPF expert, so I may have missed it).

Shouldn=E2=80=99t this be checked and validated with LSR WG before adopting ?=

 

 

Stephane

 

 

From: Idr <idr-bounces@iet= f.org> On Behalf Of Susan Hares
Sent: lundi 2 novembre 2020 06:04
To: idr@ietf.org
Subject: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu (11/1/20= 20 to 11/16/2020)

 

This begins a 2 week WG adoption call for

draft-zhu-idr-bgp-ls-path-mtu-04.txt (11/1 =E2=80=93 11/16/2020).=

 

The authors should send in an IPR statement for this draft

by 11/5 so the WG can include the IPR status in their decision.

 

You can access the draft at:

= https://datatracker.ietf.org/doc/draft-zhu-idr-bgp-ls-path-mtu/

 

Since this draft is reference by an existing IDR draft

I=E2=80=99ve included a bit of background below to help you place  

this draft into the larger context of the SR additions to BGP-LS<= /p>

and the draft-ietf-idr-tunnel-encaps-19.txt.

 

This draft does continue BGP-LS additions.  if you

are opposed to any BGP-LS additions rather than

this specific addition, please make that clear in your

comment in this discussion.  

<= span dir=3D"LTR"> 

The authors requested a WG adoption at IETF 108. 

The IDR co-chairs thank the authors for their patience.   

This draft has been delayed by process of having a

new document shepherd (Sue Hares) come up to speed

on draft-ietf-idr-tunnel-encapsulation.

 

Cheers, Sue

 

Background

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

Segment Routing technology creates SR tunnels that are

directly overlaid on MPLS or SRv6.  While existing MPLS technology=

(LDP and RSV-TE) provides mechanisms to negotiate path MTU

based on individual link MTU limits, the Segment Routing (SR)

=

on BGP-LS Link Attribute does not pass information on

MTU size per link.   

 

draft-ietf-idr-sr-policy-path-mtu-02.txt sends PATH MTU

information in the tunnel-encapsulation attribute for the tunnel type  =

SR-Policy that handles segment routing (SR) paths.     &= nbsp; 

However, it lacks the information to create a reasonable

Path size since the BGP-LS Link Attribute does distribute

this information.

 

The draft proposes adding a new sub-TLV for MTU size

to the BGP-LS Link Attribute TLV, and

draft-ietf-idr-sr-policy-path-mtu-02.txt mentions this

draft as one possible way to distribute the per link

MTU.  

 

Questions for the authors might be:

a) Are there ways to pass IGP link MTUs in

the IGPs?  If so, is this needed in BGP-LS

 

b) What other mechanisms pass link MTU?   

 

 

 

 

 

 

 

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(ketant)" , "Stephane Litkowski (slitkows)" , "Acee Lindem (acee)" , "lsr@ietf.org" , Susan Hares Thread-Topic: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu (11/1/2020 to 11/16/2020) Thread-Index: AdawzOgQ6Lr8VUABQe2O6Y7iaRDQVwBcPlsAAP3GFgAAAKbkAAAY2XWAADGmGIAAXf3yAAACBKCAAB7jTQAAHiP5gAAD/qoAACHXI3A= Date: Sat, 14 Nov 2020 10:06:05 +0000 Message-ID: References: In-Reply-To: Accept-Language: zh-CN, en-US Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.108.201.194] Content-Type: multipart/alternative; boundary="_000_e1091af16c32484ebe3497f94b6b4b3bhuaweicom_" MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: Re: [Lsr] [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu (11/1/2020 to 11/16/2020) X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 14 Nov 2020 10:06:25 -0000 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<095760a7fdde4c01b4757cf66656a723@huawei.com> From: Robert Raszuk Date: Sat, 14 Nov 2020 11:13:38 +0100 Message-ID: To: Huzhibo Cc: "Les Ginsberg (ginsberg)" , "Ketan Talaulikar (ketant)" , Susan Hares , Jeff Tantsura , "Stephane Litkowski (slitkows)" , "idr@ietf.org" , "Acee Lindem (acee)" , "lsr@ietf.org" Content-Type: multipart/alternative; boundary="000000000000a5a79105b40e661b" Archived-At: Subject: Re: [Lsr] =?utf-8?b?W0lkcl0g562U5aSNOiBXRyBBZG9wdGlvbiBmb3IgZHJhZnQt?= =?utf-8?q?zhu-idr-bgp-ls-path-mtu_=2811/1/2020_to_11/16/2020=29?= X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 14 Nov 2020 10:13:52 -0000 --000000000000a5a79105b40e661b Content-Type: text/plain; charset="UTF-8" Hi Huzhibo, I would like to highlight another aspect of this draft independent in which (if any) WG it will end up with. Many network operators today to interconnect their routers purchase circuits. However those circuits in vast majority use brilliant technology of VPWS, L2VPN, EVPN ... you name it. So effectively the circuit is just an illusion and what is really sold is an emulated circuit running as IP encapsulated L2 packets on someone IP backbone. And here comes the crux of the issue - depending on the time of the day, state and events in the carrier's underlay real MTU changes. And today what is worse routers have no good way to even detect it. Some attempts pop up here and there (like stuff BFD to 1500 or so), but the point is that what could be promised, sold and configured on the interface may not be what is really under the hood. Things get even more colorful when only some discrete packet sizes fail while smaller and bigger go through just fine - Swiss-MTU if you will :) Sure your proposal just uses static MTU like any other mentioned in your draft consumer of that information but I am bringing it here for two reasons: A) Draft needs to consider this problem and discuss dynamics related to real MTU changes B) A discussion needs to be started if it would not be much more effective to simply detect MTU at the data plane between the src and dst in an end to end fashion rather then using it in control plane as a atomic piece of assumed truth used to make any path calculation. Kind regards, R. --000000000000a5a79105b40e661b Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi=C2=A0Huzhibo,=C2=A0

I wou= ld like to highlight another aspect of this draft independent in which (if = any) WG it will end up with.=C2=A0

Many network op= erators today to interconnect=C2=A0their routers=C2=A0purchase circuits. Ho= wever those circuits in vast majority=C2=A0use brilliant technology of VPWS= , L2VPN, EVPN ... you name it. So effectively the circuit is just an illusi= on=C2=A0and what is really sold is an emulated circuit running as IP encaps= ulated=C2=A0L2 packets on someone IP backbone.=C2=A0

And here comes the crux of the issue - depending on the time of the day,= state and events in the carrier's underlay real MTU changes. And today= what is worse routers have no good way to even detect it. Some attempts po= p up here and there (like stuff BFD to 1500 or so), but the point is that w= hat could be promised, sold and configured on the interface may not be what= is really under the hood.=C2=A0

Things get even m= ore colorful when only some discrete=C2=A0packet sizes fail while smaller a= nd=C2=A0bigger go through=C2=A0just fine - Swiss-MTU if you will :)

Sure your proposal just uses static MTU like any other me= ntioned in your draft consumer of that information=C2=A0but I am bringing i= t here for two reasons:=C2=A0

A) Draft needs to co= nsider this problem and discuss dynamics related to real MTU changes=C2=A0<= /div>

B) A discussion needs to be started if it would no= t be much more effective to simply detect MTU at the data plane between the= src and dst in an end to end fashion rather then using it in control plane= as a atomic piece of assumed truth used to make any path calculation.=C2= =A0

Kind regards,
R.

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d=raszuk.net; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=22rQ52h83kxX6EH/BnC2JyIDJR/d9ouFzvf/NiOwDNg=; b=S/JjmSIH47pt/mJ1HsajkFyNGHPBfDW6xSFelvuM8A1IA1OnYElIWu71sn7QEAZ7zK wK681PQQjTM4VirsH8fymVNarMKWgHFNY2ah3pPVs08rxItzszYeVlIefCz9KL6TwtVe 1v/MKl1etsU25BZV8sVxxnIrs3D30lbEH/cRS83jzxWM2ikvTcYcjrywc2Kqm6iPvCnI kOBMq/R/ZcjxNZ/7FRBhlxWw235evo4280VMqUobrhlL8iaXtGN8m3DuhvIo4Ro8E0Z2 0FrnRhcqlfptHd3QlIezqHoIOgL/TIeJrPgZhvgBbPXFYRa49V5eNFOyY1pEafMEZ6vp 7XSQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=22rQ52h83kxX6EH/BnC2JyIDJR/d9ouFzvf/NiOwDNg=; b=Udf4nSwd8U4vEsn5+ndR4pNe/1LRzOAtI4Je347gZxIkJo3JJMUae9ugSBDBApRZgk 1sn1U0ZUaUWxXMrq2w/D2nUJGPgTZ3saq1g7KXi1X6gburN74NYe2lKciKSttecJdyY/ DvbEIs7UAAQBPg2cxJ4ieLh/xZ8nbyab2KwMbfhS9khBOVQnklcE+Ex2cjaiSd0u5aC/ Z3rGlTmMRPqlU9d7eyD0bLgz2iJ9v/PWgK38/KP6fo7GABUiAgwdizIT42wVh0neCEGp /JsoUr61kO4FCOhOhL0lZ0xZd/Dwi41+mnim+gat2QsxWS1sAWpXvnd7kliGs99z2CY4 HuPQ== X-Gm-Message-State: AOAM533MtdjtvFX/H31OW7hvCff9r+p/GTJt04vFkgdbRb9ffASLOumd T6bYVHB0Rwd2CUsaheR29iI2eN/Lch3XubNPX4j94aAZIxzZYA== X-Google-Smtp-Source: ABdhPJxWjvFqoLKWt9ECNzu7i4QVTn3KznghgPbChOjtKUSAw5RdN30/ZtpqCNxPp+3Lt1vTwg5F1F2NE7wmP90Kiak= X-Received: by 2002:a05:6512:3606:: with SMTP id f6mr3393994lfs.12.1605393029374; Sat, 14 Nov 2020 14:30:29 -0800 (PST) MIME-Version: 1.0 References: In-Reply-To: From: Robert Raszuk Date: Sat, 14 Nov 2020 23:30:20 +0100 Message-ID: To: "Acee Lindem (acee)" Cc: "lsr@ietf.org" Content-Type: multipart/alternative; boundary="0000000000003db40505b418b11c" Archived-At: Subject: Re: [Lsr] Prefix Unreachable Announcement Use Cases X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 14 Nov 2020 22:30:34 -0000 --0000000000003db40505b418b11c Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi Acee, > 3.1 *Inter-Area Node Failure Scenario =E2=80=93 *With respect to this use= case, the node > in question is actually unreachable. In this case, the ABRs will normally install a > reject route for the advertised summary and will send an ICMP unreachable when > the packets are received for the unreachable prefix. And what will the network do with such ICMP unreachable ? Is there some draft I missed where encapsulating PE will choose a path with different tunnel endpoint upon reception of ICMP unreachable message ? See the entire idea behind this draft is to trigger faster switchover to other PEs in the case of a multihomed attached site. Option 1 - withdraw a service route in BGP. Use aggregate withdraw to speed this up (say withdraw just RDs) Option 2 - signal next hop unreachability (aka negative route) of more specific prefix then the aggregate itself. While I think just option 1 is ok for the vast majority of services your answer seems to be talking about ICMP unreachable which IMO would not help much with the issue. The proposal is not about failing ... the proposal is about faster connectivity restoration. > If faster detection is required, BFD or other mechanisms are available. Now running a full mesh of BFD multihop sessions from each PE to each other PE may be ok in theory but rather no-op in practice. Just think 1000 PEs with 100 ms BFD timers in a full mesh of BFD sessions. Then rethink the same with BFD packets maxed to 1500 or 4K bytes packets as per some proposals floating around. If we want to move that way I would rather suggest we define a local BFD anchor explorers (one per area) which will probe all "interesting" next hops in a given area. Upon failure it would signal to those remote PEs which indicated interest in such tracking the event of failure. Again using BFD for this in any form or shape needs to be weighed for cost/benefit against option 1 and option 2 above. Thx, Robert. PS . Now option 1 can easily be sub second if BFD is enabled on IBGP sessions between RRs and PEs. However I think there was some concerns expressed in the past by a vendor for this type of deployment of BFD between loopbacks. Maybe it would be beneficial for this discussion to better understand this concern. If valid I think the option 2 which IMO is the objective of this draft does present a valid problem to be solved. Today practically speaking networks flood in IGPs globally 1000s of /32 prefixes instead of summarizing them as this is the only way they can signal liveness of the remote PEs. On Sat, Nov 14, 2020 at 10:34 PM Acee Lindem (acee) wrote: > Speaking as WG member=E2=80=A6 > > > > With respect to the use cases in section 3: > > > > 3.1 *Inter-Area Node Failure Scenario =E2=80=93 *With respect to this u= se case, > the node in question is actually unreachable. In this case, the ABRs will > normally install a reject route for the advertised summary and will send = an > ICMP unreachable when the packets are received for the unreachable prefix= . > This is the expected behavior and there really isn=E2=80=99t that much of= advantage > to move the point of unreachable detection a couple hops closer. If faste= r > detection is required, BFD or other mechanisms are available. > > > > 3.3 *Intra-Area Node Failure Scenario *=E2=80=93 In the first place, mu= ltiple > areas with overlapping summaries is just a bad network design. If the > prefix is unreachable, the case digresses to getting the ICMP unreachable > from the ABR with the invalid overlapping summary. > > > > 3.2 *Inter-Area Links Failure Scenario =E2=80=93 *This is the case where = the > prefix is reachable but only through a subset of the area ABRs. This is > really the only valid use case. IMO, it is better to solve this case with > intra-area tunnels through the backbone as described in section 6.1. I > think this is preferable to the complexity proposed in this draft and > especially section 6. It is =E2=80=9Cinteresting=E2=80=9D when non-implem= entors specify > implementation details. > > > > Thanks, > Acee > > > > > > > > > > > > > > > > > _______________________________________________ > Lsr mailing list > Lsr@ietf.org > https://www.ietf.org/mailman/listinfo/lsr > --0000000000003db40505b418b11c Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Acee,

> 3.1=C2=A0Inter-Area Node= Failure Scenario =E2=80=93=C2=A0Wi= th respect to this use case, the node=C2=A0
> in question is actually unreachable. In this cas= e, the ABRs will normally install a=C2=A0
> reject route for the advertised summary and will s= end an ICMP unreachable when=C2=A0
> the packets are received for the unreachable prefix.=C2=A0

And what will the network do with such IC= MP unreachable ? Is there some draft I missed where encapsulating PE will c= hoose a path with different tunnel endpoint upon reception of ICMP unreacha= ble message ?=C2=A0

See the entire idea behind thi= s draft is to trigger faster switchover to other=C2=A0PEs in the case of a = multihomed=C2=A0attached site.=C2=A0

Option 1 - wi= thdraw a service route in BGP. Use aggregate withdraw to speed this up (say= withdraw just RDs)=C2=A0

Option 2 - signal next h= op unreachability (aka negative route) of more specific prefix then the agg= regate itself.=C2=A0

While I think just option 1 i= s ok for the vast majority=C2=A0of services your answer seems to be talking= about ICMP unreachable which IMO would not help much with the issue. The p= roposal is not about=C2=A0failing ... the proposal is about faster connecti= vity restoration.=C2=A0

> If faster detection is required, BFD or other mechanisms are= available.=C2=A0=C2=A0

Now running a f= ull mesh of BFD multihop sessions from each PE to each other PE may be ok i= n theory but rather no-op in practice. Just think 1000 PEs with 100 ms BFD = timers in a full mesh of BFD sessions. Then rethink the same with=C2=A0 BFD= packets maxed to 1500 or 4K bytes packets as per some proposals floating a= round.=C2=A0

If we want to move that way I would r= ather suggest we define a local BFD anchor explorers (one per area) which w= ill probe all "interesting" next hops in a given area. Upon failu= re it would signal to those remote PEs which indicated interest in such tra= cking the event of failure.=C2=A0

Again using BFD = for this in any form or shape needs to be weighed for cost/benefit against = option 1 and option 2 above.=C2=A0

Thx,
Robert.= =C2=A0

PS . Now option 1 can easily be sub second = if BFD is enabled on IBGP sessions between RRs and PEs. However I think the= re was some concerns expressed in the past by a vendor for this type of dep= loyment of=C2=A0BFD between loopbacks. Maybe it would be beneficial for thi= s discussion to better understand this concern. If valid I think the option= 2 which IMO is the objective of this draft does present a valid problem to= be solved. Today practically speaking networks flood in IGPs globally 1000= s of /32 prefixes instead of summarizing them as this is the only way they = can signal liveness of the remote PEs.=C2=A0


<= /div>


On Sat, Nov 14, 2020 at 10:34 PM Acee Lindem (acee) <= ;acee=3D40cisco.com@dmarc.iet= f.org> wrote:

Speaking as WG member= =E2=80=A6

=C2=A0<= /span>

With respect to the u= se cases in section 3:

=C2=A0<= /span>

=C2=A0 3.1 Inter-A= rea Node Failure Scenario =E2=80=93 With respect to this use case, the node in question is actually unreach= able. In this case, the ABRs will normally install a reject route for the a= dvertised summary and will send an ICMP unreachable when the packets are re= ceived for the unreachable prefix. This is the expected behavior and there really isn=E2=80=99t that much of = advantage to move the point of unreachable detection a couple hops closer. = If faster detection is required, BFD or other mechanisms are available.

=C2=A0<= /span>

=C2=A0 3.3 Intra-A= rea Node Failure Scenario =E2=80=93 In the first place, multiple areas with overlapping summaries= is just a bad network design. If the prefix is unreachable, the case digre= sses to getting the ICMP unreachable from the ABR with the invalid overlapp= ing summary.

=C2=A0<= /span>

3.2 Inter-Area Lin= ks Failure Scenario =E2=80=93 This is the case where the prefix is reachable but only through a subse= t of the area ABRs. This is really the only valid use case. IMO, it is bett= er to solve this case with intra-area tunnels through the backbone as descr= ibed in section 6.1. I think this is preferable to the complexity proposed in this draft and especially sect= ion 6. It is =E2=80=9Cinteresting=E2=80=9D when non-implementors specify im= plementation details.

=C2=A0<= /span>

Thanks,
Acee

=C2=A0<= /span>

=C2=A0<= /span>

=C2=A0<= /span>

=C2=A0<= /span>

=C2=A0<= /span>

=C2=A0<= /span>

=C2=A0<= /span>

=C2=A0<= /span>

_______________________________________________
Lsr mailing list
Lsr@ietf.org
https://www.ietf.org/mailman/listinfo/lsr
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lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B1A6B3A102F for ; Sun, 15 Nov 2020 02:49:05 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.098 X-Spam-Level: X-Spam-Status: No, score=-2.098 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=raszuk.net Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id V0NvFK-01jQo for ; Sun, 15 Nov 2020 02:49:04 -0800 (PST) Received: from mail-lj1-x229.google.com (mail-lj1-x229.google.com [IPv6:2a00:1450:4864:20::229]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 09D0E3A102D for ; Sun, 15 Nov 2020 02:49:03 -0800 (PST) Received: by mail-lj1-x229.google.com with SMTP id s9so16180400ljo.11 for ; Sun, 15 Nov 2020 02:49:03 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=raszuk.net; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=6BbR4/ekjUkXy6n1C7d8xPOzspKCo1fc6oTae4tgZgY=; b=IcnYSBan78+D8POYmJibGzQ5jWegduuHXkgpdpPP4o06S8nWpgE7uDZPbzWvBVC4RV QFhm9bhGgJRnMtshN/4Tx+ydmAxktVDwmUAXx7a/UETqbd2ZnRD3pTlikPs4JZLCsLVq LtiTJjAHrE3QaSgCDugb4QOmWHNvfnur2vQuS3PVz8bmsY4eqrxaLjk0emQW5VjOot1f Ego2efH4XAchrLeZXrM1SdzcxbvjGz8hyQXmiaYXwxgB7nxs0nyN+kv5GvjOPpLtoJS/ /VThvfvH1Je2MbmA5uXij6djjbssDpB8AB/6ctlXPAHd9akMC40L9kdcL6ryQnX8GCQy iAjQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=6BbR4/ekjUkXy6n1C7d8xPOzspKCo1fc6oTae4tgZgY=; b=YHspVE7RsbGDltwZK06EjPFa2Uw2j8p/giODekAdP8TX32TYuOl5nWKQNaSVEW9G9y nnQP34CaD/2rj+S48LHF0feJuWnJqDjJtztKWFS32tuNyQOZ/Xxr4TeUhoAp+u91IgeS J4HRiIrnHkYT57o9CCndOmi9/4sMKbRWMD5iZuahROt2c6gvVAIRVzbnpKGZnX6MllkL TcxJZHXo9LxxHuR/hCkBu8o1YR+Z9W6Ll7fK34+7QdhnZojJQ9gpyn/bCP5JvQec4ceZ 2xvpQ7wXZazpFqcQQFePZ2jMCcLqQemXcR+1hJOp8n2F9qYU1E39Om4rRalZKm7CEWf8 Hihg== X-Gm-Message-State: AOAM530X20A0ILf0FsBnjBx4C++D4jYPERZODXOPXWRAvvucvaU+FhW7 bVh5YSppCFDXhP0bM040VJiiBMy+CcIxvDNgNIkzBt3QpC8= X-Google-Smtp-Source: ABdhPJzPmuNMZQ7kVkyOAQdiP7iosN74z5lwfqayi78YrKkni/J2iHQ9UJvTTh+5J7GayHOLRgkjCnKKPjA84a77Qho= X-Received: by 2002:a2e:b8c7:: with SMTP id s7mr3950983ljp.374.1605437342022; Sun, 15 Nov 2020 02:49:02 -0800 (PST) MIME-Version: 1.0 References: In-Reply-To: From: Robert Raszuk Date: Sun, 15 Nov 2020 11:48:51 +0100 Message-ID: To: =?UTF-8?B?546L54ix5L+K?= Cc: "Acee Lindem (acee)" , lsr Content-Type: multipart/alternative; boundary="0000000000007b149705b4230230" Archived-At: Subject: Re: [Lsr] Prefix Unreachable Announcement Use Cases X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 15 Nov 2020 10:49:06 -0000 --0000000000007b149705b4230230 Content-Type: text/plain; charset="UTF-8" Hi Aijun, As I think what you are proposing overall is useful let me in turn comment on some of your statements ... [WAJ] It is common, for example, ISIS level1-2 router will announce the >> default route to the level 1 area. And, also in the OSPF totally stubby >> area. >> > Well let's just take OSPF and imagine: Area1 --- ABR1 --- Area0 ---ABR2 --- Area2 So you are saying that unreachable should be always flooded/leaked domain wide. That's news - I was always thinking of this functionality only in the case when a summary route covering such more specific is present. Default should not count ... at least I am not sure if this is safe or makes sense at this point. [WAJ] The tunnel soultions described in section 6 is the last resort of the >> path switch procedure. If we deploy the PUA mechanism, normally the routers >> within another area will switch automatically to other ABR when it receives >> the PUA from one ABR. Only in the critical scenario that described in >> beginning of section 6, the solution described in section 6.1 or 6.2 will >> be used. >> > I think this is where you are starting to confuse people. In my option this solution should have nothing to do with selecting which ABR to use to cross area boundary. The cases when one ABR has full remote reachability and the other one partial one in my view are symptoms of a very poorly designed network and to stretch protocol thin to cover for those mistakes with a patch is not a good thing. I would actually trim most use cases leaving just one - to signal remote service node (ex: PE) going down in the presence of summary route being advertised from remote area or pop. Thx, R. --0000000000007b149705b4230230 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Aijun,

As I think what yo= u are proposing overall is useful let me in turn comment on some of your st= atements ...=C2=A0

[WAJ] It is common, = for example, ISIS level1-2 router will announce the default route to the le= vel 1 area. And, also in the OSPF totally stubby area.=C2=A0


<= div>Well let's just take OSPF and imagine:

=C2= =A0Area1 --- ABR1 --- Area0 ---ABR2 --- Area2=C2=A0

So you are saying that unreachable should be always flooded/leaked domain= wide. That's news - I was always thinking of this functionality only i= n the case when a summary route covering such more specific=C2=A0is present= . Default should not count ... at least I am not sure if this is safe or ma= kes sense at this point.=C2=A0


[WAJ] The tunne= l soultions described in section 6 is the last resort of the path switch pr= ocedure. If we deploy the PUA mechanism, normally the routers within anothe= r area will switch automatically to other ABR when it receives the PUA from= one ABR.=C2=A0 Only in the critical scenario that described in beginning o= f section 6, the solution described in section 6.1 or 6.2 will be used.

=
I think this is where you are starting to confuse people. In= my option this solution should have nothing to do with selecting which ABR= to use to cross area boundary.=C2=A0

The cases wh= en one ABR has full remote reachability and the other one partial one in my= view are symptoms of a very poorly designed=C2=A0network and to stretch pr= otocol thin to cover for those mistakes with a patch is not a good thing.= =C2=A0

I would actually trim most use cases leavin= g just one - to signal remote service node (ex: PE) going down in the prese= nce of summary route being advertised from remote area or pop.=C2=A0
<= div>
Thx,
R.
=C2=A0
--0000000000007b149705b4230230-- From nobody Sun Nov 15 04:05:02 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6E0BD3A1120; Sun, 15 Nov 2020 04:04:50 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.894 X-Spam-Level: X-Spam-Status: No, score=-1.894 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_NONE=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id HzfxsLQloNrk; Sun, 15 Nov 2020 04:04:48 -0800 (PST) Received: from mta8.iomartmail.com (mta8.iomartmail.com [62.128.193.158]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 3494D3A112B; Sun, 15 Nov 2020 04:04:44 -0800 (PST) Received: from vs2.iomartmail.com (vs2.iomartmail.com [10.12.10.123]) by mta8.iomartmail.com (8.14.4/8.14.4) with ESMTP id 0AFC4f3f006034; Sun, 15 Nov 2020 12:04:41 GMT Received: from vs2.iomartmail.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 5FE6122048; Sun, 15 Nov 2020 12:04:41 +0000 (GMT) Received: from asmtp2.iomartmail.com (unknown [10.12.10.249]) by vs2.iomartmail.com (Postfix) with ESMTPS id 499B922044; Sun, 15 Nov 2020 12:04:41 +0000 (GMT) Received: from LAPTOPK7AS653V ([87.112.234.140]) (authenticated bits=0) by asmtp2.iomartmail.com (8.14.4/8.14.4) with ESMTP id 0AFC4dpW024142 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Sun, 15 Nov 2020 12:04:39 GMT Reply-To: From: "Adrian Farrel" To: "'Gyan Mishra'" Cc: "'TEAS WG'" , , "'IDR List'" , "'lsr'" , "'BESS'" , "'BIER WG'" , "'SPRING WG'" References: In-Reply-To: Date: Sun, 15 Nov 2020 12:04:38 -0000 Organization: Old Dog Consulting Message-ID: <00d501d6bb47$7ee160a0$7ca421e0$@olddog.co.uk> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00D6_01D6BB47.7EE27210" X-Mailer: Microsoft Outlook 16.0 Thread-Index: AQF9YbXHIOSWBk8yeY9fu/naMBX0B6p7sJrg Content-Language: en-gb X-Originating-IP: 87.112.234.140 X-Thinkmail-Auth: adrian@olddog.co.uk X-TM-AS-GCONF: 00 X-TM-AS-Product-Ver: IMSVA-9.0.0.1623-8.2.0.1013-25790.007 X-TM-AS-Result: No--14.922-10.0-31-10 X-imss-scan-details: No--14.922-10.0-31-10 X-TMASE-Version: IMSVA-9.0.0.1623-8.2.1013-25790.007 X-TMASE-Result: 10--14.921600-10.000000 X-TMASE-MatchedRID: jFqw+1pFnMyx4Q5iE/G4VXFPUrVDm6jtrkGhd90/DD6ysPB8dBBorQkt GlyfnEqw/hPqYBjXRvrPRQhYb82CUWsWrPYGNN4DW4uRcqTgBLkDxXNNkwM2slY9yet6QEd8gXF 85i45Zx5Tycok6DUSPnBV0D37nd4oZb4YJkoMChswiJTf3kjwfauRJbBnR9QZE4klva9z5JyCdz yKMpTh4n0GH8UPE5XGeeOhgmVGz4sS887lpka72zCj6xe3SuezzwGOnesXThUDE8ggmrXnNIE/v INhyffjbALKww3fgKQ+IJsxz6/MG3PH+Ely1RppPE3khmVvHO5rakICcm9AUWNDqjXOO0YeCPIv P3uOlZdZMihSZb4ZQBFBD6+ejtliafdXgMs+pqB2GcWKGZufBQ4m7nrLKGA2JHwDAsNOgHhYXKg fzjvaWW342qvQHtJUfzzZvLDv3Oa2F9mW29B7siT9vTe4FHdQh8Ytn75ClDNhlbn6/nmOL9SE+o oSMqbWa2yjxi6DegzSPy86eVaxBAZzDl2stMKuzLo88rvlvYHR/CLTQxTQNLKeTtOdjMy6Y02UY ybf3M77zimhwE/anR6mA7svqvZCjlwExZ+3TSZfYa9W9OjitdZvZ5Gv+ByDw62uSG5kL1aNLo7J HtqcJUMJm1dGoan80AAsttmoS5lQdboikf/uEGwTEruL9ObTIfyQNHR2naZd9fDYSm945TdZExW GZtg3vRozbZIuTOAuNvTj5Xfp1u3FFtXLEvOmwP5c8K0bHlchjEPz8ZIh1hlLPW+8b7SaCSqvzM Gx6vFvy64TFAGuDliSlwChW1m5XC8g0bRla6SeAiCmPx4NwGmRqNBHmBve1B0Hk1Q1KyJck9lvx NcntWLHjeGkjh9XKzfM9B6IRt7+efAnnZBiL0OAfBu/XeE86LVkcqC+5HQYK8bS5pq70eGEvXqw fEwp6gc/7grXMri0yp4Dr5imaJLC9paZso429IKhPJLZpaVAdYFEV4Px7Pv1leB13UrM X-TMASE-SNAP-Result: 1.821001.0001-0-1-12:0,22:0,33:0,34:0-0 Archived-At: Subject: Re: [Lsr] [Bier] PCE Controller & SDN Controller & Netconf/Yang NMS Controller - lines blurred and can the names be used ubiquitously meaning the same X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 15 Nov 2020 12:04:51 -0000 This is a multipart message in MIME format. ------=_NextPart_000_00D6_01D6BB47.7EE27210 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Hi Gyan, =20 Sorry, I missed this (got caught on a filter cos it was a bit spammed to = a lot of lists :-). =20 > I have noticed that after reviewing many drafts across many WGs it = seems in the > industry that the lines seem to be blurred between a PCE controller, = ODL or > Openflow SDN Controller and a Netconf/Yang NMS Controller ZTP & Day X > provisioning. =20 Yes, blurriness our speciality. =20 You my find RFC 7491 useful in this respect, although it is a little = dated. And, of course, RFC 8283 is a good starting point. =20 > As this is a software sitting on a server you can have a swiss army = knife server that > does everything from PCE path computation to Netconf/Yang ZTP & Day N = > provisioning as well as any SDN Controller ODL or Openflow controller = type > functions as well. =20 Yes, and this is one of the risks of PCE as a shiny thing: that it be = converted from a useful toolkit into some form of god-box. I = pontificated on this way back in 2014 at = http://www.olddog.co.uk/PCEPandOnwards.pdf =20 > How this comes into play and realization of the lines being blurred is = the use of > BGP-LS in building the IGP topological graph of the network which was = designed > for PCEP and PCE & PCC active & passive off line path computation for = both > RSVP-TE or SR-TE path instantiation. =20 =20 In some senses, BGP-LS didn=E2=80=99t add anything because a PCE could = have snooped on the IGP. But BGP-LS provides an export mechanism and = importantly adds to that some policy filters to determine what is = exported thus giving the network some control over what is exported. =20 FWIW, https://datatracker.ietf.org/doc/draft-dhodylee-pce-pcep-ls/ = proposes using PCEP for the same function. The argument in favor is that = a PCE has to implement PCEP anyway, so why not include the LS export as = well. The argument against is that BGP-LS has wider applicability and = that it will typically be exported from an ASBR which already supports = BGP. =20 > However now BGP-LS can also be used for other functions now such as = usage as > I am a Shepherd reviewing a draft for BGP-LS usage for BIER to use = BGP-LS to > gather the elements internals within BIER using the same BGP-LS data = structures > to populate with BIER specific information to graph the BIER topology. = So here > we are not doing any path computations as we are using in this use = case for > NMS type function to gather data for ZTP & Day N provisioning. >=20 > Similarly other use cases such as with TEAS TS-Transport slice and = being able > to provision TS and capturing the TS Enhanced VPN RT & resource = information > and leveraging BGP-LS to do the same data gathering & ZTP like = controller style > provisioning.=20 =20 Is there a fundamental difference between ZTP & Day N provisioning and = path computation for traffic engineering provisioning? It=E2=80=99s all = determining how to configure the network to best carry traffic. =20 > It does seem as though BGP-LS as its a means of "data gathering" "dump = truck" > of anything with the kitchen sink included to build any type of = topological graph > of literally anything under the sun. =20 Remembering Yakov Rekhter saying you could use BGP to transport = Shakespeare.=20 This is a tension with any protocol BGP-LS, PCEP, etc., etc. Stuff gets = added, further use gets made. =20 BGP-LS was intended to export routing information = =E2=80=9Cnorthbound=E2=80=9D from the network. =20 > I see that is a nice to leverage but it does in fact blur the lines of = NMS Netconf/Yang > Controller based functionality and PCE path computation functionality = and SDN > controller based ZTP functionality into a single ubiquitous server = that can do all of > the above and use BGP-LS to accomplish the "kitchen sink" tasks. It = does however > transform BGP to be an NMS tool but a "tool" and not just the original = function > which it was intended NLRI network reachability. =20 Not sure that BGP-LS is BGP. But I agree that BGP-LS is =E2=80=9Can NMS = tool=E2=80=9D. I might argue that BGP distributing policies from installation on PEs is = an NMS protocol. =20 > Am I off base and please let me know as its BGP-LS is being way over = leveraged.=20 > There are pros & cons to everything but I thought I would bring up to = the WG as > an important discussion point. =20 Who are we to argue with real implementations? Assuming that there is a = push for implementation and deployment, then the thing to look for is = =E2=80=9Charm=E2=80=9D. Does this use of BGP-LS cause harm, sow = confusion, risk destabilising the network? Should it use a different = code point to be distinguishable? =20 I think the argument that =E2=80=9Cthere is already another protocol for = doing this=E2=80=9D is worth examining. But we have to be careful that = it doesn=E2=80=99t get us stuck, or force everyone to do something they = don=E2=80=99t want to do. After all, we could carry any protocol message = using Netconf/YANG, but we don=E2=80=99t do =E2=80=9CRSVP-TE over = Netconf=E2=80=9D. =20 Best, Adrian =20 ------=_NextPart_000_00D6_01D6BB47.7EE27210 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable

Hi Gyan,

 

Sorry, I = missed this (got caught on a filter cos it was a bit spammed to a lot of = lists :-).

 

> I have noticed that after reviewing many = drafts across many WGs it seems in the

> industry that the lines seem to be blurred = between a PCE controller, ODL or

> = Openflow SDN Controller and a Netconf/Yang NMS Controller ZTP & Day = X

> provisioning.

 

Yes, = blurriness our speciality.

 

You my find = RFC 7491 useful in this respect, although it is a little dated. And, of = course, RFC 8283 is a good starting point.

 

> As this is a software sitting on a server you can = have a swiss army knife server that

> does everything from PCE path computation = to  Netconf/Yang ZTP & Day N

> provisioning as well as any SDN Controller ODL or = Openflow controller type

> = functions as well.

 

Yes, and = this is one of the risks of PCE as a shiny thing: that it be converted = from a useful toolkit into some form of god-box. I pontificated on this = way back in 2014 at = http://www.olddog.co.uk/PCEPandOnwards.pdf

 

> How this comes into play and realization of the = lines being blurred is the use of

> BGP-LS in building the IGP topological graph of = the network which was designed

> = for PCEP and PCE & PCC active & passive off line path = computation for both

> RSVP-TE or = SR-TE path instantiation.  

 

In some = senses, BGP-LS didn=E2=80=99t add anything because a PCE could have = snooped on the IGP. But BGP-LS provides an export mechanism and = importantly adds to that some policy filters to determine what is = exported thus giving the network some control over what is = exported.

 

FWIW, htt= ps://datatracker.ietf.org/doc/draft-dhodylee-pce-pcep-ls/ proposes = using PCEP for the same function. The argument in favor is that a PCE = has to implement PCEP anyway, so why not include the LS export as well. = The argument against is that BGP-LS has wider applicability and that it = will typically be exported from an ASBR which already supports = BGP.

 

> However now BGP-LS can also be used for other = functions now such as usage as

> I = am a Shepherd reviewing a draft for BGP-LS usage for BIER to use BGP-LS = to

> gather the elements internals = within BIER using the same BGP-LS data structures

> to populate with BIER specific information to = graph the BIER topology.  So here

> we are not doing any path computations as we are = using in this use case  for

> = NMS type function to gather data for ZTP & Day N = provisioning.

> 

> Similarly other use cases such as with TEAS = TS-Transport slice and being able

> to provision TS and capturing the TS Enhanced VPN = RT & resource information

> = and leveraging BGP-LS to do the same data gathering & ZTP like = controller style

> = provisioning. 

 

Is there a = fundamental difference between ZTP & Day N provisioning and path = computation for traffic engineering provisioning? It=E2=80=99s all = determining how to configure the network to best carry = traffic.

 

> It does seem as though BGP-LS as its a means of = "data gathering" "dump truck"

> of anything with the kitchen sink included to = build any type of topological graph

> of literally anything under the = sun.

 

Remembering Yakov Rekhter saying you could use BGP to = transport Shakespeare.

This is a = tension with any protocol BGP-LS, PCEP, etc., etc. Stuff gets added, = further use gets made.

 

BGP-LS was = intended to export routing information =E2=80=9Cnorthbound=E2=80=9D from = the network.

 

> I see that is a nice to leverage but it does = in fact blur the lines of NMS Netconf/Yang

> Controller based functionality and  PCE path = computation functionality and SDN

> controller based ZTP functionality into a single = ubiquitous server that can do all of

> the above and use BGP-LS to accomplish the = "kitchen sink" tasks.  It does however

> transform BGP to be an NMS tool but a = "tool" and not just the original function

> which it was intended NLRI network = reachability.

 

Not sure that BGP-LS is BGP. But I agree that BGP-LS = is =E2=80=9Can NMS tool=E2=80=9D.

I = might argue that BGP distributing policies from installation on PEs is = an NMS protocol.

 

> Am I off base and please let me know as its = BGP-LS is being way over leveraged. 

> There are pros & cons to everything but I = thought I would bring up to the WG as

> an important discussion point.

 

Who are we = to argue with real implementations? Assuming that there is a push for = implementation and deployment, then the thing to look for is = =E2=80=9Charm=E2=80=9D. Does this use of BGP-LS cause harm, sow = confusion, risk destabilising the network? Should it use a different = code point to be distinguishable?

 

I think the = argument that =E2=80=9Cthere is already another protocol for doing = this=E2=80=9D is worth examining. But we have to be careful that it = doesn=E2=80=99t get us stuck, or force everyone to do something they = don=E2=80=99t want to do. After all, we could carry any protocol message = using Netconf/YANG, but we don=E2=80=99t do =E2=80=9CRSVP-TE over = Netconf=E2=80=9D.

 

Best,

Adrian

 

------=_NextPart_000_00D6_01D6BB47.7EE27210-- From nobody Sun Nov 15 05:17:10 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 7E4123A11DD for ; Sun, 15 Nov 2020 05:17:09 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.895 X-Spam-Level: X-Spam-Status: No, score=-1.895 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, MIME_QP_LONG_LINE=0.001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=unavailable autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id u7RfFQ4jAHGA for ; Sun, 15 Nov 2020 05:17:07 -0800 (PST) Received: from mail-m127101.qiye.163.com (mail-m127101.qiye.163.com [115.236.127.101]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 5145E3A11DB for ; Sun, 15 Nov 2020 05:17:05 -0800 (PST) Received: from localhost.localdomain (unknown [106.121.64.254]) by mail-m127101.qiye.163.com (Hmail) with ESMTPA id 5622747B31; Sun, 15 Nov 2020 21:17:02 +0800 (CST) Content-Type: multipart/alternative; boundary=Apple-Mail-7B4941E8-2F56-4945-B8CC-302FB67D7E26 Content-Transfer-Encoding: 7bit From: Aijun Wang Mime-Version: 1.0 (1.0) Date: Sun, 15 Nov 2020 21:17:00 +0800 Message-Id: <00A6FE87-C24F-49A8-9539-3236F489B4B4@tsinghua.org.cn> References: Cc: lsr , "Acee Lindem (acee)" In-Reply-To: To: Robert Raszuk X-Mailer: iPhone Mail (18A373) X-HM-Spam-Status: e1kfGhgUHx5ZQUtXWQgYFAkeWUFZS1VLWVdZKFlBSkxLS0o3V1ktWUFJV1 kPCRoVCBIfWUFZS0xDSBkdQ0hNQklKVkpNS05PT01JSUlOSk9VEwETFhoSFyQUDg9ZV1kWGg8SFR 0UWUFZT0tIVUpKS09ISFVLWQY+ X-HM-Sender-Digest: e1kMHhlZQR0aFwgeV1kSHx4VD1lBWUc6MhQ6Djo5NT8jSgsiTEorAzUv NjlPCwNVSlVKTUtOT09NSUlJQktCVTMWGhIXVQwaFRwaEhEOFTsPCBIVHBMOGlUUCRxVGBVFWVdZ EgtZQVlKS01VSklKVU1PVUlOT1lXWQgBWUFCSEhLNwY+ X-HM-Tid: 0a75cc0d42139865kuuu5622747b31 Archived-At: Subject: Re: [Lsr] Prefix Unreachable Announcement Use Cases X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 15 Nov 2020 13:17:10 -0000 --Apple-Mail-7B4941E8-2F56-4945-B8CC-302FB67D7E26 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Hi, Robert: Aijun Wang China Telecom > On Nov 15, 2020, at 18:49, Robert Raszuk wrote: >=20 > =EF=BB=BF > Hi Aijun, >=20 > As I think what you are proposing overall is useful let me in turn comment= on some of your statements ...=20 >=20 >>> [WAJ] It is common, for example, ISIS level1-2 router will announce the d= efault route to the level 1 area. And, also in the OSPF totally stubby area.= =20 >>>=20 >=20 > Well let's just take OSPF and imagine: >=20 > Area1 --- ABR1 --- Area0 ---ABR2 --- Area2=20 >=20 > So you are saying that unreachable should be always flooded/leaked domain w= ide. That's news - I was always thinking of this functionality only in the c= ase when a summary route covering such more specific is present. Default sho= uld not count ... at least I am not sure if this is safe or makes sense at t= his point.=20 [WAJ] The situation is the same. If there is any special situation that is n= ot safe, we can analyze it together. >=20 >=20 >>> [WAJ] The tunnel soultions described in section 6 is the last resort of t= he path switch procedure. If we deploy the PUA mechanism, normally the route= rs within another area will switch automatically to other ABR when it receiv= es the PUA from one ABR. Only in the critical scenario that described in be= ginning of section 6, the solution described in section 6.1 or 6.2 will be u= sed. >>>=20 >=20 > I think this is where you are starting to confuse people. In my option thi= s solution should have nothing to do with selecting which ABR to use to cros= s area boundary.=20 [WAJ] This situation may occur when both ABR can=E2=80=99t send PUA messages= to divert the traffic and it will apply when the PUA mechanism is not in ef= fect. The last resort for the traffic forwarding. >=20 > The cases when one ABR has full remote reachability and the other one part= ial one in my view are symptoms of a very poorly designed network and to str= etch protocol thin to cover for those mistakes with a patch is not a good th= ing.=20 [WAJ] The situation is not exist from the design or from the beginning. It m= ay appear after some links failure, although it is scarce scenario, we shoul= d consider it for completeness. >=20 > I would actually trim most use cases leaving just one - to signal remote s= ervice node (ex: PE) going down in the presence of summary route being adver= tised from remote area or pop.=20 >=20 [WAJ] Yes, this may be the most useful use case, but the PUA mechanism can a= lso apply to other scenarios. We want to make it one general solution. > Thx, > R. > =20 --Apple-Mail-7B4941E8-2F56-4945-B8CC-302FB67D7E26 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable Hi, Robert:

Aijun W= ang
China Telecom

On Nov 15, 2020, at 18:49, Robert Raszuk <robert@raszuk.net> wrote= :

=EF=BB= =BF
Hi Aijun,

As I think what y= ou are proposing overall is useful let me in turn comment on some of your st= atements ... 

[WAJ] It is common, for examp= le, ISIS level1-2 router will announce the default route to the level 1 area= . And, also in the OSPF totally stubby area. 


Well let= 's just take OSPF and imagine:

 Area1 --- ABR1= --- Area0 ---ABR2 --- Area2 

So you are sayin= g that unreachable should be always flooded/leaked domain wide. That's news -= I was always thinking of this functionality only in the case when a summary= route covering such more specific is present. Default should not count= ... at least I am not sure if this is safe or makes sense at this point.&nb= sp;
[WAJ] The situation is the same. If t= here is any special situation that is not safe, we can analyze it together.<= br>


[WAJ] The tunnel soultions described in se= ction 6 is the last resort of the path switch procedure. If we deploy the PU= A mechanism, normally the routers within another area will switch automatica= lly to other ABR when it receives the PUA from one ABR.  Only in the cr= itical scenario that described in beginning of section 6, the solution descr= ibed in section 6.1 or 6.2 will be used.

=

I think this is wh= ere you are starting to confuse people. In my option this solution should ha= ve nothing to do with selecting which ABR to use to cross area boundary.&nbs= p;
[WAJ] This situation may occur when b= oth ABR can=E2=80=99t send PUA messages to divert the traffic and it will ap= ply when the PUA mechanism is not in effect. The last resort for the traffic= forwarding.
=

The cases when one ABR has fu= ll remote reachability and the other one partial one in my view are symptoms= of a very poorly designed network and to stretch protocol thin to cove= r for those mistakes with a patch is not a good thing. 
[WAJ] The situation is not exist from the design o= r from the beginning. It may appear after some links failure, although it is= scarce scenario, we should consider it for completeness.


I would actually trim most use cases leaving just one -= to signal remote service node (ex: PE) going down in the presence of summar= y route being advertised from remote area or pop. 

=
[WAJ] Yes, this may be the most useful use ca= se, but the PUA mechanism can also apply to other scenarios. We want to make= it one general solution.

Thx,
R.
 = ;
= --Apple-Mail-7B4941E8-2F56-4945-B8CC-302FB67D7E26-- From nobody Sun Nov 15 05:26:42 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 607723A11F6; Sun, 15 Nov 2020 05:26:37 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.896 X-Spam-Level: X-Spam-Status: No, score=-1.896 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id mLEy9l7Y7QfV; Sun, 15 Nov 2020 05:26:33 -0800 (PST) Received: from frasgout.his.huawei.com (frasgout.his.huawei.com [185.176.79.56]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate 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Message-ID: To: Aijun Wang Cc: lsr , "Acee Lindem (acee)" Content-Type: multipart/alternative; boundary="000000000000d5503e05b427f819" Archived-At: Subject: Re: [Lsr] Prefix Unreachable Announcement Use Cases X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 15 Nov 2020 16:44:19 -0000 --000000000000d5503e05b427f819 Content-Type: text/plain; charset="UTF-8" Hi Aijun, I would in fact only propose that the presented mechanism is narrowed down to invalidate BGP (service) routes - in fact their next hops. The reason being that the moment you make the solution generic, moreover the moment you want it to be used in RIB and data plane I am afraid you are running into similar (even if local) deaggregation mechanism like recently described in RIFT. That would kill all the scalability of advertising summary routes in the first place and I bet would face lots of opposition. Thx, R. > I would actually trim most use cases leaving just one - to signal remote > service node (ex: PE) going down in the presence of summary route being > advertised from remote area or pop. > > [WAJ] Yes, this may be the most useful use case, but the PUA mechanism can also apply to other scenarios. We want to make it one general solution. --000000000000d5503e05b427f819 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Aijun,

I would in fact only propose that the presented mechanism is narro= wed down to invalidate BGP (service) routes - in fact=C2=A0their next hops.= =C2=A0

The reason being that the moment you make t= he solution generic, moreover the moment you want it to be used in RIB and = data plane I am afraid you are running into similar=C2=A0(even if local) de= aggregation mechanism like recently described in RIFT. That would kill all = the scalability of advertising summary routes in the first place and I bet = would face lots of opposition.=C2=A0

Thx,
R.
=C2=A0
I would actually trim most use cas= es leaving just one - to signal remote service node (ex: PE) going down in = the presence of summary route being advertised from remote area or pop.=C2= =A0
=C2=A0[= WAJ] Yes, this may be the most useful use case, but the PUA mechanism can a= lso apply to other scenarios. We want to make it one general solution.
--000000000000d5503e05b427f819-- From nobody Sun Nov 15 08:57:35 2020 Return-Path: X-Original-To: lsr@ietf.org Delivered-To: lsr@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 1FAD83A099E; Sun, 15 Nov 2020 08:57:33 -0800 (PST) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: Cc: lsr@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 7.22.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: lsr@ietf.org Message-ID: <160545945309.18475.5714660733899481579@ietfa.amsl.com> Date: Sun, 15 Nov 2020 08:57:33 -0800 Archived-At: Subject: [Lsr] I-D Action: draft-ietf-lsr-isis-rfc5316bis-00.txt X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 15 Nov 2020 16:57:33 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Link State Routing WG of the IETF. Title : ISIS Extensions in Support of Inter-Autonomous System (AS) MPLS and GMPLS Traffic Engineering Authors : Mach(Guoyi) Chen Les Ginsberg Stefano Previdi Xiaodong Duan Filename : draft-ietf-lsr-isis-rfc5316bis-00.txt Pages : 20 Date : 2020-11-15 Abstract: This document describes extensions to the Intermediate System to Intermediate System (IS-IS) protocol to support Multiprotocol Label Switching (MPLS) and Generalized MPLS (GMPLS) Traffic Engineering (TE) for multiple Autonomous Systems (ASs). It defines IS-IS extensions for the flooding of TE information about inter-AS links, which can be used to perform inter-AS TE path computation. No support for flooding information from within one AS to another AS is proposed or defined in this document. This document obsoletes RFC 5316. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-rfc5316bis/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-lsr-isis-rfc5316bis-00 https://datatracker.ietf.org/doc/html/draft-ietf-lsr-isis-rfc5316bis-00 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ From nobody Sun Nov 15 11:29:25 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id F15ED3A0656 for ; Sun, 15 Nov 2020 11:29:22 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.096 X-Spam-Level: X-Spam-Status: No, score=-2.096 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, MIME_QP_LONG_LINE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=unavailable autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id f0YCdLNBqHop for ; Sun, 15 Nov 2020 11:29:21 -0800 (PST) Received: from mail-pg1-x52c.google.com (mail-pg1-x52c.google.com [IPv6:2607:f8b0:4864:20::52c]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 7E8453A0659 for ; Sun, 15 Nov 2020 11:29:21 -0800 (PST) Received: by mail-pg1-x52c.google.com with SMTP id h16so6697601pgb.7 for ; Sun, 15 Nov 2020 11:29:21 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=content-transfer-encoding:from:mime-version:subject:date:message-id :references:cc:in-reply-to:to; bh=726YgiRuTVOaPyqtm5IUZv7NbYUYrDGAl12PGLaPe8o=; b=HqOq2X+FXeQz7Aaz5bh5MOEKQq/xpShvgPfpSa8vVvIpJ+FcSm8i9r/mV1JDyDF+Fs QGmQtMK8gClfARCVEEEK0fa++zC2BGNEL+M/JMpjc5bv9BcwCxDISeHGTiiuJxOxbkBJ Whj8O/XJ+snz+njEJXBxCrgFogEh9G+kFIyBQ4TpqmoSmW3OE+FufctECtJ3NPsjk8+U YX4Ta6h57MZm+BRCWI8of2NL2X/deOLQ4KJV7vmHZRACiWdkLPJPsX8FbtAE1B03UPFU 7fL6jKfRW9DzpdkYHHyBhFU6+w2aWjjmtc2ABwn41udOMp3ujbWHJ7/FgnxwKY9iuLl7 cUmA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:content-transfer-encoding:from:mime-version :subject:date:message-id:references:cc:in-reply-to:to; bh=726YgiRuTVOaPyqtm5IUZv7NbYUYrDGAl12PGLaPe8o=; b=iUpqMuZ2miGIpJh7vq1fOmJHfw3iitD6ILhCDZodRhjbQ1tvfeaZRzooRqKCh5ocoV +kBx9voHK0tkTuksF2gXfiWB3mpyyrBW4p2oeA5VExE0nTApD9r7vb3w0/3dAVdJ+wGC nWC620RdZBarkLF+eUv4/o2C4hApDYDasVHtP9vivvf5p7Ib4cY2om7wbGOuAonquGrX NxIx0LbtYDhgb8RQjblQ/cSLcxiH+FH6bEfHdFc5iT/JW37doq/pgOjj+hRrNQcrGGxD fbdHVYZLNuJpvFFCFdq5LrhLV2viKsPe73QdAMJPnfwamVHkbCByrtro13q2J/5Xlstg 5tSA== X-Gm-Message-State: AOAM531ToyftscCYdTHHCRnl25fp3oNlI7DOIUHfaX6UQqGns8zemgcX d3kqBlyR9z50DLLWp5jXhlDQ5KzPEOg= X-Google-Smtp-Source: ABdhPJzc4NDHenkczXgnEpXTYNk+IOCu8e5VXXE8KGhxveD6hIsy6bGVEgy/BOkAbjD59mnL+TAISQ== X-Received: by 2002:a17:90a:7301:: with SMTP id m1mr12002123pjk.128.1605468560835; Sun, 15 Nov 2020 11:29:20 -0800 (PST) Received: from [192.168.1.12] (c-73-63-232-212.hsd1.ca.comcast.net. [73.63.232.212]) by smtp.gmail.com with ESMTPSA id a81sm16012425pfd.178.2020.11.15.11.29.19 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 15 Nov 2020 11:29:19 -0800 (PST) Content-Type: multipart/alternative; boundary=Apple-Mail-59B547B2-349F-4CDC-B74C-38AFD32F6A0C Content-Transfer-Encoding: 7bit From: Jeff Tantsura Mime-Version: 1.0 (1.0) Date: Sun, 15 Nov 2020 11:29:18 -0800 Message-Id: References: Cc: Aijun Wang , lsr , "Acee Lindem (acee)" In-Reply-To: To: Robert Raszuk X-Mailer: iPhone Mail (18B92) Archived-At: Subject: Re: [Lsr] Prefix Unreachable Announcement Use Cases X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 15 Nov 2020 19:29:23 -0000 --Apple-Mail-59B547B2-349F-4CDC-B74C-38AFD32F6A0C Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable As RIFT chair - I=E2=80=99d like to respond to Robert=E2=80=99 comment - th= e example is rather unfortunate, in RIFT disaggregation is conditional and w= ell contained within its context, it doesn=E2=80=99t affect overall scalabi= lity. Regards, Jeff > On Nov 15, 2020, at 08:44, Robert Raszuk wrote: >=20 > =EF=BB=BF > Hi Aijun, >=20 > I would in fact only propose that the presented mechanism is narrowed down= to invalidate BGP (service) routes - in fact their next hops.=20 >=20 > The reason being that the moment you make the solution generic, moreover t= he moment you want it to be used in RIB and data plane I am afraid you are r= unning into similar (even if local) deaggregation mechanism like recently de= scribed in RIFT. That would kill all the scalability of advertising summary r= outes in the first place and I bet would face lots of opposition.=20 >=20 > Thx, > R. > =20 >>> I would actually trim most use cases leaving just one - to signal remote= service node (ex: PE) going down in the presence of summary route being adv= ertised from remote area or pop.=20 > [WAJ] Yes, this may be the most useful use case, but the PUA mechanism ca= n also apply to other scenarios. We want to make it one general solution. > _______________________________________________ > Lsr mailing list > Lsr@ietf.org > https://www.ietf.org/mailman/listinfo/lsr --Apple-Mail-59B547B2-349F-4CDC-B74C-38AFD32F6A0C Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable As RIFT chair - I=E2=80=99d like to respond= to Robert=E2=80=99 comment -  the example is rather  unfortunate,= in RIFT disaggregation is conditional and well contained within its context= , it doesn=E2=80=99t  affect overall scalability.

Regards,
Jeff

On Nov 15, 2020, at 08:44, Robert Raszuk <robert@raszuk.net> wrote:=

=EF=BB= =BF
Hi Aijun,

=
I would in fact only propose that the presented mechanism is narr= owed down to invalidate BGP (service) routes - in fact their next hops.=  

The reason being that the moment you make th= e solution generic, moreover the moment you want it to be used in RIB and da= ta plane I am afraid you are running into similar (even if local) deagg= regation mechanism like recently described in RIFT. That would kill all the s= calability of advertising summary routes in the first place and I bet would f= ace lots of opposition. 

Thx,
R.
 
I would actually trim most use cases leaving j= ust one - to signal remote service node (ex: PE) going down in the presence o= f summary route being advertised from remote area or pop. 
 [WAJ] Yes, this ma= y be the most useful use case, but the PUA mechanism can also apply to other= scenarios. We want to make it one general solution.
_______________________________________________
Lsr ma= iling list
Lsr@ietf.org
https://www.ietf.org= /mailman/listinfo/lsr
= --Apple-Mail-59B547B2-349F-4CDC-B74C-38AFD32F6A0C-- From nobody Sun Nov 15 12:01:47 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 875523A0A47 for ; Sun, 15 Nov 2020 12:01:44 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.087 X-Spam-Level: X-Spam-Status: No, score=-2.087 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_REMOTE_IMAGE=0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id WEF4si5V6gji for ; Sun, 15 Nov 2020 12:01:42 -0800 (PST) Received: from mail-pf1-x42e.google.com (mail-pf1-x42e.google.com [IPv6:2607:f8b0:4864:20::42e]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 2C81B3A0E95 for ; Sun, 15 Nov 2020 12:01:25 -0800 (PST) Received: by mail-pf1-x42e.google.com with SMTP id 131so849506pfb.9 for ; Sun, 15 Nov 2020 12:01:25 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=8tgbA2P1U2R4JvvkE/OM6wHQJWzVklXW96JZ38CXy7s=; b=bwGDagmcMzGjKnEQBpVvWdGlrRjAfn+hKVztbE/gINH1gnLqe9yNY9XgBEAokHRLms xbwlcWENqgqn8qWUgQojak+baa4mjgRLcfppl5xmRPu+GOMtpaGmn8O25WUxjC7oZ23u G0wT+zOBg8AqUkUj0CfiWll0bnTphEIBiVSC+sZz9F7wf5o5y8PZetzY5yohHiXY2GEw tWcNJCo/c7bqrCndbYXQvuWpFi1x2czJH6prTSs+0U7RNIn+qBIhU/NouPquDVfnUvzE F5XO7jT7a/R+Q+XZgqAktclAKb4lj2PDAQTeEcqNwThgaZokD1Uk1p19SYCqhynhZvE5 GMIA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=8tgbA2P1U2R4JvvkE/OM6wHQJWzVklXW96JZ38CXy7s=; b=K6tDxZELK0t4QEpMhotMecPpX3D5LD3DBSfqvG5UaWbpiEeEeHutcXzM0C0QJeDnXn Vj5QsdiM0xSJSs4UIq2johSUgTWLDKrF2pod3fXQ3DtXwXR0j8m5Cnv41Mhp5N0XgLTv pDq7hcOoQt1SusLGAZwsC2zO++hqjKX/sa9BTjyRFH5eq8upXf1lzfJUGYGcrIJvzHio IJirwefOOTDdMb3vJ2n27ToKU3UcTawdvpK7di85jjPIJu3/cY9irUv8Czv0ZQIlf4L9 GTWoz97aQ1T9tyZaMWNgUVqEHz3z9ZnB7X5mzFkopKvVgD8NGWf76sRZy6ZHdZolUxvO 2A/Q== X-Gm-Message-State: AOAM532JXi/xo5GJTqK5o2jdK3akOwwFM0V4G7x2xY8eeRzM+hcNfV8U fcUcwE3RVXG83GzTIKznl4GRXY1Ix1ItIVbiXX4ioHEtuaIYMg== X-Google-Smtp-Source: ABdhPJzBWr5GQr9Ji1sP/o7ViPTgIh4inoWoy4NNRZnpCiGsDd9Qsk3iTYRzEcR8A6N1N1/3hRgeYuv16abGEyUUcMU= X-Received: by 2002:a17:90b:1490:: with SMTP id js16mr6066772pjb.215.1605470484479; Sun, 15 Nov 2020 12:01:24 -0800 (PST) MIME-Version: 1.0 References: <00A6FE87-C24F-49A8-9539-3236F489B4B4@tsinghua.org.cn> In-Reply-To: From: Gyan Mishra Date: Sun, 15 Nov 2020 15:01:13 -0500 Message-ID: To: Robert Raszuk Cc: "Acee Lindem (acee)" , Aijun Wang , lsr Content-Type: multipart/alternative; boundary="000000000000ecc1a105b42ab942" Archived-At: Subject: Re: [Lsr] Prefix Unreachable Announcement Use Cases X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 15 Nov 2020 20:01:46 -0000 --000000000000ecc1a105b42ab942 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Robert & Acee I have been working with Aijun to help clean up the verbiage in the draft which after IETF 109 will plan to do an update based on feedback. I will be presenting this draft as well as the passive interface draft tomorrow morning. It has been challenging trying to graphically depict Aijun=E2=80=99s goals = and intentions but I have tried my best to do so in the presentation tomorrow morning. Kind Regards Gyan On Sun, Nov 15, 2020 at 11:44 AM Robert Raszuk wrote: > Hi Aijun, > > I would in fact only propose that the presented mechanism is narrowed dow= n > to invalidate BGP (service) routes - in fact their next hops. > > The reason being that the moment you make the solution generic, moreover > the moment you want it to be used in RIB and data plane I am afraid you a= re > running into similar (even if local) deaggregation mechanism like recentl= y > described in RIFT. That would kill all the scalability of advertising > summary routes in the first place and I bet would face lots of opposition= . > > Thx, > R. > > >> I would actually trim most use cases leaving just one - to signal remote >> service node (ex: PE) going down in the presence of summary route being >> advertised from remote area or pop. >> >> [WAJ] Yes, this may be the most useful use case, but the PUA mechanism > can also apply to other scenarios. We want to make it one general solutio= n. > _______________________________________________ > Lsr mailing list > Lsr@ietf.org > https://www.ietf.org/mailman/listinfo/lsr > --=20 *Gyan Mishra* *Network Solutions A**rchitect * *M 301 502-134713101 Columbia Pike *Silver Spring, MD --000000000000ecc1a105b42ab942 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

Robert & Acee=C2=A0

I have been working with Aijun to help cle= an up the verbiage in the draft which after IETF 109 will plan to do an upd= ate based on feedback.

I will be presenting this draft as well as the passive interface draft t= omorrow morning. =C2=A0

= It has been challenging trying to graphically depict Aijun=E2=80=99s goals = and intentions but I have tried my best to do so in the presentation tomorr= ow morning.

Kind Regards= =C2=A0

Gyan=C2=A0
<= div>
On= Sun, Nov 15, 2020 at 11:44 AM Robert Raszuk <robert@raszuk.net> wrote:
Hi Aijun,

I would in fact only propose that the presented mechanism= is narrowed down to invalidate BGP (service) routes - in fact=C2=A0their n= ext hops.=C2=A0

The reason being that the moment y= ou make the solution generic, moreover the moment you want it to be used in= RIB and data plane I am afraid you are running into similar=C2=A0(even if = local) deaggregation mechanism like recently described in RIFT. That would = kill all the scalability of advertising summary routes in the first place a= nd I bet would face lots of opposition.=C2=A0

Thx,=
R.
=
=C2=A0
<= div class=3D"gmail_quote">
I would actually trim most use cases leaving= just one - to signal remote service node (ex: PE) going down in the presen= ce of summary route being advertised from remote area or pop.=C2=A0
=C2=A0[WAJ] Yes, t= his may be the most useful use case, but the PUA mechanism can also apply t= o other scenarios. We want to make it one general solution.
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--000000000000ecc1a105b42ab942-- From nobody Sun Nov 15 12:03:52 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 46A443A09C1 for ; Sun, 15 Nov 2020 12:03:50 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.098 X-Spam-Level: X-Spam-Status: No, score=-2.098 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=raszuk.net Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id UkyuEc0R3H7X for ; Sun, 15 Nov 2020 12:03:48 -0800 (PST) Received: from mail-lf1-x12c.google.com (mail-lf1-x12c.google.com [IPv6:2a00:1450:4864:20::12c]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 411853A099E for ; Sun, 15 Nov 2020 12:03:48 -0800 (PST) Received: by mail-lf1-x12c.google.com with SMTP id w142so22021767lff.8 for ; Sun, 15 Nov 2020 12:03:48 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=raszuk.net; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=fk7GrjU5SbLsW5g9DlMxhmDf3r5H3MiY/Hf0+OD+phs=; b=SWnFrf9bBPGoFxWbKJyt4ldq3tNw/hAcBakqTm+OPG9lvshmBZ376dwKNulrMe/+mj wBtWEApeOxDK+CLWZHmRItJj1quZ1g48AZk5EtcUrFGVJr2dpQPp4ltoVrIlKaXNaUVl rvJ0VQHOb/SwQYikJvIJXVLImo4f/f44rqgF8R/lZKJ0+3reuNtpXiU5bymh/YN8Hxpr vOYLy/8ruxYe16z/QMUvvYEAuVDXS3W+zpmyzrCo1l+wYBEq/o9fZ7mwbcwlP6bQ1rUO cHR5sLYv3esb5F2ynjQcWBdu8miZdWi0+WGQqDJ67BdPjfmsRJPv3+dIQ+arfHyXlt43 JL7Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=fk7GrjU5SbLsW5g9DlMxhmDf3r5H3MiY/Hf0+OD+phs=; b=aZx7SlY6lOxYZ29WylLd3HXphgYnayP/1NoUTKI/SikZFtVmn9h4eqzEDmB7XMMa1A n+rXHmkDVFD5w6Lf5QuhDA+TgIInkz5Z4kbhq1LL4ozuXLQyCiIzuk1y1R8s5CS5L9Ws bjNVyQrBjElJM085UbZDdyWgdjNu3zD6bijLZAjWjfu7XGTY7VjKL3w1uqj7Uv2EIEOY LibTXJAnIVIZohBJbNpgpdVR6FHKNAkD8pltc2qTd22Xp+I5V5jZnonRINzIabhAsbdy dLFrzOAtAfhPNug2ONh0C1o5CQE0q+ihd+YwlnsZVTWzSH2QDucgKZBdhhjDQT4KEktG Wg/w== X-Gm-Message-State: AOAM531m3N+Ay9GhWIDCAyISh8cEczYYcF09viPuyOrzovCWvCn5pPEn o0yrWM2M6RxQVyuldzey6OSnkEO+ootWexUtjRFRlg== X-Google-Smtp-Source: ABdhPJyVjbMqjU7aDlIEjyI0tsSQBCK5zywlizJ/1UARIhmEJzACySiTInvuIZ0s6wlrkkifY7BGDUT9ZFi2lx0ALC0= X-Received: by 2002:a05:6512:285:: with SMTP id j5mr2278315lfp.269.1605470626131; Sun, 15 Nov 2020 12:03:46 -0800 (PST) MIME-Version: 1.0 References: In-Reply-To: From: Robert Raszuk Date: Sun, 15 Nov 2020 21:03:36 +0100 Message-ID: To: Jeff Tantsura Cc: Aijun Wang , lsr , "Acee Lindem (acee)" Content-Type: multipart/alternative; boundary="0000000000005e4a1f05b42ac2fb" Archived-At: Subject: Re: [Lsr] Prefix Unreachable Announcement Use Cases X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 15 Nov 2020 20:03:50 -0000 --0000000000005e4a1f05b42ac2fb Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Jeff, I was not bringing RIFT's negative routies example as something inherently negative. I was just pointing it out to illustrate that today's data plane lookup does not really support "if does not match" checks. So if you intend to use unreachable prefixes in data plane as result you need to break summary into as atomic prefixes as your unreachable advertisement mask. Hence my recommendation to use IGP to flood unreachable only for the purpose of control plane (namely BGP paths invalidation). Cheers, R. On Sun, Nov 15, 2020 at 8:29 PM Jeff Tantsura wrote: > As RIFT chair - I=E2=80=99d like to respond to Robert=E2=80=99 comment - = the example is > rather unfortunate, in RIFT disaggregation is conditional and well > contained within its context, it doesn=E2=80=99t affect overall scalabil= ity. > > Regards, > Jeff > > On Nov 15, 2020, at 08:44, Robert Raszuk wrote: > > =EF=BB=BF > Hi Aijun, > > I would in fact only propose that the presented mechanism is narrowed dow= n > to invalidate BGP (service) routes - in fact their next hops. > > The reason being that the moment you make the solution generic, moreover > the moment you want it to be used in RIB and data plane I am afraid you a= re > running into similar (even if local) deaggregation mechanism like recentl= y > described in RIFT. That would kill all the scalability of advertising > summary routes in the first place and I bet would face lots of opposition= . > > Thx, > R. > > >> I would actually trim most use cases leaving just one - to signal remote >> service node (ex: PE) going down in the presence of summary route being >> advertised from remote area or pop. >> >> [WAJ] Yes, this may be the most useful use case, but the PUA mechanism > can also apply to other scenarios. We want to make it one general solutio= n. > _______________________________________________ > Lsr mailing list > Lsr@ietf.org > https://www.ietf.org/mailman/listinfo/lsr > > --0000000000005e4a1f05b42ac2fb Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Jeff,=C2=A0

I was not bringing RIFT'= ;s negative routies example as something inherently negative. I was just po= inting it out to illustrate that today's data plane lookup does not rea= lly support "if does not match" checks.=C2=A0

So if you intend to use unreachable prefixes in data plane as=C2=A0re= sult you need to break summary into as atomic prefixes as your unreachable = advertisement mask.=C2=A0

Hence my recommendation = to use IGP to flood unreachable only for the purpose of control plane (name= ly BGP paths invalidation).=C2=A0

Cheers,
R.

On Sun, Nov 15, 2020 at 8:29 PM Jeff Tantsura <jefftant.ietf@gmail.com> wrote:
As RIF= T chair - I=E2=80=99d like to respond to Robert=E2=80=99 comment - =C2=A0th= e example is rather =C2=A0unfortunate, in RIFT disaggregation is conditiona= l and well contained within its context, it doesn=E2=80=99t =C2=A0affect ov= erall scalability.

Regards,
Jeff

On Nov 15, 2020, at 08:44, Robe= rt Raszuk <robert= @raszuk.net> wrote:

=EF=BB=BF
<= div>Hi Aijun,

I would in fact only propose that th= e presented mechanism is narrowed down to invalidate BGP (service) routes -= in fact=C2=A0their next hops.=C2=A0

The reason be= ing that the moment you make the solution generic, moreover the moment you = want it to be used in RIB and data plane I am afraid you are running into s= imilar=C2=A0(even if local) deaggregation mechanism like recently described= in RIFT. That would kill all the scalability of advertising summary routes= in the first place and I bet would face lots of opposition.=C2=A0

Thx,
R.
=C2=A0
I wo= uld actually trim most use cases leaving just one - to signal remote servic= e node (ex: PE) going down in the presence of summary route being advertise= d from remote area or pop.=C2=A0
=C2=A0[WAJ] Yes, this may be the most useful use case= , but the PUA mechanism can also apply to other scenarios. We want to make = it one general solution.
_______________________________________________
Lsr m= ailing list
Lsr@ietf.org
https://www.ietf.org/mailman/listinfo/lsr<= /a>
--0000000000005e4a1f05b42ac2fb-- From nobody Sun Nov 15 12:20:25 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 7F5CD3A0D74 for ; Sun, 15 Nov 2020 12:20:23 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.097 X-Spam-Level: X-Spam-Status: No, score=-2.097 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=unavailable autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id uzbfHDOYnxN7 for ; Sun, 15 Nov 2020 12:20:21 -0800 (PST) Received: from mail-pg1-x534.google.com (mail-pg1-x534.google.com [IPv6:2607:f8b0:4864:20::534]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 7FC653A0C97 for ; Sun, 15 Nov 2020 12:20:08 -0800 (PST) Received: by mail-pg1-x534.google.com with SMTP id m9so1232204pgb.4 for ; Sun, 15 Nov 2020 12:20:08 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:to:cc:message-id:in-reply-to:references:subject :mime-version; bh=d5zBsnMrxOvUFrlhh8lnQYuoBLE7/liQYyFXV1F92dQ=; b=TDLcqceX0j2KGjr19Fhnga7nO9O0C1zyWmEfi2HqE6eCl7wwJby7oH/ekg5S93LoGc jQuyr5UEnWyKNO5IhkxbaQHowN94k7KkLeX9VKPhpg4aG5k3nWBVRDzrusQELutnCpFu jEl2knlsCcAKSNQD1uKxQiU3rP4Fwmn1Ybp2QFXN0OVGXa2Xf0xxYVH83bKrOdINJdxh nTQDO2osgWp5sHz0UmgcKd5gWW5oHyxan9IljrnIjpqVOoAieb9VhHY/YKoRZeejfFKT EDrhhW4JEc7akkJfbIvCsQwXyNsEPLYho0rT9qtnqW4ETKz7DjvE2cd6vbzwkWz0jjkf bQ6A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:message-id:in-reply-to :references:subject:mime-version; bh=d5zBsnMrxOvUFrlhh8lnQYuoBLE7/liQYyFXV1F92dQ=; b=BILhOTgrFD0AkirJoIJB605LH7sqCI76mwvwKl1uhgg5s7owXgpk/rgaAcfFR83EBI i+vFkI0p5cOS6dGKNL5lzx8k5dhgbcr4I1QsTk9TRvYSLdrGkniKF43ui/KO54vNzWHu PFdhtBI3SD4GuuKhK8Q7Aq2DccxxqVxw3ZIj0/nqRO8a5pUgpky/b1PS3WjLO3lWXvl+ apn6gh17XRRBxDyuEnKJt6OB7vHl0zRkmNH8vGWjFYrXCpnEzXMtOAycvpLOeyut02RO Fv2inQ8RRfnQjJftp1MAY2+xqXTA0KDWiOHyOWqJJ2EfHF0H+ghJ8+3BxyQMEJTT3RTF 5wXA== X-Gm-Message-State: AOAM531HKZCTz+QXSpgOONZJGlrTOtBlflSYPnFuuCFHzqIZYJzpKvT6 PnTaXfi0ryQgjKf4Z4FKOxU= X-Google-Smtp-Source: ABdhPJzxOaUxmpvA7jgczIJdU00FK/z6nBvtDIgIQypxH3y4Nt9Fv/u8ZTciGVb0vXImA1oL7nkGyw== X-Received: by 2002:a17:90b:2204:: with SMTP id kw4mr12654246pjb.153.1605471608026; Sun, 15 Nov 2020 12:20:08 -0800 (PST) Received: from [192.168.1.7] (c-73-63-232-212.hsd1.ca.comcast.net. [73.63.232.212]) by smtp.gmail.com with ESMTPSA id k5sm15768195pjj.37.2020.11.15.12.20.06 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Sun, 15 Nov 2020 12:20:07 -0800 (PST) Date: Sun, 15 Nov 2020 12:19:58 -0800 From: Jeff Tantsura To: Robert Raszuk Cc: Aijun Wang , lsr , "Acee Lindem (acee)" Message-ID: <9a4b6fb8-a650-401a-bae6-647162173f8b@Spark> In-Reply-To: References: X-Readdle-Message-ID: 9a4b6fb8-a650-401a-bae6-647162173f8b@Spark MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="5fb18d73_436c6125_ba5e" Archived-At: Subject: Re: [Lsr] Prefix Unreachable Announcement Use Cases X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 15 Nov 2020 20:20:24 -0000 --5fb18d73_436c6125_ba5e Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Content-Disposition: inline Thanks for clarification Robert, makes sense. Cheers, Jeff On Nov 15, 2020, 12:03 PM -0800, Robert Raszuk , wro= te: > Jeff, > > I was not bringing RI=46T's negative routies example as something inher= ently negative. I was just pointing it out to illustrate that today's dat= a plane lookup does not really support =22if does not match=22 checks. > > So if you intend to use unreachable prefixes in data plane as=C2=A0resu= lt you need to break summary into as atomic prefixes as your unreachable = advertisement mask. > > Hence my recommendation to use IGP to flood unreachable only for the pu= rpose of control plane (namely BGP paths invalidation). > > Cheers, > R. > > > On Sun, Nov 15, 2020 at 8:29 PM Jeff Tantsura wrote: > > > As RI=46T chair - I=E2=80=99d like to respond to Robert=E2=80=99 co= mment - =C2=A0the example is rather =C2=A0unfortunate, in RI=46T disaggre= gation is conditional and well contained within its context, it doesn=E2=80= =99t =C2=A0affect overall scalability. > > > > > > Regards, > > > Jeff > > > > > > > On Nov 15, 2020, at 08:44, Robert Raszuk wr= ote: > > > > > > > > > Hi Aijun, > > > > > > > > > > I would in fact only propose that the presented mechanism is na= rrowed down to invalidate BGP (service) routes - in fact=C2=A0their next = hops. > > > > > > > > > > The reason being that the moment you make the solution generic,= moreover the moment you want it to be used in RIB and data plane I am af= raid you are running into similar=C2=A0(even if local) deaggregation mech= anism like recently described in RI=46T. That would kill all the scalabil= ity of advertising summary routes in the first place and I bet would face= lots of opposition. > > > > > > > > > > Thx, > > > > > R. > > > > > > > > > > > > > I would actually trim most use cases leaving just one - t= o signal remote service node (ex: PE) going down in the presence of summa= ry route being advertised from remote area or pop. > > > > > =C2=A0=5BWAJ=5D Yes, this may be the most useful use case, but = the PUA mechanism can also apply to other scenarios. We want to make it o= ne general solution. > > > > =5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F= =5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F= > > > > Lsr mailing list > > > > Lsr=40ietf.org > > > > https://www.ietf.org/mailman/listinfo/lsr --5fb18d73_436c6125_ba5e Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable Content-Disposition: inline
Thanks for clarification Robert, makes sense.&=2316= 0;

Cheers,
Jeff
On Nov 15, 2020, 12:03 PM -0800, Ro= bert Raszuk <robert=40raszuk.net>, wrote:
Jeff,&=23160;

I was not bringing RI=46T's negative routies example as something in= herently negative. I was just pointing it out to illustrate that today's = data plane lookup does not really support =22if does not match=22 checks.= &=23160;

So if you intend to use unreachable prefixes in data plane as&=23160= ;result you need to break summary into as atomic prefixes as your unreach= able advertisement mask.&=23160;

Hence my recommendation to use IGP to flood unreachable only for the= purpose of control plane (namely BGP paths invalidation).&=23160;

Cheers,
R.

On Sun, Nov 15, 2020 at 8= :29 PM Jeff Tantsura <jefftant.ietf=40gmail.com> wrote:
As RI=46T chair - I=E2=80=99d like to respond to Ro= bert=E2=80=99 comment - &=23160;the example is rather &=23160;unfortunate= , in RI=46T disaggregation is conditional and well contained within its c= ontext, it doesn=E2=80=99t &=23160;affect overall scalability.

Regards,
Jeff

On Nov 15, 2020, at 08:44, Robert Raszuk &l= t;robe= rt=40raszuk.net> wrote:

=EF=BB=BF
Hi Aijun,

I would in fact only propose that the presented mechanism is narrowe= d down to invalidate BGP (service) routes - in fact&=23160;their next hop= s.&=23160;

The reason being that the moment you make the solution generic, more= over the moment you want it to be used in RIB and data plane I am afraid = you are running into similar&=23160;(even if local) deaggregation mechani= sm like recently described in RI=46T. That would kill all the scalability= of advertising summary routes in the first place and I bet would face lo= ts of opposition.&=23160;

Thx,
R.
&=23160;
I would actually trim most use cases leaving just one - to signal re= mote service node (ex: PE) going down in the presence of summary route be= ing advertised from remote area or pop.&=23160;
&=23160;=5BWAJ=5D Yes, this may be the most useful use case, but the= PUA mechanism can also apply to other scenarios. We want to make it one = general solution.
=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F= =5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F<= /span>
Lsr mailing list
Lsr=40= ietf.org
https://www.ietf.org/mailman/listinfo/lsr
=
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charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 X-OriginatorOrg: juniper.net X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: DM6PR05MB6348.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 6745d1e0-c967-4e56-ac5c-08d889c1ffca X-MS-Exchange-CrossTenant-originalarrivaltime: 15 Nov 2020 23:55:58.5371 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: bea78b3c-4cdb-4130-854a-1d193232e5f4 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: JqCn7jzj29Umvzs4hiWzuYPiRS6nMSucgGKR6hoYIXNxPKoN6kjS/TH8VAveuzVzycWBrg1fjG4hmrP8yZ4AKQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS7PR05MB7366 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.312, 18.0.737 definitions=2020-11-15_11:2020-11-13, 2020-11-15 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_spam_notspam policy=outbound_spam score=0 clxscore=1015 mlxscore=0 phishscore=0 priorityscore=1501 lowpriorityscore=0 suspectscore=0 bulkscore=0 spamscore=0 mlxlogscore=999 malwarescore=0 adultscore=0 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2011150155 Archived-At: Subject: [Lsr] FW: New Version Notification for draft-bonica-lsr-ip-flexalgo-01.txt X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 15 Nov 2020 23:56:07 -0000 DQpGWUkNCg0KDQpKdW5pcGVyIEJ1c2luZXNzIFVzZSBPbmx5DQoNCj4gLS0tLS1PcmlnaW5hbCBN ZXNzYWdlLS0tLS0NCj4gRnJvbTogaW50ZXJuZXQtZHJhZnRzQGlldGYub3JnIDxpbnRlcm5ldC1k cmFmdHNAaWV0Zi5vcmc+DQo+IFNlbnQ6IFN1bmRheSwgTm92ZW1iZXIgMTUsIDIwMjAgNjo1MiBQ TQ0KPiBUbzogU2hyYWRkaGEgSGVnZGUgPHNocmFkZGhhQGp1bmlwZXIubmV0PjsgUGV0ZXIgUHNl bmFrDQo+IDxwcHNlbmFrQGNpc2NvLmNvbT47IFJvbiBCb25pY2EgPHJib25pY2FAanVuaXBlci5u ZXQ+OyBQYXJhZyBLYW5lcml5YQ0KPiA8cGthbmVyaWFAanVuaXBlci5uZXQ+OyBSYWplc2ggTSA8 bXJhamVzaEBqdW5pcGVyLm5ldD47IFdpbGxpYW0gQnJpdHRvIEEgSg0KPiA8YndpbGxpYW1AanVu aXBlci5uZXQ+DQo+IFN1YmplY3Q6IE5ldyBWZXJzaW9uIE5vdGlmaWNhdGlvbiBmb3IgZHJhZnQt Ym9uaWNhLWxzci1pcC1mbGV4YWxnby0wMS50eHQNCj4gDQo+IFtFeHRlcm5hbCBFbWFpbC4gQmUg Y2F1dGlvdXMgb2YgY29udGVudF0NCj4gDQo+IA0KPiBBIG5ldyB2ZXJzaW9uIG9mIEktRCwgZHJh ZnQtYm9uaWNhLWxzci1pcC1mbGV4YWxnby0wMS50eHQNCj4gaGFzIGJlZW4gc3VjY2Vzc2Z1bGx5 IHN1Ym1pdHRlZCBieSBSb24gQm9uaWNhIGFuZCBwb3N0ZWQgdG8gdGhlIElFVEYNCj4gcmVwb3Np dG9yeS4NCj4gDQo+IE5hbWU6ICAgICAgICAgICBkcmFmdC1ib25pY2EtbHNyLWlwLWZsZXhhbGdv DQo+IFJldmlzaW9uOiAgICAgICAwMQ0KPiBUaXRsZTogICAgICAgICAgSUdQIEZsZXhpYmxlIEFs Z29yaXRobXMgKEZsZXgtQWxnb3JpdGhtKSBJbiBJUCBOZXR3b3Jrcw0KPiBEb2N1bWVudCBkYXRl OiAgMjAyMC0xMS0xNQ0KPiBHcm91cDogICAgICAgICAgSW5kaXZpZHVhbCBTdWJtaXNzaW9uDQo+ IFBhZ2VzOiAgICAgICAgICAxNw0KPiBVUkw6DQo+IGh0dHBzOi8vd3d3LmlldGYub3JnL2FyY2hp dmUvaWQvZHJhZnQtYm9uaWNhLWxzci1pcC1mbGV4YWxnby0wMS50eHQNCj4gU3RhdHVzOg0KPiAg aHR0cHM6Ly9kYXRhdHJhY2tlci5pZXRmLm9yZy9kb2MvZHJhZnQtYm9uaWNhLWxzci0gaXAtZmxl eGFsZ28NCj4gSHRtbGl6ZWQ6DQo+IGh0dHBzOi8vZGF0YXRyYWNrZXIuaWV0Zi5vcmcvZG9jL2h0 bWwvZHJhZnQgYm9uaWNhLWxzci1pcC1mbGV4YWxnbw0KDQoNCj4gQWJzdHJhY3Q6DQo+ICAgIEFu IElHUCBGbGV4aWJsZSBBbGdvcml0aG0gKEZsZXgtQWxnb3JpdGhtKSBhbGxvd3MgSUdQIHRvIGNv bXB1dGUNCj4gICAgY29uc3RyYWludC1iYXNlZCBwYXRocy4gIEFzIGN1cnJlbnRseSBkZWZpbmVk LCBJR1AgRmxleC1BbGdvcml0aG0gaXMNCj4gICAgdXNlZCB3aXRoIFNlZ21lbnQgUm91dGluZyAo U1IpIGRhdGEgcGxhbmVzIC0gU1IgTVBMUyBhbmQgU1J2Ni4NCj4gICAgVGhlcmVmb3JlLCBGbGV4 LUFsZ29yaXRobSBjYW5ub3QgYmUgZGVwbG95ZWQgaW4gdGhlIGFic2VuY2Ugb2YgU1IuDQo+IA0K PiAgICBUaGlzIGRvY3VtZW50IGV4dGVuZHMgSUdQIEZsZXgtQWxnb3JpdGhtLCBzbyB0aGF0IGl0 IGNhbiBiZSB1c2VkIGZvcg0KPiAgICByZWd1bGFyIElQdjQgYW5kIElQdjYgcHJlZml4ZXMuICBU aGlzIGFsbG93cyBGbGV4LUFsZ29yaXRobSB0byBiZQ0KPiAgICBkZXBsb3llZCBpbiBhbnkgSVAg bmV0d29yaywgZXZlbiBpbiB0aGUgYWJzZW5jZSBvZiBTUi4NCj4gDQo+IA0KPiANCj4gDQo+IFBs ZWFzZSBub3RlIHRoYXQgaXQgbWF5IHRha2UgYSBjb3VwbGUgb2YgbWludXRlcyBmcm9tIHRoZSB0 aW1lIG9mIHN1Ym1pc3Npb24NCj4gdW50aWwgdGhlIGh0bWxpemVkIHZlcnNpb24gYW5kIGRpZmYg YXJlIGF2YWlsYWJsZSBhdCB0b29scy5pZXRmLm9yZy4NCj4gDQo+IFRoZSBJRVRGIFNlY3JldGFy aWF0DQo+IA0K From nobody Sun Nov 15 17:59:55 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id BC4773A0E71 for ; 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charset="UTF-8" Content-Transfer-Encoding: quoted-printable =0A
Hello WG and Author= s,
 I have read the draft.
 I= t is a good idea to use IGP extension to notification the HBH ablility.
 Commments as follow:
 1. How to enable the IGP extensions for HBH= =EF=BC=9F
 2= . Does the IGP use the HBH option as criterion t= o genernate a new topo= logy? 

BR.
Huanan Chen

<= /span>
Fr= om: wangyali
Date: 2020-10-29 21:19
Subject: = ;[Lsr] New Version for draft-wang-lsr-hbh-process-00
Hello WG,
=0A
 
=0A
Considering the Hop-by-Ho= p Options header has been used for IOAM [I-D.ietf-ippm-ioam-ipv6-options],= Alternate Marking method [I-D.ietf-6man-ipv6-alt-mark], etc., but as spec= ified in RFC8200, the Hop-by-Hop Options header is only examined and proce= ssed if it is explicitly configured. In this case, nodes may be configured= to ignore the Hop-by-Hop Options header, drop packets containing a Hop-by= -Hop Options header, or assign packets containing a Hop-by-Hop Options hea= der to a slow processing path. Thus, the performance measurement does not = account for all links and nodes along a path. In addition, packets carryin= g a Hop-by-Hop Options header may be dropped, which gravely deteriorates n= etwork performance.
=0A
 
=0A
Therefore, we propose= a new draft about IGP extensions for signaling Hop-by-Hop Options header = processing action at node and link granularity. Such advertisement is usef= ul for entities (e.g., the centralized controller) to gather each router's= processing action for achieving the computation of TE paths that be able = to support a specific service encoded in the Hop-by-Hop Options header.=0A
 
=0A
Please let us know your opinion. Questions = and comments are very welcome.
=0A
 
=0A
Best regar= ds,
=0A
Yali
=0A
 
=0A
 
=0A-----Original Message-----
=0A
From: internet-drafts@ietf.org [m= ailto:internet-drafts@ietf.org]
=0A
Sent: Thursday, October 29, 2= 020 8:42 PM
=0A
To: Tianran Zhou <zhoutianran@huawei.com>; = Huzhibo <huzhibo@huawei.com>; wangyali <wangyali11@huawei.com>=
=0A
Subject: New Version Notification for draft-wang-lsr-hbh-pro= cess-00.txt
=0A
 
=0A
 
=0A
A new ver= sion of I-D, draft-wang-lsr-hbh-process-00.txt has been successfully submi= tted by Yali Wang and posted to the IETF repository.
=0A
 =0A
Name:         &nb= sp; draft-wang-lsr-hbh-process
=0A
Revision:   &nb= sp;   00
=0A
Title:      =     IGP Extensions for Advertising Hop-by-Hop Options Heade= r Processing Action
=0A
Document date:  2020-10-29
=0A<= div>Group:          Individua= l Submission
=0A
Pages:       =    10
=0A
URL:       = ;     https://www.ietf.org/archive/id/draft-wang-lsr-h= bh-process-00.txt
=0A
Status:      =    https://datatracker.ietf.org/doc/draft-wang-lsr-hbh-process/<= /div>=0A
Htmlized:       https://datatra= cker.ietf.org/doc/html/draft-wang-lsr-hbh-process
=0A
Htmlized:&n= bsp;      https://tools.ietf.org/html/draft-wang-= lsr-hbh-process-00
=0A
 
=0A
 
=0A
Ab= stract:
=0A
   This document extends Node and Link attr= ibute TLVs to Interior
=0A
   Gateway Protocols (IGP) t= o advertise the Hop-by-Hop Options header
=0A
   proces= sing action and supported services (e.g.  IOAM Trace Option and
= =0A
   Alternate Marking) at node and link granularity. = ; Such advertisements
=0A
   allow entities (e.g., cent= ralized controllers) to determine whether
=0A
   the Ho= p-by-Hop Options header and specific services can be supported
=0A   in a given network.
=0A
 
=0A
 =
=0A
 
=0A
 
=0A
 
=0A
= Please note that it may take a couple of minutes from the time of submissi= on until the htmlized version and diff are available at tools.ietf.org.=0A
 
=0A
The IETF Secretariat
=0A
 =0A
 
=0A
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wangyali To: "chenhuan6@chinatelecom.cn" , "lsr@ietf.org" Thread-Topic: [Lsr] New Version for draft-wang-lsr-hbh-process-00 Thread-Index: AQHWu7wvJYUVs4ZISkeD7QFauHzf7qnKAtdA Date: Mon, 16 Nov 2020 02:55:05 +0000 Message-ID: <1520992FC97B944A9979C2FC1D7DB0F4050BDCF2@dggeml524-mbx.china.huawei.com> References: <1520992FC97B944A9979C2FC1D7DB0F4050519D2@dggeml524-mbx.china.huawei.com> <2020111312071288332716@chinatelecom.cn> In-Reply-To: <2020111312071288332716@chinatelecom.cn> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.108.243.136] Content-Type: multipart/alternative; boundary="_000_1520992FC97B944A9979C2FC1D7DB0F4050BDCF2dggeml524mbxchi_" MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: Re: [Lsr] New Version for draft-wang-lsr-hbh-process-00 X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: 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([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id cbiBIUlCCtw5 for ; Sun, 15 Nov 2020 19:07:24 -0800 (PST) Received: from mail-m127101.qiye.163.com (mail-m127101.qiye.163.com [115.236.127.101]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 572363A10A0 for ; Sun, 15 Nov 2020 19:07:23 -0800 (PST) Received: from DESKTOP2IOH5QC (unknown [219.142.69.75]) by mail-m127101.qiye.163.com (Hmail) with ESMTPA id 8A7C24810E; Mon, 16 Nov 2020 11:07:17 +0800 (CST) From: "Aijun Wang" To: "'Robert Raszuk'" , "'Jeff Tantsura'" Cc: "'lsr'" , "'Acee Lindem \(acee\)'" References: In-Reply-To: Date: Mon, 16 Nov 2020 11:07:17 +0800 Message-ID: <020d01d6bbc5$9769e7e0$c63db7a0$@tsinghua.org.cn> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_020E_01D6BC08.A58EAE80" X-Mailer: Microsoft Outlook 16.0 Content-Language: zh-cn Thread-Index: AQGcUPTXJ+U6NoAo7cvOT28mq+owYAHx0eBhAYxY8GmqIvABYA== X-HM-Spam-Status: e1kfGhgUHx5ZQUtXWQgYFAkeWUFZS1VLWVdZKFlBSkxLS0o3V1ktWUFJV1 kPCRoVCBIfWUFZS00eTUJNT0NDTkweVkpNS05PQk1LSExDS0pVEwETFhoSFyQUDg9ZV1kWGg8SFR 0UWUFZT0tIVUpKS09ISFVLWQY+ X-HM-Sender-Digest: e1kMHhlZQR0aFwgeV1kSHx4VD1lBWUc6OBw6Cxw*KD8ePwo3LhkjHAgJ EBIwCkJVSlVKTUtOT0JNS0hDSEtCVTMWGhIXVQwaFRwaEhEOFTsPCBIVHBMOGlUUCRxVGBVFWVdZ EgtZQVlJSkJVSk9JVU1CVUxOWVdZCAFZQUlJTkJNNwY+ X-HM-Tid: 0a75cf05614c9865kuuu8a7c24810e Archived-At: Subject: Re: [Lsr] Prefix Unreachable Announcement Use Cases X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 16 Nov 2020 03:07:26 -0000 This is a multipart message in MIME format. ------=_NextPart_000_020E_01D6BC08.A58EAE80 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Hi, Robert: =20 Does the following responses satisfy your concerns If I understand your = questions correctly?=20 =20 From: lsr-bounces@ietf.org [mailto:lsr-bounces@ietf.org] On Behalf Of = Robert Raszuk Sent: Monday, November 16, 2020 4:04 AM To: Jeff Tantsura Cc: lsr ; Aijun Wang ; Acee = Lindem (acee) Subject: Re: [Lsr] Prefix Unreachable Announcement Use Cases =20 Jeff,=20 =20 I was not bringing RIFT's negative routies example as something = inherently negative. I was just pointing it out to illustrate that = today's data plane lookup does not really support "if does not match" = checks. [WAJ] In data plane, the device do still the =E2=80=9Cmatch=E2=80=9D = check, not =E2=80=9Cdoes not match=E2=80=9D check. When the router = receives the PUA information, it will install one black hole route for a = short time.=20 =20 =20 So if you intend to use unreachable prefixes in data plane as result you = need to break summary into as atomic prefixes as your unreachable = advertisement mask.=20 [WAJ] When the number of unreachable prefixes is limited(this is the = common situation), Summary Route+PUA is the most efficient solution. =20 Hence my recommendation to use IGP to flood unreachable only for the = purpose of control plane (namely BGP paths invalidation).=20 [WAJ] PUA and =E2=80=9CSmart Disaggregation=E2=80=9D in RIFT aim to the = same problems, but there are some differences: 1. In RIFT, the parallel node will advertise the detailed prefix = when it detects that another node on the same level can=E2=80=99t reach = the mentioned prefix. But for PUA, the decision/advertisement is made by = the ABR node itself that knows the failure of links/nodes.=20 2. The advertisement information is different. In RIFT, the detail = prefix information is advertised(by another node that can reach the = failure prefix); in PUA, the detail unreachable prefix information is = advertised instead(by the node that can=E2=80=99t reach the failure = prefix).=20 After knowing this information, the receiver node can switch the path = to send the traffic, or trigger the BGP control plane switchover as you = said. =20 Cheers, R. =20 On Sun, Nov 15, 2020 at 8:29 PM Jeff Tantsura > wrote: As RIFT chair - I=E2=80=99d like to respond to Robert=E2=80=99 comment - = the example is rather unfortunate, in RIFT disaggregation is = conditional and well contained within its context, it doesn=E2=80=99t = affect overall scalability. Regards, Jeff On Nov 15, 2020, at 08:44, Robert Raszuk > wrote: =EF=BB=BF Hi Aijun, =20 I would in fact only propose that the presented mechanism is narrowed = down to invalidate BGP (service) routes - in fact their next hops.=20 =20 The reason being that the moment you make the solution generic, moreover = the moment you want it to be used in RIB and data plane I am afraid you = are running into similar (even if local) deaggregation mechanism like = recently described in RIFT. That would kill all the scalability of = advertising summary routes in the first place and I bet would face lots = of opposition.=20 =20 Thx, R. =20 I would actually trim most use cases leaving just one - to signal remote = service node (ex: PE) going down in the presence of summary route being = advertised from remote area or pop.=20 [WAJ] Yes, this may be the most useful use case, but the PUA mechanism = can also apply to other scenarios. We want to make it one general = solution. _______________________________________________ Lsr mailing list Lsr@ietf.org =20 https://www.ietf.org/mailman/listinfo/lsr ------=_NextPart_000_020E_01D6BC08.A58EAE80 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable

H= i, Robert:

<= o:p> 

D= oes the following responses satisfy your concerns If I understand your = questions correctly?

<= o:p> 

From:<= /b> = lsr-bounces@ietf.org [mailto:lsr-bounces@ietf.org] On Behalf Of = Robert Raszuk
Sent: Monday, November 16, 2020 4:04 = AM
To: Jeff Tantsura = <jefftant.ietf@gmail.com>
Cc: lsr <lsr@ietf.org>; = Aijun Wang <wangaijun@tsinghua.org.cn>; Acee Lindem (acee) = <acee=3D40cisco.com@dmarc.ietf.org>
Subject: Re: [Lsr] = Prefix Unreachable Announcement Use Cases

 

Jeff, 

 

I was not bringing RIFT's negative routies example as = something inherently negative. I was just pointing it out to illustrate = that today's data plane lookup does not really support "if does not = match" checks.

[= WAJ] In data plane, the device do still the =E2=80=9Cmatch=E2=80=9D = check, not =E2=80=9Cdoes not match=E2=80=9D check.=C2=A0 When the router = receives the PUA information, it will install one black hole route for a = short time.

 

 

So if you intend to use unreachable prefixes in data plane = as result you need to break summary into as atomic prefixes as your = unreachable advertisement mask. 

[= WAJ] When the number of unreachable prefixes is limited(this is the = common situation), =C2=A0Summary Route+PUA is the most efficient = solution.<= o:p>

 

Hence my recommendation to use IGP to flood unreachable = only for the purpose of control plane (namely BGP paths = invalidation). 

[= WAJ] =C2=A0PUA and =E2= =80=9CSmart Disaggregation=E2=80=9D in RIFT aim to the same problems, but there are some = differences:

<= span style=3D'mso-list:Ignore'>1.     = I= n RIFT, the parallel node will advertise the detailed prefix when it = detects that another node on the same level can=E2=80=99t reach the = mentioned prefix. But for PUA, the decision/advertisement is made by the = ABR node itself that knows the failure of links/nodes. =

<= span style=3D'mso-list:Ignore'>2.     = T= he advertisement information is different. In RIFT, the detail prefix = information is advertised(by another node that can reach the failure = prefix); in PUA, the detail unreachable prefix information is advertised = instead(by the node that can=E2=80=99t reach the failure prefix). =

=C2= =A0After knowing this information, the receiver node can switch the path = to send the traffic, or trigger the BGP control plane switchover as you = said.

<= o:p> 

Cheers,

R.

 

On Sun, Nov 15, 2020 at 8:29 PM Jeff Tantsura <jefftant.ietf@gmail.com> = wrote:

As = RIFT chair - I=E2=80=99d like to respond to Robert=E2=80=99 comment - =  the example is rather  unfortunate, in RIFT disaggregation is = conditional and well contained within its context, it doesn=E2=80=99t =  affect overall scalability.

Regards,

Jeff



On = Nov 15, 2020, at 08:44, Robert Raszuk <robert@raszuk.net> = wrote:

=EF=BB=BF

Hi Aijun,

 

I would in fact only propose that the presented mechanism = is narrowed down to invalidate BGP (service) routes - in fact their = next hops. 

 

The reason being that the moment you make the solution = generic, moreover the moment you want it to be used in RIB and data = plane I am afraid you are running into similar (even if local) = deaggregation mechanism like recently described in RIFT. That would kill = all the scalability of advertising summary routes in the first place and = I bet would face lots of = opposition. 

 

Thx,

R.

 

I would actually trim most use cases leaving just one - to = signal remote service node (ex: PE) going down in the presence of = summary route being advertised from remote area or = pop. 

 [WAJ] Yes, this may be the most useful use case, but = the PUA mechanism can also apply to other scenarios. We want to make it = one general solution.

_______________________________________________
Lsr = mailing list
Lsr@ietf.org
https://www.ietf.org/mailman/listinfo/lsr

------=_NextPart_000_020E_01D6BC08.A58EAE80-- From nobody Sun Nov 15 22:01:05 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0D9353A13B2; Sun, 15 Nov 2020 22:00:55 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: 1.225 X-Spam-Level: * X-Spam-Status: No, score=1.225 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DOS_OUTLOOK_TO_MX=2.845, HTML_MESSAGE=0.001, KHOP_HELO_FCRDNS=0.276, SPF_HELO_NONE=0.001, SPF_NONE=0.001, URIBL_BLOCKED=0.001] autolearn=no autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 3D3V0npK0fbl; Sun, 15 Nov 2020 22:00:52 -0800 (PST) Received: from hickoryhill-consulting.com (50-245-122-97-static.hfc.comcastbusiness.net [50.245.122.97]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id A56F43A13BC; Sun, 15 Nov 2020 22:00:51 -0800 (PST) X-Default-Received-SPF: pass (skip=forwardok (res=PASS)) x-ip-name=50.107.115.222; From: "Susan Hares" To: "'Les Ginsberg \(ginsberg\)'" , "'Ketan Talaulikar \(ketant\)'" , "'Jeff Tantsura'" , "'Stephane Litkowski \(slitkows\)'" , , "'Acee Lindem \(acee\)'" Cc: References: <050501d6b0d5$877d5970$96780c50$@ndzh.com> <033001d6b678$08d20280$1a760780$@ndzh.com> <006801d6b6de$0f89c390$2e9d4ab0$@ndzh.com> <1F8F1206-0583-4262-8837-934C10F2B034@cisco.com> <9346741d-6eda-4fbc-917f-2ac3662aac0b@Spark> <02c501d6b924$b4a34b10$1de9e130$@ndzh.com> In-Reply-To: Date: Mon, 16 Nov 2020 01:00:43 -0500 Message-ID: <04c101d6bbdd$d24e1f30$76ea5d90$@ndzh.com> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_04C2_01D6BBB3.E97F1C10" X-Mailer: Microsoft Outlook 14.0 Thread-Index: AQEvXptEERMy9oWMkRU4TGI7ipbTUQG/AvLsAaOz/IACYXuwGwIa9O9yAkjZjVsA9wFd+AHb1MpKAVwErlUB68A9+KqW5OFw Content-Language: en-us X-Antivirus: AVG (VPS 201115-4, 11/15/2020), Outbound message X-Antivirus-Status: Not-Tested X-Authenticated-User: skh@ndzh.com Archived-At: Subject: Re: [Lsr] [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu (11/1/2020 to 11/16/2020) X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 16 Nov 2020 06:00:55 -0000 This is a multipart message in MIME format. ------=_NextPart_000_04C2_01D6BBB3.E97F1C10 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Les:=20 =20 As you know, part of the chair=E2=80=99s duty is to determine if the = authors have missed mentioning something in their draft proposal. My = questions were about the BGP-only features since it seemed obvious to me = after working with the draft-ietf-idr-tunnel-encaps as a shepherd. BGP = has had direct routes since BGP-v3. =20 =20 There is appears to be interest in working on the BGP-only network and = this topic. The authors plan to resubmit the draft with a different = name and details on BGP-only. =20 =20 One way to accomplish the evaluation of the =E2=80=9CBGP only=E2=80=9D = service is to extend this WG Adoption call 1 week to allow discussion of = that the revision that contains that information. =20 =20 Cheerily, Susan Hares=20 =20 =20 =20 =20 =20 =20 =20 =20 From: Les Ginsberg (ginsberg) [mailto:ginsberg@cisco.com]=20 Sent: Friday, November 13, 2020 6:58 PM To: Ketan Talaulikar (ketant); Susan Hares; 'Jeff Tantsura'; 'Stephane = Litkowski (slitkows)'; idr@ietf.org; 'Acee Lindem (acee)' Cc: lsr@ietf.org Subject: RE: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu = (11/1/2020 to 11/16/2020) =20 The points which Ketan has made regarding the use of MTU advertisements = defined in RFC 7176 are very valid. Indeed, the contents of the sub-TLV = defined in https://www.rfc-editor.org/rfc/rfc7176.html#section-2.4 = depend upon the TRILL specific MTU-probe/MTU-ack procedures defined in = https://www.rfc-editor.org/rfc/rfc6325#section-4.4.3. These procedures = are not currently applicable to non-TRILL environments. =20 So, there are no existing IGP advertisements defined which can support = the goals of this draft. =20 As Ketan has also indicated, there is no discussion in the draft of how = a BGP only network (for example) could provide the information of = interest. =20 >From my perspective, WG adoption of this draft in ANY WG is premature. This might be a useful functionality to have =E2=80=93 but at the moment = we simply have an idea with no definition of how to implement/deploy it. =20 So I therefore oppose WG adoption of this draft by IDR. =20 Continuing the discussion is certainly useful =E2=80=93 and I would = encourage the current authors to investigate and propose relevant = mechanisms in all the protocols of interest in some future version of = the draft. At that point we could then have a far more meaningful WG adoption call. =20 Les =20 =20 From: Idr On Behalf Of Ketan Talaulikar (ketant) Sent: Friday, November 13, 2020 1:35 AM To: Susan Hares ; 'Jeff Tantsura' = ; 'Stephane Litkowski (slitkows)' = ; idr@ietf.org; 'Acee Lindem = (acee)' Cc: lsr@ietf.org Subject: Re: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu = (11/1/2020 to 11/16/2020) =20 Hi Authors, =20 I believe this work is useful and should be taken up. It has value in = providing the link MTU as part of the topology information via BGP-LS. = However, as pointed out by others on this thread, the draft should = remain scoped to just that =E2=80=93 i.e. providing link MTU = information. The discussion related to Path MTU and applicability to SR = networks are best left outside the scope of this standards track draft. =20 Hi Sue, =20 I would support the points made by Acee for not taking up this draft in = IDR WG and instead doing this in LSR.=20 =20 Besides the missing coverage for OSPFv2/v3, there are also issues with = how this would work with ISIS. The reference to the ISIS Trill = specification points to this TLV = https://tools.ietf.org/html/rfc7176#section-2.4 =E2=80=93 if you see, = there is more here than just the MTU value. What is more critical is the = ISIS procedures (in non-Trill deployments) on how this value is = determined. Please do not mix the following : =20 The MTU sub-TLV is used to optionally announce the MTU of a link as specified in [RFC6325], Section = 4.2.4.4. =20 Are the authors trying to specify that these Trill procedures for = testing MTU need to be adopted for regular ISIS deployments. =20 My take is that while the ISIS TLV defined for Trill may be re-used in = normal ISIS deployments, its usage and procedures need to be specified. = Copying the LSR WG so that I may be corrected if I am wrong here. =20 Coming to the point of BGP-only networks, the draft has zero text = related to that scenario. Moreover, the procedures for BGP-LS = advertisements in BGP only fabric need to be specified as a base. The = https://datatracker.ietf.org/doc/draft-ketant-idr-bgp-ls-bgp-only-fabric/= was my attempt to specify those procedures and it would be great if the = IDR WG could review and provide feedback to this document and consider = for adoption so we can cover the BGP-only networks. =20 I would also like to offer support/help to the authors in adding the = necessary OSPFv2/v3 support for the same in an LSR draft where we could = tackle both the IGPs and BGP-LS encoding and procedures together. =20 Thanks, Ketan =20 From: Idr On Behalf Of Susan Hares Sent: 13 November 2020 00:20 To: 'Jeff Tantsura' ; 'Stephane Litkowski = (slitkows)' ; idr@ietf.org; 'Acee = Lindem (acee)' Subject: Re: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu = (11/1/2020 to 11/16/2020) =20 Jeff and Authors of draft-zhu-idr-bgp-ls-path-mtu:=20 =20 I do believe the authors agreed to renaming the draft. =20 =20 Does the name: draft-xxx-idr-bgp-ls-link-mtu work for=20 the authors and interested IDR participants.=20 =20 As the end of 12 days of the 14 day WG LC, this draft appears=20 to have general consensus from the WG as a useful draft.=20 =20 I plan to allow 2 more days of comment, but at this point=20 it appears the WG wishes to adopt this draft. =20 =20 Here=E2=80=99s my understanding of the best way forward:=20 =20 If LSR adopts a version of the draft, IDR will allow the=20 LSR WG to be the main source as long as cross-working=20 review occurs so the BGP-only function can be reviewed.=20 =20 Please continue to comment on the draft and=20 the planned progression.=20 =20 Cheers, Sue=20 =20 From: Jeff Tantsura [mailto:jefftant.ietf@gmail.com]=20 Sent: Thursday, November 12, 2020 12:53 PM To: Susan Hares; Stephane Litkowski (slitkows); idr@ietf.org; Acee = Lindem (acee) Subject: Re: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu = (11/1/2020 to 11/16/2020) =20 +1 to everything Acee said =20 Cheers,=20 Jeff On Nov 10, 2020, 1:01 PM -0800, Acee Lindem (acee) = , wrote: Speaking as an IDR WG member: =20 The name of the draft is wrong =E2=80=93 the extension is for a Link MTU = and not a path MTU. =20 Speaking as LSR Chair: =20 We could this in LSR as there is currently no MTU advertisement in the = LSAs for OSPFv2 and OSPFv3. Implementations already make use of this = information as it is used in the OSPF DBD packets and for LSA packing. = Of course, we=E2=80=99d require a more accurate draft name and title. =20 Thanks, Acee =20 From: Idr on behalf of Susan Hares = Date: Monday, November 9, 2020 at 4:20 PM To: "'Stephane Litkowski (slitkows)'" = , IDR List Subject: Re: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu = (11/1/2020 to 11/16/2020) =20 Stephane: =20 My second message to this thread asked a few questions about the = technology. =20 =20 This information can be more than IGP information. If SR segments = statically defined (static or direct interfaces) tunnels and pass the = endpoints via BGP tunnel-encaps draft with SR Policy tunnel type, this = can just be BGP. =20 I=E2=80=99ll keep this WG adoption call going until we can be sure if: = 1) it something LSR wants to standardize, and 2) whether there is a BGP = only case. It is clear to me that standardizing MTU for a SR segments = with stacked tunnel segments passed by BGP was useful. =20 The authors should be the ones to propose this in LSR. =20 =20 Cheers, Sue =20 From: Idr [mailto:idr-bounces@ietf.org] On Behalf Of Stephane Litkowski = (slitkows) Sent: Monday, November 9, 2020 4:28 AM To: Susan Hares; idr@ietf.org Subject: Re: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu = (11/1/2020 to 11/16/2020) =20 Hi Sue, =20 > The purpose behind this mechanism is to reduce administrative work = rather than to reduce the review on drafts. =20 That=E2=80=99s exactly my point. If we don=E2=80=99t do OSPF extension = now and in the same draft, we leave a gap that will require a new draft = for a very very small extension. Just adds process overhead for = nothing=E2=80=A6 =20 =20 Stephane =20 =20 From: Susan Hares Sent: lundi 9 novembre 2020 10:10 To: Stephane Litkowski (slitkows) ; idr@ietf.org Subject: RE: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu = (11/1/2020 to 11/16/2020) =20 Stephane: =20 I want to pick up on your email from two points: =20 1) Why not do everything in LSR?=20 If the feature comes with interest in doing all 3 (ISIS, OSPF, and = BGP-LS data gathering), then the authors may select to do everything in = LSR rather than have 2 or 3 drafts to maintain. =20 This is optional and the mechanism may not fit every draft. The drafts = may also start out adopted and vetted in LSR and IDR. The purpose = behind this mechanism is to reduce administrative work rather than to = reduce the review on drafts. =20 =20 =20 2) TRILL implementations of IS-IS has some MTU subTLV -=20 =20 If you are interested in whether this has been implemented in TRILL, you = might want to check with Donald Eastlake. My vague and foggy = recollection is that had some implementations or came from pre-TRILL = implementations. =20 =20 Cheers, Susan Hares =20 =20 =20 From: Stephane Litkowski (slitkows) [mailto:slitkows@cisco.com] Sent: Wednesday, November 4, 2020 3:03 AM To: Susan Hares; idr@ietf.org Subject: RE: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu = (11/1/2020 to 11/16/2020) =20 Hi, =20 =E2=80=9Ca) Are there ways to pass IGP link MTUs in the IGPs? If so, is this needed in BGP-LS=E2=80=9D =20 This is a valid point, most of the time BGP-LS is feeded by IGP LSDBs = (of course there are other ways too). While I see that IS-IS has some = MTU subTLV coming from TRILL RFC7176 (possibly never been implemented), = I don=E2=80=99t see anything for OSPF (I=E2=80=99m not an OSPF expert, = so I may have missed it). Shouldn=E2=80=99t this be checked and validated with LSR WG before = adopting ? =20 =20 Stephane =20 =20 From: Idr On Behalf Of Susan Hares Sent: lundi 2 novembre 2020 06:04 To: idr@ietf.org Subject: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu (11/1/2020 = to 11/16/2020) =20 This begins a 2 week WG adoption call for draft-zhu-idr-bgp-ls-path-mtu-04.txt (11/1 =E2=80=93 11/16/2020). =20 The authors should send in an IPR statement for this draft by 11/5 so the WG can include the IPR status in their decision. =20 You can access the draft at: https://datatracker.ietf.org/doc/draft-zhu-idr-bgp-ls-path-mtu/ =20 Since this draft is reference by an existing IDR draft I=E2=80=99ve included a bit of background below to help you place =20 this draft into the larger context of the SR additions to BGP-LS and the draft-ietf-idr-tunnel-encaps-19.txt. =20 This draft does continue BGP-LS additions. if you=20 are opposed to any BGP-LS additions rather than=20 this specific addition, please make that clear in your=20 comment in this discussion. =20 =20 The authors requested a WG adoption at IETF 108.=20 The IDR co-chairs thank the authors for their patience. =20 This draft has been delayed by process of having a new document shepherd (Sue Hares) come up to speed on draft-ietf-idr-tunnel-encapsulation. =20 Cheers, Sue =20 Background =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D Segment Routing technology creates SR tunnels that are directly overlaid on MPLS or SRv6. While existing MPLS technology (LDP and RSV-TE) provides mechanisms to negotiate path MTU based on individual link MTU limits, the Segment Routing (SR) on BGP-LS Link Attribute does not pass information on MTU size per link. =20 =20 draft-ietf-idr-sr-policy-path-mtu-02.txt sends PATH MTU information in the tunnel-encapsulation attribute for the tunnel type =20 SR-Policy that handles segment routing (SR) paths. =20 However, it lacks the information to create a reasonable Path size since the BGP-LS Link Attribute does distribute this information. =20 The draft proposes adding a new sub-TLV for MTU size to the BGP-LS Link Attribute TLV, and draft-ietf-idr-sr-policy-path-mtu-02.txt mentions this draft as one possible way to distribute the per link MTU. =20 =20 Questions for the authors might be: a) Are there ways to pass IGP link MTUs in the IGPs? If so, is this needed in BGP-LS =20 b) What other mechanisms pass link MTU? =20 =20 =20 =20 =20 =20 =20 =20 _______________________________________________ Idr mailing list Idr@ietf.org https://www.ietf.org/mailman/listinfo/idr ------=_NextPart_000_04C2_01D6BBB3.E97F1C10 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable

Les:

 

As you know, part of the chair=E2=80=99s duty is to determine if the = authors have missed mentioning something in their draft proposal.=C2=A0 = My questions were about the BGP-only features since it seemed obvious to = me after working with the draft-ietf-idr-tunnel-encaps as a = shepherd.=C2=A0 =C2=A0BGP has had direct routes since BGP-v3.=C2=A0 =

 

There is appears to be interest in working on the BGP-only network = and this topic.=C2=A0 =C2=A0The authors plan to resubmit the draft with = a different name and details on BGP-only. =C2=A0

 

One way to accomplish the evaluation of the =E2=80=9CBGP = only=E2=80=9D service is to extend this WG Adoption call 1 week to allow = discussion of that the revision that contains that information. = =C2=A0=C2=A0

 

Cheerily, Susan Hares

 

 

 

 

 

 

 

 

From:= = Les Ginsberg (ginsberg) [mailto:ginsberg@cisco.com]
Sent: = Friday, November 13, 2020 6:58 PM
To: Ketan Talaulikar = (ketant); Susan Hares; 'Jeff Tantsura'; 'Stephane Litkowski (slitkows)'; = idr@ietf.org; 'Acee Lindem (acee)'
Cc: = lsr@ietf.org
Subject: RE: [Idr] WG Adoption for = draft-zhu-idr-bgp-ls-path-mtu (11/1/2020 to = 11/16/2020)

 

The points = which Ketan has made regarding the use of MTU advertisements defined in = RFC 7176 are very valid. Indeed, the contents of the sub-TLV defined in = https://= www.rfc-editor.org/rfc/rfc7176.html#section-2.4 depend upon the = TRILL specific MTU-probe/MTU-ack procedures defined in https://www= .rfc-editor.org/rfc/rfc6325#section-4.4.3. These procedures are not = currently applicable to non-TRILL environments.

 =

So, there = are no existing IGP advertisements defined which can support the goals = of this draft.

 =

As Ketan = has also indicated, there is no discussion in the draft of how a BGP = only network (for example) could provide the information of = interest.

 =

From my = perspective, WG adoption of this draft in ANY WG is = premature.

This might = be a useful functionality to have =E2=80=93 but at the moment we simply = have an idea with no definition of how to implement/deploy = it.

 =

So I = therefore oppose WG adoption of this draft by = IDR.

 =

Continuing = the discussion is certainly useful =E2=80=93 and I would encourage the = current authors to investigate and propose relevant mechanisms in all = the protocols of interest in some future version of the = draft.

At that = point we could then have a far more meaningful WG adoption = call.

 =

  = ; Les

 =

 =

From: Idr = <idr-bounces@ietf.org> On Behalf Of Ketan Talaulikar = (ketant)
Sent: Friday, November 13, 2020 1:35 AM
To: = Susan Hares <shares@ndzh.com>; 'Jeff Tantsura' = <jefftant.ietf@gmail.com>; 'Stephane Litkowski (slitkows)' = <slitkows=3D40cisco.com@dmarc.ietf.org>; idr@ietf.org; 'Acee = Lindem (acee)' <acee=3D40cisco.com@dmarc.ietf.org>
Cc: = lsr@ietf.org
Subject: Re: [Idr] WG Adoption for = draft-zhu-idr-bgp-ls-path-mtu (11/1/2020 to = 11/16/2020)

 

Hi = Authors,

 =

I believe = this work is useful and should be taken up. It has value in providing = the link MTU as part of the topology information via BGP-LS. However, as = pointed out by others on this thread, the draft should remain scoped to = just that =E2=80=93 i.e. providing link MTU information. The discussion = related to Path MTU and applicability to SR networks are best left = outside the scope of this standards track draft.

 =

Hi = Sue,

 =

I would = support the points made by Acee for not taking up this draft in IDR WG = and instead doing this in LSR.

 =

Besides = the missing coverage for OSPFv2/v3, there are also issues with how this = would work with ISIS. The reference to the ISIS Trill specification = points to this TLV https://tools.ie= tf.org/html/rfc7176#section-2.4 =E2=80=93 if you see, there is more = here than just the MTU value. What is more critical is the ISIS = procedures (in non-Trill deployments) on how this value is determined. = Please do not mix the following :

 =

The MTU = sub-TLV is used to optionally announce the MTU of a link = as

   specified in [RFC6325], = Section 4.2.4.4.

 =

Are the = authors trying to specify that these Trill procedures for testing MTU = need to be adopted for regular ISIS deployments.

 =

My take is = that while the ISIS TLV defined for Trill may be re-used in normal ISIS = deployments, its usage and procedures need to be specified. Copying the = LSR WG so that I may be corrected if I am wrong = here.

 =

Coming to = the point of BGP-only networks, the draft has zero text related to that = scenario. Moreover, the procedures for BGP-LS advertisements in BGP only = fabric need to be specified as a base. The https://datatracker.ietf.org/doc/draft-ketant-idr-bgp-ls-bgp-on= ly-fabric/ was my attempt to specify those procedures and it would = be great if the IDR WG could review and provide feedback to this = document and consider for adoption so we can cover the BGP-only = networks.

 =

I would = also like to offer support/help to the authors in adding the necessary = OSPFv2/v3 support for the same in an LSR draft where we could tackle = both the IGPs and BGP-LS encoding and procedures = together.

 =

Thanks,

Ketan<= /o:p>

 =

From: Idr = <idr-bounces@ietf.org> = On Behalf Of Susan Hares
Sent: 13 November 2020 = 00:20
To: 'Jeff Tantsura' <jefftant.ietf@gmail.com>; = 'Stephane Litkowski (slitkows)' <slitkows=3D40cisco.= com@dmarc.ietf.org>; idr@ietf.org; 'Acee Lindem (acee)' = <acee=3D40cisco.com@dmar= c.ietf.org>
Subject: Re: [Idr] WG Adoption for = draft-zhu-idr-bgp-ls-path-mtu (11/1/2020 to = 11/16/2020)

 

Jeff and Authors of draft-zhu-idr-bgp-ls-path-mtu: =

 

I do believe the authors agreed to renaming the draft.  =  

 

Does the name:   draft-xxx-idr-bgp-ls-link-mtu work for =

the authors and interested IDR participants.

 

As the end of 12 days of the 14 day WG LC, this draft appears =

to have general consensus from the WG as a useful draft. =

 

I plan to allow 2 more days of comment, but at this point =

it appears the WG wishes to adopt this draft.  =

 

Here=E2=80=99s my understanding of the best way forward: =

 

If LSR adopts a version of the draft, IDR will allow the =

LSR WG to be the main source as long as cross-working =

review occurs so the BGP-only function can be reviewed. =

 

Please continue to comment on the draft and

the planned progression.

 

Cheers,  Sue

 

From:= = Jeff Tantsura [mailto:jefftant.ietf@gmail.com]
Sent: Thursday, November 12, 2020 12:53 PM
To: = Susan Hares; Stephane Litkowski (slitkows); idr@ietf.org; Acee Lindem = (acee)
Subject: Re: [Idr] WG Adoption for = draft-zhu-idr-bgp-ls-path-mtu (11/1/2020 to = 11/16/2020)

 

+1 to everything = Acee said

 

Cheers, =

Jeff

On Nov 10, 2020, 1:01 PM -0800, Acee = Lindem (acee) <acee=3D40cisco.com@dmar= c.ietf.org>, wrote:

Speaking as = an IDR WG member:

 <= /o:p>

The name of = the draft is wrong =E2=80=93 the extension is for a Link MTU and not a = path MTU.

 <= /o:p>

Speaking as = LSR Chair:

 <= /o:p>

We could = this in LSR as there is currently no MTU advertisement in the LSAs for = OSPFv2 and OSPFv3. Implementations already make use of this information = as it is used in the OSPF DBD packets and for LSA packing. Of course, = we=E2=80=99d require a more accurate draft name and = title.

 <= /o:p>

Thanks,=

Acee

 <= /o:p>

From: Idr <idr-bounces@ietf.org> on = behalf of Susan Hares <shares@ndzh.com>
Date: = Monday, November 9, 2020 at 4:20 PM
To: "'Stephane = Litkowski (slitkows)'" <slitkows=3D40cisco.= com@dmarc.ietf.org>, IDR List <idr@ietf.org>
Subject: Re: = [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu (11/1/2020 to = 11/16/2020)

 

Stephane:

 

My second message to this thread = asked a few questions about the technology.  =  

 

This information can be more than IGP = information.   If SR segments statically defined (static or = direct interfaces) tunnels and pass the endpoints via BGP tunnel-encaps = draft with SR Policy tunnel type, this can just be = BGP.

 

I=E2=80=99ll keep this WG adoption = call going until we can be sure if:  1) it something LSR wants to = standardize, and 2) whether there is a BGP only case.   It is = clear to me that standardizing MTU for a SR segments with stacked tunnel = segments passed by BGP was useful.

 

The authors should be the ones to = propose this in LSR.   =     

 

Cheers, =  Sue

 

From:= Idr [mailto:idr-bounces@ietf.org] = On Behalf Of Stephane Litkowski (slitkows)
Sent: = Monday, November 9, 2020 4:28 AM
To: Susan Hares; idr@ietf.org
Subject: Re: = [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu (11/1/2020 to = 11/16/2020)

 

Hi Sue,

 

> The purpose behind this = mechanism is to reduce administrative work rather than to reduce the = review on drafts.

 

That=E2=80=99s exactly my point. If we don=E2=80=99t do OSPF = extension now and in the same draft, we leave a gap that will require a = new draft for a very very small extension. Just adds process overhead = for nothing=E2=80=A6

 

 

Stephane

 

 

From: Susan Hares <shares@ndzh.com>
Sent: = lundi 9 novembre 2020 10:10
To: Stephane Litkowski (slitkows) = <slitkows@cisco.com>; idr@ietf.org
Subject: RE: = [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu (11/1/2020 to = 11/16/2020)

 

Stephane:

 

I want to pick up on your email from = two points:

 

1)  Why not do everything in = LSR? 

<WG-chair = hat>

If the feature comes with interest in = doing all 3 (ISIS, OSPF, and BGP-LS data gathering), then the authors = may select to do everything in LSR rather than have 2 or 3 drafts to = maintain.

 

This is optional and the mechanism = may not fit every draft.   The drafts may also start out = adopted and vetted in LSR and IDR.    The purpose behind = this mechanism is to reduce administrative work rather than to reduce = the review on drafts.

 

</wg-chair hat = off>

 

 

2) TRILL implementations of = IS-IS has some MTU subTLV - 

 

If you are interested in whether this has been implemented in = TRILL, you might want to check with Donald Eastlake.   My = vague and foggy recollection is that had some implementations or came = from pre-TRILL implementations.

 

 

Cheers, Susan Hares

 

 

 

From:= Stephane = Litkowski (slitkows) [mailto:slitkows@cisco.com]
S= ent: Wednesday, November 4, 2020 3:03 AM
To: Susan Hares; = idr@ietf.org
Subject: RE: = [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu (11/1/2020 to = 11/16/2020)

 

Hi,

 

=E2=80=9Ca) Are there ways to pass IGP link MTUs = in

the IGPs?  If so, is this needed in = BGP-LS=E2=80=9D

 

This is a valid point, most of the time BGP-LS is feeded by IGP = LSDBs (of course there are other ways too). While I see that IS-IS has = some MTU subTLV coming from TRILL RFC7176 (possibly never been = implemented), I don=E2=80=99t see anything for OSPF (I=E2=80=99m not an = OSPF expert, so I may have missed it).

Shouldn=E2=80=99t this be checked and validated with LSR WG before = adopting ?

 

 

Stephane

 

 

From: Idr <idr-bounces@ietf.org> On = Behalf Of Susan Hares
Sent: lundi 2 novembre 2020 = 06:04
To: idr@ietf.org
Subject: [Idr] = WG Adoption for draft-zhu-idr-bgp-ls-path-mtu (11/1/2020 to = 11/16/2020)

 

This begins a 2 week WG adoption call for

draft-zhu-idr-bgp-ls-path-mtu-04.txt (11/1 =E2=80=93 = 11/16/2020).

 

The authors should send in an IPR statement for this = draft

by 11/5 so the WG can include the IPR status in their = decision.

 

You can access the draft at:

= https://datatracker.ietf.org/doc/draft-zhu-idr-bgp-ls-path-mtu/<= /o:p>

 

Since this draft is reference by an existing IDR = draft

I=E2=80=99ve included a bit of background below to help you place =  

this draft into the larger context of the SR additions to = BGP-LS

and the = draft-ietf-idr-tunnel-encaps-19.txt.

 

This draft does continue BGP-LS additions.  if = you

are opposed to any BGP-LS additions rather than

this specific addition, please make that clear in = your

comment in this discussion.  

 

The authors requested a WG adoption at IETF 108. 

The IDR co-chairs thank the authors for their patience. =   

This draft has been delayed by process of having a

new document shepherd (Sue Hares) come up to speed

on draft-ietf-idr-tunnel-encapsulation.

 

Cheers, Sue

 

Background

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

Segment Routing technology creates SR tunnels that = are

directly overlaid on MPLS or SRv6.  While existing MPLS = technology

(LDP and RSV-TE) provides mechanisms to negotiate path = MTU

based on individual link MTU limits, the Segment Routing = (SR)

on BGP-LS Link Attribute does not pass information = on

MTU size per link.   

 

draft-ietf-idr-sr-policy-path-mtu-02.txt sends PATH = MTU

information in the tunnel-encapsulation attribute for the tunnel = type  

SR-Policy that handles segment routing (SR) paths. =       

However, it lacks the information to create a = reasonable

Path size since the BGP-LS Link Attribute does = distribute

this information.

 

The draft proposes adding a new sub-TLV for MTU = size

to the BGP-LS Link Attribute TLV, and

draft-ietf-idr-sr-policy-path-mtu-02.txt mentions = this

draft as one possible way to distribute the per = link

MTU.  

 

Questions for the authors might be:

a) Are there ways to pass IGP link MTUs in

the IGPs?  If so, is this needed in BGP-LS

 

b) What other mechanisms pass link MTU? =   

 

 

 

 

 

 

 

_______________________________________________
Idr = mailing list
Idr@ietf.org
https://www.ietf.org/m= ailman/listinfo/idr

------=_NextPart_000_04C2_01D6BBB3.E97F1C10-- From nobody Sun Nov 15 22:10:36 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D81FC3A13C6; Sun, 15 Nov 2020 22:10:33 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: 1.225 X-Spam-Level: * X-Spam-Status: No, score=1.225 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DOS_OUTLOOK_TO_MX=2.845, HTML_MESSAGE=0.001, KHOP_HELO_FCRDNS=0.276, SPF_HELO_NONE=0.001, SPF_NONE=0.001, URIBL_BLOCKED=0.001] autolearn=no autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 1G7cEAZcKJHI; Sun, 15 Nov 2020 22:10:31 -0800 (PST) Received: from hickoryhill-consulting.com (50-245-122-97-static.hfc.comcastbusiness.net [50.245.122.97]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 86CCE3A1451; Sun, 15 Nov 2020 22:09:58 -0800 (PST) X-Default-Received-SPF: pass (skip=loggedin (res=PASS)) x-ip-name=50.107.115.222; From: "Susan Hares" To: "'Jeff Tantsura'" , "'Les Ginsberg \(ginsberg\)'" Cc: "'Ketan Talaulikar \(ketant\)'" , "'Stephane Litkowski \(slitkows\)'" , , "'Acee Lindem \(acee\)'" , References: In-Reply-To: Date: Mon, 16 Nov 2020 01:09:50 -0500 Message-ID: <04e001d6bbdf$198de8c0$4ca9ba40$@ndzh.com> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_04E1_01D6BBB5.30BE2250" X-Mailer: Microsoft Outlook 14.0 Thread-Index: AQHrwD34dgrEDkaLPyIk78lEO0TJ8QF00mJRqZSUvbA= Content-Language: en-us X-Antivirus: AVG (VPS 201115-4, 11/15/2020), Outbound message X-Antivirus-Status: Not-Tested X-Authenticated-User: skh@ndzh.com Archived-At: Subject: Re: [Lsr] [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu (11/1/2020 to 11/16/2020) X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 16 Nov 2020 06:10:34 -0000 This is a multipart message in MIME format. ------=_NextPart_000_04E1_01D6BBB5.30BE2250 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Jeff: =20 I agree your BGP-LS only deployment in the MSD document were not well = defined. =20 =20 Starting a new set of work to define BGP-LS use in BGP-only is = important. If this document start the process to refine how BGP-only = works, this will help defined this usage. I stand by the agreement = that the BGP-LS that exposes the OSPF/ISIS Link MTU proposal can be = adopted in LSR. However, this discussion has confirmed that the BGP-LS = support for BGP-only needs some BGP focus.=20 =20 If there are other drafts on this topic, it would be good to suggest = this drafts on the list. Ketan suggested he had one.=20 =20 Cheers, Sue=20 =20 =20 From: Jeff Tantsura [mailto:jefftant.ietf@gmail.com]=20 Sent: Friday, November 13, 2020 8:52 PM To: Les Ginsberg (ginsberg) Cc: Ketan Talaulikar (ketant); Susan Hares; Stephane Litkowski = (slitkows); idr@ietf.org; Acee Lindem (acee); lsr@ietf.org Subject: Re: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu = (11/1/2020 to 11/16/2020) =20 To add to Les=E2=80=99s point of BGP only scenario, during MSD IESG = reviews, BGP-LS only deployment was found not well characterized and had = been removed from the draft. It will require much better discussion to = have it included. Regards, Jeff On Nov 13, 2020, at 15:57, Les Ginsberg (ginsberg) = wrote: =EF=BB=BF=20 The points which Ketan has made regarding the use of MTU advertisements = defined in RFC 7176 are very valid. Indeed, the contents of the sub-TLV = defined in https://www.rfc-editor.org/rfc/rfc7176.html#section-2.4 = depend upon the TRILL specific MTU-probe/MTU-ack procedures defined in = https://www.rfc-editor.org/rfc/rfc6325#section-4.4.3. These procedures = are not currently applicable to non-TRILL environments. =20 So, there are no existing IGP advertisements defined which can support = the goals of this draft. =20 As Ketan has also indicated, there is no discussion in the draft of how = a BGP only network (for example) could provide the information of = interest. =20 >From my perspective, WG adoption of this draft in ANY WG is premature. This might be a useful functionality to have =E2=80=93 but at the moment = we simply have an idea with no definition of how to implement/deploy it. =20 So I therefore oppose WG adoption of this draft by IDR. =20 Continuing the discussion is certainly useful =E2=80=93 and I would = encourage the current authors to investigate and propose relevant = mechanisms in all the protocols of interest in some future version of = the draft. At that point we could then have a far more meaningful WG adoption call. =20 Les =20 =20 From: Idr On Behalf Of Ketan Talaulikar (ketant) Sent: Friday, November 13, 2020 1:35 AM To: Susan Hares ; 'Jeff Tantsura' = ; 'Stephane Litkowski (slitkows)' = ; idr@ietf.org; 'Acee Lindem = (acee)' Cc: lsr@ietf.org Subject: Re: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu = (11/1/2020 to 11/16/2020) =20 Hi Authors, =20 I believe this work is useful and should be taken up. It has value in = providing the link MTU as part of the topology information via BGP-LS. = However, as pointed out by others on this thread, the draft should = remain scoped to just that =E2=80=93 i.e. providing link MTU = information. The discussion related to Path MTU and applicability to SR = networks are best left outside the scope of this standards track draft. =20 Hi Sue, =20 I would support the points made by Acee for not taking up this draft in = IDR WG and instead doing this in LSR.=20 =20 Besides the missing coverage for OSPFv2/v3, there are also issues with = how this would work with ISIS. The reference to the ISIS Trill = specification points to this TLV = https://tools.ietf.org/html/rfc7176#section-2.4 =E2=80=93 if you see, = there is more here than just the MTU value. What is more critical is the = ISIS procedures (in non-Trill deployments) on how this value is = determined. Please do not mix the following : =20 The MTU sub-TLV is used to optionally announce the MTU of a link as specified in [RFC6325], Section = 4.2.4.4. =20 Are the authors trying to specify that these Trill procedures for = testing MTU need to be adopted for regular ISIS deployments. =20 My take is that while the ISIS TLV defined for Trill may be re-used in = normal ISIS deployments, its usage and procedures need to be specified. = Copying the LSR WG so that I may be corrected if I am wrong here. =20 Coming to the point of BGP-only networks, the draft has zero text = related to that scenario. Moreover, the procedures for BGP-LS = advertisements in BGP only fabric need to be specified as a base. The = https://datatracker.ietf.org/doc/draft-ketant-idr-bgp-ls-bgp-only-fabric/= was my attempt to specify those procedures and it would be great if the = IDR WG could review and provide feedback to this document and consider = for adoption so we can cover the BGP-only networks. =20 I would also like to offer support/help to the authors in adding the = necessary OSPFv2/v3 support for the same in an LSR draft where we could = tackle both the IGPs and BGP-LS encoding and procedures together. =20 Thanks, Ketan =20 From: Idr On Behalf Of Susan Hares Sent: 13 November 2020 00:20 To: 'Jeff Tantsura' ; 'Stephane Litkowski = (slitkows)' ; idr@ietf.org; 'Acee = Lindem (acee)' Subject: Re: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu = (11/1/2020 to 11/16/2020) =20 Jeff and Authors of draft-zhu-idr-bgp-ls-path-mtu:=20 =20 I do believe the authors agreed to renaming the draft. =20 =20 Does the name: draft-xxx-idr-bgp-ls-link-mtu work for=20 the authors and interested IDR participants.=20 =20 As the end of 12 days of the 14 day WG LC, this draft appears=20 to have general consensus from the WG as a useful draft.=20 =20 I plan to allow 2 more days of comment, but at this point=20 it appears the WG wishes to adopt this draft. =20 =20 Here=E2=80=99s my understanding of the best way forward:=20 =20 If LSR adopts a version of the draft, IDR will allow the=20 LSR WG to be the main source as long as cross-working=20 review occurs so the BGP-only function can be reviewed.=20 =20 Please continue to comment on the draft and=20 the planned progression.=20 =20 Cheers, Sue=20 =20 From: Jeff Tantsura [mailto:jefftant.ietf@gmail.com]=20 Sent: Thursday, November 12, 2020 12:53 PM To: Susan Hares; Stephane Litkowski (slitkows); idr@ietf.org; Acee = Lindem (acee) Subject: Re: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu = (11/1/2020 to 11/16/2020) =20 +1 to everything Acee said =20 Cheers,=20 Jeff On Nov 10, 2020, 1:01 PM -0800, Acee Lindem (acee) = , wrote: Speaking as an IDR WG member: =20 The name of the draft is wrong =E2=80=93 the extension is for a Link MTU = and not a path MTU. =20 Speaking as LSR Chair: =20 We could this in LSR as there is currently no MTU advertisement in the = LSAs for OSPFv2 and OSPFv3. Implementations already make use of this = information as it is used in the OSPF DBD packets and for LSA packing. = Of course, we=E2=80=99d require a more accurate draft name and title. =20 Thanks, Acee =20 From: Idr on behalf of Susan Hares = Date: Monday, November 9, 2020 at 4:20 PM To: "'Stephane Litkowski (slitkows)'" = , IDR List Subject: Re: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu = (11/1/2020 to 11/16/2020) =20 Stephane: =20 My second message to this thread asked a few questions about the = technology. =20 =20 This information can be more than IGP information. If SR segments = statically defined (static or direct interfaces) tunnels and pass the = endpoints via BGP tunnel-encaps draft with SR Policy tunnel type, this = can just be BGP. =20 I=E2=80=99ll keep this WG adoption call going until we can be sure if: = 1) it something LSR wants to standardize, and 2) whether there is a BGP = only case. It is clear to me that standardizing MTU for a SR segments = with stacked tunnel segments passed by BGP was useful. =20 The authors should be the ones to propose this in LSR. =20 =20 Cheers, Sue =20 From: Idr [mailto:idr-bounces@ietf.org] On Behalf Of Stephane Litkowski = (slitkows) Sent: Monday, November 9, 2020 4:28 AM To: Susan Hares; idr@ietf.org Subject: Re: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu = (11/1/2020 to 11/16/2020) =20 Hi Sue, =20 > The purpose behind this mechanism is to reduce administrative work = rather than to reduce the review on drafts. =20 That=E2=80=99s exactly my point. If we don=E2=80=99t do OSPF extension = now and in the same draft, we leave a gap that will require a new draft = for a very very small extension. Just adds process overhead for = nothing=E2=80=A6 =20 =20 Stephane =20 =20 From: Susan Hares Sent: lundi 9 novembre 2020 10:10 To: Stephane Litkowski (slitkows) ; idr@ietf.org Subject: RE: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu = (11/1/2020 to 11/16/2020) =20 Stephane: =20 I want to pick up on your email from two points: =20 1) Why not do everything in LSR?=20 If the feature comes with interest in doing all 3 (ISIS, OSPF, and = BGP-LS data gathering), then the authors may select to do everything in = LSR rather than have 2 or 3 drafts to maintain. =20 This is optional and the mechanism may not fit every draft. The drafts = may also start out adopted and vetted in LSR and IDR. The purpose = behind this mechanism is to reduce administrative work rather than to = reduce the review on drafts. =20 =20 =20 2) TRILL implementations of IS-IS has some MTU subTLV -=20 =20 If you are interested in whether this has been implemented in TRILL, you = might want to check with Donald Eastlake. My vague and foggy = recollection is that had some implementations or came from pre-TRILL = implementations. =20 =20 Cheers, Susan Hares =20 =20 =20 From: Stephane Litkowski (slitkows) [mailto:slitkows@cisco.com] Sent: Wednesday, November 4, 2020 3:03 AM To: Susan Hares; idr@ietf.org Subject: RE: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu = (11/1/2020 to 11/16/2020) =20 Hi, =20 =E2=80=9Ca) Are there ways to pass IGP link MTUs in the IGPs? If so, is this needed in BGP-LS=E2=80=9D =20 This is a valid point, most of the time BGP-LS is feeded by IGP LSDBs = (of course there are other ways too). While I see that IS-IS has some = MTU subTLV coming from TRILL RFC7176 (possibly never been implemented), = I don=E2=80=99t see anything for OSPF (I=E2=80=99m not an OSPF expert, = so I may have missed it). Shouldn=E2=80=99t this be checked and validated with LSR WG before = adopting ? =20 =20 Stephane =20 =20 From: Idr On Behalf Of Susan Hares Sent: lundi 2 novembre 2020 06:04 To: idr@ietf.org Subject: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu (11/1/2020 = to 11/16/2020) =20 This begins a 2 week WG adoption call for draft-zhu-idr-bgp-ls-path-mtu-04.txt (11/1 =E2=80=93 11/16/2020). =20 The authors should send in an IPR statement for this draft by 11/5 so the WG can include the IPR status in their decision. =20 You can access the draft at: https://datatracker.ietf.org/doc/draft-zhu-idr-bgp-ls-path-mtu/ =20 Since this draft is reference by an existing IDR draft I=E2=80=99ve included a bit of background below to help you place =20 this draft into the larger context of the SR additions to BGP-LS and the draft-ietf-idr-tunnel-encaps-19.txt. =20 This draft does continue BGP-LS additions. if you=20 are opposed to any BGP-LS additions rather than=20 this specific addition, please make that clear in your=20 comment in this discussion. =20 =20 The authors requested a WG adoption at IETF 108.=20 The IDR co-chairs thank the authors for their patience. =20 This draft has been delayed by process of having a new document shepherd (Sue Hares) come up to speed on draft-ietf-idr-tunnel-encapsulation. =20 Cheers, Sue =20 Background =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D Segment Routing technology creates SR tunnels that are directly overlaid on MPLS or SRv6. While existing MPLS technology (LDP and RSV-TE) provides mechanisms to negotiate path MTU based on individual link MTU limits, the Segment Routing (SR) on BGP-LS Link Attribute does not pass information on MTU size per link. =20 =20 draft-ietf-idr-sr-policy-path-mtu-02.txt sends PATH MTU information in the tunnel-encapsulation attribute for the tunnel type =20 SR-Policy that handles segment routing (SR) paths. =20 However, it lacks the information to create a reasonable Path size since the BGP-LS Link Attribute does distribute this information. =20 The draft proposes adding a new sub-TLV for MTU size to the BGP-LS Link Attribute TLV, and draft-ietf-idr-sr-policy-path-mtu-02.txt mentions this draft as one possible way to distribute the per link MTU. =20 =20 Questions for the authors might be: a) Are there ways to pass IGP link MTUs in the IGPs? If so, is this needed in BGP-LS =20 b) What other mechanisms pass link MTU? =20 =20 =20 =20 =20 =20 =20 =20 _______________________________________________ Idr mailing list Idr@ietf.org https://www.ietf.org/mailman/listinfo/idr ------=_NextPart_000_04E1_01D6BBB5.30BE2250 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable

Jeff:

 

I agree your BGP-LS only deployment in the MSD document were not well = defined. =C2=A0=C2=A0=C2=A0

 

Starting a new set of work to define BGP-LS use in BGP-only is = important.=C2=A0 If this document start the process to refine how = BGP-only works, this will help defined this usage.=C2=A0 =C2=A0I stand = by the agreement that the BGP-LS that exposes the OSPF/ISIS Link MTU = proposal can be adopted in LSR.=C2=A0 However, this discussion has = confirmed that the BGP-LS support for BGP-only needs some BGP focus. =

 

If there are other drafts on this topic, it would be good to suggest = this drafts on the list.=C2=A0=C2=A0 Ketan suggested he had one. =

 

Cheers, Sue

=C2=A0

 

From:= = Jeff Tantsura [mailto:jefftant.ietf@gmail.com]
Sent: Friday, = November 13, 2020 8:52 PM
To: Les Ginsberg = (ginsberg)
Cc: Ketan Talaulikar (ketant); Susan Hares; = Stephane Litkowski (slitkows); idr@ietf.org; Acee Lindem (acee); = lsr@ietf.org
Subject: Re: [Idr] WG Adoption for = draft-zhu-idr-bgp-ls-path-mtu (11/1/2020 to = 11/16/2020)

 

To add to Les=E2=80=99s point of BGP only = scenario, during MSD IESG reviews, BGP-LS only deployment was found not = well characterized and had been removed from the draft. It will require = much better discussion to have it included.

Regards,

Jeff



On Nov 13, 2020, at 15:57, Les Ginsberg = (ginsberg) <ginsberg@cisco.com> = wrote:

=EF=BB=BF =

The points = which Ketan has made regarding the use of MTU advertisements defined in = RFC 7176 are very valid. Indeed, the contents of the sub-TLV defined in = https://= www.rfc-editor.org/rfc/rfc7176.html#section-2.4 depend upon the = TRILL specific MTU-probe/MTU-ack procedures defined in https://www= .rfc-editor.org/rfc/rfc6325#section-4.4.3. These procedures are not = currently applicable to non-TRILL environments.

 

So, there = are no existing IGP advertisements defined which can support the goals = of this draft.

 

As Ketan = has also indicated, there is no discussion in the draft of how a BGP = only network (for example) could provide the information of = interest.

 

From my = perspective, WG adoption of this draft in ANY WG is = premature.

This might = be a useful functionality to have =E2=80=93 but at the moment we simply = have an idea with no definition of how to implement/deploy = it.

 

So I = therefore oppose WG adoption of this draft by = IDR.

 

Continuing = the discussion is certainly useful =E2=80=93 and I would encourage the = current authors to investigate and propose relevant mechanisms in all = the protocols of interest in some future version of the = draft.

At that = point we could then have a far more meaningful WG adoption = call.

 

  = ; Les

 

 

From: Idr = <idr-bounces@ietf.org> On Behalf Of Ketan Talaulikar = (ketant)
Sent: Friday, November 13, 2020 1:35 AM
To: = Susan Hares <shares@ndzh.com>; 'Jeff Tantsura' = <jefftant.ietf@gmail.com>; 'Stephane Litkowski (slitkows)' = <slitkows=3D40cisco.com@dmarc.ietf.org>; idr@ietf.org; 'Acee = Lindem (acee)' <acee=3D40cisco.com@dmarc.ietf.org>
Cc: = lsr@ietf.org
Subject: Re: [Idr] WG Adoption for = draft-zhu-idr-bgp-ls-path-mtu (11/1/2020 to = 11/16/2020)

 

Hi = Authors,

 

I believe = this work is useful and should be taken up. It has value in providing = the link MTU as part of the topology information via BGP-LS. However, as = pointed out by others on this thread, the draft should remain scoped to = just that =E2=80=93 i.e. providing link MTU information. The discussion = related to Path MTU and applicability to SR networks are best left = outside the scope of this standards track draft.

 

Hi = Sue,

 

I would = support the points made by Acee for not taking up this draft in IDR WG = and instead doing this in LSR.

 

Besides = the missing coverage for OSPFv2/v3, there are also issues with how this = would work with ISIS. The reference to the ISIS Trill specification = points to this TLV https://tools.ie= tf.org/html/rfc7176#section-2.4 =E2=80=93 if you see, there is more = here than just the MTU value. What is more critical is the ISIS = procedures (in non-Trill deployments) on how this value is determined. = Please do not mix the following :

 

The MTU = sub-TLV is used to optionally announce the MTU of a link = as

   specified in [RFC6325], = Section 4.2.4.4.

 

Are the = authors trying to specify that these Trill procedures for testing MTU = need to be adopted for regular ISIS deployments.

 

My take is = that while the ISIS TLV defined for Trill may be re-used in normal ISIS = deployments, its usage and procedures need to be specified. Copying the = LSR WG so that I may be corrected if I am wrong = here.

 

Coming to = the point of BGP-only networks, the draft has zero text related to that = scenario. Moreover, the procedures for BGP-LS advertisements in BGP only = fabric need to be specified as a base. The https://datatracker.ietf.org/doc/draft-ketant-idr-bgp-ls-bgp-on= ly-fabric/ was my attempt to specify those procedures and it would = be great if the IDR WG could review and provide feedback to this = document and consider for adoption so we can cover the BGP-only = networks.

 

I would = also like to offer support/help to the authors in adding the necessary = OSPFv2/v3 support for the same in an LSR draft where we could tackle = both the IGPs and BGP-LS encoding and procedures = together.

 

Thanks,

Ketan

 

From: Idr = <idr-bounces@ietf.org> = On Behalf Of Susan Hares
Sent: 13 November 2020 = 00:20
To: 'Jeff Tantsura' <jefftant.ietf@gmail.com>; = 'Stephane Litkowski (slitkows)' <slitkows=3D40cisco.= com@dmarc.ietf.org>; idr@ietf.org; 'Acee Lindem (acee)' = <acee=3D40cisco.com@dmar= c.ietf.org>
Subject: Re: [Idr] WG Adoption for = draft-zhu-idr-bgp-ls-path-mtu (11/1/2020 to = 11/16/2020)

 

Jeff and Authors of draft-zhu-idr-bgp-ls-path-mtu: =

 

I do believe the authors agreed to renaming the draft.  =  

 

Does the name:   draft-xxx-idr-bgp-ls-link-mtu work for =

the authors and interested IDR participants.

 

As the end of 12 days of the 14 day WG LC, this draft appears =

to have general consensus from the WG as a useful draft. =

 

I plan to allow 2 more days of comment, but at this point =

it appears the WG wishes to adopt this draft.  =

 

Here=E2=80=99s my understanding of the best way forward: =

 

If LSR adopts a version of the draft, IDR will allow the =

LSR WG to be the main source as long as cross-working =

review occurs so the BGP-only function can be reviewed. =

 

Please continue to comment on the draft and

the planned progression.

 

Cheers,  Sue

 

From:= = Jeff Tantsura [mailto:jefftant.ietf@gmail.com]
Sent: Thursday, November 12, 2020 12:53 PM
To: = Susan Hares; Stephane Litkowski (slitkows); idr@ietf.org; Acee Lindem = (acee)
Subject: Re: [Idr] WG Adoption for = draft-zhu-idr-bgp-ls-path-mtu (11/1/2020 to = 11/16/2020)

 

+1 to everything = Acee said

 

Cheers, =

Jeff

On Nov 10, 2020, 1:01 PM -0800, Acee = Lindem (acee) <acee=3D40cisco.com@dmar= c.ietf.org>, wrote:

Speaking as = an IDR WG member:

 <= /o:p>

The name of = the draft is wrong =E2=80=93 the extension is for a Link MTU and not a = path MTU.

 <= /o:p>

Speaking as = LSR Chair:

 <= /o:p>

We could = this in LSR as there is currently no MTU advertisement in the LSAs for = OSPFv2 and OSPFv3. Implementations already make use of this information = as it is used in the OSPF DBD packets and for LSA packing. Of course, = we=E2=80=99d require a more accurate draft name and = title.

 <= /o:p>

Thanks,=

Acee

 <= /o:p>

From: Idr <idr-bounces@ietf.org> on = behalf of Susan Hares <shares@ndzh.com>
Date: = Monday, November 9, 2020 at 4:20 PM
To: "'Stephane = Litkowski (slitkows)'" <slitkows=3D40cisco.= com@dmarc.ietf.org>, IDR List <idr@ietf.org>
Subject: Re: = [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu (11/1/2020 to = 11/16/2020)

 

Stephane:

 

My second message to this thread = asked a few questions about the technology.  =  

 

This information can be more than IGP = information.   If SR segments statically defined (static or = direct interfaces) tunnels and pass the endpoints via BGP tunnel-encaps = draft with SR Policy tunnel type, this can just be = BGP.

 

I=E2=80=99ll keep this WG adoption = call going until we can be sure if:  1) it something LSR wants to = standardize, and 2) whether there is a BGP only case.   It is = clear to me that standardizing MTU for a SR segments with stacked tunnel = segments passed by BGP was useful.

 

The authors should be the ones to = propose this in LSR.   =     

 

Cheers, =  Sue

 

From:= Idr [mailto:idr-bounces@ietf.org] = On Behalf Of Stephane Litkowski (slitkows)
Sent: = Monday, November 9, 2020 4:28 AM
To: Susan Hares; idr@ietf.org
Subject: Re: = [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu (11/1/2020 to = 11/16/2020)

 

Hi Sue,

 

> The purpose behind this = mechanism is to reduce administrative work rather than to reduce the = review on drafts.

 

That=E2=80=99s exactly my point. If we don=E2=80=99t do OSPF = extension now and in the same draft, we leave a gap that will require a = new draft for a very very small extension. Just adds process overhead = for nothing=E2=80=A6

 

 

Stephane

 

 

From: Susan Hares <shares@ndzh.com>
Sent: = lundi 9 novembre 2020 10:10
To: Stephane Litkowski (slitkows) = <slitkows@cisco.com>; idr@ietf.org
Subject: RE: = [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu (11/1/2020 to = 11/16/2020)

 

Stephane:

 

I want to pick up on your email from = two points:

 

1)  Why not do everything in = LSR? 

<WG-chair = hat>

If the feature comes with interest in = doing all 3 (ISIS, OSPF, and BGP-LS data gathering), then the authors = may select to do everything in LSR rather than have 2 or 3 drafts to = maintain.

 

This is optional and the mechanism = may not fit every draft.   The drafts may also start out = adopted and vetted in LSR and IDR.    The purpose behind = this mechanism is to reduce administrative work rather than to reduce = the review on drafts.

 

</wg-chair hat = off>

 

 

2) TRILL implementations of = IS-IS has some MTU subTLV - 

 

If you are interested in whether this has been implemented in = TRILL, you might want to check with Donald Eastlake.   My = vague and foggy recollection is that had some implementations or came = from pre-TRILL implementations.

 

 

Cheers, Susan Hares

 

 

 

From:= Stephane = Litkowski (slitkows) [mailto:slitkows@cisco.com]
S= ent: Wednesday, November 4, 2020 3:03 AM
To: Susan Hares; = idr@ietf.org
Subject: RE: = [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu (11/1/2020 to = 11/16/2020)

 

Hi,

 

=E2=80=9Ca) Are there ways to pass IGP link MTUs = in

the IGPs?  If so, is this needed in = BGP-LS=E2=80=9D

 

This is a valid point, most of the time BGP-LS is feeded by IGP = LSDBs (of course there are other ways too). While I see that IS-IS has = some MTU subTLV coming from TRILL RFC7176 (possibly never been = implemented), I don=E2=80=99t see anything for OSPF (I=E2=80=99m not an = OSPF expert, so I may have missed it).

Shouldn=E2=80=99t this be checked and validated with LSR WG before = adopting ?

 

 

Stephane

 

 

From: Idr <idr-bounces@ietf.org> On = Behalf Of Susan Hares
Sent: lundi 2 novembre 2020 = 06:04
To: idr@ietf.org
Subject: [Idr] = WG Adoption for draft-zhu-idr-bgp-ls-path-mtu (11/1/2020 to = 11/16/2020)

 

This begins a 2 week WG adoption call for

draft-zhu-idr-bgp-ls-path-mtu-04.txt (11/1 =E2=80=93 = 11/16/2020).

 

The authors should send in an IPR statement for this = draft

by 11/5 so the WG can include the IPR status in their = decision.

 

You can access the draft at:

= https://datatracker.ietf.org/doc/draft-zhu-idr-bgp-ls-path-mtu/<= /o:p>

 

Since this draft is reference by an existing IDR = draft

I=E2=80=99ve included a bit of background below to help you place =  

this draft into the larger context of the SR additions to = BGP-LS

and the = draft-ietf-idr-tunnel-encaps-19.txt.

 

This draft does continue BGP-LS additions.  if = you

are opposed to any BGP-LS additions rather than

this specific addition, please make that clear in = your

comment in this discussion.  

 

The authors requested a WG adoption at IETF = 108. 

The IDR co-chairs thank the authors for their patience. =   

This draft has been delayed by process of having a

new document shepherd (Sue Hares) come up to speed

on draft-ietf-idr-tunnel-encapsulation.

 

Cheers, Sue

 

Background

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

Segment Routing technology creates SR tunnels that = are

directly overlaid on MPLS or SRv6.  While existing MPLS = technology

(LDP and RSV-TE) provides mechanisms to negotiate path = MTU

based on individual link MTU limits, the Segment Routing = (SR)

on BGP-LS Link Attribute does not pass information = on

MTU size per link.   

 

draft-ietf-idr-sr-policy-path-mtu-02.txt sends PATH = MTU

information in the tunnel-encapsulation attribute for the tunnel = type  

SR-Policy that handles segment routing (SR) paths. =       

However, it lacks the information to create a = reasonable

Path size since the BGP-LS Link Attribute does = distribute

this information.

 

The draft proposes adding a new sub-TLV for MTU = size

to the BGP-LS Link Attribute TLV, and

draft-ietf-idr-sr-policy-path-mtu-02.txt mentions = this

draft as one possible way to distribute the per = link

MTU.  

 

Questions for the authors might be:

a) Are there ways to pass IGP link MTUs in

the IGPs?  If so, is this needed in BGP-LS

 

b) What other mechanisms pass link MTU? =   

 

 

 

 

 

 

 

_______________________________________________
Idr = mailing list
Idr@ietf.org
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15.20.3564.028; Mon, 16 Nov 2020 08:04:12 +0000 From: "Ketan Talaulikar (ketant)" To: Susan Hares , "'Jeff Tantsura'" , "Les Ginsberg (ginsberg)" CC: "Stephane Litkowski (slitkows)" , "idr@ietf.org" , "Acee Lindem (acee)" , "lsr@ietf.org" Thread-Topic: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu (11/1/2020 to 11/16/2020) Thread-Index: AdawzOgQ6Lr8VUABQe2O6Y7iaRDQVwBtAeQAAP3GFQAAAKblAAAY2XSAACcrl4AAaHh0AAACBKCAAB5MTNAAHkls4AAEcDgAAG2U7QAAA8aeQA== Date: Mon, 16 Nov 2020 08:04:12 +0000 Message-ID: References: <04e001d6bbdf$198de8c0$4ca9ba40$@ndzh.com> In-Reply-To: <04e001d6bbdf$198de8c0$4ca9ba40$@ndzh.com> Accept-Language: en-GB, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: ndzh.com; dkim=none (message not signed) header.d=none;ndzh.com; dmarc=none action=none header.from=cisco.com; x-originating-ip: [2405:201:1006:a85b:5da7:1662:f466:12e3] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 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<020d01d6bbc5$9769e7e0$c63db7a0$@tsinghua.org.cn> From: Robert Raszuk Date: Mon, 16 Nov 2020 09:25:24 +0100 Message-ID: To: Aijun Wang Cc: Jeff Tantsura , lsr , "Acee Lindem (acee)" Content-Type: multipart/alternative; boundary="000000000000331d2605b4351fa6" Archived-At: Subject: Re: [Lsr] Prefix Unreachable Announcement Use Cases X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 16 Nov 2020 08:25:37 -0000 --000000000000331d2605b4351fa6 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable > > I was not bringing RIFT's negative routies example as something inherentl= y > negative. I was just pointing it out to illustrate that today's data plan= e > lookup does not really support "if does not match" checks. > > *[WAJ] In data plane, the device do still the =E2=80=9Cmatch=E2=80=9D che= ck, not =E2=80=9Cdoes not > match=E2=80=9D check. When the router receives the PUA information, it w= ill > install one black hole route for a short time.* > So your idea is that you install route for unreachable prefix to /dev/null ? And how would that help connectivity restoration ? Moreover it seems that it will just also prevent any local protection to locally bypass the failed destination. Bottom line is that I agree with one problem statement. However IMHO described actions upon reception of PUA are questionable at best. Cheers, R. --000000000000331d2605b4351fa6 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

I was not bringing RIFT's negative routies example as something in= herently negative. I was just pointing it out to illustrate that today'= s data plane lookup does not really support "if does not match" c= hecks.

= [WAJ] In data plane, the device do still th= e =E2=80=9Cmatch=E2=80=9D check, not =E2=80=9Cdoes not match=E2=80=9D check= .=C2=A0 When the router receives the PUA information, it will install one b= lack hole route for a short time.


So your idea is that you install route fo= r unreachable prefix to /dev/null ?=C2=A0

And how = would that help connectivity restoration ?=C2=A0

M= oreover it seems that it will just also prevent any local protection to loc= ally bypass the failed destination.=C2=A0

Bottom l= ine is that I agree with one problem statement. However IMHO described acti= ons upon reception of PUA are questionable at best.=C2=A0

Cheers,
R.
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[73.63.232.212]) by smtp.gmail.com with ESMTPSA id l20sm9501515pjq.33.2020.11.16.02.35.49 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 16 Nov 2020 02:35:49 -0800 (PST) Content-Type: multipart/alternative; boundary=Apple-Mail-C5A33B63-BC90-42EF-BF4D-E3D755C0E8E0 Content-Transfer-Encoding: 7bit From: Jeff Tantsura Mime-Version: 1.0 (1.0) Date: Mon, 16 Nov 2020 02:35:48 -0800 Message-Id: References: Cc: Aijun Wang , lsr , "Acee Lindem (acee)" In-Reply-To: To: Robert Raszuk X-Mailer: iPhone Mail (18B92) Archived-At: Subject: Re: [Lsr] Prefix Unreachable Announcement Use Cases X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 16 Nov 2020 10:35:52 -0000 --Apple-Mail-C5A33B63-BC90-42EF-BF4D-E3D755C0E8E0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable +1 with Robert. So you expect the following RIB state after PUA has been advertised: 10.0.0.1 - drop 10/24 - forward=20 Unless there=E2=80=99s a recursively discarded next-hop (ala RTBH ) - how d= o you envision it? Regards, Jeff > On Nov 16, 2020, at 00:25, Robert Raszuk wrote: >=20 > =EF=BB=BF >> I was not bringing RIFT's negative routies example as something inherentl= y negative. I was just pointing it out to illustrate that today's data plane= lookup does not really support "if does not match" checks. >>=20 >> [WAJ] In data plane, the device do still the =E2=80=9Cmatch=E2=80=9D chec= k, not =E2=80=9Cdoes not match=E2=80=9D check. When the router receives the= PUA information, it will install one black hole route for a short time. >>=20 >=20 > So your idea is that you install route for unreachable prefix to /dev/null= ?=20 >=20 > And how would that help connectivity restoration ?=20 >=20 > Moreover it seems that it will just also prevent any local protection to l= ocally bypass the failed destination.=20 >=20 > Bottom line is that I agree with one problem statement. However IMHO descr= ibed actions upon reception of PUA are questionable at best.=20 >=20 > Cheers, > R. --Apple-Mail-C5A33B63-BC90-42EF-BF4D-E3D755C0E8E0 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable +1 with Robert.

So you e= xpect the following RIB state after PUA has been advertised:
10.0.= 0.1 - drop
10/24 - forward 

Unless t= here=E2=80=99s a recursively discarded next-hop (ala RTBH )  - how do y= ou envision it?

Regards,
Jeff

On Nov 16, 2020, at 00:25, Robert Ra= szuk <robert@raszuk.net> wrote:

=EF=BB=BF
=

I was not bringing RIFT's negative ro= uties example as something inherently negative. I was just pointing it out t= o illustrate that today's data plane lookup does not really support "if does= not match" checks.

[WAJ] In data plane, the device do= still the =E2=80=9Cmatch=E2=80=9D check, not =E2=80=9Cdoes not match=E2=80=9D= check.  When the router receives the PUA information, it will install o= ne black hole route for a short time.


So your idea is that you install route f= or unreachable prefix to /dev/null ? 

And how w= ould that help connectivity restoration ? 

Mor= eover it seems that it will just also prevent any local protection to locall= y bypass the failed destination. 

Bottom line i= s that I agree with one problem statement. However IMHO described actions up= on reception of PUA are questionable at best. 

Cheers,
R.
= --Apple-Mail-C5A33B63-BC90-42EF-BF4D-E3D755C0E8E0-- From nobody Mon Nov 16 02:38:33 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 593653A03EE; Mon, 16 Nov 2020 02:38:32 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.096 X-Spam-Level: X-Spam-Status: No, score=-2.096 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, MIME_QP_LONG_LINE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id RM4-VMJEW83m; Mon, 16 Nov 2020 02:38:29 -0800 (PST) Received: from mail-pf1-x435.google.com (mail-pf1-x435.google.com [IPv6:2607:f8b0:4864:20::435]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 247843A03C9; Mon, 16 Nov 2020 02:38:29 -0800 (PST) Received: by mail-pf1-x435.google.com with SMTP id 10so13719236pfp.5; Mon, 16 Nov 2020 02:38:29 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=content-transfer-encoding:from:mime-version:subject:date:message-id :references:cc:in-reply-to:to; bh=uEiFL+0xW2bBAyZpnrG87ZgxQ+6FZGcDpJtWjc73WVw=; b=mLBUzyP/AvxyIFYMKOxRkKYR0G8pr5Jpimp7hPOPMH9KuM++fnchwELILk+IhYkpVg tsgToRJGt+wuJYCBckLBxU0OD4uazBHvSSacwiTOlNeqP7aDcPLFXuTLNaONPfRw5VtO ezxyzCYJXEh1xhj+kNfeYce/E3nJfsBPbSU94mAW73fs9rLsPBR8BfTy0Vg3GeZacG7z +sLNFWrmBKp2T0NjB9DHrEGBvtsAr1gLkIARlTpgY6jhVB0qpXUOx+WNM3ssPA7miDjl yc9XpRmWFJgu8qATDtTiW7/3YCOFcsyIZ8ka3ESBnGYJFABFkdIikAvjg5nHXtd7wWZR eSXA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:content-transfer-encoding:from:mime-version :subject:date:message-id:references:cc:in-reply-to:to; bh=uEiFL+0xW2bBAyZpnrG87ZgxQ+6FZGcDpJtWjc73WVw=; b=VhAnpWKe81615K0ELoahRiaD6Q10S20buNKYi6iByuDjzd31KydcVM0EqXRzF1Jh44 0xTsQa548uGeqOx/E9uQ/NEN7RAqNY3+IJAAbXmwQ7rACWC+ahqTUAUb8QmHDNPYwKJ0 XYcuA5P6XMDlYJorbiqQ3JRPhcNBOWsOfRgEedqtqkxpU/wiqBBWoOZA5pP42huBXWP4 dvZRBi+FAyMY03+UppBWOibHLMzxKbNM/O6tbI4EcXDs/WBoJdf+WUdhd35FMkSQuE7f zp2Ob5bQfz916TMK/Gz7hvSphMrOSd3CN4AKySw9oVEdfhKjgSLSsyhQxvde08V0Gpma U/qw== X-Gm-Message-State: AOAM532MR/HyGlE13F9Uu2UQ0zmFp950DgygcUwt+lRMe9SOr4uNlZ5m +Uwy5f2A5HY7Ld19E0+GKN++MXTAcc0= X-Google-Smtp-Source: ABdhPJyMdtjEiNb7GOCwfMFAbyEv/EhluAbDgVoir9sAeYwrEb2Tb5NN/h4dLzTA9przuNnjgGFDQg== X-Received: by 2002:aa7:9707:0:b029:18c:796f:dea4 with SMTP id a7-20020aa797070000b029018c796fdea4mr13568951pfg.66.1605523108010; Mon, 16 Nov 2020 02:38:28 -0800 (PST) Received: from [192.168.1.12] (c-73-63-232-212.hsd1.ca.comcast.net. [73.63.232.212]) by smtp.gmail.com with ESMTPSA id j15sm2046557pjn.35.2020.11.16.02.38.26 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 16 Nov 2020 02:38:27 -0800 (PST) Content-Type: multipart/alternative; boundary=Apple-Mail-3F06CA8A-6968-4762-A4D9-8DD317FDC4B3 Content-Transfer-Encoding: 7bit From: Jeff Tantsura Mime-Version: 1.0 (1.0) Date: Mon, 16 Nov 2020 02:38:25 -0800 Message-Id: References: Cc: Susan Hares , "Les Ginsberg (ginsberg)" , "Stephane Litkowski (slitkows)" , idr@ietf.org, "Acee Lindem (acee)" , lsr@ietf.org In-Reply-To: To: "Ketan Talaulikar (ketant)" X-Mailer: iPhone Mail (18B92) Archived-At: Subject: Re: [Lsr] [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu (11/1/2020 to 11/16/2020) X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 16 Nov 2020 10:38:32 -0000 --Apple-Mail-3F06CA8A-6968-4762-A4D9-8DD317FDC4B3 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Sue, Ketan=E2=80=99s draft would be a great starting point. Regards, Jeff > On Nov 16, 2020, at 00:04, Ketan Talaulikar (ketant) wr= ote: >=20 > =EF=BB=BF > Hi Sue, > =20 > I was referring to https://datatracker.ietf.org/doc/draft-ketant-idr-bgp-l= s-bgp-only-fabric/ > =20 > Seeing the interest in the WG to progress BGP-LS advertisements in BGP-onl= y networks, I would request for the WG to consider adoption of the above dra= ft. I believe the problem statement of the draft is clear and acknowledge th= at it needs updates. So I will leave it to the chairs=E2=80=99 judgement if i= t is in a good enough state for adoption =F0=9F=98=8A > =20 > Thanks, > Ketan > =20 > From: Susan Hares =20 > Sent: 16 November 2020 11:40 > To: 'Jeff Tantsura' ; Les Ginsberg (ginsberg) > Cc: Ketan Talaulikar (ketant) ; Stephane Litkowski (slit= kows) ; idr@ietf.org; Acee Lindem (acee) ; lsr@ietf.org > Subject: RE: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu (11/1/202= 0 to 11/16/2020) > =20 > Jeff: > =20 > I agree your BGP-LS only deployment in the MSD document were not well defi= ned. =20 > =20 > Starting a new set of work to define BGP-LS use in BGP-only is important. = If this document start the process to refine how BGP-only works, this will h= elp defined this usage. I stand by the agreement that the BGP-LS that expo= ses the OSPF/ISIS Link MTU proposal can be adopted in LSR. However, this di= scussion has confirmed that the BGP-LS support for BGP-only needs some BGP f= ocus. > =20 > If there are other drafts on this topic, it would be good to suggest this d= rafts on the list. Ketan suggested he had one. > =20 > Cheers, Sue > =20 > =20 > From: Jeff Tantsura [mailto:jefftant.ietf@gmail.com]=20 > Sent: Friday, November 13, 2020 8:52 PM > To: Les Ginsberg (ginsberg) > Cc: Ketan Talaulikar (ketant); Susan Hares; Stephane Litkowski (slitkows);= idr@ietf.org; Acee Lindem (acee); lsr@ietf.org > Subject: Re: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu (11/1/202= 0 to 11/16/2020) > =20 > To add to Les=E2=80=99s point of BGP only scenario, during MSD IESG review= s, BGP-LS only deployment was found not well characterized and had been remo= ved from the draft. It will require much better discussion to have it includ= ed. >=20 > Regards, > Jeff > =20 >=20 > On Nov 13, 2020, at 15:57, Les Ginsberg (ginsberg) wr= ote: >=20 > =EF=BB=BF > The points which Ketan has made regarding the use of MTU advertisements de= fined in RFC 7176 are very valid. Indeed, the contents of the sub-TLV define= d in https://www.rfc-editor.org/rfc/rfc7176.html#section-2.4 depend upon the= TRILL specific MTU-probe/MTU-ack procedures defined in https://www.rfc-edit= or.org/rfc/rfc6325#section-4.4.3. These procedures are not currently applica= ble to non-TRILL environments. > =20 > So, there are no existing IGP advertisements defined which can support the= goals of this draft. > =20 > As Ketan has also indicated, there is no discussion in the draft of how a B= GP only network (for example) could provide the information of interest. > =20 > =46rom my perspective, WG adoption of this draft in ANY WG is premature. > This might be a useful functionality to have =E2=80=93 but at the moment w= e simply have an idea with no definition of how to implement/deploy it. > =20 > So I therefore oppose WG adoption of this draft by IDR. > =20 > Continuing the discussion is certainly useful =E2=80=93 and I would encour= age the current authors to investigate and propose relevant mechanisms in al= l the protocols of interest in some future version of the draft. > At that point we could then have a far more meaningful WG adoption call. > =20 > Les > =20 > =20 > From: Idr On Behalf Of Ketan Talaulikar (ketant) > Sent: Friday, November 13, 2020 1:35 AM > To: Susan Hares ; 'Jeff Tantsura' ; 'Stephane Litkowski (slitkows)' ;= idr@ietf.org; 'Acee Lindem (acee)' > Cc: lsr@ietf.org > Subject: Re: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu (11/1/202= 0 to 11/16/2020) > =20 > Hi Authors, > =20 > I believe this work is useful and should be taken up. It has value in prov= iding the link MTU as part of the topology information via BGP-LS. However, a= s pointed out by others on this thread, the draft should remain scoped to ju= st that =E2=80=93 i.e. providing link MTU information. The discussion relate= d to Path MTU and applicability to SR networks are best left outside the sco= pe of this standards track draft. > =20 > Hi Sue, > =20 > I would support the points made by Acee for not taking up this draft in ID= R WG and instead doing this in LSR. > =20 > Besides the missing coverage for OSPFv2/v3, there are also issues with how= this would work with ISIS. The reference to the ISIS Trill specification po= ints to this TLV https://tools.ietf.org/html/rfc7176#section-2.4 =E2=80=93 i= f you see, there is more here than just the MTU value. What is more critical= is the ISIS procedures (in non-Trill deployments) on how this value is dete= rmined. Please do not mix the following : > =20 > The MTU sub-TLV is used to optionally announce the MTU of a link as > specified in [RFC6325], Section 4.2.4.4. > =20 > Are the authors trying to specify that these Trill procedures for testing M= TU need to be adopted for regular ISIS deployments. > =20 > My take is that while the ISIS TLV defined for Trill may be re-used in nor= mal ISIS deployments, its usage and procedures need to be specified. Copying= the LSR WG so that I may be corrected if I am wrong here. > =20 > Coming to the point of BGP-only networks, the draft has zero text related t= o that scenario. Moreover, the procedures for BGP-LS advertisements in BGP o= nly fabric need to be specified as a base. The https://datatracker.ietf.org/= doc/draft-ketant-idr-bgp-ls-bgp-only-fabric/ was my attempt to specify those= procedures and it would be great if the IDR WG could review and provide fee= dback to this document and consider for adoption so we can cover the BGP-onl= y networks. > =20 > I would also like to offer support/help to the authors in adding the neces= sary OSPFv2/v3 support for the same in an LSR draft where we could tackle bo= th the IGPs and BGP-LS encoding and procedures together. > =20 > Thanks, > Ketan > =20 > From: Idr On Behalf Of Susan Hares > Sent: 13 November 2020 00:20 > To: 'Jeff Tantsura' ; 'Stephane Litkowski (slitko= ws)' ; idr@ietf.org; 'Acee Lindem (ac= ee)' > Subject: Re: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu (11/1/202= 0 to 11/16/2020) > =20 > Jeff and Authors of draft-zhu-idr-bgp-ls-path-mtu: > =20 > I do believe the authors agreed to renaming the draft. =20 > =20 > Does the name: draft-xxx-idr-bgp-ls-link-mtu work for > the authors and interested IDR participants. > =20 > As the end of 12 days of the 14 day WG LC, this draft appears > to have general consensus from the WG as a useful draft. > =20 > I plan to allow 2 more days of comment, but at this point > it appears the WG wishes to adopt this draft.=20 > =20 > Here=E2=80=99s my understanding of the best way forward: > =20 > If LSR adopts a version of the draft, IDR will allow the > LSR WG to be the main source as long as cross-working > review occurs so the BGP-only function can be reviewed. > =20 > Please continue to comment on the draft and > the planned progression. > =20 > Cheers, Sue > =20 > From: Jeff Tantsura [mailto:jefftant.ietf@gmail.com]=20 > Sent: Thursday, November 12, 2020 12:53 PM > To: Susan Hares; Stephane Litkowski (slitkows); idr@ietf.org; Acee Lindem (= acee) > Subject: Re: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu (11/1/202= 0 to 11/16/2020) > =20 > +1 to everything Acee said > =20 > Cheers, > Jeff > On Nov 10, 2020, 1:01 PM -0800, Acee Lindem (acee) , wrote: >=20 > Speaking as an IDR WG member: > =20 > The name of the draft is wrong =E2=80=93 the extension is for a Link MTU a= nd not a path MTU. > =20 > Speaking as LSR Chair: > =20 > We could this in LSR as there is currently no MTU advertisement in the LSA= s for OSPFv2 and OSPFv3. Implementations already make use of this informatio= n as it is used in the OSPF DBD packets and for LSA packing. Of course, we=E2= =80=99d require a more accurate draft name and title. > =20 > Thanks, > Acee > =20 > From: Idr on behalf of Susan Hares > Date: Monday, November 9, 2020 at 4:20 PM > To: "'Stephane Litkowski (slitkows)'" , IDR List > Subject: Re: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu (11/1/202= 0 to 11/16/2020) > =20 > Stephane: > =20 > My second message to this thread asked a few questions about the technolog= y. =20 > =20 > This information can be more than IGP information. If SR segments static= ally defined (static or direct interfaces) tunnels and pass the endpoints vi= a BGP tunnel-encaps draft with SR Policy tunnel type, this can just be BGP. > =20 > I=E2=80=99ll keep this WG adoption call going until we can be sure if: 1)= it something LSR wants to standardize, and 2) whether there is a BGP only c= ase. It is clear to me that standardizing MTU for a SR segments with stack= ed tunnel segments passed by BGP was useful. > =20 > The authors should be the ones to propose this in LSR. =20 > =20 > Cheers, Sue > =20 > From: Idr [mailto:idr-bounces@ietf.org] On Behalf Of Stephane Litkowski (s= litkows) > Sent: Monday, November 9, 2020 4:28 AM > To: Susan Hares; idr@ietf.org > Subject: Re: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu (11/1/202= 0 to 11/16/2020) > =20 > Hi Sue, > =20 > > The purpose behind this mechanism is to reduce administrative work rathe= r than to reduce the review on drafts. > =20 > That=E2=80=99s exactly my point. If we don=E2=80=99t do OSPF extension now= and in the same draft, we leave a gap that will require a new draft for a v= ery very small extension. Just adds process overhead for nothing=E2=80=A6 > =20 > =20 > Stephane > =20 > =20 > From: Susan Hares > Sent: lundi 9 novembre 2020 10:10 > To: Stephane Litkowski (slitkows) ; idr@ietf.org > Subject: RE: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu (11/1/202= 0 to 11/16/2020) > =20 > Stephane: > =20 > I want to pick up on your email from two points: > =20 > 1) Why not do everything in LSR?=20 > > If the feature comes with interest in doing all 3 (ISIS, OSPF, and BGP-LS d= ata gathering), then the authors may select to do everything in LSR rather t= han have 2 or 3 drafts to maintain. > =20 > This is optional and the mechanism may not fit every draft. The drafts m= ay also start out adopted and vetted in LSR and IDR. The purpose behind t= his mechanism is to reduce administrative work rather than to reduce the rev= iew on drafts. > =20 > > =20 > =20 > 2) TRILL implementations of IS-IS has some MTU subTLV -=20 > =20 > If you are interested in whether this has been implemented in TRILL, you m= ight want to check with Donald Eastlake. My vague and foggy recollection i= s that had some implementations or came from pre-TRILL implementations. > =20 > =20 > Cheers, Susan Hares > =20 > =20 > =20 > From: Stephane Litkowski (slitkows) [mailto:slitkows@cisco.com] > Sent: Wednesday, November 4, 2020 3:03 AM > To: Susan Hares; idr@ietf.org > Subject: RE: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu (11/1/202= 0 to 11/16/2020) > =20 > Hi, > =20 > =E2=80=9Ca) Are there ways to pass IGP link MTUs in > the IGPs? If so, is this needed in BGP-LS=E2=80=9D > =20 > This is a valid point, most of the time BGP-LS is feeded by IGP LSDBs (of c= ourse there are other ways too). While I see that IS-IS has some MTU subTLV c= oming from TRILL RFC7176 (possibly never been implemented), I don=E2=80=99t s= ee anything for OSPF (I=E2=80=99m not an OSPF expert, so I may have missed i= t). > Shouldn=E2=80=99t this be checked and validated with LSR WG before adoptin= g ? > =20 > =20 > Stephane > =20 > =20 > From: Idr On Behalf Of Susan Hares > Sent: lundi 2 novembre 2020 06:04 > To: idr@ietf.org > Subject: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu (11/1/2020 to= 11/16/2020) > =20 > This begins a 2 week WG adoption call for > draft-zhu-idr-bgp-ls-path-mtu-04.txt (11/1 =E2=80=93 11/16/2020). > =20 > The authors should send in an IPR statement for this draft > by 11/5 so the WG can include the IPR status in their decision. > =20 > You can access the draft at: > https://datatracker.ietf.org/doc/draft-zhu-idr-bgp-ls-path-mtu/ > =20 > Since this draft is reference by an existing IDR draft > I=E2=80=99ve included a bit of background below to help you place =20 > this draft into the larger context of the SR additions to BGP-LS > and the draft-ietf-idr-tunnel-encaps-19.txt. > =20 > This draft does continue BGP-LS additions. if you > are opposed to any BGP-LS additions rather than > this specific addition, please make that clear in your > comment in this discussion. =20 > =20 > The authors requested a WG adoption at IETF 108.=20 > The IDR co-chairs thank the authors for their patience. =20 > This draft has been delayed by process of having a > new document shepherd (Sue Hares) come up to speed > on draft-ietf-idr-tunnel-encapsulation. > =20 > Cheers, Sue > =20 > Background > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D > Segment Routing technology creates SR tunnels that are > directly overlaid on MPLS or SRv6. While existing MPLS technology > (LDP and RSV-TE) provides mechanisms to negotiate path MTU > based on individual link MTU limits, the Segment Routing (SR) > on BGP-LS Link Attribute does not pass information on > MTU size per link. =20 > =20 > draft-ietf-idr-sr-policy-path-mtu-02.txt sends PATH MTU > information in the tunnel-encapsulation attribute for the tunnel type =20 > SR-Policy that handles segment routing (SR) paths. =20 > However, it lacks the information to create a reasonable > Path size since the BGP-LS Link Attribute does distribute > this information. > =20 > The draft proposes adding a new sub-TLV for MTU size > to the BGP-LS Link Attribute TLV, and > draft-ietf-idr-sr-policy-path-mtu-02.txt mentions this > draft as one possible way to distribute the per link > MTU. =20 > =20 > Questions for the authors might be: > a) Are there ways to pass IGP link MTUs in > the IGPs? If so, is this needed in BGP-LS > =20 > b) What other mechanisms pass link MTU? =20 > =20 > =20 > =20 > =20 > =20 > =20 > =20 > _______________________________________________ > Idr mailing list > Idr@ietf.org > https://www.ietf.org/mailman/listinfo/idr --Apple-Mail-3F06CA8A-6968-4762-A4D9-8DD317FDC4B3 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable Sue,

Ketan=E2=80=99s dra= ft would be a great starting point.

Regards,
Jef= f

On Nov 16, 2020,= at 00:04, Ketan Talaulikar (ketant) <ketant@cisco.com> wrote:

=
=EF=BB=BF

Hi Sue,<= /p>

 

I was referring to https://datatracker.ietf.org/doc/draft-ketant-idr-bgp-ls-bgp-only-fabric/

 

Seeing the interest in the= WG to progress BGP-LS advertisements in BGP-only networks, I would request f= or the WG to consider adoption of the above draft. I believe the problem statement of the draft is clear and acknowledg= e that it needs updates. So I will leave it to the chairs=E2=80=99 judgement= if it is in a good enough state for adoption =F0=9F=98=8A

 

Thanks,<= /p>

Ketan

 

From: Sus= an Hares <shares@ndzh.com>
Sent: 16 November 2020 11:40
To: 'Jeff Tantsura' <jefftant.ietf@gmail.com>; Les Ginsberg (gi= nsberg) <ginsberg@cisco.com>
Cc: Ketan Talaulikar (ketant) <ketant@cisco.com>; Stephane Litk= owski (slitkows) <slitkows@cisco.com>; idr@ietf.org; Acee Lindem (acee= ) <acee@cisco.com>; lsr@ietf.org
Subject: RE: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu (11/= 1/2020 to 11/16/2020)

 

Jeff:<= /p>

 =

I agree your BGP-LS only= deployment in the MSD document were not well defined.    

 =

Starting a new set of wo= rk to define BGP-LS use in BGP-only is important.  If this document sta= rt the process to refine how BGP-only works, this will help defined this usage.   I stand by the agreement that the= BGP-LS that exposes the OSPF/ISIS Link MTU proposal can be adopted in LSR.&= nbsp; However, this discussion has confirmed that the BGP-LS support for BGP= -only needs some BGP focus.

 =

If there are other draft= s on this topic, it would be good to suggest this drafts on the list. &= nbsp; Ketan suggested he had one.

 =

Cheers, Sue

 =

 =

From: Jeff T= antsura [mailto:jefftant.ietf@gma= il.com]
Sent: Friday, November 13, 2020 8:52 PM
To: Les Ginsberg (ginsberg)
Cc: Ketan Talaulikar (ketant); Susan Hares; Stephane Litkowski (slitk= ows); idr@ietf.org; Acee Lindem (acee); lsr@ietf.org
Subject: Re: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu (11/= 1/2020 to 11/16/2020)

 

T= o add to Les=E2=80=99s point of BGP only scenario, during MSD IESG reviews, B= GP-LS only deployment was found not well characterized and had been removed f= rom the draft. It will require much better discussion to have it included.

Regards,

Jeff

<= o:p> 

O= n Nov 13, 2020, at 15:57, Les Ginsberg (ginsberg) <ginsberg@cisco.com> wrote:

=EF=BB=BF

The points which Ketan has made regard= ing the use of MTU advertisements defined in RFC 7176 are very valid. Indeed= , the contents of the sub-TLV defined in https://= www.rfc-editor.org/rfc/rfc7176.html#section-2.4 depend upon the TRILL sp= ecific MTU-probe/MTU-ack procedures defined in https://www= .rfc-editor.org/rfc/rfc6325#section-4.4.3. These procedures are not curr= ently applicable to non-TRILL environments.=

 

So, there are no existing IGP advertis= ements defined which can support the goals of this draft.

 

As Ketan has also indicated, there is n= o discussion in the draft of how a BGP only network (for example) could prov= ide the information of interest.

 

=46rom my perspective, WG adoption of t= his draft in ANY WG is premature.

This might be a useful functionality t= o have =E2=80=93 but at the moment we simply have an idea with no definition= of how to implement/deploy it.

 

So I therefore oppose WG adoption of t= his draft by IDR.

 

Continuing the discussion is certainly= useful =E2=80=93 and I would encourage the current authors to investigate a= nd propose relevant mechanisms in all the protocols of interest in some future version of the draft.

At that point we could then have a far= more meaningful WG adoption call.

 

   Les

 

 

From: Idr= <idr-bounces@ietf.org> On Behalf Of Ketan Talaulikar (ketant)
Sent: Friday, November 13, 2020 1:35 AM
To: Susan Hares <shares@ndzh.co= m>; 'Jeff Tantsura' <je= fftant.ietf@gmail.com>; 'Stephane Litkowski (slitkows)' <slitkows=3D40cisco.com@dmarc.= ietf.org>; idr@ietf.org; 'Acee Lindem (acee)' <<= a href=3D"mailto:acee=3D40cisco.com@dmarc.ietf.org">acee=3D40cisco.com@dmarc= .ietf.org>
Cc: lsr@ietf.org
Subject: Re: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu (11/= 1/2020 to 11/16/2020)

 

Hi Authors,

 <= /p>

I believe this work is useful and should be taken up.= It has value in providing the link MTU as part of the topology information v= ia BGP-LS. However, as pointed out by others on this thread, the draft should remain scoped to just that =E2=80=93 i.e. p= roviding link MTU information. The discussion related to Path MTU and applic= ability to SR networks are best left outside the scope of this standards tra= ck draft.

 <= /p>

Hi Sue,=

 <= /p>

I would support the points made by Acee for not takin= g up this draft in IDR WG and instead doing this in LSR.

 <= /p>

Besides the missing coverage for OSPFv2/v3, there are= also issues with how this would work with ISIS. The reference to the ISIS T= rill specification points to this TLV https://tools.ie= tf.org/html/rfc7176#section-2.4 =E2=80=93 if you see, there is more here= than just the MTU value. What is more critical is the ISIS procedures (in n= on-Trill deployments) on how this value is determined. Please do not mix the following :

 <= /p>

The MTU sub-TLV is used to optionally announce t= he MTU of a link as

   specified in [RFC6325], S= ection 4.2.4.4.

 <= /p>

Are the authors trying to specify that these Trill pr= ocedures for testing MTU need to be adopted for regular ISIS deployments.

 <= /p>

My take is that while the ISIS TLV defined for Trill m= ay be re-used in normal ISIS deployments, its usage and procedures need to b= e specified. Copying the LSR WG so that I may be corrected if I am wrong here.=

 <= /p>

Coming to the point of BGP-only networks, the draft h= as zero text related to that scenario. Moreover, the procedures for BGP-LS a= dvertisements in BGP only fabric need to be specified as a base. The https://datatracker.ietf.org/doc/draft-ketant-idr-bgp-ls-bgp-only-fabric/ was my attempt to specify those procedures and it would be great if the ID= R WG could review and provide feedback to this document and consider for ado= ption so we can cover the BGP-only networks.

 <= /p>

I would also like to offer support/help to the author= s in adding the necessary OSPFv2/v3 support for the same in an LSR draft whe= re we could tackle both the IGPs and BGP-LS encoding and procedures together.

 <= /p>

Thanks,=

Ketan

 <= /p>

From: Idr= <idr-bounces@ietf.org> On Behalf Of Susan Hares
Sent: 13 November 2020 00:20
To: 'Jeff Tantsura' <je= fftant.ietf@gmail.com>; 'Stephane Litkowski (slitkows)' <slitkows=3D40cisco.com@dmarc.= ietf.org>; idr@ietf.org; 'Acee Lindem (acee)' <<= a href=3D"mailto:acee=3D40cisco.com@dmarc.ietf.org">acee=3D40cisco.com@dmarc= .ietf.org>
Subject: Re: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu (11/= 1/2020 to 11/16/2020)

 

Jeff and Authors of draf= t-zhu-idr-bgp-ls-path-mtu:

 

I do believe the authors= agreed to renaming the draft.   =

 

Does the name: &nbs= p; draft-xxx-idr-bgp-ls-link-mtu work for

the authors and interest= ed IDR participants.

 

As the end of 12 days of= the 14 day WG LC, this draft appears

to have general consensu= s from the WG as a useful draft.

 

I plan to allow 2 more d= ays of comment, but at this point

it appears the WG wishes= to adopt this draft. 

 

Here=E2=80=99s my unders= tanding of the best way forward:

 

If LSR adopts a version o= f the draft, IDR will allow the

LSR WG to be the main so= urce as long as cross-working

review occurs so the BGP= -only function can be reviewed.

 

Please continue to comme= nt on the draft and

the planned progression.=

 

Cheers,  Sue

 

From: Jeff T= antsura [mailto:jefftant.ietf@gma= il.com]
Sent: Thursday, November 12, 2020 12:53 PM
To: Susan Hares; Stephane Litkowski (slitkows); idr@ietf.org; Acee Lindem (acee)
Subject: Re: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu (11/= 1/2020 to 11/16/2020)

 

+1 to everything Acee said<= /o:p>

 

Cheers,

Jeff

O= n Nov 10, 2020, 1:01 PM -0800, Acee Lindem (acee) <acee=3D40cisco.com@dmarc.ietf.org>, wr= ote:

Speaking as an IDR WG member:=

 

The name of the draft is wrong =E2=80=93 the ex= tension is for a Link MTU and not a path MTU.

 

Speaking as LSR Chair:

 

We could this in LSR as there is currently no M= TU advertisement in the LSAs for OSPFv2 and OSPFv3. Implementations already m= ake use of this information as it is used in the OSPF DBD packets and for LSA packing. Of course, we=E2=80=99= d require a more accurate draft name and title.

 

Thanks,

Acee

 

From: Idr <idr-bounces@ietf.org>= on behalf of Susan Hares <shares@ndzh= .com>
Date: Monday, November 9, 2020 at 4:20 PM
To: "'Stephane Litkowski (slitkows)'" <slitkows=3D40cisco.com@dmarc.ietf.org>, I= DR List <idr@ietf.org>
Subject: Re: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu (11/= 1/2020 to 11/16/2020)

 

Stephane:

 

My second message to this threa= d asked a few questions about the technology.   

 

This information can be more th= an IGP information.   If SR segments statically defined (static or= direct interfaces) tunnels and pass the endpoints via BGP tunnel-encaps dra= ft with SR Policy tunnel type, this can just be BGP.

 

I=E2=80=99ll keep this WG adopt= ion call going until we can be sure if:  1) it something LSR wants to s= tandardize, and 2) whether there is a BGP only case.   It is clear= to me that standardizing MTU for a SR segments with stacked tunnel segments passed by BGP was useful.<= /o:p>

 

The authors should be the ones t= o propose this in LSR.       

 

Cheers,  Sue

 

From: Idr [mailto:idr= -bounces@ietf.org] On Behalf Of Stephane Litkowski (slitkows)
Sent: Monday, November 9, 2020 4:28 AM
To: Susan Hares; idr@ietf.org
= Subject: Re: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu (11/= 1/2020 to 11/16/2020)

 

Hi Sue,

 

> The purpose behind t= his mechanism is to reduce administrative work rather than to reduce the rev= iew on drafts.

 

That=E2=80=99s exactly my point. If we don=E2=80=99t do= OSPF extension now and in the same draft, we leave a gap that will require a= new draft for a very very small extension. Just adds process overhead for n= othing=E2=80=A6

 

 

Stephane

 

 

From: Susan Hares &l= t;shares@ndzh.com>
Sent: lundi 9 novembre 2020 10:10
To: Stephane Litkowski (slitkows) <slitkows@cisco.com>; idr@ietf.org
Subject: RE: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu (11/= 1/2020 to 11/16/2020)

 

Stephane:

 

I want to pick up on your email= from two points:

 

1)  Why not do everything i= n LSR? 

<WG-chair hat>

If the feature comes with inter= est in doing all 3 (ISIS, OSPF, and BGP-LS data gathering), then the authors= may select to do everything in LSR rather than have 2 or 3 drafts to mainta= in.

 

This is optional and the mechan= ism may not fit every draft.   The drafts may also start out adopt= ed and vetted in LSR and IDR.    The purpose behind this mech= anism is to reduce administrative work rather than to reduce the review on drafts.

 

</wg-chair hat off>

 

 

2) TRILL implementations of IS-IS has some MTU subTLV - =

 

If you are interested in whether this has been implemen= ted in TRILL, you might want to check with Donald Eastlake.   My v= ague and foggy recollection is that had some implementations or came from pr= e-TRILL implementations.

 

 

Cheers, Susan Hares

 

 

 

From: Stephane Litkowski (slitkows) [mailto:slitkows@cisco.com]
Sent: Wednesday, November 4, 2020 3:03 AM
To: Susan Hares; idr@ietf.org
= Subject: RE: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu (11/= 1/2020 to 11/16/2020)

 

Hi,

 

=E2=80=9Ca) Are there ways to pass IGP link MTUs in

the IGPs?  If so, is this needed in BGP-LS=E2=80=9D=

 

This is a valid point, most of the time BGP-LS is feede= d by IGP LSDBs (of course there are other ways too). While I see that IS-IS h= as some MTU subTLV coming from TRILL RFC7176 (possibly never been implemente= d), I don=E2=80=99t see anything for OSPF (I=E2=80=99m not an OSPF expert, so I may have missed it).

Shouldn=E2=80=99t this be checked and validated with LS= R WG before adopting ?

 

 

Stephane

 

 

From: Idr <idr-bounces@ietf.org> On Behalf Of Susan Hares
Sent: lundi 2 novembre 2020 06:04
To: idr@ietf.org
Subject: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu (11/1/20= 20 to 11/16/2020)

 

This begins a 2 week WG adoption call for

draft-zhu-idr-bgp-ls-path-mtu-04.txt (11/1 =E2=80=93 11= /16/2020).

 

The authors should send in an IPR statement for this dr= aft

by 11/5 so the WG can include the IPR status in their d= ecision.

 

You can access the draft at:

https://datatracker.ietf.org/doc/draft-zhu-idr-bgp-ls-p= ath-mtu/

 

Since this draft is reference by an existing IDR draft<= o:p>

I=E2=80=99ve included a bit of background below to help= you place  

this draft into the larger context of the SR additions t= o BGP-LS

and the draft-ietf-idr-tunnel-encaps-19.txt= .

 

This draft does continue BGP-LS additions.&= nbsp; if you

are opposed to any BGP-LS additions rather t= han

this specific addition, please make that cl= ear in your

comment in this discussion.  

 

The authors requested a WG adoption at IETF 108. <= /span>

The IDR co-chairs thank the authors for their patience.=   

This draft has been delayed by process of having a=

new document shepherd (Sue Hares) come up to speed=

on draft-ietf-idr-tunnel-encapsulation.

 

Cheers, Sue

 

Background

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

=

Segment Routing technology creates SR tunnels that are<= o:p>

directly overlaid on MPLS or SRv6.  While existing= MPLS technology

(LDP and RSV-TE) provides mechanisms to negotiate path M= TU

based on individual link MTU limits, the Segment Routin= g (SR)

on BGP-LS Link Attribute does not pass information on

MTU size per link.   

 

draft-ietf-idr-sr-policy-path-mtu-02.txt sends PATH MTU=

information in the tunnel-encapsulation attribute for t= he tunnel type  

SR-Policy that handles segment routing (SR) paths. &nbs= p;     

However, it lacks the information to create a reasonabl= e

Path size since the BGP-LS Link Attribute does distribu= te

this information.

 

The draft proposes adding a new sub-TLV for MTU size

to the BGP-LS Link Attribute TLV, and=

draft-ietf-idr-sr-policy-path-mtu-02.txt mentions this<= o:p>

draft as one possible way to distribute the per link

MTU.  

 

Questions for the authors might be:

a) Are there ways to pass IGP link MTUs in

the IGPs?  If so, is this needed in BGP-LS

 

b) What other mechanisms pass link MTU?   

 

 

 

 

 

 

 

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= --Apple-Mail-3F06CA8A-6968-4762-A4D9-8DD317FDC4B3-- From nobody Mon Nov 16 06:00:33 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5044F3A1009; Mon, 16 Nov 2020 06:00:27 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.087 X-Spam-Level: X-Spam-Status: No, score=-2.087 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_REMOTE_IMAGE=0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Ll6Ebu3vHmYu; Mon, 16 Nov 2020 06:00:23 -0800 (PST) Received: from mail-pl1-x62d.google.com (mail-pl1-x62d.google.com [IPv6:2607:f8b0:4864:20::62d]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id A54993A1007; Mon, 16 Nov 2020 06:00:23 -0800 (PST) Received: by mail-pl1-x62d.google.com with SMTP id 35so4266483ple.12; Mon, 16 Nov 2020 06:00:23 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=sO2icbvAC7Wiks+7G1/4DEHP9LcuXhaitXH9u6uJ5O4=; b=YtbnY/WH4Lg0Rr500pt8zorHvDjTuwg7K2xYq7bFrHT78Tn5FFk0C4ExcYUgMuEhrr RaYjdiRuEvq4nlV0jWl/Joe55jZ3YIcN0D9h0kAuq21xm+xaaKGN7R9wKifl7269U/Ku u9RAnJHxMPA5cK/4RW5y31l9uoy9+DondNsTtRk6JEeXMfPwM9xq5nXmsPKefyRtK7Z+ w7uZdD8iBiEWw8qfySEZu2lQMvG1CxCGHQCjKiE7xylrwA2AP/GEWoT4m3GFM8/AXah7 qwWAvNTV7SrlRI9R35j30fqHzfMd9pVShnVDwlF87Qqza2WMI+Or8qm502Xc0SIB22ct x6VQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=sO2icbvAC7Wiks+7G1/4DEHP9LcuXhaitXH9u6uJ5O4=; b=L9ApW7nJ59xyOAFmPovPLh1JbuMHkNk/CSkqnEFeNmAx8DUBV/aQyABs7RS8zBJscE s0bgk6Q7V2x/2eJb09+ogNNMuKxuOC5kQD2zti4JphidwQVRbz+AqzxM8U7sLoU1EHHd roehu14kuSR8y4DBT9K9OlsTEpcxx6U2nu6KpW6b4dBypogU32z6/A2CJHK98UdncOL+ zbmYqEGkl+Pmf8QV/UttNz0cneELvGXmLYhdZpcKTgG5gp7p2pbBJihyTlwziap6Avc2 HfsrNoAx4wHTb9jO0Xl2zcb14nmMKBG8mSvyDOjF8r8h+w5G+oKgTA5NtQoDP6jbv6vn d+0g== X-Gm-Message-State: AOAM532Fk7JrkEKiYCcsu5cqvdYPnEM8IQkRC21JqOSSvkQR4uexata8 Ke27BiiJwkWbi1BvWjPXyR5cxgpXxUvml/6WCPA= X-Google-Smtp-Source: ABdhPJx48mtk31YqAbidVPIaUl8WJOvqgirdX+H5fGfGZXJaT7TOgbPKGMgX6+EmlL4x55fDcSczfmT/Ac2hy2Lf0Es= X-Received: by 2002:a17:902:6a84:b029:d8:c8a9:e04d with SMTP id n4-20020a1709026a84b02900d8c8a9e04dmr13481987plk.74.1605535221474; Mon, 16 Nov 2020 06:00:21 -0800 (PST) MIME-Version: 1.0 References: In-Reply-To: From: Gyan Mishra Date: Mon, 16 Nov 2020 09:00:09 -0500 Message-ID: To: Jeff Tantsura Cc: "Acee Lindem (acee)" , "Ketan Talaulikar (ketant)" , "Les Ginsberg (ginsberg)" , "Stephane Litkowski (slitkows)" , Susan Hares , idr@ietf.org, lsr@ietf.org Content-Type: multipart/alternative; boundary="0000000000008cea0305b439cc96" Archived-At: Subject: Re: [Lsr] [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu (11/1/2020 to 11/16/2020) X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 16 Nov 2020 14:00:27 -0000 --0000000000008cea0305b439cc96 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable I support WG adoption and agree Ketan=E2=80=99s doc is good start. On Mon, Nov 16, 2020 at 5:38 AM Jeff Tantsura wrote: > Sue, > > Ketan=E2=80=99s draft would be a great starting point. > > Regards, > Jeff > > On Nov 16, 2020, at 00:04, Ketan Talaulikar (ketant) > wrote: > > =EF=BB=BF > > Hi Sue, > > > > I was referring to > https://datatracker.ietf.org/doc/draft-ketant-idr-bgp-ls-bgp-only-fabric/ > > > > Seeing the interest in the WG to progress BGP-LS advertisements in > BGP-only networks, I would request for the WG to consider adoption of the > above draft. I believe the problem statement of the draft is clear and > acknowledge that it needs updates. So I will leave it to the chairs=E2=80= =99 > judgement if it is in a good enough state for adoption =F0=9F=98=8A > > > > Thanks, > > Ketan > > > > *From:* Susan Hares > *Sent:* 16 November 2020 11:40 > *To:* 'Jeff Tantsura' ; Les Ginsberg (ginsberg) = < > ginsberg@cisco.com> > *Cc:* Ketan Talaulikar (ketant) ; Stephane Litkowski > (slitkows) ; idr@ietf.org; Acee Lindem (acee) < > acee@cisco.com>; lsr@ietf.org > *Subject:* RE: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu > (11/1/2020 to 11/16/2020) > > > > Jeff: > > > > I agree your BGP-LS only deployment in the MSD document were not well > defined. > > > > Starting a new set of work to define BGP-LS use in BGP-only is important. > If this document start the process to refine how BGP-only works, this wil= l > help defined this usage. I stand by the agreement that the BGP-LS that > exposes the OSPF/ISIS Link MTU proposal can be adopted in LSR. However, > this discussion has confirmed that the BGP-LS support for BGP-only needs > some BGP focus. > > > > If there are other drafts on this topic, it would be good to suggest this > drafts on the list. Ketan suggested he had one. > > > > Cheers, Sue > > > > > > *From:* Jeff Tantsura [mailto:jefftant.ietf@gmail.com > ] > *Sent:* Friday, November 13, 2020 8:52 PM > *To:* Les Ginsberg (ginsberg) > *Cc:* Ketan Talaulikar (ketant); Susan Hares; Stephane Litkowski > (slitkows); idr@ietf.org; Acee Lindem (acee); lsr@ietf.org > *Subject:* Re: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu > (11/1/2020 to 11/16/2020) > > > > To add to Les=E2=80=99s point of BGP only scenario, during MSD IESG revie= ws, > BGP-LS only deployment was found not well characterized and had been > removed from the draft. It will require much better discussion to have it > included. > > Regards, > > Jeff > > > > On Nov 13, 2020, at 15:57, Les Ginsberg (ginsberg) > wrote: > > =EF=BB=BF > > The points which Ketan has made regarding the use of MTU advertisements > defined in RFC 7176 are very valid. Indeed, the contents of the sub-TLV > defined in https://www.rfc-editor.org/rfc/rfc7176.html#section-2.4 depend > upon the TRILL specific MTU-probe/MTU-ack procedures defined in > https://www.rfc-editor.org/rfc/rfc6325#section-4.4.3. These procedures > are not currently applicable to non-TRILL environments. > > > > So, there are no existing IGP advertisements defined which can support th= e > goals of this draft. > > > > As Ketan has also indicated, there is no discussion in the draft of how a > BGP only network (for example) could provide the information of interest. > > > > From my perspective, WG adoption of this draft in ANY WG is premature. > > This might be a useful functionality to have =E2=80=93 but at the moment = we simply > have an idea with no definition of how to implement/deploy it. > > > > So I therefore oppose WG adoption of this draft by IDR. > > > > Continuing the discussion is certainly useful =E2=80=93 and I would encou= rage the > current authors to investigate and propose relevant mechanisms in all the > protocols of interest in some future version of the draft. > > At that point we could then have a far more meaningful WG adoption call. > > > > Les > > > > > > *From:* Idr *On Behalf Of *Ketan Talaulikar > (ketant) > *Sent:* Friday, November 13, 2020 1:35 AM > *To:* Susan Hares ; 'Jeff Tantsura' < > jefftant.ietf@gmail.com>; 'Stephane Litkowski (slitkows)' < > slitkows=3D40cisco.com@dmarc.ietf.org>; idr@ietf.org; 'Acee Lindem (acee)= ' < > acee=3D40cisco.com@dmarc.ietf.org> > *Cc:* lsr@ietf.org > *Subject:* Re: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu > (11/1/2020 to 11/16/2020) > > > > Hi Authors, > > > > I believe this work is useful and should be taken up. It has value in > providing the link MTU as part of the topology information via BGP-LS. > However, as pointed out by others on this thread, the draft should remain > scoped to just that =E2=80=93 i.e. providing link MTU information. The di= scussion > related to Path MTU and applicability to SR networks are best left outsid= e > the scope of this standards track draft. > > > > Hi Sue, > > > > I would support the points made by Acee for not taking up this draft in > IDR WG and instead doing this in LSR. > > > > Besides the missing coverage for OSPFv2/v3, there are also issues with ho= w > this would work with ISIS. The reference to the ISIS Trill specification > points to this TLV https://tools.ietf.org/html/rfc7176#section-2.4 =E2=80= =93 if > you see, there is more here than just the MTU value. What is more critica= l > is the ISIS procedures (in non-Trill deployments) on how this value is > determined. Please do not mix the following : > > > > The MTU sub-TLV is used to optionally announce the MTU of a link as > > specified in [RFC6325], Section 4.2.4.4 > . > > > > Are the authors trying to specify that these Trill procedures for testing > MTU need to be adopted for regular ISIS deployments. > > > > My take is that while the ISIS TLV defined for Trill may be re-used in > normal ISIS deployments, its usage and procedures need to be specified. > Copying the LSR WG so that I may be corrected if I am wrong here. > > > > Coming to the point of BGP-only networks, the draft has zero text related > to that scenario. Moreover, the procedures for BGP-LS advertisements in B= GP > only fabric need to be specified as a base. The > https://datatracker.ietf.org/doc/draft-ketant-idr-bgp-ls-bgp-only-fabric/ > was my attempt to specify those procedures and it would be great if the I= DR > WG could review and provide feedback to this document and consider for > adoption so we can cover the BGP-only networks. > > > > I would also like to offer support/help to the authors in adding the > necessary OSPFv2/v3 support for the same in an LSR draft where we could > tackle both the IGPs and BGP-LS encoding and procedures together. > > > > Thanks, > > Ketan > > > > *From:* Idr *On Behalf Of *Susan Hares > *Sent:* 13 November 2020 00:20 > *To:* 'Jeff Tantsura' ; 'Stephane Litkowski > (slitkows)' ; idr@ietf.org; 'Acee > Lindem (acee)' > *Subject:* Re: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu > (11/1/2020 to 11/16/2020) > > > > Jeff and Authors of draft-zhu-idr-bgp-ls-path-mtu: > > > > I do believe the authors agreed to renaming the draft. > > > > Does the name: draft-xxx-idr-bgp-ls-link-mtu work for > > the authors and interested IDR participants. > > > > As the end of 12 days of the 14 day WG LC, this draft appears > > to have general consensus from the WG as a useful draft. > > > > I plan to allow 2 more days of comment, but at this point > > it appears the WG wishes to adopt this draft. > > > > Here=E2=80=99s my understanding of the best way forward: > > > > If LSR adopts a version of the draft, IDR will allow the > > LSR WG to be the main source as long as cross-working > > review occurs so the BGP-only function can be reviewed. > > > > Please continue to comment on the draft and > > the planned progression. > > > > Cheers, Sue > > > > *From:* Jeff Tantsura [mailto:jefftant.ietf@gmail.com > ] > *Sent:* Thursday, November 12, 2020 12:53 PM > *To:* Susan Hares; Stephane Litkowski (slitkows); idr@ietf.org; Acee > Lindem (acee) > *Subject:* Re: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu > (11/1/2020 to 11/16/2020) > > > > +1 to everything Acee said > > > > Cheers, > > Jeff > > On Nov 10, 2020, 1:01 PM -0800, Acee Lindem (acee) < > acee=3D40cisco.com@dmarc.ietf.org>, wrote: > > Speaking as an IDR WG member: > > > > The name of the draft is wrong =E2=80=93 the extension is for a Link MTU = and not a > path MTU. > > > > Speaking as LSR Chair: > > > > We could this in LSR as there is currently no MTU advertisement in the > LSAs for OSPFv2 and OSPFv3. Implementations already make use of this > information as it is used in the OSPF DBD packets and for LSA packing. Of > course, we=E2=80=99d require a more accurate draft name and title. > > > > Thanks, > > Acee > > > > *From:* Idr on behalf of Susan Hares < > shares@ndzh.com> > *Date:* Monday, November 9, 2020 at 4:20 PM > *To:* "'Stephane Litkowski (slitkows)'" < > slitkows=3D40cisco.com@dmarc.ietf.org>, IDR List > *Subject:* Re: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu > (11/1/2020 to 11/16/2020) > > > > Stephane: > > > > My second message to this thread asked a few questions about the > technology. > > > > This information can be more than IGP information. If SR segments > statically defined (static or direct interfaces) tunnels and pass the > endpoints via BGP tunnel-encaps draft with SR Policy tunnel type, this ca= n > just be BGP. > > > > I=E2=80=99ll keep this WG adoption call going until we can be sure if: 1= ) it > something LSR wants to standardize, and 2) whether there is a BGP only > case. It is clear to me that standardizing MTU for a SR segments with > stacked tunnel segments passed by BGP was useful. > > > > The authors should be the ones to propose this in LSR. > > > > Cheers, Sue > > > > *From:* Idr [mailto:idr-bounces@ietf.org ] *On > Behalf Of* Stephane Litkowski (slitkows) > *Sent:* Monday, November 9, 2020 4:28 AM > *To:* Susan Hares; idr@ietf.org > *Subject:* Re: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu > (11/1/2020 to 11/16/2020) > > > > Hi Sue, > > > > > The purpose behind this mechanism is to reduce administrative work > rather than to reduce the review on drafts. > > > > That=E2=80=99s exactly my point. If we don=E2=80=99t do OSPF extension no= w and in the same > draft, we leave a gap that will require a new draft for a very very small > extension. Just adds process overhead for nothing=E2=80=A6 > > > > > > Stephane > > > > > > *From:* Susan Hares > *Sent:* lundi 9 novembre 2020 10:10 > *To:* Stephane Litkowski (slitkows) ; idr@ietf.org > *Subject:* RE: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu > (11/1/2020 to 11/16/2020) > > > > Stephane: > > > > I want to pick up on your email from two points: > > > > 1) Why not do everything in LSR? > > > > If the feature comes with interest in doing all 3 (ISIS, OSPF, and BGP-LS > data gathering), then the authors may select to do everything in LSR rath= er > than have 2 or 3 drafts to maintain. > > > > This is optional and the mechanism may not fit every draft. The drafts > may also start out adopted and vetted in LSR and IDR. The purpose behi= nd > this mechanism is to reduce administrative work rather than to reduce the > review on drafts. > > > > > > > > > > 2) TRILL implementations of IS-IS has some MTU subTLV - > > > > If you are interested in whether this has been implemented in TRILL, you > might want to check with Donald Eastlake. My vague and foggy recollecti= on > is that had some implementations or came from pre-TRILL implementations. > > > > > > Cheers, Susan Hares > > > > > > > > *From:* Stephane Litkowski (slitkows) [mailto:slitkows@cisco.com > ] > *Sent:* Wednesday, November 4, 2020 3:03 AM > *To:* Susan Hares; idr@ietf.org > *Subject:* RE: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu > (11/1/2020 to 11/16/2020) > > > > Hi, > > > > =E2=80=9Ca) Are there ways to pass IGP link MTUs in > > the IGPs? If so, is this needed in BGP-LS=E2=80=9D > > > > This is a valid point, most of the time BGP-LS is feeded by IGP LSDBs (of > course there are other ways too). While I see that IS-IS has some MTU > subTLV coming from TRILL RFC7176 (possibly never been implemented), I don= =E2=80=99t > see anything for OSPF (I=E2=80=99m not an OSPF expert, so I may have miss= ed it). > > Shouldn=E2=80=99t this be checked and validated with LSR WG before adopti= ng ? > > > > > > Stephane > > > > > > *From:* Idr *On Behalf Of* Susan Hares > *Sent:* lundi 2 novembre 2020 06:04 > *To:* idr@ietf.org > *Subject:* [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu (11/1/2020 > to 11/16/2020) > > > > This begins a 2 week WG adoption call for > > draft-zhu-idr-bgp-ls-path-mtu-04.txt (11/1 =E2=80=93 11/16/2020). > > > > The authors should send in an IPR statement for this draft > > by 11/5 so the WG can include the IPR status in their decision. > > > > You can access the draft at: > > https://datatracker.ietf.org/doc/draft-zhu-idr-bgp-ls-path-mtu/ > > > > Since this draft is reference by an existing IDR draft > > I=E2=80=99ve included a bit of background below to help you place > > this draft into the larger context of the SR additions to BGP-LS > > and the draft-ietf-idr-tunnel-encaps-19.txt. > > > > This draft does continue BGP-LS additions. if you > > are opposed to any BGP-LS additions rather than > > this specific addition, please make that clear in your > > comment in this discussion. > > > > The authors requested a WG adoption at IETF 108. > > The IDR co-chairs thank the authors for their patience. > > This draft has been delayed by process of having a > > new document shepherd (Sue Hares) come up to speed > > on draft-ietf-idr-tunnel-encapsulation. > > > > Cheers, Sue > > > > Background > > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D > > Segment Routing technology creates SR tunnels that are > > directly overlaid on MPLS or SRv6. While existing MPLS technology > > (LDP and RSV-TE) provides mechanisms to negotiate path MTU > > based on individual link MTU limits, the Segment Routing (SR) > > on BGP-LS Link Attribute does not pass information on > > MTU size per link. > > > > draft-ietf-idr-sr-policy-path-mtu-02.txt sends PATH MTU > > information in the tunnel-encapsulation attribute for the tunnel type > > SR-Policy that handles segment routing (SR) paths. > > However, it lacks the information to create a reasonable > > Path size since the BGP-LS Link Attribute does distribute > > this information. > > > > The draft proposes adding a new sub-TLV for MTU size > > to the BGP-LS Link Attribute TLV, and > > draft-ietf-idr-sr-policy-path-mtu-02.txt mentions this > > draft as one possible way to distribute the per link > > MTU. > > > > Questions for the authors might be: > > a) Are there ways to pass IGP link MTUs in > > the IGPs? If so, is this needed in BGP-LS > > > > b) What other mechanisms pass link MTU? > > > > > > > > > > > > > > > > _______________________________________________ > Idr mailing list > Idr@ietf.org > https://www.ietf.org/mailman/listinfo/idr > > _______________________________________________ > Lsr mailing list > Lsr@ietf.org > https://www.ietf.org/mailman/listinfo/lsr > --=20 *Gyan Mishra* *Network Solutions A**rchitect * *M 301 502-134713101 Columbia Pike *Silver Spring, MD --0000000000008cea0305b439cc96 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
=C2=A0I support WG adoption and agree Ketan=E2=80=99s doc= is good start.

On Mon, Nov 16, 2020 at 5:38 AM Jeff Tantsura <jefftant.ietf@gmail.com> wrote= :
Sue,

Ketan=E2=80=99s draft would be a great starting point.

Regards,
Jeff

On Nov 16, 2020, at 00:04, Ketan Talaulikar (ketant) <ketant@cisco.com> = wrote:

=EF=BB=BF

Hi Sue,

=C2=A0

I was referring to https://datatracker.ietf.org/doc/draft-ketant-idr-bgp-ls-bgp-only-fabric/

=C2=A0

Seeing the interest in the WG to progress BGP-LS ad= vertisements in BGP-only networks, I would request for the WG to consider a= doption of the above draft. I believe the problem statement of the draft is clear and acknowled= ge that it needs updates. So I will leave it to the chairs=E2=80=99 judgeme= nt if it is in a good enough state for adoption =F0=9F=98=8A

=C2=A0

Thanks,

Ketan

=C2=A0

From: = Susan Hares <shares= @ndzh.com>
Sent: 16 November 2020 11:40
To: 'Jeff Tantsura' <jefftant.ietf@gmail.com>; Les Ginsberg (gin= sberg) <ginsberg= @cisco.com>
Cc: Ketan Talaulikar (ketant) <ketant@cisco.com>; Stephane Litkowski (slitkows)= <slitkows@cisco= .com>; idr@ietf.or= g; Acee Lindem (acee) <acee@cisco.com>; lsr@ietf.org
Subject: RE: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu (11= /1/2020 to 11/16/2020)

=C2=A0

Jeff:

=C2=A0

I agree your BGP-LS on= ly deployment in the MSD document were not well defined. =C2=A0=C2=A0=C2=A0=

=C2=A0

Starting a new set of = work to define BGP-LS use in BGP-only is important.=C2=A0 If this document = start the process to refine how BGP-only works, this will help defined this usage.=C2=A0 =C2=A0I stand by the agreement that th= e BGP-LS that exposes the OSPF/ISIS Link MTU proposal can be adopted in LSR= .=C2=A0 However, this discussion has confirmed that the BGP-LS support for = BGP-only needs some BGP focus.

=C2=A0

If there are other dra= fts on this topic, it would be good to suggest this drafts on the list.=C2= =A0=C2=A0 Ketan suggested he had one.

=C2=A0

Cheers, Sue

=C2=A0

=C2=A0

From: Je= ff Tantsura [m= ailto:jefftant.ietf@gmail.com]
Sent: Friday, November 13, 2020 8:52 PM
To: Les Ginsberg (ginsberg)
Cc: Ketan Talaulikar (ketant); Susan Hares; Stephane Litkowski (slit= kows); idr@ietf.org; Acee Li= ndem (acee); lsr@ietf.org
Subject: Re: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu (11= /1/2020 to 11/16/2020)

=C2=A0

= To add to Les=E2=80=99s point of BGP only scenario, during MSD IESG reviews= , BGP-LS only deployment was found not well characterized and had been remo= ved from the draft. It will require much better discussion to have it included.

Regards,

Jeff

= =C2=A0

= On Nov 13, 2020, at 15:57, Les Ginsberg (ginsberg) <ginsberg@cisco.com> wrote:

=EF=BB=BF

The points which Ketan has made rega= rding the use of MTU advertisements defined in RFC 7176 are very valid. Ind= eed, the contents of the sub-TLV defined in https://www.rfc-editor.org/rfc/rfc7176.html#section-2.4 dep= end upon the TRILL specific MTU-probe/MTU-ack procedures defined in https://www.rfc-editor.org/rfc/rfc6325#section-4.4.3. These pro= cedures are not currently applicable to non-TRILL environments.

=C2=A0

So, there are no existing IGP advert= isements defined which can support the goals of this draft.

=C2=A0

As Ketan has also indicated, there i= s no discussion in the draft of how a BGP only network (for example) could = provide the information of interest.<= /u>

=C2=A0

From my perspective, WG adoption of = this draft in ANY WG is premature.

This might be a useful functionality= to have =E2=80=93 but at the moment we simply have an idea with no definit= ion of how to implement/deploy it.

=C2=A0

So I therefore oppose WG adoption of= this draft by IDR.

=C2=A0

Continuing the discussion is certain= ly useful =E2=80=93 and I would encourage the current authors to investigat= e and propose relevant mechanisms in all the protocols of interest in some future version of the draft.<= u>

At that point we could then have a f= ar more meaningful WG adoption call.<= /u>

=C2=A0

=C2=A0=C2=A0 Les

=C2=A0

=C2=A0

From: = Idr <idr-bounc= es@ietf.org> On Behalf Of Ketan Talaulikar (ketant)
Sent: Friday, November 13, 2020 1:35 AM
To: Susan Hares <shares@ndzh.com>; 'Jeff Tantsura' <jefftant.ietf@gmail.com>= ; 'Stephane Litkowski (slitkows)' <slitkows=3D40cisco.com@dmarc.= ietf.org>; idr@ietf.org; 'Ac= ee Lindem (acee)' <acee=3D40cisco.com@dmarc.ietf.org>
Cc: lsr@ietf.org
Subject: Re: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu (11= /1/2020 to 11/16/2020)

=C2=A0

Hi Authors,

=C2=A0

I believe this work is useful and should be taken u= p. It has value in providing the link MTU as part of the topology informati= on via BGP-LS. However, as pointed out by others on this thread, the draft should remain scoped to just that =E2=80=93 i.e.= providing link MTU information. The discussion related to Path MTU and app= licability to SR networks are best left outside the scope of this standards= track draft.

=C2=A0

Hi Sue,

=C2=A0

I would support the points made by Acee for not tak= ing up this draft in IDR WG and instead doing this in LSR.

=C2=A0

Besides the missing coverage for OSPFv2/v3, there a= re also issues with how this would work with ISIS. The reference to the ISI= S Trill specification points to this TLV https://tools.ietf.org/html/rfc7176#section-2.4 =E2=80=93 if you see= , there is more here than just the MTU value. What is more critical is the = ISIS procedures (in non-Trill deployments) on how this value is determined. Please do not mix the following :

=C2=A0

The MTU sub-TLV is used to optionally announce= the MTU of a link as

=C2=A0=C2=A0 specified in [RFC6325], Section=C2=A04.2.4.4.<= /u>

=C2=A0

Are the authors trying to specify that these Trill = procedures for testing MTU need to be adopted for regular ISIS deployments.=

=C2=A0

My take is that while the ISIS TLV defined for Tril= l may be re-used in normal ISIS deployments, its usage and procedures need = to be specified. Copying the LSR WG so that I may be corrected if I am wrong here.=

=C2=A0

Coming to the point of BGP-only networks, the draft= has zero text related to that scenario. Moreover, the procedures for BGP-L= S advertisements in BGP only fabric need to be specified as a base. The https://datatracker.ietf.org/doc/draft-ketant-idr-bgp-ls-bgp-only-fabric/ was my attempt to specify those procedures and it would be great if the = IDR WG could review and provide feedback to this document and consider for = adoption so we can cover the BGP-only networks.

=C2=A0

I would also like to offer support/help to the auth= ors in adding the necessary OSPFv2/v3 support for the same in an LSR draft = where we could tackle both the IGPs and BGP-LS encoding and procedures together.

=C2=A0

Thanks,

Ketan

=C2=A0

From: = Idr <idr-bounc= es@ietf.org> On Behalf Of Susan Hares
Sent: 13 November 2020 00:20
To: 'Jeff Tantsura' <jefftant.ietf@gmail.com>; 'Stephane Lit= kowski (slitkows)' <slitkows=3D40cisco.com@dmarc.ietf.org>; idr@ietf.org; 'Ac= ee Lindem (acee)' <acee=3D40cisco.com@dmarc.ietf.org>
Subject: Re: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu (11= /1/2020 to 11/16/2020)

=C2=A0

Jeff and Authors of dr= aft-zhu-idr-bgp-ls-path-mtu:

=C2=A0

I do believe the autho= rs agreed to renaming the draft.=C2=A0 =C2=A0

=C2=A0

Does the name:=C2=A0= =C2=A0 draft-xxx-idr-bgp-ls-link-mtu work for

the authors and intere= sted IDR participants.

=C2=A0

As the end of 12 days = of the 14 day WG LC, this draft appears

to have general consen= sus from the WG as a useful draft.

=C2=A0

I plan to allow 2 more= days of comment, but at this point

it appears the WG wish= es to adopt this draft.=C2=A0

=C2=A0

Here=E2=80=99s my unde= rstanding of the best way forward:

=C2=A0

If LSR adopts a versio= n of the draft, IDR will allow the

LSR WG to be the main = source as long as cross-working

review occurs so the B= GP-only function can be reviewed.

=C2=A0

Please continue to com= ment on the draft and

the planned progressio= n.

=C2=A0

Cheers,=C2=A0 Sue

=C2=A0

From: Je= ff Tantsura [m= ailto:jefftant.ietf@gmail.com]
Sent: Thursday, November 12, 2020 12:53 PM
To: Susan Hares; Stephane Litkowski (slitkows); idr@ietf.org; Acee Lindem (acee)
Subject: Re: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu (11= /1/2020 to 11/16/2020)

=C2=A0

+1 to everything Acee said

=C2=A0

Cheers,

Jeff

= On Nov 10, 2020, 1:01 PM -0800, Acee Lindem (acee) <acee=3D40cisco.com@dmarc= .ietf.org>, wrote:

Speaking as an IDR WG member:

=C2=A0

The name of the draft is wrong = =E2=80=93 the extension is for a Link MTU and not a path MTU.=

=C2=A0

Speaking as LSR Chair:

=C2=A0

We could this in LSR as there i= s currently no MTU advertisement in the LSAs for OSPFv2 and OSPFv3. Impleme= ntations already make use of this information as it is used in the OSPF DBD packets and for LSA packing. Of course, we=E2=80= =99d require a more accurate draft name and title.

=C2=A0

Thanks,

Acee

=C2=A0

From: Idr <idr-bounc= es@ietf.org> on behalf of Susan Hares <shares@ndzh.com>
Date: Monday, November 9, 2020 at 4:20 PM
To: "'Stephane Litkowski (slitkows)'" <slitkow= s=3D40cisco.com@dmarc.ietf.org>, IDR List <idr@ietf.org>
Subject: Re: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu (11= /1/2020 to 11/16/2020)

=C2=A0

Stephane:

=C2=A0

My second message to this thre= ad asked a few questions about the technology.=C2=A0 =C2=A0

=C2=A0

This information can be more t= han IGP information.=C2=A0=C2=A0 If SR segments statically defined (static = or direct interfaces) tunnels and pass the endpoints via BGP tunnel-encaps = draft with SR Policy tunnel type, this can just be BGP.

=C2=A0

I=E2=80=99ll keep this WG adop= tion call going until we can be sure if:=C2=A0 1) it something LSR wants to= standardize, and 2) whether there is a BGP only case.=C2=A0 =C2=A0It is cl= ear to me that standardizing MTU for a SR segments with stacked tunnel segments passed by BGP was useful.

=C2=A0

The authors should be the ones= to propose this in LSR.=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0=C2=A0

=C2=A0

Cheers, =C2=A0Sue

=C2=A0

From: Idr [mailto:idr-bounces@ietf.org] On Behalf Of Stephane Litkowski (slitkows)
Sent: Monday, November 9, 2020 4:28 AM
To: Susan Hares; i= dr@ietf.org
Subject: Re: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu (11= /1/2020 to 11/16/2020)

=C2=A0

Hi Sue,<= /p>

=C2=A0

> The purpose behind = this mechanism is to reduce administrative work rather than to reduce the r= eview on drafts.

=C2=A0

That=E2=80=99s exactly my point. If we don=E2=80=99t d= o OSPF extension now and in the same draft, we leave a gap that will requir= e a new draft for a very very small extension. Just adds process overhead f= or nothing=E2=80=A6

=C2=A0

=C2=A0

Stephane

=C2=A0

=C2=A0

From: Susan Hares &= lt;shares@ndzh.com= >
Sent: lundi 9 novembre 2020 10:10
To: Stephane Litkowski (slitkows) <slitkows@cisco.com>; idr@ietf.org
Subject: RE: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu (11= /1/2020 to 11/16/2020)

=C2=A0

Stephane:

=C2=A0

I want to pick up on your emai= l from two points:

=C2=A0

1)=C2=A0 Why not do everything= in LSR?=C2=A0

<WG-chair hat>

If the feature comes with inte= rest in doing all 3 (ISIS, OSPF, and BGP-LS data gathering), then the autho= rs may select to do everything in LSR rather than have 2 or 3 drafts to mai= ntain.

=C2=A0

This is optional and the mecha= nism may not fit every draft. =C2=A0=C2=A0The drafts may also start out ado= pted and vetted in LSR and IDR.=C2=A0=C2=A0 =C2=A0The purpose behind this m= echanism is to reduce administrative work rather than to reduce the review on drafts.

=C2=A0

</wg-chair hat off>

=C2=A0

=C2=A0

2) TRILL implementations of IS-IS has some MTU subTLV -=C2=A0

=C2=A0

If you are interested in whether this has been impleme= nted in TRILL, you might want to check with Donald Eastlake.=C2=A0=C2=A0 My= vague and foggy recollection is that had some implementations or came from= pre-TRILL implementations.

=C2=A0

=C2=A0

Cheers, Susan Hares

=C2=A0

=C2=A0

=C2=A0

From: Stephane Litkowski (slitkows) [mailto:slitkows@cisco.com]
Sent: Wednesday, November 4, 2020 3:03 AM
To: Susan Hares; i= dr@ietf.org
Subject: RE: [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu (11= /1/2020 to 11/16/2020)

=C2=A0

Hi,

=C2=A0

=E2=80=9Ca) Are there ways to pass IGP link MTUs in=

the IGPs?=C2=A0 If so, is this needed in BGP-LS=E2=80= =9D

=C2=A0

This is a valid point, most of the time BGP-LS is feed= ed by IGP LSDBs (of course there are other ways too). While I see that IS-I= S has some MTU subTLV coming from TRILL RFC7176 (possibly never been implem= ented), I don=E2=80=99t see anything for OSPF (I=E2=80=99m not an OSPF expert, so I may have missed it).

Shouldn=E2=80=99t this be checked and validated with L= SR WG before adopting ?

=C2=A0

=C2=A0

Stephane

=C2=A0

=C2=A0

=C2=A0

This begins a 2 week WG adoption call for

draft-zhu-idr-bgp-ls-path-mtu-04.txt (11/1 =E2=80=93 1= 1/16/2020).

=C2=A0

The authors should send in an IPR statement for this d= raft

by 11/5 so the WG can include the IPR status in their = decision.

=C2=A0

You can access the draft at:

https://datatracker.ietf.org/doc/dr= aft-zhu-idr-bgp-ls-path-mtu/

=C2=A0

Since this draft is reference by an existing IDR draft=

I=E2=80=99ve included a bit of background below to hel= p you place =C2=A0

this draft into the larger context of the SR additions= to BGP-LS

and the draft-ietf-idr-tunnel-encaps-19.tx= t.

=C2=A0

This draft does continue BGP-LS additions.= =C2=A0 if you

are opposed to any BGP-LS additions rather= than

this specific addition, please make that c= lear in your

comment in this discussion.=C2=A0=C2=A0=

=C2=A0

The authors requested a WG adoption at IETF 108.=C2=A0=

The IDR co-chairs thank the authors for their patience= . =C2=A0=C2=A0

This draft has been delayed by process of having a<= /u>

new document shepherd (Sue Hares) come up to speed<= /u>

on draft-ietf-idr-tunnel-encapsulation.<= /span>

=C2=A0

Cheers, Sue

=C2=A0

Background

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=

Segment Routing technology creates SR tunnels that are=

directly overlaid on MPLS or SRv6.=C2=A0 While existin= g MPLS technology

(LDP and RSV-TE) provides mechanisms to negotiate path= MTU

based on individual link MTU limits, the Segment Routi= ng (SR)

on BGP-LS Link Attribute does not pass information on<= u>

MTU size per link.=C2=A0 =C2=A0

=C2=A0

draft-ietf-idr-sr-policy-path-mtu-02.txt sends PATH MT= U

information in the tunnel-encapsulation attribute for = the tunnel type =C2=A0

SR-Policy that handles segment routing (SR) paths. =C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0

However, it lacks the information to create a reasonab= le

Path size since the BGP-LS Link Attribute does distrib= ute

this information.

=C2=A0

The draft proposes adding a new sub-TLV for MTU size

to the BGP-LS Link Attribute TLV, and

draft-ietf-idr-sr-policy-path-mtu-02.txt mentions this=

draft as one possible way to distribute the per link

MTU. =C2=A0

=C2=A0

Questions for the authors might be:

a) Are there ways to pass IGP link MTUs in

the IGPs?=C2=A0 If so, is this needed in BGP-LS=

=C2=A0

b) What other mechanisms pass link MTU? =C2=A0=C2=A0

=C2=A0

=C2=A0

=C2=A0

=C2=A0

=C2=A0

=C2=A0

=C2=A0

_______________________________= ________________
Idr mailing list
Idr@ietf.org
htt= ps://www.ietf.org/mailman/listinfo/idr

______________________= _________________________
Lsr mailing list
Lsr@ietf.org
https://www.ietf.org/mailman/listinfo/lsr
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To: Gyan Mishra , Jeff Tantsura CC: "idr@ietf.org" , "Stephane Litkowski (slitkows)" , "lsr@ietf.org" , Susan Hares Thread-Topic: [Idr] [Lsr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu (11/1/2020 to 11/16/2020) Thread-Index: AQHWvCDxLRYMKnlW3E64w8N1foAVa6nKzS3A Date: Mon, 16 Nov 2020 14:15:47 +0000 Message-ID: References: In-Reply-To: Accept-Language: zh-CN, en-US Content-Language: zh-CN X-MS-Has-Attach: yes X-MS-TNEF-Correlator: x-originating-ip: [10.108.243.130] Content-Type: multipart/related; boundary="_004_C7C2E1C43D652C4E9E49FE7517C236CB02CBD404dggeml529mbxchi_"; type="multipart/alternative" MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: Re: [Lsr] [Idr] WG Adoption for draft-zhu-idr-bgp-ls-path-mtu (11/1/2020 to 11/16/2020) X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 16 Nov 2020 14:15:58 -0000 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SFP:1102; x-ms-exchange-antispam-messagedata: =?iso-8859-1?Q?/4S/A7QdWKO1rf2zTGWaOPISynl6MtkxLCs//acmlwA7d9MD6zeeDW92En?= =?iso-8859-1?Q?l6qiSh1OBlRC7nsKML+vv7N4PWkXUq2WMloibdV7CrJh12nNhCc9klSSHd?= =?iso-8859-1?Q?Zkh+WsbHCYBuhC25uVTSnD0Qtvd9im+4z3TylhXKUYuekeMkgVgaVtEQpm?= =?iso-8859-1?Q?f4Qd/tzs/XaYAHt/XQP7rn1ucDzLICeBT3rGa81/LaVpWWoXWZZZcmAko0?= =?iso-8859-1?Q?wt2VhRVpTc0qkJNLWVZA3uEL7nSg63cn14s4T9rnSDcM/zIYK7eEIXMsog?= =?iso-8859-1?Q?3PNwUfnvW6rlNzntIScSjG7BNT6fu8kpSEBfIabQlxVZlI0sZsq5XTsKsm?= =?iso-8859-1?Q?WD3rH7hRNkKVQ4PnZyzGpqYXErYPc43tvrPTzP9ajsR8F/qAYSw9V+KOyf?= =?iso-8859-1?Q?rA/2NXVs18J5swJUmH9irBe7Nslw/Ba9d5CW7xn/YZIZ0wUO05nOFXiO6R?= =?iso-8859-1?Q?Ka2+5zczxvqxAWLUlsc6DrWJo4DsCYu8awNozFi4v0ykpPTBNaTQ1IPoWk?= =?iso-8859-1?Q?XGj+BhlkEUGGvJqdQl5o4ZsKlY7B+TypG7g/o+C2j9XYEHlXVv8tDuwclU?= =?iso-8859-1?Q?7i7iWYB29BzEjpsAk9uBMSg86/7NifzuiMOmaCw4rtup4I1C6leEMFCrn7?= =?iso-8859-1?Q?KqDJ2L9JBoajNzD1THrxo7hrKO+4j2uKYRGqe2gYoObs1wBMPuegc99fz/?= 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X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: gkjdTLw4Bw+ehlKHXQHf0XoE08uq5X44J65rF70roenlAcGk83l4tE+0wd8S2XkiDCrdYX4D7hNLSw2cUhquzQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR13MB3928 Archived-At: Subject: Re: [Lsr] New Version for draft-wang-lsr-hbh-process-00 X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 17 Nov 2020 04:59:25 -0000 --_000_MN2PR13MB40871F3CD1BC0BE44FD47398F2E20MN2PR13MB4087namp_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi Authors, The draft describes extensions to IGP for a node to distribute capabilities of its links. The capability information about all the links in a network may be used by another entity such as a controller. I have following comments: 1). In section 3, the capabilities of a link or a node is represented by "Processing Action" (refer to Fig. 1 in the draft). Why do you include "Max EH Len" in the "Processing Action"? It is not a capability. 2). The text describing the format of "Processing Action" below seems not consistent with the format in Fig. 1. "... processing action formed of a tuple of a 1-octet Extension Header Options identifier and 8-bit Processing Action Flag." The above text occurs twice in the draft. 3). It seems that using word "signal" or "signaling" in the draft is not good. It is better to use another word and rephrase the related text= . Best Regards, Huaimo ________________________________ From: Lsr on behalf of wangyali Sent: Thursday, October 29, 2020 9:19 AM To: lsr@ietf.org Subject: [Lsr] New Version for draft-wang-lsr-hbh-process-00 Hello WG, Considering the Hop-by-Hop Options header has been used for IOAM [I-D.ietf-= ippm-ioam-ipv6-options], Alternate Marking method [I-D.ietf-6man-ipv6-alt-m= ark], etc., but as specified in RFC8200, the Hop-by-Hop Options header is o= nly examined and processed if it is explicitly configured. In this case, no= des may be configured to ignore the Hop-by-Hop Options header, drop packets= containing a Hop-by-Hop Options header, or assign packets containing a Hop= -by-Hop Options header to a slow processing path. Thus, the performance mea= surement does not account for all links and nodes along a path. In addition= , packets carrying a Hop-by-Hop Options header may be dropped, which gravel= y deteriorates network performance. Therefore, we propose a new draft about IGP extensions for signaling Hop-by= -Hop Options header processing action at node and link granularity. Such ad= vertisement is useful for entities (e.g., the centralized controller) to ga= ther each router's processing action for achieving the computation of TE pa= ths that be able to support a specific service encoded in the Hop-by-Hop Op= tions header. Please let us know your opinion. Questions and comments are very welcome. Best regards, Yali -----Original Message----- From: internet-drafts@ietf.org [mailto:internet-drafts@ietf.org] Sent: Thursday, October 29, 2020 8:42 PM To: Tianran Zhou ; Huzhibo ; wa= ngyali Subject: New Version Notification for draft-wang-lsr-hbh-process-00.txt A new version of I-D, draft-wang-lsr-hbh-process-00.txt has been successful= ly submitted by Yali Wang and posted to the IETF repository. Name: draft-wang-lsr-hbh-process Revision: 00 Title: IGP Extensions for Advertising Hop-by-Hop Options Header Pr= ocessing Action Document date: 2020-10-29 Group: Individual Submission Pages: 10 URL: https://nam11.safelinks.protection.outlook.com/?url=3Dhttps= %3A%2F%2Fwww.ietf.org%2Farchive%2Fid%2Fdraft-wang-lsr-hbh-process-00.txt&am= p;data=3D04%7C01%7Chuaimo.chen%40futurewei.com%7C1b6010e28c9345df423708d87c= 0d5f8f%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C1%7C637395744183598793%7CUn= known%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJ= XVCI6Mn0%3D%7C2000&sdata=3DtvJH5rnR%2BAj%2FxTTaxxbKJ6z%2F1OKAog3QdCCJnJ= kKB2I%3D&reserved=3D0 Status: https://nam11.safelinks.protection.outlook.com/?url=3Dhttps= %3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fdraft-wang-lsr-hbh-process%2F&dat= a=3D04%7C01%7Chuaimo.chen%40futurewei.com%7C1b6010e28c9345df423708d87c0d5f8= f%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C1%7C637395744183598793%7CUnknown= %7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6= Mn0%3D%7C2000&sdata=3DWt7W0PL8HGI1EaPK8sV92RWIRGXATD0RGx1AhGIH6xk%3D&am= p;reserved=3D0 Htmlized: https://nam11.safelinks.protection.outlook.com/?url=3Dhttps= %3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fhtml%2Fdraft-wang-lsr-hbh-process&= ;data=3D04%7C01%7Chuaimo.chen%40futurewei.com%7C1b6010e28c9345df423708d87c0= d5f8f%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C1%7C637395744183598793%7CUnk= nown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJX= VCI6Mn0%3D%7C2000&sdata=3DZmi3lDpE2aNulJxCiyU%2B9XQzv63EPeMo%2BAWVkatiD= RE%3D&reserved=3D0 Htmlized: https://nam11.safelinks.protection.outlook.com/?url=3Dhttps= %3A%2F%2Ftools.ietf.org%2Fhtml%2Fdraft-wang-lsr-hbh-process-00&data=3D0= 4%7C01%7Chuaimo.chen%40futurewei.com%7C1b6010e28c9345df423708d87c0d5f8f%7C0= fee8ff2a3b240189c753a1d5591fedc%7C1%7C1%7C637395744183598793%7CUnknown%7CTW= FpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3= D%7C2000&sdata=3Dm9Z1uy3W4tT73SQod1DpcT%2BU4malMI25xQtNHTSwkdY%3D&r= eserved=3D0 Abstract: This document extends Node and Link attribute TLVs to Interior Gateway Protocols (IGP) to advertise the Hop-by-Hop Options header processing action and supported services (e.g. IOAM Trace Option and Alternate Marking) at node and link granularity. Such advertisements allow entities (e.g., centralized controllers) to determine whether the Hop-by-Hop Options header and specific services can be supported in a given network. Please note that it may take a couple of minutes from the time of submissio= n until the htmlized version and diff are available at tools.ietf.org. The IETF Secretariat _______________________________________________ Lsr mailing list Lsr@ietf.org https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fwww.iet= f.org%2Fmailman%2Flistinfo%2Flsr&data=3D04%7C01%7Chuaimo.chen%40futurew= ei.com%7C1b6010e28c9345df423708d87c0d5f8f%7C0fee8ff2a3b240189c753a1d5591fed= c%7C1%7C1%7C637395744183598793%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAi= LCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C2000&sdata=3DFae4vhjYo= 1fN5aIkVTTYMlANFCNyH%2FvxkyznvdjL%2B6U%3D&reserved=3D0 --_000_MN2PR13MB40871F3CD1BC0BE44FD47398F2E20MN2PR13MB4087namp_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Hi Authors,



--

Gyan Mishra

Network Solutions A= rchitect=C2= =A0

M 301 502-1347
13101 Columbia= Pike=C2=A0
Silver Spring, MD


<= /div>
--00000000000051e32d05b448dbf0-- From nobody Tue Nov 17 00:01:25 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id CC0263A00C4 for ; Tue, 17 Nov 2020 00:01:24 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.087 X-Spam-Level: X-Spam-Status: No, score=-2.087 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_REMOTE_IMAGE=0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id J4AISnvZnw7c for ; Tue, 17 Nov 2020 00:01:23 -0800 (PST) Received: from mail-pf1-x429.google.com (mail-pf1-x429.google.com [IPv6:2607:f8b0:4864:20::429]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 31C9F3A0061 for ; Tue, 17 Nov 2020 00:01:07 -0800 (PST) Received: by mail-pf1-x429.google.com with SMTP id t8so491847pfg.8 for ; Tue, 17 Nov 2020 00:01:07 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=kEC4lcRl6vk9WWJ0pqMVrL6Jy3xUlJMh+FcP1SnQkIs=; b=FbZqbJT+H9XfZQH7nhUXO7h1qK2Q0RE4z0b+epWyOwZkP0FYTrLLt7pdl0H0yLbg4Q 8HvdBySddFrtd3aY0ECEnxP12AAuhM8gStqJlNQb4T0nLKE+6y+BtOlXwmFsIR1615yw oArJPzCuXxHImN0phdnfgBfOKirk7St1hotjJSs+YhIsP3rKytEgxlNc6Zs5Hxq58ZTX weiNQ420aiR77HxsVe5KMf9W4At1E0oxPT18+jH4a5bpy9icQp+7r2qHzyTqen0mZZLr 8HMMnz9qIsm3JjZnTt9fzdjmga2C+wf2wSD936waUqh7Lm1YzfdweD8M43aVI6/A20do FEag== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=kEC4lcRl6vk9WWJ0pqMVrL6Jy3xUlJMh+FcP1SnQkIs=; b=CuBQGDUa/R0nqGiUYikj3m+ThL5gKnq7DxB4iBqX86VKXaTe+LT2jTgulmUdPLra4y v2QV3M63HG0zyKAnzLeM9xlwIe73Cbm82/BES+pU4zq9ZA1MVYRiv4xfyVnD2Z3+IrII LQsDIbgldiNo1arwu2fN0xsMwS3JKOVt1Pt0DsyAdKQNiI5fs4EgV37RMLH6crK1jCv8 Xegwz65i4Qsjdsly4/Hd/mVQq78zBgR9xg9lppjwTxwiIgXK/W2wYKRRheXK5k9xHPv2 ga9w98Ht1zpmqLO/7m5cegjYZVBIixF6YgCDdl4BeAJhg/4hAMrThsYFFtHwPBh+59XJ rDXQ== X-Gm-Message-State: AOAM533l+k4YRTjrZ3AHwxWuPrPnG6xQidSl2FCoV47A1L0yrBJqHvIj jqY14nSsNfHTZop0Jx1mw8R4iYzb2Vt3oFIeCWY= X-Google-Smtp-Source: ABdhPJxaVpvK7U+CWduRjE+EAv+u8wT+IGubJe0/sPeo/anegG+JtLpUZe+ifAvClrpnDnR32uT3pKxZJ78ILWGIACM= X-Received: by 2002:a62:ee06:0:b029:164:20d:183b with SMTP id e6-20020a62ee060000b0290164020d183bmr17701995pfi.4.1605600066590; Tue, 17 Nov 2020 00:01:06 -0800 (PST) MIME-Version: 1.0 References: <020d01d6bbc5$9769e7e0$c63db7a0$@tsinghua.org.cn> In-Reply-To: From: Gyan Mishra Date: Tue, 17 Nov 2020 02:54:28 -0500 Message-ID: To: "Acee Lindem (acee)" Cc: Robert Raszuk , Aijun Wang , lsr , Jeff Tantsura Content-Type: multipart/alternative; boundary="0000000000009edc9405b448e58d" Archived-At: Subject: Re: [Lsr] Prefix Unreachable Announcement Use Cases X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 17 Nov 2020 08:01:25 -0000 --0000000000009edc9405b448e58d Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Thanks Acee for the feedback. We will add more detail to the use cases. Gyan On Mon, Nov 16, 2020 at 3:45 AM Acee Lindem (acee) wrote: > When the PUA use cases were presented today in the LSR meeting, I made th= e > comment that the RIB interactions for each use case would be different an= d > needed to be specified. > > Thanks, > > Acee > > > > > > *From: *Robert Raszuk > *Date: *Monday, November 16, 2020 at 3:25 AM > *To: *Aijun Wang > *Cc: *Jeff Tantsura , lsr , Acee > Lindem > *Subject: *Re: [Lsr] Prefix Unreachable Announcement Use Cases > > > > I was not bringing RIFT's negative routies example as something inherentl= y > negative. I was just pointing it out to illustrate that today's data plan= e > lookup does not really support "if does not match" checks. > > *[WAJ] In data plane, the device do still the =E2=80=9Cmatch=E2=80=9D che= ck, not =E2=80=9Cdoes not > match=E2=80=9D check. When the router receives the PUA information, it w= ill > install one black hole route for a short time.* > > > > So your idea is that you install route for unreachable prefix to /dev/nul= l > ? > > > > And how would that help connectivity restoration ? > > > > Moreover it seems that it will just also prevent any local protection to > locally bypass the failed destination. > > > > Bottom line is that I agree with one problem statement. However IMHO > described actions upon reception of PUA are questionable at best. > > > > Cheers, > R. > _______________________________________________ > Lsr mailing list > Lsr@ietf.org > https://www.ietf.org/mailman/listinfo/lsr > --=20 *Gyan Mishra* *Network Solutions A**rchitect * *M 301 502-134713101 Columbia Pike *Silver Spring, MD --0000000000009edc9405b448e58d Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Thanks Acee for the feedback.

We will a= dd more detail to the use cases.

Gyan
<= br>
On Mon,= Nov 16, 2020 at 3:45 AM Acee Lindem (acee) <acee=3D40cisco.com@dmarc.ietf.org> wrote:

When the PUA use cases were presented today in the L= SR meeting, I made the comment that the RIB interactions for each use case = would be different and needed to be specified. =C2=A0

Thanks,

Acee

=C2=A0

=C2=A0

From: Robert Raszuk <robert@raszuk.net&g= t;
Date: Monday, November 16, 2020 at 3:25 AM
To: Aijun Wang <wangaijun@tsinghua.org.cn>
Cc: Jeff Tantsura <jefftant.ietf@gmail.com>, lsr <lsr@ietf.org>, Acee Lindem <acee@cisco.com>
Subject: Re: [Lsr] Prefix Unreachable Announcement Use Cases<= u>

=C2=A0

I was not bringing RIFT's negative routies example as something i= nherently negative. I was just pointing it out to illustrate that today'= ;s data plane lookup does not really support "if does not match" = checks.

[WAJ] In data plane, the device do still the =E2=80=9Cmatch=E2=80=9D check, not =E2=80=9Cdoes not match=E2=80=9D check.= =C2=A0 When the router receives the PUA information, it will install one bl= ack hole route for a short time.<= /p>

=C2=A0

So your idea is that you= install route for unreachable prefix to /dev/null ?=C2=A0

=C2=A0

And how would that help = connectivity restoration ?=C2=A0

=C2=A0

Moreover it seems that i= t will just also prevent any local protection to locally bypass the failed = destination.=C2=A0

=C2=A0

Bottom line is that I ag= ree with one problem statement. However IMHO described actions upon recepti= on of PUA are questionable at best.=C2=A0

=C2=A0

Cheers,
R.

_______________________________________________
Lsr mailing list
Lsr@ietf.org
https://www.ietf.org/mailman/listinfo/lsr


--

Gyan Mishra

Network Solutions A= rchitect=C2= =A0

M 301 502-1347
13101 Columbia= Pike=C2=A0
Silver Spring, MD


<= /div>
--0000000000009edc9405b448e58d-- From nobody Tue Nov 17 00:06:19 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 42B0D3A03F5 for ; Tue, 17 Nov 2020 00:06:18 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.098 X-Spam-Level: X-Spam-Status: No, score=-2.098 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=raszuk.net Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id accuLfHWy5Cv for ; Tue, 17 Nov 2020 00:06:17 -0800 (PST) Received: from mail-lf1-x130.google.com (mail-lf1-x130.google.com [IPv6:2a00:1450:4864:20::130]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id EA1F73A03EC for ; Tue, 17 Nov 2020 00:06:10 -0800 (PST) Received: by mail-lf1-x130.google.com with SMTP id f11so28879441lfs.3 for ; Tue, 17 Nov 2020 00:06:10 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=raszuk.net; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=xut7VzF2U+NUM4Cz+GGNeo1nC1HKhNtmmZUOM+PZow0=; b=Kqyp/P/lVlcEHUFGzPWPVHqa/CXcW97wkhFQf4DEQwu8Wzvb+p4Rwm3XHi+ywPikum SRy1xG4JEsZqrUWHpM5A7sj4oVoc6cRJQuk7Lj2xG+U4E+XUQsaS6kjWyO0aoF02WQ8R rnXkXpuhgV4F0DSD5p3KiWcv1C5nndlN74buJVAqVtMFBJksFBB3bGfUO/CoPo1I/Zqc COvOv+bQ3AwOBSCn3FxoMOzP9wmud6PpUNigzck0D90KD66NTb28yvxDmXMnOH0y+evi zAbBAR2VHmu6sukaSSRZQ3vroGTKa7C3By+4r8hgGwv3YKjJks85NEd788OngFw2caAt ftZA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=xut7VzF2U+NUM4Cz+GGNeo1nC1HKhNtmmZUOM+PZow0=; b=jqEN4V+Fh3T9/QnIIVOGdg5GVsZqPdSU0CZndlf6AZ/viwIGO3U7Oe6SqqXLFTZbpN +PJSGqJfYGhwtxNY++EroWQ7AzK2cguiESS/p8PTCXi0o4hraekTDpj6cOeZNLccmyoL VpK0OShMzSSoM/aRAauZoowC+1tuCWLF8wMLhBMWgpa8jmIeo2+D4Gm7tuS5Mg0RmZt7 UI12QA5KThUJFX0QLJRzTQmKrBWHlqDiUjLopkB9xsnaNuWQRtA+ulHqcnrGbEHzI+Nc VTSmGca9y6pXk3Qgns9zD9GvPKFNfAVDrIF9NCr6eqiIPVds+O6GPjVPh88UFYYz9IkG WzAQ== X-Gm-Message-State: AOAM531+f0+2AryyenPM6vJ99LKgnXR1YxQvRPzeiL4qVGd61uVTIcBw Xva+VXfA/S8dCP4KOmk+PKbc7v2XTO8aqvZ1wdIltQ== X-Google-Smtp-Source: ABdhPJzYwS37ABqTiKQwZ10EGhb6Xw3TCIPsLwg9kh/n81YxE20FVc5+SZH0l6HCUwwxOLt8HLZk1SBTQjxnye6aKiQ= X-Received: by 2002:ac2:5219:: with SMTP id a25mr1326002lfl.264.1605600369050; Tue, 17 Nov 2020 00:06:09 -0800 (PST) MIME-Version: 1.0 References: <016b01d6bca9$cf908c20$6eb1a460$@tsinghua.org.cn> In-Reply-To: <016b01d6bca9$cf908c20$6eb1a460$@tsinghua.org.cn> From: Robert Raszuk Date: Tue, 17 Nov 2020 09:05:59 +0100 Message-ID: To: Aijun Wang Cc: Jeff Tantsura , lsr , "Acee Lindem (acee)" Content-Type: multipart/alternative; boundary="000000000000a61a4805b448f7d5" Archived-At: Subject: Re: [Lsr] Prefix Unreachable Announcement Use Cases X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 17 Nov 2020 08:06:18 -0000 --000000000000a61a4805b448f7d5 Content-Type: text/plain; charset="UTF-8" > Moreover it seems that it will just also prevent any local protection to > locally bypass the failed destination. > > *[WAJ] No, It will trigger the local protection instead, not prevent.* > > You missed my point. I am talking about *local* protection in a sense of adjacent node(s) to the PE/ASBR which failed. *Local* to the failure. You are talking about *local* protection on ingress to the network. Let's focus on this: Q1 - You are installing a /dev/null route in a router. That means that any packet sent to this destination will be dropped. How is this of any protection ? Q2 - What you may be actually trying to say is that by installing such PUA into RIB you will via RIB let know those clients (ex: BGP) which track this route that it is gone and that their possibly best path is no longer valid. Sure that is one way to share such information between IGP and BGP. But this needs to be described in the document that this is your intention. Otherwise when you say you are installing a drop route in RIB & FIB I am not sure how helpful that is (well other then transiently relaxing the network to drop some traffic few router hops away). Thx, R. --000000000000a61a4805b448f7d5 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

Moreover it seems that it w= ill just also prevent any local protection to locally bypass the failed des= tination.=C2=A0

[WAJ] No, It will trigger the= local protection instead, not prevent.


You = missed my point.=C2=A0

I am talking about *local* = protection in a sense of adjacent node(s) to the PE/ASBR which failed. *Loc= al* to the failure.=C2=A0

You are talking about *l= ocal* protection on ingress to the network. Let's focus on this:
<= div>
Q1 - You are installing a /dev/null route in a router. T= hat means that any packet sent to this destination will be dropped. How is = this=C2=A0of any protection ?=C2=A0

Q2 - What you = may be actually trying to say is that by installing such PUA into RIB you w= ill via RIB let know those clients (ex: BGP) which track this route that it= is gone and that their possibly best path is no longer valid. Sure that is= one way to share such information=C2=A0between IGP and BGP. But this needs= to be described in the=C2=A0document that this is your intention. Otherwis= e when you say you are installing a drop route in RIB & FIB I am not su= re how helpful that is (well other then transiently relaxing the network to= drop some traffic few router hops away).=C2=A0

Th= x,
R.


--000000000000a61a4805b448f7d5-- From nobody Tue Nov 17 00:27:31 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6FBF33A0846 for ; Tue, 17 Nov 2020 00:27:29 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.087 X-Spam-Level: X-Spam-Status: No, score=-2.087 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_REMOTE_IMAGE=0.01, URIBL_BLOCKED=0.001] autolearn=unavailable autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 4Ae2bwHiCwqb for ; Tue, 17 Nov 2020 00:27:26 -0800 (PST) Received: from mail-pl1-x635.google.com (mail-pl1-x635.google.com [IPv6:2607:f8b0:4864:20::635]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 1FF2C3A084D for ; Tue, 17 Nov 2020 00:27:26 -0800 (PST) Received: by mail-pl1-x635.google.com with SMTP id s2so9840508plr.9 for ; Tue, 17 Nov 2020 00:27:25 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=sABakDCzQCWDrbUvDduFuLy0SrPdsmNMVBoEaCvIWCU=; b=vMnqAsus3+m6BXjM/y0K9RJl9o0TJH4OYcPi2sjEnWUxTml4Zq4FqnCJIG22P+tz7o voQ5mp2I3q6kNXU85jxHd/3E04fMRjx/nS3lxAHcZAOuQOPdOylig7QXUTZcY+mcv7mw NVcOHdYM4GNnVrFoVm/63xzsoEuwYAB2P0GD2ObhWX+xx3QtyqViI0+s611rDXMdhqg/ /51/W+9oDj4sMavyIChg2OGBMn09I6uF30qr/JvA8YDLTi6q2iVqPgfd896yoeBTFrpK fYH1S0YNNDPiibkqPXYtDvhcdRDTi//KeKGzK4/hy95cBrieyzGk+dOQaS8+gVJ2l0qB zKwA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=sABakDCzQCWDrbUvDduFuLy0SrPdsmNMVBoEaCvIWCU=; b=ZmIkoteFOlJGSLhGWojLeG7ybLW45tNwkUfgLNf7CzHYS3hXSPcD1SKhWBtX5FLcFz t3tyODVHhAqrO4rMAnSG/SfrVuEgiRoFXUqj2rDuyUgc9NFd32oFhf8GlV1QarRzzQhy xbCEXRQzNDBhkQFK4wrU2AepPx5kUyDUXcF2FSzd9elxAy8CZ0UZi7ZOhjrN94U8XHVT G1KDAVb9URP9xm7T52WH0LYWcJbXd1O3CdarI5Tt69OoknAx5Dt4U5K9YiG8ARtUgsQU 4dBy0Tpm0dTYaU7tVNtSHBFebA+uEoxJtbTkdanJxnPIs2umqYIyz9cvi9XdpqoxL16B kBLg== X-Gm-Message-State: AOAM530PnpfM6qtUyC4nEDBNzxh0CLi1HI+iDvzDYkuOoIzGSRmGO+Ot fxhMVAN1PSc46x+xF8n3Y44CaNsIiomjw5Gh6Yo= X-Google-Smtp-Source: ABdhPJxaSKAi0fW34UoXSE3K/sGAPK0UaBzBfhPObwoELfDuvAVCbUuVlp7MAumoiaKf39DxodASS8VPy6/3Cyr6f9U= X-Received: by 2002:a17:90b:1490:: with SMTP id js16mr3421873pjb.215.1605601645372; Tue, 17 Nov 2020 00:27:25 -0800 (PST) MIME-Version: 1.0 References: <016b01d6bca9$cf908c20$6eb1a460$@tsinghua.org.cn> In-Reply-To: From: Gyan Mishra Date: Tue, 17 Nov 2020 03:20:47 -0500 Message-ID: To: Robert Raszuk Cc: Aijun Wang , lsr , Jeff Tantsura , "Acee Lindem (acee)" Content-Type: multipart/alternative; boundary="000000000000b927f005b4494336" Archived-At: Subject: Re: [Lsr] Prefix Unreachable Announcement Use Cases X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 17 Nov 2020 08:27:30 -0000 --000000000000b927f005b4494336 Content-Type: text/plain; charset="UTF-8" On Tue, Nov 17, 2020 at 3:06 AM Robert Raszuk wrote: > > Moreover it seems that it will just also prevent any local protection to >> locally bypass the failed destination. >> >> *[WAJ] No, It will trigger the local protection instead, not prevent.* >> >> > You missed my point. > > I am talking about *local* protection in a sense of adjacent node(s) to > the PE/ASBR which failed. *Local* to the failure. > > You are talking about *local* protection on ingress to the network. Let's > focus on this: > > Q1 - You are installing a /dev/null route in a router. That means that any > packet sent to this destination will be dropped. How is this of any > protection ? > > Q2 - What you may be actually trying to say is that by installing such PUA > into RIB you will via RIB let know those clients (ex: BGP) which track this > route that it is gone and that their possibly best path is no longer valid. > Sure that is one way to share such information between IGP and BGP. But > this needs to be described in the document that this is your intention. > Otherwise when you say you are installing a drop route in RIB & FIB I am > not sure how helpful that is (well other then transiently relaxing the > network to drop some traffic few router hops away). > Robert, I believe the original intention was related to having the data plane converge quickly when summarization is used and flip so traffic converges from the Active ABR to the Backup ABR. However PUA can be used in the absence of area segmentation within a single area when a link or node fails to converge the data plane quickly by sending PUA for the backup path so the active path. With the IGP tuned with BFD fast detection on ISIS or OSPF links and LFA & RLFA for MPLS or TI-LFA for SR local protection - with those tweaks the convergence is well into sub second. So for Intra area convergence with all the optimizations mentioned I am not sure how much faster the data plane will converge with PUA. The one use case I had mentioned to you in the past a while back is related to BGP PIC core convergence which I mentioned during the presentation as you brought up BGP next hop convergence as a use case on the ML. So in cases where you run BGP PIC edge and have the pre programmed backup path best-external add-paths advertised backup paths you are set, however with BGP PIC core prefix independent convergence with the H-FIB next hop rib convergence - with next-hop-self rewrite to the loopback, the loopback never goes down so that does impact iBGP path PIC core convergence. So a workaround is to not do next hop self and so when link goes down its detected and that fixes the issue. Downside is you now have a massive LFIB FEC binding database if you have tons of customer edges. So I think PUA could help for this but I was trying to connect the dots and I think there is something missing but maybe we can figure out how PUA can be leveraged to fix the PIC Core convergence. I am assuming that is what you meant on the ML with next hop tracking convergence would be the obvious use case for PUA. So the tricky part here is you you can send a PUA when your PE-CE link goes down and now your H-FIB IGP forwarding plane would now converge immediately on the alternate PUA path, however you still have next-hop-self rewrite happening to the loopback which is still Up. So even though PUA fixed the Core IGP detection of the PE-CE link failure, it did not fix the next hop self rewrite to the loopback which is always Up. I guess there would be still an improvement with data plane convergence for the PE-CE with the PUA being sent to converge the BGP next hop when "next hop self" is not used. It would be nice if there was some way to make PUA fix the next-hop-self rewrite to loopback to improve PIC core convergence. You would need a flag to tie the loopback to the PE-CE connected interfaces state to be tracked. I believe you wrote a draft way back that fixes that issue but was never adopted I believe. I would have to dig up on ML to find it. > > Thx, > R. > > > _______________________________________________ > Lsr mailing list > Lsr@ietf.org > https://www.ietf.org/mailman/listinfo/lsr > -- *Gyan Mishra* *Network Solutions A**rchitect * *M 301 502-134713101 Columbia Pike *Silver Spring, MD --000000000000b927f005b4494336 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable


=
On Tue, Nov 17, 2020 at 3:06 AM Rober= t Raszuk <robert@raszuk.net>= wrote:

Moreover it= seems that it will just also prevent any local protection to locally bypas= s the failed destination.=C2=A0

[WAJ] No, It = will trigger the local protection instead, not prevent.

<= /div>
You missed my point.=C2=A0

I am talkin= g about *local* protection in a sense of adjacent node(s) to the PE/ASBR wh= ich failed. *Local* to the failure.=C2=A0

You are = talking about *local* protection on ingress to the network. Let's focus= on this:

Q1 - You are installing a /dev/null rout= e in a router. That means that any packet sent to this destination will be = dropped. How is this=C2=A0of any protection ?=C2=A0

Q2 - What you may be actually trying to say is that by installing such PU= A into RIB you will via RIB let know those clients (ex: BGP) which track th= is route that it is gone and that their possibly best path is no longer val= id. Sure that is one way to share such information=C2=A0between IGP and BGP= . But this needs to be described in the=C2=A0document that this is your int= ention. Otherwise when you say you are installing a drop route in RIB &= FIB I am not sure how helpful that is (well other then transiently relaxin= g the network to drop some traffic few router hops away).=C2=A0
    The draft describes extensions to IGP for a node to distribut= e
capabilities of its links. The capability information about
all the links in a network may be used by another entity such as =
a controller.

I have following comments:
1). In section 3, the capabilities of a link or a node is represented =
by "Processing Action" (refer to Fig. 1 in the draft). Why d= o you include
"Max EH Len" in the "Processing Action"? It is not= a capability.
2). The text describing the format of "Processing Action"
below seems not consistent with the format in Fig. 1.
"... processing action formed of
a tuple of a 1-octet Extension Header Options identifier and 8-bit
Processing Action Flag."
The above text occurs twice in the draft.
3). It seems that using word "signal" or "signaling&quo= t; in the draft
is not good. It is better to use another word and rephrase the related text= .

Best Regards,
Huaimo
From: Lsr <lsr-bounces@i= etf.org> on behalf of wangyali <wangyali11@huawei.com>
Sent: Thursday, October 29, 2020 9:19 AM
To: lsr@ietf.org <lsr@ietf.org>
Subject: [Lsr] New Version for draft-wang-lsr-hbh-process-00
 
Hello WG,

Considering the Hop-by-Hop Options header has been used for IOAM [I-D.ietf-= ippm-ioam-ipv6-options], Alternate Marking method [I-D.ietf-6man-ipv6-alt-m= ark], etc., but as specified in RFC8200, the Hop-by-Hop Options header is o= nly examined and processed if it is explicitly configured. In this case, nodes may be configured to ignore = the Hop-by-Hop Options header, drop packets containing a Hop-by-Hop Options= header, or assign packets containing a Hop-by-Hop Options header to a slow= processing path. Thus, the performance measurement does not account for all links and nodes along a path. In addi= tion, packets carrying a Hop-by-Hop Options header may be dropped, which gr= avely deteriorates network performance.

Therefore, we propose a new draft about IGP extensions for signaling Hop-by= -Hop Options header processing action at node and link granularity. Such ad= vertisement is useful for entities (e.g., the centralized controller) to ga= ther each router's processing action for achieving the computation of TE paths that be able to support a specif= ic service encoded in the Hop-by-Hop Options header.

Please let us know your opinion. Questions and comments are very welcome.
Best regards,
Yali


-----Original Message-----
From: internet-drafts@ietf.org [mailto:internet-drafts@ietf.org]
Sent: Thursday, October 29, 2020 8:42 PM
To: Tianran Zhou <zhoutianran@huawei.com>; Huzhibo <huzhibo@huawei= .com>; wangyali <wangyali11@huawei.com>
Subject: New Version Notification for draft-wang-lsr-hbh-process-00.txt


A new version of I-D, draft-wang-lsr-hbh-process-00.txt has been successful= ly submitted by Yali Wang and posted to the IETF repository.

Name:           draft-wan= g-lsr-hbh-process
Revision:       00
Title:          IGP Extensions= for Advertising Hop-by-Hop Options Header Processing Action
Document date:  2020-10-29
Group:          Individual Sub= mission
Pages:          10
URL:            https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fwww.iet= f.org%2Farchive%2Fid%2Fdraft-wang-lsr-hbh-process-00.txt&amp;data=3D04%= 7C01%7Chuaimo.chen%40futurewei.com%7C1b6010e28c9345df423708d87c0d5f8f%7C0fe= e8ff2a3b240189c753a1d5591fedc%7C1%7C1%7C637395744183598793%7CUnknown%7CTWFp= bGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%= 7C2000&amp;sdata=3DtvJH5rnR%2BAj%2FxTTaxxbKJ6z%2F1OKAog3QdCCJnJkKB2I%3D= &amp;reserved=3D0
Status:         https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fdatatra= cker.ietf.org%2Fdoc%2Fdraft-wang-lsr-hbh-process%2F&amp;data=3D04%7C01%= 7Chuaimo.chen%40futurewei.com%7C1b6010e28c9345df423708d87c0d5f8f%7C0fee8ff2= a3b240189c753a1d5591fedc%7C1%7C1%7C637395744183598793%7CUnknown%7CTWFpbGZsb= 3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C200= 0&amp;sdata=3DWt7W0PL8HGI1EaPK8sV92RWIRGXATD0RGx1AhGIH6xk%3D&amp;re= served=3D0
Htmlized:       https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fdatatra= cker.ietf.org%2Fdoc%2Fhtml%2Fdraft-wang-lsr-hbh-process&amp;data=3D04%7= C01%7Chuaimo.chen%40futurewei.com%7C1b6010e28c9345df423708d87c0d5f8f%7C0fee= 8ff2a3b240189c753a1d5591fedc%7C1%7C1%7C637395744183598793%7CUnknown%7CTWFpb= GZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7= C2000&amp;sdata=3DZmi3lDpE2aNulJxCiyU%2B9XQzv63EPeMo%2BAWVkatiDRE%3D&am= p;amp;reserved=3D0
Htmlized:       https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Ftools.i= etf.org%2Fhtml%2Fdraft-wang-lsr-hbh-process-00&amp;data=3D04%7C01%7Chua= imo.chen%40futurewei.com%7C1b6010e28c9345df423708d87c0d5f8f%7C0fee8ff2a3b24= 0189c753a1d5591fedc%7C1%7C1%7C637395744183598793%7CUnknown%7CTWFpbGZsb3d8ey= JWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C2000&= ;amp;sdata=3Dm9Z1uy3W4tT73SQod1DpcT%2BU4malMI25xQtNHTSwkdY%3D&amp;reser= ved=3D0


Abstract:
   This document extends Node and Link attribute TLVs to Interior=
   Gateway Protocols (IGP) to advertise the Hop-by-Hop Options he= ader
   processing action and supported services (e.g.  IOAM Trac= e Option and
   Alternate Marking) at node and link granularity.  Such ad= vertisements
   allow entities (e.g., centralized controllers) to determine wh= ether
   the Hop-by-Hop Options header and specific services can be sup= ported
   in a given network.


            &nb= sp;            =             &nb= sp;            =             &nb= sp;            =       


Please note that it may take a couple of minutes from the time of submissio= n until the htmlized version and diff are available at tools.ietf.org.

The IETF Secretariat


_______________________________________________
Lsr mailing list
Lsr@ietf.org
https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2= Fwww.ietf.org%2Fmailman%2Flistinfo%2Flsr&amp;data=3D04%7C01%7Chuaimo.ch= en%40futurewei.com%7C1b6010e28c9345df423708d87c0d5f8f%7C0fee8ff2a3b240189c7= 53a1d5591fedc%7C1%7C1%7C637395744183598793%7CUnknown%7CTWFpbGZsb3d8eyJWIjoi= MC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C2000&amp;s= data=3DFae4vhjYo1fN5aIkVTTYMlANFCNyH%2FvxkyznvdjL%2B6U%3D&amp;reserved= =3D0
--_000_MN2PR13MB40871F3CD1BC0BE44FD47398F2E20MN2PR13MB4087namp_-- From nobody Mon Nov 16 22:07:58 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B98163A0F09 for ; Mon, 16 Nov 2020 22:07:55 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.9 X-Spam-Level: X-Spam-Status: No, score=-1.9 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id t6bYoiOLXAxR for ; Mon, 16 Nov 2020 22:07:52 -0800 (PST) Received: from chinatelecom.cn (prt-mail.chinatelecom.cn [42.123.76.227]) by ietfa.amsl.com (Postfix) with ESMTP id CB8213A0EF8 for ; Mon, 16 Nov 2020 22:07:51 -0800 (PST) HMM_SOURCE_IP: 172.18.0.48:49246.1407173818 HMM_ATTACHE_NUM: 0000 HMM_SOURCE_TYPE: SMTP Received: from clientip-219.142.69.75?logid-2b5cfb1c1262416aaa177636aa3aacdc (unknown [172.18.0.48]) by chinatelecom.cn (HERMES) with SMTP id CE68F280090; Tue, 17 Nov 2020 14:07:46 +0800 (CST) X-189-SAVE-TO-SEND: 66040164@chinatelecom.cn Received: from ([172.18.0.48]) by App0024 with ESMTP id 2b5cfb1c1262416aaa177636aa3aacdc for acee@cisco.com; Tue Nov 17 14:07:47 2020 X-Transaction-ID: 2b5cfb1c1262416aaa177636aa3aacdc X-filter-score: filter<0> X-Real-From: wangaj3@chinatelecom.cn X-Receive-IP: 172.18.0.48 X-MEDUSA-Status: 0 Sender: wangaj3@chinatelecom.cn From: "Aijun Wang" To: "'Acee Lindem \(acee\)'" Cc: "'lsr'" References: <160539745568.19790.10758399794139845841@ietfa.amsl.com> In-Reply-To: <160539745568.19790.10758399794139845841@ietfa.amsl.com> Date: Tue, 17 Nov 2020 14:07:44 +0800 Message-ID: <016a01d6bca7$f8753700$e95fa500$@chinatelecom.cn> MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Mailer: Microsoft Outlook 16.0 Content-Language: zh-cn Thread-Index: AQIF418f17swSsDbQCwbOqY53zNVtKlthx8w Archived-At: Subject: [Lsr] FW: New Version Notification for draft-wang-lsr-passive-interface-attribute-06.txt X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 17 Nov 2020 06:07:56 -0000 Hi, Acee: As discussed on the list and during the 109 meeting, we have updated the = draft to reflect the comments from the LSR community. Please see whether you have still other concerns or not and if there is = no further comments on this direction, can we begin the WG adoption call = then? Thanks you and Peter for your intense discussions for this draft. Thanks in advance. Best Regards Aijun Wang China Telecom > -----Original Message----- > From: internet-drafts@ietf.org > Sent: Sunday, November 15, 2020 7:44 AM > To: Zhibo Hu ; Aijun Wang > ; Gyan S. Mishra ; > Gyan Mishra > Subject: New Version Notification for > draft-wang-lsr-passive-interface-attribute-06.txt >=20 >=20 > A new version of I-D, = draft-wang-lsr-passive-interface-attribute-06.txt > has been successfully submitted by Aijun Wang and posted to the IETF > repository. >=20 > Name: draft-wang-lsr-passive-interface-attribute > Revision: 06 > Title: Passive Interface Attribute > Document date: 2020-11-15 > Group: Individual Submission > Pages: 10 > URL: > = https://www.ietf.org/archive/id/draft-wang-lsr-passive-interface-attribut= e-06.t > xt > Status: > = https://datatracker.ietf.org/doc/draft-wang-lsr-passive-interface-attribu= te/ > Htmlized: > = https://datatracker.ietf.org/doc/html/draft-wang-lsr-passive-interface-at= tribut > e > Htmlized: > = https://tools.ietf.org/html/draft-wang-lsr-passive-interface-attribute-06= > Diff: > = https://www.ietf.org/rfcdiff?url2=3Ddraft-wang-lsr-passive-interface-attr= ibute-06 >=20 > Abstract: > This document describes the mechanism that can be used to > differentiate the passive interfaces from the normal interfaces > within ISIS or OSPF domain. >=20 >=20 >=20 >=20 > Please note that it may take a couple of minutes from the time of = submission > until the htmlized version and diff are available at tools.ietf.org. >=20 > The IETF Secretariat >=20 From nobody Mon Nov 16 22:21:06 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 13F653A0FCE for ; Mon, 16 Nov 2020 22:21:05 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.896 X-Spam-Level: X-Spam-Status: No, score=-1.896 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id hkBpvSK0e2fu for ; Mon, 16 Nov 2020 22:21:02 -0800 (PST) Received: from mail-m127101.qiye.163.com (mail-m127101.qiye.163.com [115.236.127.101]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id DDC843A0FCC for ; Mon, 16 Nov 2020 22:21:01 -0800 (PST) Received: from DESKTOP2IOH5QC (unknown [219.142.69.75]) by mail-m127101.qiye.163.com (Hmail) with ESMTPA id DC9D84852D; Tue, 17 Nov 2020 14:20:57 +0800 (CST) From: "Aijun Wang" To: "'Jeff Tantsura'" , "'Robert Raszuk'" Cc: "'lsr'" , "'Acee Lindem \(acee\)'" References: In-Reply-To: Date: Tue, 17 Nov 2020 14:20:56 +0800 Message-ID: <016b01d6bca9$cf908c20$6eb1a460$@tsinghua.org.cn> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_016C_01D6BCEC.DDB72780" X-Mailer: Microsoft Outlook 16.0 Content-Language: zh-cn Thread-Index: AQILbNEP0SRic90ZNEbpRjygmkrFZQJx5udEqU7nmVA= X-HM-Spam-Status: e1kfGhgUHx5ZQUtXWQgYFAkeWUFZS1VLWVdZKFlBSkxLS0o3V1ktWUFJV1 kPCRoVCBIfWUFZQ0JIH0NNGkpLQ0gfVkpNS05OQk9LTkNKTEpVEwETFhoSFyQUDg9ZV1kWGg8SFR 0UWUFZT0tIVUpKS09ISFVLWQY+ X-HM-Sender-Digest: e1kMHhlZQR0aFwgeV1kSHx4VD1lBWUc6Okk6NBw4Lz8qMwgCPjFIPh4o PSkwC01VSlVKTUtOTkJPS05DTkNCVTMWGhIXVQwaFRwaEhEOFTsPCBIVHBMOGlUUCRxVGBVFWVdZ EgtZQVlJSkJVSk9JVU1CVUxOWVdZCAFZQUpOTUxMNwY+ X-HM-Tid: 0a75d4dd0d469865kuuudc9d84852d Archived-At: Subject: Re: [Lsr] Prefix Unreachable Announcement Use Cases X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 17 Nov 2020 06:21:05 -0000 This is a multipart message in MIME format. ------=_NextPart_000_016C_01D6BCEC.DDB72780 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi, Jeff and Robert: =20 Please see the response inlines. =20 From: Jeff Tantsura =20 Sent: Monday, November 16, 2020 6:36 PM To: Robert Raszuk Cc: Aijun Wang ; lsr ; Acee = Lindem (acee) Subject: Re: [Lsr] Prefix Unreachable Announcement Use Cases =20 +1 with Robert. =20 So you expect the following RIB state after PUA has been advertised: 10.0.0.1 - drop 10/24 - forward=20 [WAJ] Yes, this is the expected result. =20 Unless there=E2=80=99s a recursively discarded next-hop (ala RTBH ) - = how do you envision it? [WAJ] This is the action that the node receives the PUA should do. = Existing router may not support it, so we define the PUA capabilities = announcement in section-6.3 of this draft = =20 Regards, Jeff On Nov 16, 2020, at 00:25, Robert Raszuk > wrote: =EF=BB=BF I was not bringing RIFT's negative routies example as something = inherently negative. I was just pointing it out to illustrate that = today's data plane lookup does not really support "if does not match" = checks. [WAJ] In data plane, the device do still the =E2=80=9Cmatch=E2=80=9D = check, not =E2=80=9Cdoes not match=E2=80=9D check. When the router = receives the PUA information, it will install one black hole route for a = short time. =20 So your idea is that you install route for unreachable prefix to = /dev/null ?=20 [WAJ] Yes. =20 And how would that help connectivity restoration ?=20 [WAJ] This action will trigger the path protection procedures, which = will divert the traffic to other backup path. =20 Moreover it seems that it will just also prevent any local protection to = locally bypass the failed destination.=20 [WAJ] No, It will trigger the local protection instead, not prevent. =20 Bottom line is that I agree with one problem statement. However IMHO = described actions upon reception of PUA are questionable at best.=20 =20 Cheers, R. ------=_NextPart_000_016C_01D6BCEC.DDB72780 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

H= i, Jeff and Robert:

<= o:p> 

P= lease see the response inlines.

<= o:p> 

From:<= /b> Jeff = Tantsura <jefftant.ietf@gmail.com>
Sent: Monday, = November 16, 2020 6:36 PM
To: Robert Raszuk = <robert@raszuk.net>
Cc: Aijun Wang = <wangaijun@tsinghua.org.cn>; lsr <lsr@ietf.org>; Acee Lindem = (acee) <acee=3D40cisco.com@dmarc.ietf.org>
Subject: Re: = [Lsr] Prefix Unreachable Announcement Use = Cases

 

+1 with Robert.

 

So you expect the following RIB state after PUA has been = advertised:

10.0.0.1 - drop

10/24 - forward 

[= WAJ] Yes, this is the expected result.<= o:p>

 

Unless there=E2=80=99s a recursively discarded next-hop = (ala RTBH )  - how do you envision it?

[= WAJ] This is the action that the node receives the PUA should do. = Existing router may not support it, so we define the PUA capabilities = announcement in section-6.3 of this draft =

Regards,

Jeff



On = Nov 16, 2020, at 00:25, Robert Raszuk <robert@raszuk.net> = wrote:

=EF=BB=BF

I was not bringing RIFT's negative = routies example as something inherently negative. I was just pointing it = out to illustrate that today's data plane lookup does not really support = "if does not match" checks.

[= WAJ] In data plane, the device do still the =E2= =80=9Cmatch=E2=80=9D check, = not =E2=80=9Cdoes not = match=E2=80=9D check.  When the router = receives the PUA information, it will install one black hole route for a = short time.

<= div>

 

So your idea is that you install route for unreachable = prefix to /dev/null ? 

[= WAJ] Yes.<= o:p>

 

And how would that help connectivity restoration = ? 

[= WAJ] This action will trigger the path protection procedures, which will = divert the traffic to other backup path.<= o:p>

 

Moreover it seems that it will just also prevent any local = protection to locally bypass the failed = destination. 

[= WAJ] No, It will trigger the local protection instead, not = prevent.<= o:p>

 

Bottom line is that I agree with one problem statement. = However IMHO described actions upon reception of PUA are questionable at = best. 

 

Cheers,
R.

<= /blockquote>
------=_NextPart_000_016C_01D6BCEC.DDB72780-- From nobody Mon Nov 16 22:31:18 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id CFECA3A101A for ; Mon, 16 Nov 2020 22:31:16 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.498 X-Spam-Level: X-Spam-Status: No, score=-1.498 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FORGED_FROMDOMAIN=0.25, FREEMAIL_FROM=0.001, HEADER_FROM_DIFFERENT_DOMAINS=0.25, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001] autolearn=no autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id afxF_exfTl86 for ; Mon, 16 Nov 2020 22:31:15 -0800 (PST) Received: from mail-pf1-x433.google.com (mail-pf1-x433.google.com [IPv6:2607:f8b0:4864:20::433]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 403253A1003 for ; Mon, 16 Nov 2020 22:31:15 -0800 (PST) Received: by mail-pf1-x433.google.com with SMTP id t8so278172pfg.8 for ; Mon, 16 Nov 2020 22:31:15 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:from:message-id:mime-version:subject:date:in-reply-to:cc:to :references; bh=Qnu9oLL40I2GblavovRvl40z2rLbf1XwpYJ9RQSMwRY=; b=ErHxR2/sPw0+QKX4H7IhzdqtRNvjReH7VHu2r7lF1T2BiSseVvVFtFu+bKZQzLmavQ oGD/6pdeBTUKqNEKWK7UdFmJg+fCUWd8e8tmEk7rrJpa76YLUG8jEq/HFxtdIooiTaK7 muYFnXws8xt0eRxqyMAR5IpAl6NeJnJFQNH90LVvMLa3EEJiObKNjNtQglHH9IwUtJOH L012ERJkalVVeWJsK1JdnF4zk2Z/56N3li5XWrLspUHUOvSyP7R9BHxHDwNVHv7nU+VM iP5Cu/o9JxPrQPuDa5WKuugMwEDwlDtTez50gX770LuQSPZ2mBOQfZiClktoSfcgkfgR nhRA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:from:message-id:mime-version:subject:date :in-reply-to:cc:to:references; bh=Qnu9oLL40I2GblavovRvl40z2rLbf1XwpYJ9RQSMwRY=; b=joYV8wz87QLw/DNAoVaR87o+jqj+3+lEned5FS5gX+4hjUpw2DJgU/9jhar3rkmwlI JUEM+M7SkxjKjdf/x9cS3CCdyryXvi61gse6uQlQDYzxiCYbIBP2Avyab6QuGyBXqe+H hv+ILXzMCZ6Ti2pDTL2mdTs2rNVGGnRxYIcBmolPyTf79WrRYs+sPKegSdA1VCyL+KNJ 10Xpgh8yuLvp5q4iXW1bOYO3HdyFmU6Qg1xiajUKVAPar/5r3HTK3CFVEQcc88QAi2Tw QchaV+3pljpARz1ZjNwXK3GiQM1WARSZxl3H/e/s7C86zXO8+P/wqisuc1ZATldNHRo7 4niA== X-Gm-Message-State: AOAM531ba6SuoqR/vYJ/2Bcm2O0TUlpBfMeWSGxY/7zbzEGzC6XNBQIS U32M5ED+efjCpkquQO+fHAU= X-Google-Smtp-Source: ABdhPJyDg9+gNk6OpEIPo0FkZIMHksXcwdC9fvWJANtceMaLXkOMXt0tZALX1/WKE5BgN4aDjnwNRg== X-Received: by 2002:a17:90a:6907:: with SMTP id r7mr3286253pjj.208.1605594674675; Mon, 16 Nov 2020 22:31:14 -0800 (PST) Received: from [192.168.4.24] (c-67-169-103-239.hsd1.ca.comcast.net. [67.169.103.239]) by smtp.gmail.com with ESMTPSA id 15sm2109673pjy.0.2020.11.16.22.31.13 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Mon, 16 Nov 2020 22:31:14 -0800 (PST) Sender: Tony Li From: tony.li@tony.li Message-Id: <4CCB3F3C-8537-4072-8763-D4B3C557EBD9@tony.li> Content-Type: multipart/alternative; boundary="Apple-Mail=_71F65CCC-1DF6-43EB-91DF-C8C726696AB8" Mime-Version: 1.0 (Mac OS X Mail 13.4 \(3608.120.23.2.4\)) Date: Mon, 16 Nov 2020 22:31:12 -0800 In-Reply-To: <016b01d6bca9$cf908c20$6eb1a460$@tsinghua.org.cn> Cc: Jeff Tantsura , Robert Raszuk , lsr , "Acee Lindem (acee)" To: Aijun Wang References: <016b01d6bca9$cf908c20$6eb1a460$@tsinghua.org.cn> X-Mailer: Apple Mail (2.3608.120.23.2.4) Archived-At: Subject: Re: [Lsr] Prefix Unreachable Announcement Use Cases X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 17 Nov 2020 06:31:17 -0000 --Apple-Mail=_71F65CCC-1DF6-43EB-91DF-C8C726696AB8 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 >> And how would that help connectivity restoration ?=20 >> [WAJ] This action will trigger the path protection procedures, which = will divert the traffic to other backup path. This seems to be making some major assumptions about how path protection = features operate. Those assumptions need to be very explicitly called out. The path protection features that I=E2=80=99m familiar with are = triggered by topological changes along the existing operable path. A PUA does not provide that. Rather, it=E2=80=99s something of a temporary = signal saying =E2=80=99this broke=E2=80=99. Without more specifics about = the failure, it=E2=80=99s difficult to=20 understand exactly what path protection should make of this. If a = prefix is unreachable, the obvious implication is that the associated = link has failed. Path protection in a remote area is highly unlikely to have the = topological details necessary to find an alternate path to that prefix. Tony --Apple-Mail=_71F65CCC-1DF6-43EB-91DF-C8C726696AB8 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8

And how would that help = connectivity restoration ? 
[WAJ] This action will trigger = the path protection procedures, which will divert the traffic to other = backup path.
<= /div>


This seems to be making some major assumptions = about how path protection features operate. Those assumptions need to = be
very explicitly called out.

The path protection features that I=E2=80=99m = familiar with are triggered by topological changes along the existing = operable path. A PUA
does not provide that.  Rather, = it=E2=80=99s something of a temporary signal saying =E2=80=99this = broke=E2=80=99. Without more specifics about the failure, it=E2=80=99s = difficult to 
understand exactly what path protection = should make of this.  If a prefix is unreachable, the obvious = implication is that the associated link has
failed.  Path = protection in a remote area is highly unlikely to have the topological = details necessary to find an alternate path to that = prefix.

Tony

= --Apple-Mail=_71F65CCC-1DF6-43EB-91DF-C8C726696AB8-- From nobody Mon Nov 16 23:58:19 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 339E73A005E for ; Mon, 16 Nov 2020 23:58:17 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.087 X-Spam-Level: X-Spam-Status: No, score=-2.087 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_REMOTE_IMAGE=0.01, URIBL_BLOCKED=0.001] autolearn=unavailable autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id mFKqKvkIrPNz for ; Mon, 16 Nov 2020 23:58:14 -0800 (PST) Received: from mail-pf1-x42a.google.com (mail-pf1-x42a.google.com [IPv6:2607:f8b0:4864:20::42a]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 4594B3A003F for ; Mon, 16 Nov 2020 23:58:14 -0800 (PST) Received: by mail-pf1-x42a.google.com with SMTP id 131so6253254pfb.9 for ; Mon, 16 Nov 2020 23:58:14 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=T4kj+S0RXhiMj8aFb16I2Gprp9Fc/z4H5S55JHmzduw=; b=uQT1//JRt/ExDFoh4uVxx7hsk15BhsFqQUQMfxMzPA9TpUUo09euaeNY6kF67NPV58 hf2ICjexwEQNIz5whKAien2uS1qb6eS9MzMdSIXZfLNskY2BXeJqimYpR8C25MXH6Z60 QFWK3IUPMvkdXlpLUedJLw8tJYOP6AhhwZJ5S9M+DUwt2BujKoZvCF6V7gjPtSM8Meiv xecKAfh2loUTBJK8HDSZqvHQEYif266wTwYLaTQhbMeK0dK8tiymU05LRaOlhCs7WGL7 n8PYra6ocZwdkPnwTCU4plPQOVPcQ+MThS+ayXmdFjDAhsiWG/n/caKcJNdhKpjKPNmt kUqQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=T4kj+S0RXhiMj8aFb16I2Gprp9Fc/z4H5S55JHmzduw=; b=tJOHUU2kuUSYJwMPVvXOJi1PPitin6kCwE06y3rgUuJdwnj6DuKuTZDms0Cd4hXjR/ n/n55UyFUHFuh9gFEQRaQHmMrH6XFetsxNi7SUpOO+3iZkL+1OaZFJcJpkkAkUfaPSa+ CKBO6hAjK2RunIks13eKEnSUOQWsLGOYpQwJTG8/gv6UxxxhfG8aYo9TQB7hfAyESCni J1FWDa7ZMxWPMKL+guffwiCw+PLYqEjJA2Q8Ft+AU+vvvPMiLuJZrfU6WUX3hev7Y2Bo WwDQO9Yj/ioiceqGF//jMRjw5p8HWMxLMhb3Q2myqEju1ChhmZJKgcpG2iNO7UoKpDYx y88Q== X-Gm-Message-State: AOAM531NRk3FypHuVU6YtuYb30VzNbzwtb9zRa7AvbtPmZXOCQxCJnXx tOOI8fRdjJGevL8hgl1I9pgXeNb8HfgMq2WETD4= X-Google-Smtp-Source: ABdhPJzLhQNHabDg6J5FHTg0a2BlFlSFd7PpQ4PT0FcEaU1wKaJ5I5APZK73EgvxHmV3f1h7eKhegqdEkmkzkS/CFJk= X-Received: by 2002:a17:90a:c254:: with SMTP id d20mr3367123pjx.112.1605599893774; Mon, 16 Nov 2020 23:58:13 -0800 (PST) MIME-Version: 1.0 References: <016b01d6bca9$cf908c20$6eb1a460$@tsinghua.org.cn> <4CCB3F3C-8537-4072-8763-D4B3C557EBD9@tony.li> In-Reply-To: <4CCB3F3C-8537-4072-8763-D4B3C557EBD9@tony.li> From: Gyan Mishra Date: Tue, 17 Nov 2020 02:51:35 -0500 Message-ID: To: Tony Li Cc: Aijun Wang , lsr , Jeff Tantsura , Robert Raszuk , "Acee Lindem (acee)" Content-Type: multipart/alternative; boundary="00000000000051e32d05b448dbf0" Archived-At: Subject: Re: [Lsr] Prefix Unreachable Announcement Use Cases X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 17 Nov 2020 07:58:17 -0000 --00000000000051e32d05b448dbf0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Tony I agree. We have to be careful not to confuse path protection mentioned to RSVP FRR protection based on TEDs or LFA style local protection. We will redo the verbiage carefully to not call use pre-existing terminology term that will add confusion. Thanks for the feedback!! Thanks Gyan On Tue, Nov 17, 2020 at 1:31 AM wrote: > > And how would that help connectivity restoration ? > *[WAJ] This action will trigger the path protection procedures, which wil= l > divert the traffic to other backup path.* > > > > This seems to be making some major assumptions about how path protection > features operate. Those assumptions need to be > very explicitly called out. > > The path protection features that I=E2=80=99m familiar with are triggered= by > topological changes along the existing operable path. A PUA > does not provide that. Rather, it=E2=80=99s something of a temporary sig= nal > saying =E2=80=99this broke=E2=80=99. Without more specifics about the fai= lure, it=E2=80=99s > difficult to > understand exactly what path protection should make of this. If a prefix > is unreachable, the obvious implication is that the associated link has > failed. Path protection in a remote area is highly unlikely to have the > topological details necessary to find an alternate path to that prefix. > > Tony > > _______________________________________________ > Lsr mailing list > Lsr@ietf.org > https://www.ietf.org/mailman/listinfo/lsr > --=20 *Gyan Mishra* *Network Solutions A**rchitect * *M 301 502-134713101 Columbia Pike *Silver Spring, MD --00000000000051e32d05b448dbf0 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Tony

I agree.=C2=A0 We have to be caref= ul not to confuse path protection mentioned to RSVP FRR protection based on= TEDs or LFA style local protection.=C2=A0 We will redo the verbiage carefu= lly to not call use pre-existing terminology term that will add confusion.<= /div>

Thanks for the feedback!!

Thanks

Gyan

On Tue, Nov 17, 2020 at 1:31 AM = <tony.li@tony.li> wrote:

An= d how would that help connectivity restoration ?=C2=A0=
[WAJ] This action will = trigger the path protection procedures, which will divert the traffic to ot= her backup path.


This seems to be making some major assumptio= ns about how path protection features operate. Those assumptions need to be=
very explicitly called out.

The path pr= otection features that I=E2=80=99m familiar with are triggered by topologic= al changes along the existing operable path. A PUA
does not provi= de that.=C2=A0 Rather, it=E2=80=99s something of a temporary signal saying = =E2=80=99this broke=E2=80=99. Without more specifics about the failure, it= =E2=80=99s difficult to=C2=A0
understand exactly what path protec= tion should make of this.=C2=A0 If a prefix is unreachable, the obvious imp= lication is that the associated link has
failed.=C2=A0 Path prote= ction in a remote area is highly unlikely to have the topological details n= ecessary to find an alternate path to that prefix.

Tony

___________________________________________= ____
Lsr mailing list
Lsr@ietf.org
https://www.ietf.org/mailman/listinfo/lsr
=

=C2=A0 =C2=A0Robert, I believe the o= riginal intention was related to having the data plane converge quickly whe= n summarization is used and flip so traffic converges from the Active ABR t= o the Backup ABR.=C2=A0
=C2=A0 =C2=A0
=C2=A0 =C2=A0Howe= ver PUA can be used in the absence of area segmentation within a single are= a when a link or node fails to converge the data plane quickly by sending P= UA for the backup path so the active path.=C2=A0
=C2=A0 =C2=A0=C2= =A0
=C2=A0 =C2=A0 With the IGP tuned with BFD fast detection on I= SIS or OSPF links and LFA & RLFA for MPLS or TI-LFA for SR local protec= tion - with those tweaks the convergence is well into sub second.=C2=A0 So = for Intra area convergence with all the optimizations mentioned I am not su= re how much faster the data plane will converge with PUA.

=C2=A0 =C2=A0 The=C2=A0 one use case I had mentioned to you in the = past a while back is related to BGP PIC core convergence which I mentioned = during the presentation as you brought up BGP next hop convergence as a use= case on the ML.=C2=A0 So in cases where you run BGP PIC edge and have the = pre programmed backup path best-external add-paths advertised backup paths = you are set, however with BGP PIC core prefix independent convergence with = the H-FIB next hop rib convergence - with next-hop-self rewrite to the loop= back, the loopback never goes down so that does impact iBGP path PIC core c= onvergence.=C2=A0 So a workaround is to not do next hop self and so when li= nk goes down its detected and that fixes the issue.=C2=A0 Downside is you n= ow have a massive LFIB FEC binding database if you have tons of customer ed= ges.=C2=A0 So I think PUA could help for this but I was trying to connect t= he dots and I think there is something missing but maybe we can figure out = how PUA can be leveraged to fix the PIC Core convergence.=C2=A0 I am assumi= ng that is what you meant on the ML with next hop tracking convergence woul= d be the obvious use case for PUA.=C2=A0 So the tricky part here is you you= can send a PUA when your PE-CE link goes down and now your H-FIB IGP forwa= rding plane would now converge immediately on the alternate PUA path, howev= er you still have next-hop-self rewrite happening to the loopback which is = still Up.=C2=A0 So even though PUA fixed the Core IGP detection of the PE-C= E link failure, it did not fix the next hop self rewrite to the loopback wh= ich is always Up.=C2=A0 I guess there would be still an improvement with da= ta plane convergence for the PE-CE with the PUA being sent to converge the = BGP next hop when "next hop self" is not used.=C2=A0 It would be = nice if there was some way to make PUA fix the next-hop-self rewrite to loo= pback to improve PIC core convergence.=C2=A0 You would need a flag to tie t= he loopback to the PE-CE connected interfaces state to be tracked.=C2=A0 I = believe you wrote a draft way back that fixes that issue but was never adop= ted I believe.=C2=A0 I would have to dig up on ML to find it.

Thx,
R.

_______________________________________________
Lsr mailing list
Lsr@ietf.org
https://www.ietf.org/mailman/listinfo/lsr


--

Gyan Mishra

Network Solutions A= rchitect=C2= =A0

M 301 502-1347
13101 Columbia= Pike=C2=A0
Silver Spring, MD


<= /div>
--000000000000b927f005b4494336-- From nobody Tue Nov 17 00:36:40 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6327E3A0982 for ; Tue, 17 Nov 2020 00:36:38 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.098 X-Spam-Level: X-Spam-Status: No, score=-2.098 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=unavailable autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=raszuk.net Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id UUF3ivW63rBm for ; Tue, 17 Nov 2020 00:36:36 -0800 (PST) Received: from mail-lj1-x22a.google.com (mail-lj1-x22a.google.com [IPv6:2a00:1450:4864:20::22a]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 3E5FE3A0962 for ; Tue, 17 Nov 2020 00:36:36 -0800 (PST) Received: by mail-lj1-x22a.google.com with SMTP id 142so9685498ljj.10 for ; Tue, 17 Nov 2020 00:36:36 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=raszuk.net; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=xtGyLHbO7W7YsReElMOXUbSPoTWWu52uMPz82P61Ri0=; b=IEda/ZAz+bC9572CFDD4BtwUE1KA7BvMCJpW/iupmzNtNfk/bdzoJwmtfQtvDNYK7Q Rn5pH5iTj+7eAbiXvQzmtPFuObYkKuimoUZU9BswW875hrvNMDIMwuzDSZSyhA04lT0k 2cKYyFyycIdgtLCQtipBvJHSJmOQf510lVU5d/tT1W8dBqqYbzm4hHOim8hwoCGG/akI 5Wn5a7T0rROGSkf9TJ6YpcrqjEfWPnGfL4GvwczI5XPHJ9ajbW345lVhFXUG4qolOU1R DKCPf6K47l1eUJpYyCf1DP3bBkweOANIIaGyPZwnSd6vUVoED8DU8AdBFdw0TX1HETL8 vkhQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=xtGyLHbO7W7YsReElMOXUbSPoTWWu52uMPz82P61Ri0=; b=rURPTDXFm2rWQyA21a+UZWYEKJbBLlTNmv8o5aKvRirzW4s45WOYx6vy3FgUSWzM1B 7IljcwPZbhL7SdN0btlz9OLLYdV9gjr91oId9tF/3dXPXSR55COJk3n9l1TmpE9V4bWN yqKreGAdlWqRnRm5Or0QzgmuG/mH+dqnQcIh5udjGO2PYQ5oyM7PG8zonMyCtNDmowEO 8N4+UG60d4So2BoHh9li4sbwDVAZSiUhOX6H3qZGWEFK4mHhhdRlguylfXahKP2++RCk tCWsaRHvjLxlCiM0sLds/D+lQIYsFTFUPyYOVmC3tE1aEfbwNB2BdqAiU/MeJf6CCz7m WAAw== X-Gm-Message-State: AOAM530aaAJM17uN2XeLfuL4cLMDQ7EaSgsBa8b6aQecspUV0j+tFVuY KuEDNlMLcm+UaHG8yoaAciRsM7D0Mj938nkf+Pdbag== X-Google-Smtp-Source: ABdhPJymJq4bZIzOmm4pM2FUAlw8EXavhJyH2LZbLeAQp2rL4jppTZ4qU0TcrtQ4M9OdqFYlbdIfxRXERp9PPeZvGBo= X-Received: by 2002:a2e:8792:: with SMTP id n18mr1540216lji.57.1605602194356; Tue, 17 Nov 2020 00:36:34 -0800 (PST) MIME-Version: 1.0 References: <016b01d6bca9$cf908c20$6eb1a460$@tsinghua.org.cn> In-Reply-To: From: Robert Raszuk Date: Tue, 17 Nov 2020 09:36:24 +0100 Message-ID: To: Gyan Mishra Cc: Aijun Wang , lsr , Jeff Tantsura , "Acee Lindem (acee)" Content-Type: multipart/alternative; boundary="00000000000072151a05b44964eb" Archived-At: Subject: Re: [Lsr] Prefix Unreachable Announcement Use Cases X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 17 Nov 2020 08:36:39 -0000 --00000000000072151a05b44964eb Content-Type: text/plain; charset="UTF-8" Robert, I believe the original intention was related to having the data > plane converge quickly when summarization is used and flip so traffic > converges from the Active ABR to the Backup ABR. > I do not buy this use case. Flooding within the area is fast such that both ABRs will get the same info. As mentioned before there is no practical use of PUA for making any routing or fwd decision on which ABR to use. If your ABRs are not connected with min redundancy this draft is a worst patch ever to work around such a design. Please present us a picture indicating before and after ABRs behaviour. However PUA can be used in the absence of area segmentation within a > single area when a link or node fails to converge the data plane quickly by > sending PUA for the backup path so the active path. > If there is no area segmentation then there is no summaries. So what are we missing in the first place ? > With the IGP tuned with BFD fast detection on ISIS or OSPF links and LFA & > RLFA for MPLS or TI-LFA for SR local protection - with those tweaks the > convergence is well into sub second. So for Intra area convergence with > all the optimizations mentioned I am not sure how much faster the data > plane will converge with PUA. > Even without any of the above listed chain of acronymous things will generally work well intra-area without PUAs. Thx, R. --00000000000072151a05b44964eb Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable


=C2=A0 =C2=A0Robe= rt, I believe the original intention was related to having the data plane c= onverge quickly when summarization is used and flip so traffic converges fr= om the Active ABR to the Backup ABR.=C2=A0

I do not buy this use case. Flooding within the area is f= ast such that both ABRs will get the same info. As mentioned before there i= s no practical use of PUA for making any routing or fwd decision on which A= BR to use. If your ABRs are not connected with min redundancy this draft is= a worst patch ever to work around such a design.=C2=A0

Please present us a picture indicating before and after ABRs behaviou= r.=C2=A0

=C2=A0 =C2=A0However P= UA can be used in the absence of area segmentation within a single area whe= n a link or node fails to converge the data plane quickly by sending PUA fo= r the backup path so the active path.=C2=A0

If there is no area segmentation then there is no su= mmaries. So what are we missing in the first place ?=C2=A0

=C2=A0
=
With the IGP tuned with BF= D fast detection on ISIS or OSPF links and LFA & RLFA for MPLS or TI-LF= A for SR local protection - with those tweaks the convergence is well into = sub second.=C2=A0 So for Intra area convergence with all the optimizations = mentioned I am not sure how much faster the data plane will converge with P= UA.

Even without any of t= he above listed chain of acronymous things will generally work well intra-a= rea without PUAs.=C2=A0

Thx,
R.

<= /div>

--00000000000072151a05b44964eb-- From nobody Tue Nov 17 01:02:01 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 07FD03A0A4F for ; Tue, 17 Nov 2020 01:02:00 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.087 X-Spam-Level: X-Spam-Status: No, score=-2.087 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_REMOTE_IMAGE=0.01, URIBL_BLOCKED=0.001] autolearn=unavailable autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id DS5vk5hGYJT7 for ; Tue, 17 Nov 2020 01:01:58 -0800 (PST) Received: from mail-pj1-x1030.google.com (mail-pj1-x1030.google.com [IPv6:2607:f8b0:4864:20::1030]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 1C94E3A0A42 for ; Tue, 17 Nov 2020 01:01:58 -0800 (PST) Received: by mail-pj1-x1030.google.com with SMTP id gv24so93719pjb.3 for ; Tue, 17 Nov 2020 01:01:58 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=kqX1C1qFnMsdUnAF4iAKroZeMmr+DlCLmUdCntIp5jo=; b=i60QjX8Vfw+cNGiuwdL2a/o+GzlELrzMTWqmkpdTkc0pnIWYcoWa/QWPB9SAu+LUB/ HWFuI//K4rpAYWHMC8JAEaPe1mgLGpDs2znEHn7OvTHgBFvbp9qTs/0fATAydBZzVanE faL5QI9fsFohDih399EI4UCH+qryBvDLSS3KW/9PRF9GYkFPoejMc6OJZ3/O/r6NLzeL wq8AECBpVhssI+eF/VjLdO3RvutRDt9x36KKGdbiGY9XDe+AyDwOPWGmLzKXNLFn3P3H jDVmpwXZdWpwDHpx0/KEIq6D0TkTVKye11XoMSMtQSe+2ZSVKJSLBOBuXD8BWdvoowzR EgaA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=kqX1C1qFnMsdUnAF4iAKroZeMmr+DlCLmUdCntIp5jo=; b=cF9TI2xCp1j+QwJidVDEOiSAY16HcVNwBseOuj1mXfp/YWn6f18DLcTEVQjbOuQu+x byPU0zIRG7OVomwZIs0tzVc/oMmizMXymVcPmnvXftgEP3ggZ3dFn0hSonfNNqTZHwDu m9MvO/Bz/WgksgMIWjc1GMz8zZLgUBQrd4v9gCpSobGOk2r3XgbGA2gLJM13m4YGBcxK BcmaIVu9UMbITeopK8RbtsYEBqs6mAvW8vxd+m9sQ8oNffAAKECYcHIBZLwajuYBDAra axPsezQmqrINub8UaKr47S9wzyPXdxrMsznWiPCuD/7c6svHVLQg3nxsWcTGJiRMM1m6 D5Mg== X-Gm-Message-State: AOAM530jQeBev+CXHobXSLaun5VNZUVBC0FRnLcG1tSbicuSrCRCvEMt ZMrB1Eehl03do4AEJN6iQMylJyDSvFqU3FxEC9M= X-Google-Smtp-Source: ABdhPJzEdgf8W38N5jELnX2eXe/+jQyLdx2ZHdCBwC2ul1PzOdgnZ8pBE4uVbNa6SXXT3u7Tt/P51l8bm9ZFIMdwoEA= X-Received: by 2002:a17:90a:178b:: with SMTP id q11mr3474510pja.132.1605603717408; Tue, 17 Nov 2020 01:01:57 -0800 (PST) MIME-Version: 1.0 References: <016b01d6bca9$cf908c20$6eb1a460$@tsinghua.org.cn> In-Reply-To: From: Gyan Mishra Date: Tue, 17 Nov 2020 04:01:46 -0500 Message-ID: To: Robert Raszuk Cc: "Acee Lindem (acee)" , Aijun Wang , Jeff Tantsura , lsr Content-Type: multipart/alternative; boundary="00000000000039ecf905b449bf8e" Archived-At: Subject: Re: [Lsr] Prefix Unreachable Announcement Use Cases X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 17 Nov 2020 09:02:00 -0000 --00000000000039ecf905b449bf8e Content-Type: text/plain; charset="UTF-8" On Tue, Nov 17, 2020 at 3:36 AM Robert Raszuk wrote: > > > Robert, I believe the original intention was related to having the data >> plane converge quickly when summarization is used and flip so traffic >> converges from the Active ABR to the Backup ABR. >> > > I do not buy this use case. Flooding within the area is fast such that > both ABRs will get the same info. As mentioned before there is no practical > use of PUA for making any routing or fwd decision on which ABR to use. If > your ABRs are not connected with min redundancy this draft is a worst patch > ever to work around such a design. > Gyan> Agreed. The point of PUA in ABR use case is the ability to track the component prefixes and in case where component is down and traffic is still forwarded to the ABR and dropped. The other more important use case is when links are down within the area and the area is partitioned and so one ABR has all component prefixes however other ABR is missing half the component prefixes. So since the ABR will by default advertise the summary as long as their is one component UP the summary is still advertised. So this use case is severely impacting as now you have an ECMP path to the other area for the summary via the two ABRs and you drop half your traffic. So now with PUA the problem is fixed and the PUA is sent and now traffic is only sent to the ABR that has the component prefixes. > > Please present us a picture indicating before and after ABRs behaviour. > Gyan> will do > > However PUA can be used in the absence of area segmentation within a >> single area when a link or node fails to converge the data plane quickly by >> sending PUA for the backup path so the active path. >> > > If there is no area segmentation then there is no summaries. So what are > we missing in the first place ? > Gyan> Sorry I am stating that PUA feature can also be used intra area where if a link or node goes down to improve data plane convergence. > > > >> With the IGP tuned with BFD fast detection on ISIS or OSPF links and LFA >> & RLFA for MPLS or TI-LFA for SR local protection - with those tweaks the >> convergence is well into sub second. So for Intra area convergence with >> all the optimizations mentioned I am not sure how much faster the data >> plane will converge with PUA. >> > > Even without any of the above listed chain of acronymous things will > generally work well intra-area without PUAs. > Gyan> Agreed which is why I mentioned the BGP next hop self use case if I could figure out how PUA could help there that would be a major benefit of PUA. > > Thx, > R. > > > -- *Gyan Mishra* *Network Solutions A**rchitect * *M 301 502-134713101 Columbia Pike *Silver Spring, MD --00000000000039ecf905b449bf8e Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable


On Tue, Nov 17, 2020 at 3:36 AM Robert Raszuk <robert@raszuk.net> wrote:


=
=C2=A0 =C2=A0Robert, I believe the original intention was relate= d to having the data plane converge quickly when summarization is used and = flip so traffic converges from the Active ABR to the Backup ABR.=C2=A0

I do not buy this use case. F= looding within the area is fast such that both ABRs will get the same info.= As mentioned before there is no practical use of PUA for making any routin= g or fwd decision on which ABR to use. If your ABRs are not connected with = min redundancy this draft is a worst patch ever to work around such a desig= n.=C2=A0

=C2=A0 =C2=A0Gyan> Agreed.=C2=A0 The point of PUA in ABR use c= ase is the ability to track the component prefixes and in case where compon= ent is down and traffic is still forwarded to the ABR and dropped.=C2=A0 Th= e other more important use case is when links are down within the area and = the area is partitioned and so one ABR has all component prefixes however o= ther ABR is missing half the component prefixes.=C2=A0 So since the ABR wil= l by default advertise the summary as long as their is one component UP the= summary is still advertised.=C2=A0 So this use case is severely impacting = as now you have an ECMP path to the other area for the summary via the two = ABRs and you drop half your traffic.=C2=A0 So now with PUA the problem is f= ixed and the PUA is sent and now traffic is only sent to the ABR that has t= he component prefixes.

Ple= ase present us a picture indicating before and after ABRs behaviour.=C2=A0<= /div>

=C2=A0 =C2=A0 =C2=A0Gyan> will do=C2=A0

=C2=A0 =C2=A0However PUA can be used i= n the absence of area segmentation within a single area when a link or node= fails to converge the data plane quickly by sending PUA for the backup pat= h so the active path.=C2=A0

If there is no area segmentation then there is no summaries. So what= are we missing in the first place ?=C2=A0

=C2=A0 =C2=A0 Gyan> Sorry I = am stating that PUA feature can also be used intra area where if a link or = node goes down to improve data plane convergence.

=C2=A0
With the IG= P tuned with BFD fast detection on ISIS or OSPF links and LFA & RLFA fo= r MPLS or TI-LFA for SR local protection - with those tweaks the convergenc= e is well into sub second.=C2=A0 So for Intra area convergence with all the= optimizations mentioned I am not sure how much faster the data plane will = converge with PUA.

Even w= ithout any of the above listed chain of acronymous things will generally wo= rk well intra-area without PUAs.=C2=A0

=C2=A0 =C2=A0 Gyan> A= greed which is why I mentioned the BGP next hop self use case if I could fi= gure out how PUA could help there that would be a major benefit of PUA.

Thx,
R.


<= /div>
--
--00000000000039ecf905b449bf8e-- From nobody Tue Nov 17 02:30:56 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 759AA3A0E8A for ; Tue, 17 Nov 2020 02:30:54 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.896 X-Spam-Level: X-Spam-Status: No, score=-1.896 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id iueIkqp9BwlF for ; Tue, 17 Nov 2020 02:30:52 -0800 (PST) Received: from frasgout.his.huawei.com (frasgout.his.huawei.com [185.176.79.56]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id C2B5A3A0E84 for ; Tue, 17 Nov 2020 02:30:51 -0800 (PST) Received: from fraeml711-chm.china.huawei.com (unknown [172.18.147.226]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4Cb2H15ZRHz67Df6 for ; Tue, 17 Nov 2020 18:29:01 +0800 (CST) Received: from fraeml711-chm.china.huawei.com (10.206.15.60) by fraeml711-chm.china.huawei.com (10.206.15.60) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1913.5; Tue, 17 Nov 2020 11:30:50 +0100 Received: from DGGEML421-HUB.china.huawei.com (10.1.199.38) by fraeml711-chm.china.huawei.com (10.206.15.60) with Microsoft SMTP Server (version=TLS1_0, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA) id 15.1.1913.5 via Frontend Transport; Tue, 17 Nov 2020 11:30:49 +0100 Received: from DGGEML524-MBX.china.huawei.com ([169.254.1.26]) by dggeml421-hub.china.huawei.com ([10.1.199.38]) with mapi id 14.03.0487.000; Tue, 17 Nov 2020 18:30:46 +0800 From: wangyali To: Huaimo Chen , "lsr@ietf.org" Thread-Topic: [Lsr] New Version for draft-wang-lsr-hbh-process-00 Thread-Index: Adat8djmk+9JGVIhQXKR+qlyxbtz5wOqvcqj///ZrVA= Date: Tue, 17 Nov 2020 10:30:45 +0000 Message-ID: <1520992FC97B944A9979C2FC1D7DB0F4050C4062@dggeml524-mbx.china.huawei.com> References: <1520992FC97B944A9979C2FC1D7DB0F4050519D2@dggeml524-mbx.china.huawei.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.108.243.136] Content-Type: multipart/alternative; boundary="_000_1520992FC97B944A9979C2FC1D7DB0F4050C4062dggeml524mbxchi_" MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: Re: [Lsr] New Version for draft-wang-lsr-hbh-process-00 X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 17 Nov 2020 10:30:55 -0000 --_000_1520992FC97B944A9979C2FC1D7DB0F4050C4062dggeml524mbxchi_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi Huaimo, Thanks a lot for your review and comments. Please find my responses in line= [Yali]. Best regards, Yali From: Huaimo Chen [mailto:huaimo.chen@futurewei.com] Sent: Tuesday, November 17, 2020 12:59 PM To: wangyali ; lsr@ietf.org Subject: Re: [Lsr] New Version for draft-wang-lsr-hbh-process-00 Hi Authors, The draft describes extensions to IGP for a node to distribute capabilities of its links. The capability information about all the links in a network may be used by another entity such as a controller. I have following comments: 1). In section 3, the capabilities of a link or a node is represented by "Processing Action" (refer to Fig. 1 in the draft). Why do you include "Max EH Len" in the "Processing Action"? It is not a capability. [Yali] Since the length of IPv6 Extensions Header exceeds the maximum limit= the node is capable to process, the packets carried extensions header shou= ld be discarded. Hence, "Max EH Len" defined in this draft is used to indic= ate the maximum length of extension header supported by the Node or Link. S= o I think it is also a capability. What's your thoughts? 2). The text describing the format of "Processing Action" below seems not consistent with the format in Fig. 1. "... processing action formed of a tuple of a 1-octet Extension Header Options identifier and 8-bit Processing Action Flag." The above text occurs twice in the draft. [Yali] I'll fix this in the next version. It should be "...processing actio= n formed of a tuple of a 8-bit Processing Action Flag, a 16-bit Services Fl= ag, and a one-octet Maximum Extensions Header Length." 3). It seems that using word "signal" or "signaling" in the draft is not good. It is better to use another word and rephrase the related text= . [Yali] I will replace word "signal" by "advertise" and also revise the rela= ted text. Is it correct? Best Regards, Huaimo ________________________________ From: Lsr > on behalf of = wangyali > Sent: Thursday, October 29, 2020 9:19 AM To: lsr@ietf.org > Subject: [Lsr] New Version for draft-wang-lsr-hbh-process-00 Hello WG, Considering the Hop-by-Hop Options header has been used for IOAM [I-D.ietf-= ippm-ioam-ipv6-options], Alternate Marking method [I-D.ietf-6man-ipv6-alt-m= ark], etc., but as specified in RFC8200, the Hop-by-Hop Options header is o= nly examined and processed if it is explicitly configured. In this case, no= des may be configured to ignore the Hop-by-Hop Options header, drop packets= containing a Hop-by-Hop Options header, or assign packets containing a Hop= -by-Hop Options header to a slow processing path. Thus, the performance mea= surement does not account for all links and nodes along a path. In addition= , packets carrying a Hop-by-Hop Options header may be dropped, which gravel= y deteriorates network performance. Therefore, we propose a new draft about IGP extensions for signaling Hop-by= -Hop Options header processing action at node and link granularity. Such ad= vertisement is useful for entities (e.g., the centralized controller) to ga= ther each router's processing action for achieving the computation of TE pa= ths that be able to support a specific service encoded in the Hop-by-Hop Op= tions header. Please let us know your opinion. Questions and comments are very welcome. Best regards, Yali -----Original Message----- From: internet-drafts@ietf.org [mailto:int= ernet-drafts@ietf.org] Sent: Thursday, October 29, 2020 8:42 PM To: Tianran Zhou >; H= uzhibo >; wangyali > Subject: New Version Notification for draft-wang-lsr-hbh-process-00.txt A new version of I-D, draft-wang-lsr-hbh-process-00.txt has been successful= ly submitted by Yali Wang and posted to the IETF repository. Name: draft-wang-lsr-hbh-process Revision: 00 Title: IGP Extensions for Advertising Hop-by-Hop Options Header Pr= ocessing Action Document date: 2020-10-29 Group: Individual Submission Pages: 10 URL: https://nam11.safelinks.protection.outlook.com/?url=3Dhttps= %3A%2F%2Fwww.ietf.org%2Farchive%2Fid%2Fdraft-wang-lsr-hbh-process-00.txt&am= p;data=3D04%7C01%7Chuaimo.chen%40futurewei.com%7C1b6010e28c9345df423708d87c= 0d5f8f%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C1%7C637395744183598793%7CUn= known%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJ= XVCI6Mn0%3D%7C2000&sdata=3DtvJH5rnR%2BAj%2FxTTaxxbKJ6z%2F1OKAog3QdCCJnJ= kKB2I%3D&reserved=3D0 Status: https://nam11.safelinks.protection.outlook.com/?url=3Dhttps= %3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fdraft-wang-lsr-hbh-process%2F&dat= a=3D04%7C01%7Chuaimo.chen%40futurewei.com%7C1b6010e28c9345df423708d87c0d5f8= f%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C1%7C637395744183598793%7CUnknown= %7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6= Mn0%3D%7C2000&sdata=3DWt7W0PL8HGI1EaPK8sV92RWIRGXATD0RGx1AhGIH6xk%3D&am= p;reserved=3D0 Htmlized: https://nam11.safelinks.protection.outlook.com/?url=3Dhttps= %3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fhtml%2Fdraft-wang-lsr-hbh-process&= ;data=3D04%7C01%7Chuaimo.chen%40futurewei.com%7C1b6010e28c9345df423708d87c0= d5f8f%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C1%7C637395744183598793%7CUnk= nown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJX= VCI6Mn0%3D%7C2000&sdata=3DZmi3lDpE2aNulJxCiyU%2B9XQzv63EPeMo%2BAWVkatiD= RE%3D&reserved=3D0 Htmlized: https://nam11.safelinks.protection.outlook.com/?url=3Dhttps= %3A%2F%2Ftools.ietf.org%2Fhtml%2Fdraft-wang-lsr-hbh-process-00&data=3D0= 4%7C01%7Chuaimo.chen%40futurewei.com%7C1b6010e28c9345df423708d87c0d5f8f%7C0= fee8ff2a3b240189c753a1d5591fedc%7C1%7C1%7C637395744183598793%7CUnknown%7CTW= FpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3= D%7C2000&sdata=3Dm9Z1uy3W4tT73SQod1DpcT%2BU4malMI25xQtNHTSwkdY%3D&r= eserved=3D0 Abstract: This document extends Node and Link attribute TLVs to Interior Gateway Protocols (IGP) to advertise the Hop-by-Hop Options header processing action and supported services (e.g. IOAM Trace Option and Alternate Marking) at node and link granularity. Such advertisements allow entities (e.g., centralized controllers) to determine whether the Hop-by-Hop Options header and specific services can be supported in a given network. Please note that it may take a couple of minutes from the time of submissio= n until the htmlized version and diff are available at tools.ietf.org. 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fraeml706-chm.china.huawei.com (10.206.15.55) by fraeml706-chm.china.huawei.com (10.206.15.55) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1913.5; Tue, 17 Nov 2020 13:11:23 +0100 Received: from DGGEML402-HUB.china.huawei.com (10.3.17.38) by fraeml706-chm.china.huawei.com (10.206.15.55) with Microsoft SMTP Server (version=TLS1_0, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA_P256) id 15.1.1913.5 via Frontend Transport; Tue, 17 Nov 2020 13:11:23 +0100 Received: from DGGEML524-MBX.china.huawei.com ([169.254.1.26]) by DGGEML402-HUB.china.huawei.com ([fe80::fca6:7568:4ee3:c776%31]) with mapi id 14.03.0487.000; Tue, 17 Nov 2020 20:11:16 +0800 From: wangyali To: "lsr@ietf.org" Thread-Topic: Discussion on draft-wang-lsr-hbh-process-00 Thread-Index: Ada82OyMvrt+bmvfQAirzZLC7BtpUQ== Date: Tue, 17 Nov 2020 12:11:16 +0000 Message-ID: <1520992FC97B944A9979C2FC1D7DB0F4050C4193@dggeml524-mbx.china.huawei.com> Accept-Language: en-US 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Raszuk Cc: "Acee Lindem (acee)" , Aijun Wang , Jeff Tantsura , lsr Content-Type: multipart/alternative; boundary="000000000000919dd705b44e5084" Archived-At: Subject: Re: [Lsr] Prefix Unreachable Announcement Use Cases X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 17 Nov 2020 14:28:58 -0000 --000000000000919dd705b44e5084 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, Nov 17, 2020 at 4:01 AM Gyan Mishra wrote: > > > On Tue, Nov 17, 2020 at 3:36 AM Robert Raszuk wrote: > >> >> >> Robert, I believe the original intention was related to having the >>> data plane converge quickly when summarization is used and flip so traf= fic >>> converges from the Active ABR to the Backup ABR. >>> >> >> I do not buy this use case. Flooding within the area is fast such that >> both ABRs will get the same info. As mentioned before there is no practi= cal >> use of PUA for making any routing or fwd decision on which ABR to use. I= f >> your ABRs are not connected with min redundancy this draft is a worst pa= tch >> ever to work around such a design. >> > > Gyan> Agreed. The point of PUA in ABR use case is the ability to trac= k > the component prefixes and in case where component is down and traffic is > still forwarded to the ABR and dropped. The other more important use cas= e > is when links are down within the area and the area is partitioned and so > one ABR has all component prefixes however other ABR is missing half the > component prefixes. So since the ABR will by default advertise the summa= ry > as long as their is one component UP the summary is still advertised. So > this use case is severely impacting as now you have an ECMP path to the > other area for the summary via the two ABRs and you drop half your > traffic. So now with PUA the problem is fixed and the PUA is sent and no= w > traffic is only sent to the ABR that has the component prefixes. > >> >> Please present us a picture indicating before and after ABRs behaviour. >> > > Gyan> will do > >> >> However PUA can be used in the absence of area segmentation within a >>> single area when a link or node fails to converge the data plane quickl= y by >>> sending PUA for the backup path so the active path. >>> >> >> If there is no area segmentation then there is no summaries. So what are >> we missing in the first place ? >> > > Gyan> Sorry I am stating that PUA feature can also be used intra area > where if a link or node goes down to improve data plane convergence. > >> >> >> >>> With the IGP tuned with BFD fast detection on ISIS or OSPF links and LF= A >>> & RLFA for MPLS or TI-LFA for SR local protection - with those tweaks t= he >>> convergence is well into sub second. So for Intra area convergence wit= h >>> all the optimizations mentioned I am not sure how much faster the data >>> plane will converge with PUA. >>> >> >> Even without any of the above listed chain of acronymous things will >> generally work well intra-area without PUAs. >> > > Gyan> Agreed which is why I mentioned the BGP next hop self use case > if I could figure out how PUA could help there that would be a major > benefit of PUA. > Gyan>. We could use Aijun=E2=80=99s passive interface new top level T= LV to link the next hop rewrite loopback to the PE-CE links all being set to passive. So if any PE-CE link goes down a PUA is sent and the next hop converges PIC core PE-CE link which is now associated with the Loopback. This would be a major benefit of PUA for PIC core convergence when next-hop-self is used which applies to MPLS and SR and IP based core. https://datatracker.ietf.org/doc/draft-wang-lsr-passive-interface-attribute= / So the two main critical use cases where this solution solves a problem is partitioned area scenario and nest hop convergence when next-hop-self is used scenario. I will update the presentation deck and share. >> Thx, >> R. >> >> >> -- > > > > *Gyan Mishra* > > *Network Solutions A**rchitect * > > > > *M 301 502-134713101 Columbia Pike *Silver Spring, MD > > -- *Gyan Mishra* *Network Solutions A**rchitect * *M 301 502-134713101 Columbia Pike *Silver Spring, MD --000000000000919dd705b44e5084 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable


On Tue, Nov 17, 2020 at 4:01 AM Gyan Mishra <hayabusagsm@gmail.com> wrote:


On Tue, Nov 17, 2020 at 3:36 AM Robert Rasz= uk <robert@raszuk= .net> wrote:


=C2= =A0 =C2=A0Robert, I believe the original intention was related to having th= e data plane converge quickly when summarization is used and flip so traffi= c converges from the Active ABR to the Backup ABR.=C2=A0
<= /blockquote>

I do not buy this use case. Flooding within= the area is fast such that both ABRs will get the same info. As mentioned = before there is no practical use of PUA for making any routing or fwd decis= ion on which ABR to use. If your ABRs are not connected with min redundancy= this draft is a worst patch ever to work around such a design.=C2=A0
=

=C2= =A0 =C2=A0Gyan> Agreed.=C2=A0 The point of PUA in ABR use case is the ab= ility to track the component prefixes and in case where component is down a= nd traffic is still forwarded to the ABR and dropped.=C2=A0 The other more = important use case is when links are down within the area and the area is p= artitioned and so one ABR has all component prefixes however other ABR is m= issing half the component prefixes.=C2=A0 So since the ABR will by default = advertise the summary as long as their is one component UP the summary is s= till advertised.=C2=A0 So this use case is severely impacting as now you ha= ve an ECMP path to the other area for the summary via the two ABRs and you = drop half your traffic.=C2=A0 So now with PUA the problem is fixed and the = PUA is sent and now traffic is only sent to the ABR that has the component = prefixes.

Please present us a picture in= dicating before and after ABRs behaviour.=C2=A0

=C2=A0 =C2=A0 =C2=A0Gyan&g= t; will do=C2=A0

=C2=A0 =C2=A0However PUA can be used = in the absence of area segmentation within a single area when a link or nod= e fails to converge the data plane quickly by sending PUA for the backup pa= th so the active path.=C2=A0

If there is no area segmentation then there is no summaries. So wha= t are we missing in the first place ?=C2=A0
<= div dir=3D"auto">
=C2=A0 =C2=A0 Gyan> Sorry I= am stating that PUA feature can also be used intra area where if a link or= node goes down to improve data plane convergence.
=
=C2=A0
With the IGP tuned with BFD fast detection on ISIS or= OSPF links and LFA & RLFA for MPLS or TI-LFA for SR local protection -= with those tweaks the convergence is well into sub second.=C2=A0 So for In= tra area convergence with all the optimizations mentioned I am not sure how= much faster the data plane will converge with PUA.

Even without any of the above listed chain of ac= ronymous things will generally work well intra-area without PUAs.=C2=A0

=C2=A0 =C2=A0 Gyan> Agreed which is why I mentioned the BGP ne= xt hop self use case if I could figure out how PUA could help there that wo= uld be a major benefit of PUA.

Hi Huaimo,

 

Thanks a lot for your review and comm= ents. Please find my responses in line [Yali].

 

Best regards,

Yali

 

From: Huaimo Chen [mailto:huaimo.che= n@futurewei.com]
Sent: Tuesday, November 17, 2020 12:59 PM
To: wangyali <wangyali11@huawei.com>; lsr@ietf.org
Subject: Re: [Lsr] New Version for draft-wang-lsr-hbh-process-00

 

Hi Authors,

 

    The draft describes extensions to IGP for = a node to distribute

capabilities of its links. The capability information ab= out

all the links in a network may be used by another entity= such as 

a controller.

 

I have following comments:

1). In section 3, the capabilities of a link or a node i= s represented

by "Processing Action" (refer to Fig. 1 in the= draft). Why do you include

"Max EH Len" in the "Processing Action&qu= ot;? It is not a capability.

[Yali] Since the length of IPv6 Exten= sions Header exceeds the maximum limit the node is capable to process, the = packets carried extensions header should be discarded. Hence, “Max EH Len” defined in this draft is used to indicate = the maximum length of extension header supported by the Node or Link. So I = think it is also a capability.

What’s your thoughts?

 

2). The text describing the format of "Processing A= ction"

below seems not consistent with the format in Fig. 1.

"... processing action formed of<= /p>

a tuple of a 1-octet Extension Header Options identifier= and 8-bit

Processing Action Flag."

The above text occurs twice in the draft.

[Yali] I’ll fix this in the nex= t version. It should be “…processing action formed of a tuple o= f a 8-bit Processing Action Flag, a 16-bit Services Flag, and a one-octet Maximum Extensions Header Length.”

 

3). It seems that using word "signal" or "= ;signaling" in the draft

is not good. It is better to use another word and rephra= se the related text.

[Yali] I will replace word “sig= nal” by “advertise” and also revise the related text. Is = it correct?

 

Best Regards,

Huaimo

From: Lsr &l= t;lsr-bounces@ietf.org> on behalf of wangyali <wangyal= i11@huawei.com>
Sent: Thursday, October 29, 2020 9:19 AM
To: lsr@ietf.org <lsr@ietf.org>
Subject: [Lsr] New Version for draft-wang-lsr-hbh-process-00 =

 

Hello WG,

Considering the Hop-by-Hop Options header has been used for IOAM [I-D.ietf-= ippm-ioam-ipv6-options], Alternate Marking method [I-D.ietf-6man-ipv6-alt-m= ark], etc., but as specified in RFC8200, the Hop-by-Hop Options header is o= nly examined and processed if it is explicitly configured. In this case, nodes may be configured to ignore = the Hop-by-Hop Options header, drop packets containing a Hop-by-Hop Options= header, or assign packets containing a Hop-by-Hop Options header to a slow= processing path. Thus, the performance measurement does not account for all links and nodes along a path. In addi= tion, packets carrying a Hop-by-Hop Options header may be dropped, which gr= avely deteriorates network performance.

Therefore, we propose a new draft about IGP extensions for signaling Hop-by= -Hop Options header processing action at node and link granularity. Such ad= vertisement is useful for entities (e.g., the centralized controller) to ga= ther each router's processing action for achieving the computation of TE paths that be able to support a specif= ic service encoded in the Hop-by-Hop Options header.

Please let us know your opinion. Questions and comments are very welcome.
Best regards,
Yali


-----Original Message-----
From: internet-drafts@ietf.org<= /a> [mailto:internet-drafts@iet= f.org]
Sent: Thursday, October 29, 2020 8:42 PM
To: Tianran Zhou <zhoutianran@= huawei.com>; Huzhibo <huzhi= bo@huawei.com>; wangyali <wangyali11@huawei.com>
Subject: New Version Notification for draft-wang-lsr-hbh-process-00.txt


A new version of I-D, draft-wang-lsr-hbh-process-00.txt has been successful= ly submitted by Yali Wang and posted to the IETF repository.

Name:           draft-wan= g-lsr-hbh-process
Revision:       00
Title:          IGP Extensions= for Advertising Hop-by-Hop Options Header Processing Action
Document date:  2020-10-29
Group:          Individual Sub= mission
Pages:          10
URL:            https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fwww.iet= f.org%2Farchive%2Fid%2Fdraft-wang-lsr-hbh-process-00.txt&amp;data=3D04%= 7C01%7Chuaimo.chen%40futurewei.com%7C1b6010e28c9345df423708d87c0d5f8f%7C0fe= e8ff2a3b240189c753a1d5591fedc%7C1%7C1%7C637395744183598793%7CUnknown%7CTWFp= bGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%= 7C2000&amp;sdata=3DtvJH5rnR%2BAj%2FxTTaxxbKJ6z%2F1OKAog3QdCCJnJkKB2I%3D= &amp;reserved=3D0
Status:         https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fdatatra= cker.ietf.org%2Fdoc%2Fdraft-wang-lsr-hbh-process%2F&amp;data=3D04%7C01%= 7Chuaimo.chen%40futurewei.com%7C1b6010e28c9345df423708d87c0d5f8f%7C0fee8ff2= a3b240189c753a1d5591fedc%7C1%7C1%7C637395744183598793%7CUnknown%7CTWFpbGZsb= 3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C200= 0&amp;sdata=3DWt7W0PL8HGI1EaPK8sV92RWIRGXATD0RGx1AhGIH6xk%3D&amp;re= served=3D0
Htmlized:       https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fdatatra= cker.ietf.org%2Fdoc%2Fhtml%2Fdraft-wang-lsr-hbh-process&amp;data=3D04%7= C01%7Chuaimo.chen%40futurewei.com%7C1b6010e28c9345df423708d87c0d5f8f%7C0fee= 8ff2a3b240189c753a1d5591fedc%7C1%7C1%7C637395744183598793%7CUnknown%7CTWFpb= GZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7= C2000&amp;sdata=3DZmi3lDpE2aNulJxCiyU%2B9XQzv63EPeMo%2BAWVkatiDRE%3D&am= p;amp;reserved=3D0
Htmlized:       https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Ftools.i= etf.org%2Fhtml%2Fdraft-wang-lsr-hbh-process-00&amp;data=3D04%7C01%7Chua= imo.chen%40futurewei.com%7C1b6010e28c9345df423708d87c0d5f8f%7C0fee8ff2a3b24= 0189c753a1d5591fedc%7C1%7C1%7C637395744183598793%7CUnknown%7CTWFpbGZsb3d8ey= JWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C2000&= ;amp;sdata=3Dm9Z1uy3W4tT73SQod1DpcT%2BU4malMI25xQtNHTSwkdY%3D&amp;reser= ved=3D0


Abstract:
   This document extends Node and Link attribute TLVs to Interior=
   Gateway Protocols (IGP) to advertise the Hop-by-Hop Options he= ader
   processing action and supported services (e.g.  IOAM Trac= e Option and
   Alternate Marking) at node and link granularity.  Such ad= vertisements
   allow entities (e.g., centralized controllers) to determine wh= ether
   the Hop-by-Hop Options header and specific services can be sup= ported
   in a given network.


            &nb= sp;            =             &nb= sp;            =             &nb= sp;            =       


Please note that it may take a couple of minutes from the time of submissio= n until the htmlized version and diff are available at tools.ietf.org.

The IETF Secretariat


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=C2=A0 =C2=A0 =C2=A0 Gyan>. We could use= Aijun=E2=80=99s passive interface new top level TLV to link the next hop r= ewrite loopback to the PE-CE links all being set to passive. So if any PE-C= E link goes down a PUA is sent and the next hop converges PIC core PE-CE li= nk which is now associated with the Loopback.=C2=A0 This would be a major b= enefit of PUA for PIC core convergence when next-hop-self is used which app= lies to MPLS and SR and IP based core.


So the two main critical =C2=A0= use cases where this solution solves a problem is partitioned area scenario= and nest hop convergence when next-hop-self is used scenario.

I will update the presentation deck = and share.

=

Thx,
R.


--


Gyan Mishra

Network Solutions Architect=C2=A0

M 301 502-1347
13101 = Columbia Pike=C2=A0
Silver Spring, MD


--
--000000000000919dd705b44e5084-- From nobody Tue Nov 17 06:43:26 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 33E393A1014 for ; Tue, 17 Nov 2020 06:43:24 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.098 X-Spam-Level: X-Spam-Status: No, score=-2.098 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=unavailable autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=raszuk.net Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id rqUSJHnQRwMG for ; Tue, 17 Nov 2020 06:43:23 -0800 (PST) Received: from mail-lf1-x134.google.com (mail-lf1-x134.google.com [IPv6:2a00:1450:4864:20::134]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id C78923A13B6 for ; Tue, 17 Nov 2020 06:43:06 -0800 (PST) Received: by mail-lf1-x134.google.com with SMTP id s30so30440503lfc.4 for ; Tue, 17 Nov 2020 06:43:06 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=raszuk.net; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=vTVWQVw+tsTlv8vDxdylZhn9xMltTdT/Tx92i2/wOXM=; b=HsGgS/N1nKvMFqdRBKalcTplXuCvzZD4/ong3TUtx+pG8/oSO1QUL/aCzbU/3C9Je+ AFvRmXM0E6f4oaAUYnyqBJ3RJm99EvMszRXkFn24LQ9SECUEvmLeKL5SR194wLDFPT2K 2SxmV2cNd4aOIzzYDmLkaIKnXr7fEXcxEF7kTxgdPtji+K6qfHQwxJ74bbxsGi/6KZAH 69e1UnM71bh7f2yirW4HPvcUjeeNkTvUDHHVmVbOw1YcWi3p7wyVxnFqkT8PRfxWCbkn MS4nXAgSKhkcyem38KKquARVhUYtyoFN0acIBIgOX0z4laz6yqsrFU+2tKYvQ31xts6P TRvw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=vTVWQVw+tsTlv8vDxdylZhn9xMltTdT/Tx92i2/wOXM=; b=Vyn5FUYAAfulqcrICyYCEiE52DCEPJN7QnXURX2NKYj348LV80uMg17owJfeGzrePY ZBama1bKuh8JcCEqNnlk9vtiln0Dwaf3OZiZIuMDpz40OeXlZX9TFC1J+gBvDOjr+Vqc wMxkYCmpgOtovKv0qd3ODcb+dCaIgCpm774p/6vmAvxs5Z6qwNoRq/ON0kyF4CjEVDaJ 3lrIvfBB2dKZ8cFt8fl6PghTiK5++Ylz/1QPWmwJMmi6GPVJaM5bosyoeWHAesSPgyHf AxOb/L0rhvgvJIx2nmaqKZc59xTHaneXb6Ec9WIaK5MRqpZztRKy8QbFDOqBeZz6Ythb 826Q== X-Gm-Message-State: AOAM532H7FhJif6CYBWWi4HxVksbUztAKCkBlR+47c+1huFfBTFqwkbF Ae4KCj5J2zLs3A+vGMi2Oyrq8rba495XApxZxlxumA== X-Google-Smtp-Source: ABdhPJxvBldGdAi1yN+IM3dv4Wb0kiacDHrPKcsOxol4ty9i94nKyK4hsXiF+ft5qAwr03AgqlSsCstFJBMZB90ivNk= X-Received: by 2002:ac2:5219:: with SMTP id a25mr1933057lfl.264.1605624184754; Tue, 17 Nov 2020 06:43:04 -0800 (PST) MIME-Version: 1.0 References: <016b01d6bca9$cf908c20$6eb1a460$@tsinghua.org.cn> In-Reply-To: From: Robert Raszuk Date: Tue, 17 Nov 2020 15:42:54 +0100 Message-ID: To: Gyan Mishra Cc: "Acee Lindem (acee)" , Aijun Wang , Jeff Tantsura , lsr Content-Type: multipart/alternative; boundary="0000000000002ce95205b44e839b" Archived-At: Subject: Re: [Lsr] Prefix Unreachable Announcement Use Cases X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 17 Nov 2020 14:43:24 -0000 --0000000000002ce95205b44e839b Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi Gyan, Gyan>. We could use Aijun=E2=80=99s passive interface new top level T= LV to > link the next hop rewrite loopback to the PE-CE links all being set to > passive. So if any PE-CE link goes down a PUA is sent and the next hop > converges PIC core PE-CE link which is now associated with the Loopback. > This would be a major benefit of PUA for PIC core convergence when > next-hop-self is used which applies to MPLS and SR and IP based core. > I have read the above three sentences five times and came with two basic observations: * You are mixing PIC Core with PIC Edge - Please do not. Those are completely separate features and it is a feature not a bug to keep them that way. * You are mixing external PE-CE interfaces with IGP passive interfaces - Please do not. There should be no IGP flooding of any sort associated with state of PE-CE interface. No need. Thx a lot, R. --0000000000002ce95205b44e839b Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable --
Hi Gyan,

=C2=A0 =C2=A0 =C2=A0 Gyan>. We could use Aij= un=E2=80=99s passive interface new top level TLV to link the next hop rewri= te loopback to the PE-CE links all being set to passive. So if any PE-CE li= nk goes down a PUA is sent and the next hop converges PIC core PE-CE link w= hich is now associated with the Loopback.=C2=A0 This would be a major benef= it of PUA for PIC core convergence when next-hop-self is used which applies= to MPLS and SR and IP based core.

<= /div>
I have read the above three sentences five times and came with tw= o basic observations:=C2=A0

* You are mixing PIC C= ore with PIC Edge - Please=C2=A0do not. Those are completely separate featu= res and it is a feature not a bug to keep them that way.=C2=A0
* You are mixing external PE-CE interfaces with IGP passive in= terfaces - Please do not. There should be no IGP flooding of any sort assoc= iated=C2=A0with state of PE-CE interface. No need.=C2=A0

Thx a lot,
R.

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[67.169.103.239]) by smtp.gmail.com with ESMTPSA id f21sm19099884pga.32.2020.11.17.09.40.52 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Tue, 17 Nov 2020 09:40:52 -0800 (PST) Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 13.4 \(3608.120.23.2.4\)) From: Tony Li In-Reply-To: <1520992FC97B944A9979C2FC1D7DB0F4050C4193@dggeml524-mbx.china.huawei.com> Date: Tue, 17 Nov 2020 09:40:51 -0800 Cc: "lsr@ietf.org" Content-Transfer-Encoding: quoted-printable Message-Id: References: <1520992FC97B944A9979C2FC1D7DB0F4050C4193@dggeml524-mbx.china.huawei.com> To: wangyali X-Mailer: Apple Mail (2.3608.120.23.2.4) Archived-At: Subject: Re: [Lsr] Discussion on draft-wang-lsr-hbh-process-00 X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 17 Nov 2020 17:41:03 -0000 > Q1: are you using this information to determine the routing to the = network?=20 > On one hand, such advertisement does not effect on the normal SPF = computation and may be useful for traffic engineering. For example, for = IOAM service, if the HbH Processing Action of Node/Link is assigned to a = slow processing plane, the Node or Link should be excluded for path = computation. If the HbH Processing Action of Node/Link is ignore all = extension Options header, the Node/Link can be used as the normal IPv6 = transit node/link. If the HbH Processing Action of Node/Link is skip to = Next extension Options header (e.g. Routing Header), the Node/Link can = be considered as Endpoints in SRv6 routing. On the other hand, such = advertisement is useful for entities to determine specific services = encoded in HbH options header can be deployed in a given path. >=20 > Q2: can you use the link color to compute paths? > In the above, I answered, taking advantage of this advertisement, the = exact action taken by Node or Link to process HbH options header can be = determined (defined in Action Flag field), which can be useful for = traffic engineering. Hence, such advertisement is not only used to = determine whether the HbH options header supported by Node/Link or not. = But the link color cannot exactly indicate the exact action. This suggests that you=E2=80=99re missing one bit of information. Thus, = could you use two link colors to differentiate between the two? 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X-Google-Smtp-Source: ABdhPJx1TUCPawdwfneL1G7cFaHmgRp5ag5P9L8oUqGDdQP6ncYh1V+vJv7zcIqNVs+5t1kRCKgCfnB9d7rvtkutyfA= X-Received: by 2002:a17:902:6a84:b029:d8:c8a9:e04d with SMTP id n4-20020a1709026a84b02900d8c8a9e04dmr921484plk.74.1605640183791; Tue, 17 Nov 2020 11:09:43 -0800 (PST) MIME-Version: 1.0 References: <016b01d6bca9$cf908c20$6eb1a460$@tsinghua.org.cn> <32DFCE3A-D41C-48CA-928A-37011D158AEF@cisco.com> In-Reply-To: <32DFCE3A-D41C-48CA-928A-37011D158AEF@cisco.com> From: Gyan Mishra Date: Tue, 17 Nov 2020 14:09:32 -0500 Message-ID: To: "Acee Lindem (acee)" Cc: "Acee Lindem (acee)" , Aijun Wang , Jeff Tantsura , Robert Raszuk , lsr Content-Type: multipart/alternative; boundary="000000000000cac45905b4523ce4" Archived-At: Subject: Re: [Lsr] Prefix Unreachable Announcement Use Cases X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 17 Nov 2020 19:09:48 -0000 --000000000000cac45905b4523ce4 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Agreed. Robert Can you explain the BGP scenario you had in mind that you have mentioned a number of times that you think this PUA feature would pertain? I will respond to your other email separately. I was trying to guess as to the BGP next hop use case you were referring to but apparently was way off. Thank you Gyan On Tue, Nov 17, 2020 at 9:43 AM Acee Lindem (acee) wrote: > Speaking as WG member: > > > > I think it would be good to hone in on the BGP PE failure convergence use > case as suggested by Robert. It seems there is some interest here althoug= h > I=E2=80=99m not convinced the IGP is the right place to solve this proble= m. > > > > Thanks, > > Acee > > > > *From: *Lsr on behalf of Gyan Mishra < > hayabusagsm@gmail.com> > *Date: *Tuesday, November 17, 2020 at 4:02 AM > *To: *Robert Raszuk > *Cc: *lsr , Jeff Tantsura , Aijun > Wang , "Acee Lindem (acee)" 40cisco.com@dmarc.ietf.org> > *Subject: *Re: [Lsr] Prefix Unreachable Announcement Use Cases > > > > > > > > On Tue, Nov 17, 2020 at 3:36 AM Robert Raszuk wrote: > > > > > > Robert, I believe the original intention was related to having the dat= a > plane converge quickly when summarization is used and flip so traffic > converges from the Active ABR to the Backup ABR. > > > > I do not buy this use case. Flooding within the area is fast such that > both ABRs will get the same info. As mentioned before there is no practic= al > use of PUA for making any routing or fwd decision on which ABR to use. If > your ABRs are not connected with min redundancy this draft is a worst pat= ch > ever to work around such a design. > > > > Gyan> Agreed. The point of PUA in ABR use case is the ability to trac= k > the component prefixes and in case where component is down and traffic is > still forwarded to the ABR and dropped. The other more important use cas= e > is when links are down within the area and the area is partitioned and so > one ABR has all component prefixes however other ABR is missing half the > component prefixes. So since the ABR will by default advertise the summa= ry > as long as their is one component UP the summary is still advertised. So > this use case is severely impacting as now you have an ECMP path to the > other area for the summary via the two ABRs and you drop half your > traffic. So now with PUA the problem is fixed and the PUA is sent and no= w > traffic is only sent to the ABR that has the component prefixes. > > > > Please present us a picture indicating before and after ABRs behaviour. > > > > Gyan> will do > > > > However PUA can be used in the absence of area segmentation within a > single area when a link or node fails to converge the data plane quickly = by > sending PUA for the backup path so the active path. > > > > If there is no area segmentation then there is no summaries. So what are > we missing in the first place ? > > > > Gyan> Sorry I am stating that PUA feature can also be used intra area > where if a link or node goes down to improve data plane convergence. > > > > > > With the IGP tuned with BFD fast detection on ISIS or OSPF links and LFA = & > RLFA for MPLS or TI-LFA for SR local protection - with those tweaks the > convergence is well into sub second. So for Intra area convergence with > all the optimizations mentioned I am not sure how much faster the data > plane will converge with PUA. > > > > Even without any of the above listed chain of acronymous things will > generally work well intra-area without PUAs. > > > > Gyan> Agreed which is why I mentioned the BGP next hop self use case > if I could figure out how PUA could help there that would be a major > benefit of PUA. > > > > Thx, > R. > > > > > > -- > > [image: Image removed by sender.] > > > > *Gyan Mishra* > > *Network Solutions Architect * > > > > *M 301 502-1347 13101 Columbia Pike > > *Silver Spring, MD > > > > --=20 *Gyan Mishra* *Network Solutions A**rchitect * *M 301 502-134713101 Columbia Pike *Silver Spring, MD --000000000000cac45905b4523ce4 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Agreed.

Robert=C2=A0

Can you e= xplain the BGP scenario you had in mind that you have mentioned a number of= times that you think this PUA feature would pertain?

I will respond to your other email separately= .=C2=A0 I was trying to guess =C2=A0as to the BGP next hop use case you wer= e referring to but apparently was way off.

Thank you=C2=A0

Gyan

Speaking as WG member:

=C2=A0

I think it would be good to hone in on the BGP PE fa= ilure convergence use case as suggested by Robert. It seems there is some i= nterest here although I=E2=80=99m not convinced the IGP is the right place = to solve this problem.

=C2=A0

Thanks,

Acee

=C2=A0

From: Lsr <lsr-bounces@ietf.org>= on behalf of Gyan Mishra <hayabusagsm@gmail.com>
Date: Tuesday, November 17, 2020 at 4:02 AM
To: Robert Raszuk <robert@raszuk.net>
Cc: lsr <lsr@ie= tf.org>, Jeff Tantsura <jefftant.ietf@gmail.com>, Aijun Wang <wangaijun@tsinghua.= org.cn>, "Acee Lindem (acee)" <acee=3D40cisco.com@dmarc.ietf.org>
Subject: Re: [Lsr] Prefix Unreachable Announcement Use Cases<= u>

=C2=A0

=C2=A0

=C2=A0

=C2=A0

=C2=A0

=C2=A0 =C2=A0Robert, I be= lieve the original intention was related to having the data plane converge = quickly when summarization is used and flip so traffic converges from the A= ctive ABR to the Backup ABR.=C2=A0

=C2=A0

I do not buy this use cas= e. Flooding within the area is fast such that both ABRs will get the same i= nfo. As mentioned before there is no practical use of PUA for making any ro= uting or fwd decision on which ABR to use. If your ABRs are not connected with min redundancy this draft is a wo= rst patch ever to work around such a design.=C2=A0

=C2=A0

=C2=A0 =C2=A0Gyan> Agr= eed.=C2=A0 The point of PUA in ABR use case is the ability to track the com= ponent prefixes and in case where component is down and traffic is still fo= rwarded to the ABR and dropped.=C2=A0 The other more important use case is when links are down within the area and the area is partitione= d and so one ABR has all component prefixes however other ABR is missing ha= lf the component prefixes.=C2=A0 So since the ABR will by default advertise= the summary as long as their is one component UP the summary is still advertised.=C2=A0 So this use case is se= verely impacting as now you have an ECMP path to the other area for the sum= mary via the two ABRs and you drop half your traffic.=C2=A0 So now with PUA= the problem is fixed and the PUA is sent and now traffic is only sent to the ABR that has the component prefixes.

=C2=A0

Please present us a pictu= re indicating before and after ABRs behaviour.=C2=A0

=C2=A0

=C2=A0 =C2=A0 =C2=A0Gyan&= gt; will do=C2=A0

=C2=A0

=C2=A0 =C2=A0However PUA = can be used in the absence of area segmentation within a single area when a= link or node fails to converge the data plane quickly by sending PUA for t= he backup path so the active path.=C2=A0

=C2=A0

If there is no area segme= ntation then there is no summaries. So what are we missing in the first pla= ce ?=C2=A0

=C2=A0

=C2=A0 =C2=A0 Gyan> So= rry I am stating that PUA feature can also be used intra area where if a li= nk or node goes down to improve data plane convergence.

=C2=A0

=C2=A0

With the IGP tuned with B= FD fast detection on ISIS or OSPF links and LFA & RLFA for MPLS or TI-L= FA for SR local protection - with those tweaks the convergence is well into= sub second.=C2=A0 So for Intra area convergence with all the optimizations mentioned I am not sure how much faster the dat= a plane will converge with PUA.

=C2=A0

Even without any of the a= bove listed chain of acronymous things will generally work well intra-area = without PUAs.=C2=A0

=C2=A0

=C2=A0 =C2=A0 Gyan> Ag= reed which is why I mentioned the BGP next hop self use case if I could fig= ure out how PUA could help there that would be a major benefit of PUA.

=C2=A0

Thx,
R.

=C2=A0

=C2=A0

--

3D"Image

=
=

Gya= n Mishra

Networ= k Solutions Architect=C2=A0=

M 301 = 502-1347
13101 Columbia Pike=C2=A0=
Silver Spring, MD

=C2=A0

--
--000000000000cac45905b4523ce4-- From nobody Tue Nov 17 12:31:48 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 7B25C3A084D for ; Tue, 17 Nov 2020 12:31:46 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.087 X-Spam-Level: X-Spam-Status: No, score=-2.087 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_REMOTE_IMAGE=0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id L24kaSleSe1b for ; Tue, 17 Nov 2020 12:31:44 -0800 (PST) Received: from mail-pl1-x635.google.com (mail-pl1-x635.google.com [IPv6:2607:f8b0:4864:20::635]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id D3D113A0846 for ; Tue, 17 Nov 2020 12:31:44 -0800 (PST) Received: by mail-pl1-x635.google.com with SMTP id 35so6734749ple.12 for ; Tue, 17 Nov 2020 12:31:44 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=e+nziKsKm8h1Atsh68VQTv0FFMOmk9zYt5Lkj6rMJJM=; b=rYLvjcyV3SryH1mx+IIKlMcpTtYD28qa85/P9muydVjRyRvdK8HQtLh5MKsAzG0YQ1 9weJF3T9eYS1QKfTF4vm3gXLD4AkNIKMDVb8HOhguSb6lI/wm4IxpEK75shk/Wi+ibfy HlEcfrA3hXSedbEqqBjZwEdYpSATxK1/gqeiwUIML4IzOKCNzLnOAixh/oyoNh2hPK+X Lf73DpjVkWbH7nq0GrYRFCE5p1wFsoyCYo51zmwNiikUDqd046JYNToU+FPYp968K1+v aXm4yX26IxMooJnVwIL/Dng9dEGnZwd2ouHz1uq0ojl2EAOh4jehHJmQPeb65jZL+8pd awbw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=e+nziKsKm8h1Atsh68VQTv0FFMOmk9zYt5Lkj6rMJJM=; b=AiwkNLvgOLSPIohltFtmLg3WE7QcyRue37R0vakCxVKd6sY7reWVeA69PAKevS0ILF e9VMPDdvk4bKo39Xu7r07NUuabO1YU5L414KgMWr2bt9PhZ0znHSvCq790MqyNuI5Gd/ 1oxAjFfQ5vQh75CeIaDPAx0G0462qhKhxG3x4bY0cnHchrgSM4iA8KVUXpMf4Q8MOaWE EdsbHlRP6O/PgQeOo1EW/PE/mabm+oPZ+MTage+dS0F9wXNG+RKhm34h124/tSynysYa Jq904371oFExDrBVJ5dKcnfvVMn8ZSJwGuAWFNpM+ml9XnFZ/gNMBN9Y+yq9FaQOFkg7 CsYg== X-Gm-Message-State: AOAM531CqP1MuIBoL3Z9BjLKwrHy+xpc826FzkgN2PZ2aDmzNldfLv4u CkhHE8YdkGspuK0mRFy5ry51HgYczTI5ILvIrvw= X-Google-Smtp-Source: ABdhPJzrW2wz4TdpDxAdV8RT+p9348EXXk+gGUg2XnEIS4ElSoTDuVlkihHSvRpVUBtgAIVnkMsiAn/3Yy9y7zqm2nc= X-Received: by 2002:a17:90a:178b:: with SMTP id q11mr761222pja.132.1605645104227; Tue, 17 Nov 2020 12:31:44 -0800 (PST) MIME-Version: 1.0 References: <016b01d6bca9$cf908c20$6eb1a460$@tsinghua.org.cn> In-Reply-To: From: Gyan Mishra Date: Tue, 17 Nov 2020 15:31:33 -0500 Message-ID: To: Robert Raszuk Cc: "Acee Lindem (acee)" , Aijun Wang , Jeff Tantsura , lsr Content-Type: multipart/alternative; boundary="00000000000012ac4705b4536245" Archived-At: Subject: Re: [Lsr] Prefix Unreachable Announcement Use Cases X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 17 Nov 2020 20:31:47 -0000 --00000000000012ac4705b4536245 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, Nov 17, 2020 at 9:43 AM Robert Raszuk wrote: > Hi Gyan, > > Gyan>. We could use Aijun=E2=80=99s passive interface new top level= TLV to >> link the next hop rewrite loopback to the PE-CE links all being set to >> passive. So if any PE-CE link goes down a PUA is sent and the next hop >> converges PIC core PE-CE link which is now associated with the Loopback. >> This would be a major benefit of PUA for PIC core convergence when >> next-hop-self is used which applies to MPLS and SR and IP based core. >> > > I have read the above three sentences five times and came with two basic > observations: > > * You are mixing PIC Core with PIC Edge - Please do not. Those are > completely separate features and it is a feature not a bug to keep them > that way. > Gyan> Sorry for the confusion. I agree we are not taking BGP PIC core which is H-FIB core feature for core failures resulting in IGP next hop update. Also we are not talking about BGP PIC edge pre programmed backup paths. What I was trying to address is use of PUA to resolve a issue with BGP convergence related to using BCP use of next hop self rewrite so PE-CE link next hops do not have to be flooded into the IGP. Down side of next-hop-self is for convergence in the core from edge failure, the edge failure is not detected and you have to wait for route to be withdrawn. So I was thinking maybe PUA data plane convergence mechanism would be a way to help with convergence. Not sure how or if possible but was thinking that as a possible use case for PUA. > > * You are mixing external PE-CE interfaces with IGP passive interfaces - > Please do not. There should be no IGP flooding of any sort associated wit= h > state of PE-CE interface. No need. > Understood. Bad idea. > > Thx a lot, > R. > > -- *Gyan Mishra* *Network Solutions A**rchitect * *M 301 502-134713101 Columbia Pike *Silver Spring, MD --00000000000012ac4705b4536245 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable


<= div>
Hi Gyan,

=C2=A0 =C2=A0 =C2=A0 Gya= n>. We could use Aijun=E2=80=99s passive interface new top level TLV to = link the next hop rewrite loopback to the PE-CE links all being set to pass= ive. So if any PE-CE link goes down a PUA is sent and the next hop converge= s PIC core PE-CE link which is now associated with the Loopback.=C2=A0 This= would be a major benefit of PUA for PIC core convergence when next-hop-sel= f is used which applies to MPLS and SR and IP based core.
=

I have read the above three sentences five= times and came with two basic observations:=C2=A0

* You are mixing PIC Core with PIC Edge - Please=C2=A0do not. Those are co= mpletely separate features and it is a feature not a bug to keep them that = way.=C2=A0
On Tue, Nov 17, 2020 at 9:43 AM R= obert Raszuk <rob= ert@raszuk.net> wrote:

=
=C2=A0 =C2=A0Gyan> Sorry for the confusion. I agr= ee we are not taking BGP PIC core which is H-FIB core feature for core fail= ures resulting in IGP next hop update.=C2=A0 Also we are not talking about = BGP PIC edge pre programmed backup paths.=C2=A0 What I was trying to addres= s is use of PUA to resolve a issue with BGP convergence related to using BC= P use of next hop self rewrite so PE-CE link next hops do not have to be fl= ooded into the IGP.=C2=A0 Down side of next-hop-self is for convergence in = the core from edge failure, the edge failure is not detected and you have t= o wait for route to be withdrawn. So I was thinking maybe PUA data plane co= nvergence mechanism would be a way to help with convergence.=C2=A0 Not sure= how or if possible but was thinking that as a possible use case for PUA.

* You are mixing external PE-CE interfaces with IGP passive interfaces - = Please do not. There should be no IGP flooding of any sort associated=C2=A0= with state of PE-CE interface. No need.=C2=A0

=C2=A0 =C2=A0 Understood.=C2= =A0 Bad idea.

Thx a lot,
R.

=

Gyan Mishra

Network Solutions Architect=C2=A0<= /p>

M 301 502-1347
13101 Columbia Pike=C2=A0
= Silver Spring, MD


--00000000000012ac4705b4536245-- From nobody Tue Nov 17 12:40:35 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 8ADAA3A097A for ; Tue, 17 Nov 2020 12:40:33 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.086 X-Spam-Level: X-Spam-Status: No, score=-2.086 tagged_above=-999 required=5 tests=[AC_DIV_BONANZA=0.001, BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_REMOTE_IMAGE=0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 3IZSZLSzjGz8 for ; Tue, 17 Nov 2020 12:40:31 -0800 (PST) Received: from mail-pj1-x1033.google.com (mail-pj1-x1033.google.com [IPv6:2607:f8b0:4864:20::1033]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 5B0B73A091C for ; Tue, 17 Nov 2020 12:40:31 -0800 (PST) Received: by mail-pj1-x1033.google.com with SMTP id gi3so1197879pjb.3 for ; Tue, 17 Nov 2020 12:40:31 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=ozTAbr0Thb59W3Bx/WLvl87yHD55gDCT7XjRL4sTPQY=; b=iKurmNcv6jPrNEuXnsTlLFW7yRsDoyJvKPX8yYHVBiOV37zgh5S2AVdBC2Fo8/u7sX wLeYzkOsHAbHsFn4R8HiaA/Z3fHK0EEfdegMbetWgYYQjmlqSi4Rr122pijCpK1Z7uFU 9TAjw+6M6say8UGP36+rgI+oRAfAJpA3wyFbU89ioLCV29Kc5QN9tgntzlDT6Acrb7yu i7D/fti+Gz3WXksUUGo9cN4c+c/d/Rln0WiNeNKCmP5DbakYy3eYyUKjQfcQytViNqje l5aHAzQuXlVQWYZQIRGNzEJNX/1rsaBp95A97UJrIjyJTfOelCQ7diwa24AkfpJvzrx0 Tk0g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=ozTAbr0Thb59W3Bx/WLvl87yHD55gDCT7XjRL4sTPQY=; b=mvXlz6Aa9F8FNNyh45FHV3TCrp7TwmHT7C5vO5g6SriJDgf+YuZnTUatCSIIid9lHE ZUtrcm9d4jA/kl9FFEnvgEgHX66KLvMhDGzTzzj4m/Yd0SHP6Sg5N+PKD6i0E0P+oy+i QxKUl78PfcCi+jbNvASi0WarAZ+zHsiJ6hcQh4WxN7o9w7jBDNaBsU/j13GtlTM/KmBd VsS/BZNtBQipC1k3xmwAMI/sUJJZ2I+pHyF4HaYBTBK+MpJVpqzdGQ4PhGdKg7JT6xQu RJP5DtkZb0VnQbK1h9m6qlL3Z7yRd4TQlaVNlZ04NlH9PqU+5kYO/2pnR1icIJjcCzYo Jblw== X-Gm-Message-State: AOAM533ubrfAIowakmdVG+3o26dyyFn7uu+yH30xB8u2xU8R/2C7L2C/ T9Sw00MH9KGU0jemD/9bWRLHrcfHNGY4enuKosk= X-Google-Smtp-Source: ABdhPJyEbMWPmoIzp8dSYLfxakuCu1oiPDL4FrVcdCKQGYCGueayAGjhj4asmsIxd6irTTnW6d+axvWOJse7B+uwj0k= X-Received: by 2002:a17:90a:c254:: with SMTP id d20mr830289pjx.112.1605645630789; Tue, 17 Nov 2020 12:40:30 -0800 (PST) MIME-Version: 1.0 References: <016b01d6bca9$cf908c20$6eb1a460$@tsinghua.org.cn> <32DFCE3A-D41C-48CA-928A-37011D158AEF@cisco.com> In-Reply-To: From: Gyan Mishra Date: Tue, 17 Nov 2020 15:40:19 -0500 Message-ID: To: "Acee Lindem (acee)" Cc: "Acee Lindem (acee)" , Aijun Wang , Jeff Tantsura , Robert Raszuk , lsr Content-Type: multipart/alternative; boundary="000000000000755c1705b4538185" Archived-At: Subject: Re: [Lsr] Prefix Unreachable Announcement Use Cases X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 17 Nov 2020 20:40:34 -0000 --000000000000755c1705b4538185 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Robert I am recalling now the BGP use case you mentioned. If the next hop is being summarized between areas which it would be, the next hop failure component prefix is now hidden in the summary and now you have to wait for BGP timer to pop and route withdrawal. So for this failure scenario one option is multihop BFD but that does get way complicated. So here the obvious and best use case for PUA would be for the data plane detection of the next hop component down at which time PUA is sent flooded and the routers in the other area now set next hop to null for that next hop and are forced to converge on alternate next hop. Let me update the presentation to add this use case. Thanks Gyan On Tue, Nov 17, 2020 at 2:09 PM Gyan Mishra wrote: > Agreed. > > Robert > > Can you explain the BGP scenario you had in mind that you have mentioned = a > number of times that you think this PUA feature would pertain? > > I will respond to your other email separately. I was trying to guess as > to the BGP next hop use case you were referring to but apparently was way > off. > > Thank you > > Gyan > > On Tue, Nov 17, 2020 at 9:43 AM Acee Lindem (acee) wrote= : > >> Speaking as WG member: >> >> >> >> I think it would be good to hone in on the BGP PE failure convergence us= e >> case as suggested by Robert. It seems there is some interest here althou= gh >> I=E2=80=99m not convinced the IGP is the right place to solve this probl= em. >> >> >> >> Thanks, >> >> Acee >> >> >> >> *From: *Lsr on behalf of Gyan Mishra < >> hayabusagsm@gmail.com> >> *Date: *Tuesday, November 17, 2020 at 4:02 AM >> *To: *Robert Raszuk >> *Cc: *lsr , Jeff Tantsura , Aijun >> Wang , "Acee Lindem (acee)" > 40cisco.com@dmarc.ietf.org> >> *Subject: *Re: [Lsr] Prefix Unreachable Announcement Use Cases >> >> >> >> >> >> >> >> On Tue, Nov 17, 2020 at 3:36 AM Robert Raszuk wrote: >> >> >> >> >> >> Robert, I believe the original intention was related to having the >> data plane converge quickly when summarization is used and flip so traff= ic >> converges from the Active ABR to the Backup ABR. >> >> >> >> I do not buy this use case. Flooding within the area is fast such that >> both ABRs will get the same info. As mentioned before there is no practi= cal >> use of PUA for making any routing or fwd decision on which ABR to use. I= f >> your ABRs are not connected with min redundancy this draft is a worst pa= tch >> ever to work around such a design. >> >> >> >> Gyan> Agreed. The point of PUA in ABR use case is the ability to >> track the component prefixes and in case where component is down and >> traffic is still forwarded to the ABR and dropped. The other more >> important use case is when links are down within the area and the area i= s >> partitioned and so one ABR has all component prefixes however other ABR = is >> missing half the component prefixes. So since the ABR will by default >> advertise the summary as long as their is one component UP the summary i= s >> still advertised. So this use case is severely impacting as now you hav= e >> an ECMP path to the other area for the summary via the two ABRs and you >> drop half your traffic. So now with PUA the problem is fixed and the PU= A >> is sent and now traffic is only sent to the ABR that has the component >> prefixes. >> >> >> >> Please present us a picture indicating before and after ABRs behaviour. >> >> >> >> Gyan> will do >> >> >> >> However PUA can be used in the absence of area segmentation within a >> single area when a link or node fails to converge the data plane quickly= by >> sending PUA for the backup path so the active path. >> >> >> >> If there is no area segmentation then there is no summaries. So what are >> we missing in the first place ? >> >> >> >> Gyan> Sorry I am stating that PUA feature can also be used intra are= a >> where if a link or node goes down to improve data plane convergence. >> >> >> >> >> >> With the IGP tuned with BFD fast detection on ISIS or OSPF links and LFA >> & RLFA for MPLS or TI-LFA for SR local protection - with those tweaks th= e >> convergence is well into sub second. So for Intra area convergence with >> all the optimizations mentioned I am not sure how much faster the data >> plane will converge with PUA. >> >> >> >> Even without any of the above listed chain of acronymous things will >> generally work well intra-area without PUAs. >> >> >> >> Gyan> Agreed which is why I mentioned the BGP next hop self use case >> if I could figure out how PUA could help there that would be a major >> benefit of PUA. >> >> >> >> Thx, >> R. >> >> >> >> >> >> -- >> >> [image: Image removed by sender.] >> >> >> >> *Gyan Mishra* >> >> *Network Solutions Architect * >> >> >> >> *M 301 502-1347 13101 Columbia Pike >> >> *Silver Spring, MD >> >> >> >> > -- > > > > *Gyan Mishra* > > *Network Solutions A**rchitect * > > > > *M 301 502-134713101 Columbia Pike *Silver Spring, MD > > -- *Gyan Mishra* *Network Solutions A**rchitect * *M 301 502-134713101 Columbia Pike *Silver Spring, MD --000000000000755c1705b4538185 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

Robert=C2=A0

I am recalling now the BGP use case you mentioned.

If the next hop is being s= ummarized between areas which it would be, the next hop failure component p= refix is now hidden in the summary and now you have to wait for BGP timer t= o pop and route withdrawal.=C2=A0

So for this failure scenario one option is multihop BFD but that = does get way complicated.

So here the obvious and best use case for PUA would be for the data plane= detection of the next hop component down at which time PUA is sent flooded= and the routers in the other area now set next hop to null for that next h= op and are forced to converge on alternate next hop.=C2=A0

Let me update the presentation to add th= is use case.

Thanks

Gyan

On Tue, Nov 17, 202= 0 at 2:09 PM Gyan Mishra <hayab= usagsm@gmail.com> wrote:
Agreed.

R= obert=C2=A0

Can you expl= ain the BGP scenario you had in mind that you have mentioned a number of ti= mes that you think this PUA feature would pertain?
<= br>
I will respond to your other email separately.= =C2=A0 I was trying to guess =C2=A0as to the BGP next hop use case you were= referring to but apparently was way off.

=
Thank you=C2=A0

Gyan

On Tue, Nov 17, 2020 at 9:43 AM Acee Lindem (acee) <<= a href=3D"mailto:acee@cisco.com" target=3D"_blank">acee@cisco.com> w= rote:

Speaking as WG member:

=C2=A0

I think it would be good to hone in on the BGP PE fa= ilure convergence use case as suggested by Robert. It seems there is some i= nterest here although I=E2=80=99m not convinced the IGP is the right place = to solve this problem.

=C2=A0

Thanks,

Acee

=C2=A0

From: Lsr <lsr-bounces@ietf.org>= on behalf of Gyan Mishra <hayabusagsm@gmail.com>
Date: Tuesday, November 17, 2020 at 4:02 AM
To: Robert Raszuk <robert@raszuk.net>
Cc: lsr <lsr@ie= tf.org>, Jeff Tantsura <jefftant.ietf@gmail.com>, Aijun Wang <wangaijun@tsinghua.= org.cn>, "Acee Lindem (acee)" <acee=3D40cisco.com@dmarc.ietf.org>
Subject: Re: [Lsr] Prefix Unreachable Announcement Use Cases<= u>

=C2=A0

=C2=A0

=C2=A0

=C2=A0

=C2=A0

=C2=A0 =C2=A0Robert, I be= lieve the original intention was related to having the data plane converge = quickly when summarization is used and flip so traffic converges from the A= ctive ABR to the Backup ABR.=C2=A0

=C2=A0

I do not buy this use cas= e. Flooding within the area is fast such that both ABRs will get the same i= nfo. As mentioned before there is no practical use of PUA for making any ro= uting or fwd decision on which ABR to use. If your ABRs are not connected with min redundancy this draft is a wo= rst patch ever to work around such a design.=C2=A0

=C2=A0

=C2=A0 =C2=A0Gyan> Agr= eed.=C2=A0 The point of PUA in ABR use case is the ability to track the com= ponent prefixes and in case where component is down and traffic is still fo= rwarded to the ABR and dropped.=C2=A0 The other more important use case is when links are down within the area and the area is partitione= d and so one ABR has all component prefixes however other ABR is missing ha= lf the component prefixes.=C2=A0 So since the ABR will by default advertise= the summary as long as their is one component UP the summary is still advertised.=C2=A0 So this use case is se= verely impacting as now you have an ECMP path to the other area for the sum= mary via the two ABRs and you drop half your traffic.=C2=A0 So now with PUA= the problem is fixed and the PUA is sent and now traffic is only sent to the ABR that has the component prefixes.

=C2=A0

Please present us a pictu= re indicating before and after ABRs behaviour.=C2=A0

=C2=A0

=C2=A0 =C2=A0 =C2=A0Gyan&= gt; will do=C2=A0

=C2=A0

=C2=A0 =C2=A0However PUA = can be used in the absence of area segmentation within a single area when a= link or node fails to converge the data plane quickly by sending PUA for t= he backup path so the active path.=C2=A0

=C2=A0

If there is no area segme= ntation then there is no summaries. So what are we missing in the first pla= ce ?=C2=A0

=C2=A0

=C2=A0 =C2=A0 Gyan> So= rry I am stating that PUA feature can also be used intra area where if a li= nk or node goes down to improve data plane convergence.

=C2=A0

=C2=A0

With the IGP tuned with B= FD fast detection on ISIS or OSPF links and LFA & RLFA for MPLS or TI-L= FA for SR local protection - with those tweaks the convergence is well into= sub second.=C2=A0 So for Intra area convergence with all the optimizations mentioned I am not sure how much faster the dat= a plane will converge with PUA.

=C2=A0

Even without any of the a= bove listed chain of acronymous things will generally work well intra-area = without PUAs.=C2=A0

=C2=A0

=C2=A0 =C2=A0 Gyan> Ag= reed which is why I mentioned the BGP next hop self use case if I could fig= ure out how PUA could help there that would be a major benefit of PUA.

=C2=A0

Thx,
R.

=C2=A0

=C2=A0

--

3D"Image

=

Gya= n Mishra

Networ= k Solutions Architect=C2=A0=

M 301 = 502-1347
13101 Colum= bia Pike=C2=A0
Silver Spring, MD

=C2=A0

--


Gyan Mishra

Network Solutions Architect=C2=A0

M 301 502-1347
13101 Columbia Pike=C2=A0
<= /i>Silver Spring, MD


=
--
--000000000000755c1705b4538185-- From nobody Tue Nov 17 14:32:04 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0EBAF3A0FD5 for ; Tue, 17 Nov 2020 14:31:57 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.087 X-Spam-Level: X-Spam-Status: No, score=-2.087 tagged_above=-999 required=5 tests=[AC_DIV_BONANZA=0.001, BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_REMOTE_IMAGE=0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=raszuk.net Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Gtgn4ekZZulD for ; Tue, 17 Nov 2020 14:31:53 -0800 (PST) Received: from mail-lj1-x22e.google.com (mail-lj1-x22e.google.com [IPv6:2a00:1450:4864:20::22e]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id BE3E73A0E17 for ; Tue, 17 Nov 2020 14:31:47 -0800 (PST) Received: by mail-lj1-x22e.google.com with SMTP id p12so108010ljc.9 for ; Tue, 17 Nov 2020 14:31:47 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=raszuk.net; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=+Vh0Z7Ka2jEmpKrnb0KyVHkZxq5JPFg6s6RbFCNqK0I=; b=ILkncGrbnYE3CuR8DV0if/g0MCpp/DDIT5k4Aa6tUzPgacYM3hQdEwGtZDjffZApXC 0BF34B1dzbeVUETOrcz2tVxtXVzZ7ibX+XmLiCFiVQi75G82k3xvkIrbjTKqHqSNKPAA axYGT1/F610t8vZG1KIGy6cvdLn5S32U9x2v7sUvQTbj3BUSHPfJMa7xyCLDIE9DlMQ0 KoGocPO0JBDzVURykmP3xStMp7b8jBDWZuKOLAXoGKOEjVp12K1nkPPDRGCQaNXE0jPJ USAuzy6G6l1h7nGmFAUxpjufWRz+z+vQmojSHXPoO2rMfwP3flkuXWTxThnthXSAw0ta laMg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=+Vh0Z7Ka2jEmpKrnb0KyVHkZxq5JPFg6s6RbFCNqK0I=; b=Yh3Bwdubwgj/aZ8ggphq/QnivB5sIv5Ve9SsMkvSj5ZJYMq3Z19C2kempdRNC7syA3 l6NWWzwYGcVk1c/TehxFF5MwfrTP5uDouklO3cxi9EVVMR20MM2EbsVb4gZ5t4sZBn5s fS2H9LNolZKEm8th+NLvw48mvrGyNHwDzvjaPaeun4Ia3mlt2hdHXBTGdkdsBwF01MGF sxjVQTTz0sbUQV5O+L7Ek/1chyPSCO+LQuipkwu2VjKA1e3vaZHjcnu+vIjP/Spd0lTl xONkoCSEMp18bYrCX6FRnAhIDYUA8zbL5DI0PvmdLt0qbAFlC9SgrvnnDOMvaqJFnDhD B2lA== X-Gm-Message-State: AOAM531JjXvqraWAFtJBHX/8lSnNuxHtfwnGJIKIx0xDe9AnD8vWyVdu L+ixy9IUMF5veckJMhTWzGn6d64204X37UwBdAwpTA== X-Google-Smtp-Source: ABdhPJyn4qlklzc3eUlPxDNa/hrPbEwsHEXV7QIRzh2enfnzfcx8MpEkE2QvPIoViKw7ELmYdYMxYRfrJ0ZruRsMp7U= X-Received: by 2002:a2e:8792:: with SMTP id n18mr2866684lji.57.1605652305887; Tue, 17 Nov 2020 14:31:45 -0800 (PST) MIME-Version: 1.0 References: <016b01d6bca9$cf908c20$6eb1a460$@tsinghua.org.cn> <32DFCE3A-D41C-48CA-928A-37011D158AEF@cisco.com> In-Reply-To: From: Robert Raszuk Date: Tue, 17 Nov 2020 23:31:35 +0100 Message-ID: To: Gyan Mishra Cc: "Acee Lindem (acee)" , "Acee Lindem (acee)" , Aijun Wang , Jeff Tantsura , lsr Content-Type: multipart/alternative; boundary="00000000000053694005b4550fd7" Archived-At: Subject: Re: [Lsr] Prefix Unreachable Announcement Use Cases X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 17 Nov 2020 22:32:03 -0000 --00000000000053694005b4550fd7 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Yes that is the case where I see some potential use case. Especially considering also https://tools.ietf.org/html/rfc5283 - which by many network operators is very desired, but not configured due to "slow BGP convergence" - pls let's not go there :) But again if someone knows how to configure BGP properly I think IGP speedup would be marginal or even null hence a grain of hesitation if we should use IGP flooding for it. Maybe in some scenarios ... which PUA authors need to spell out to move fwd I suppose. Cheers, R. On Tue, Nov 17, 2020 at 9:40 PM Gyan Mishra wrote: > > Robert > > I am recalling now the BGP use case you mentioned. > > If the next hop is being summarized between areas which it would be, the > next hop failure component prefix is now hidden in the summary and now yo= u > have to wait for BGP timer to pop and route withdrawal. > > So for this failure scenario one option is multihop BFD but that does get > way complicated. > > So here the obvious and best use case for PUA would be for the data plane > detection of the next hop component down at which time PUA is sent floode= d > and the routers in the other area now set next hop to null for that next > hop and are forced to converge on alternate next hop. > > Let me update the presentation to add this use case. > > Thanks > > Gyan > > On Tue, Nov 17, 2020 at 2:09 PM Gyan Mishra wrote= : > >> Agreed. >> >> Robert >> >> Can you explain the BGP scenario you had in mind that you have mentioned >> a number of times that you think this PUA feature would pertain? >> >> I will respond to your other email separately. I was trying to guess a= s >> to the BGP next hop use case you were referring to but apparently was wa= y >> off. >> >> Thank you >> >> Gyan >> >> On Tue, Nov 17, 2020 at 9:43 AM Acee Lindem (acee) >> wrote: >> >>> Speaking as WG member: >>> >>> >>> >>> I think it would be good to hone in on the BGP PE failure convergence >>> use case as suggested by Robert. It seems there is some interest here >>> although I=E2=80=99m not convinced the IGP is the right place to solve = this problem. >>> >>> >>> >>> Thanks, >>> >>> Acee >>> >>> >>> >>> *From: *Lsr on behalf of Gyan Mishra < >>> hayabusagsm@gmail.com> >>> *Date: *Tuesday, November 17, 2020 at 4:02 AM >>> *To: *Robert Raszuk >>> *Cc: *lsr , Jeff Tantsura , >>> Aijun Wang , "Acee Lindem (acee)" >> 40cisco.com@dmarc.ietf.org> >>> *Subject: *Re: [Lsr] Prefix Unreachable Announcement Use Cases >>> >>> >>> >>> >>> >>> >>> >>> On Tue, Nov 17, 2020 at 3:36 AM Robert Raszuk wrote= : >>> >>> >>> >>> >>> >>> Robert, I believe the original intention was related to having the >>> data plane converge quickly when summarization is used and flip so traf= fic >>> converges from the Active ABR to the Backup ABR. >>> >>> >>> >>> I do not buy this use case. Flooding within the area is fast such that >>> both ABRs will get the same info. As mentioned before there is no pract= ical >>> use of PUA for making any routing or fwd decision on which ABR to use. = If >>> your ABRs are not connected with min redundancy this draft is a worst p= atch >>> ever to work around such a design. >>> >>> >>> >>> Gyan> Agreed. The point of PUA in ABR use case is the ability to >>> track the component prefixes and in case where component is down and >>> traffic is still forwarded to the ABR and dropped. The other more >>> important use case is when links are down within the area and the area = is >>> partitioned and so one ABR has all component prefixes however other ABR= is >>> missing half the component prefixes. So since the ABR will by default >>> advertise the summary as long as their is one component UP the summary = is >>> still advertised. So this use case is severely impacting as now you ha= ve >>> an ECMP path to the other area for the summary via the two ABRs and you >>> drop half your traffic. So now with PUA the problem is fixed and the P= UA >>> is sent and now traffic is only sent to the ABR that has the component >>> prefixes. >>> >>> >>> >>> Please present us a picture indicating before and after ABRs behaviour. >>> >>> >>> >>> Gyan> will do >>> >>> >>> >>> However PUA can be used in the absence of area segmentation within a >>> single area when a link or node fails to converge the data plane quickl= y by >>> sending PUA for the backup path so the active path. >>> >>> >>> >>> If there is no area segmentation then there is no summaries. So what ar= e >>> we missing in the first place ? >>> >>> >>> >>> Gyan> Sorry I am stating that PUA feature can also be used intra >>> area where if a link or node goes down to improve data plane convergenc= e. >>> >>> >>> >>> >>> >>> With the IGP tuned with BFD fast detection on ISIS or OSPF links and LF= A >>> & RLFA for MPLS or TI-LFA for SR local protection - with those tweaks t= he >>> convergence is well into sub second. So for Intra area convergence wit= h >>> all the optimizations mentioned I am not sure how much faster the data >>> plane will converge with PUA. >>> >>> >>> >>> Even without any of the above listed chain of acronymous things will >>> generally work well intra-area without PUAs. >>> >>> >>> >>> Gyan> Agreed which is why I mentioned the BGP next hop self use cas= e >>> if I could figure out how PUA could help there that would be a major >>> benefit of PUA. >>> >>> >>> >>> Thx, >>> R. >>> >>> >>> >>> >>> >>> -- >>> >>> [image: Image removed by sender.] >>> >>> >>> >>> *Gyan Mishra* >>> >>> *Network Solutions Architect * >>> >>> >>> >>> *M 301 502-1347 13101 Columbia Pike >>> >>> *Silver Spring, MD >>> >>> >>> >>> >> -- >> >> >> >> *Gyan Mishra* >> >> *Network Solutions A**rchitect * >> >> >> >> *M 301 502-134713101 Columbia Pike *Silver Spring, MD >> >> -- > > > > *Gyan Mishra* > > *Network Solutions A**rchitect * > > > > *M 301 502-134713101 Columbia Pike *Silver Spring, MD > > --00000000000053694005b4550fd7 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

Yes that is the case where I see some poten= tial use case.=C2=A0

Especially considering also=C2=A0https://tools.ietf.org/html/r= fc5283 - which by many network operators is very desired, but not confi= gured due to "slow BGP convergence" - pls let's not go there = :)=C2=A0

But again=C2=A0if someone knows how to co= nfigure=C2=A0BGP properly I think IGP speedup would be marginal or even nul= l hence a grain of hesitation if we should use IGP flooding for it. Maybe i= n some scenarios ... which PUA authors need to spell out to move fwd I supp= ose.=C2=A0

Cheers,
R.








On Tue, Nov 17, 2020 at 9:40 PM Gyan Mishra <hayabusagsm@gmail.com> wrote:

Robert=C2=A0

I= am recalling now the BGP use case you mentioned.
If the next hop is being summarized between areas= which it would be, the next hop failure component prefix is now hidden in = the summary and now you have to wait for BGP timer to pop and route withdra= wal.=C2=A0

So for this f= ailure scenario one option is multihop BFD but that does get way complicate= d.

So here the obvious a= nd best use case for PUA would be for the data plane detection of the next = hop component down at which time PUA is sent flooded and the routers in the= other area now set next hop to null for that next hop and are forced to co= nverge on alternate next hop.=C2=A0

Let me update the presentation to add this use case.

Thanks

=
Gyan

On Tue, Nov 17, 2020 at 2:09 PM Gyan Mishr= a <hayabusags= m@gmail.com> wrote:
Agreed.

Robert=C2=A0

Can you explain the BGP scenario you had in mind that you have mentioned = a number of times that you think this PUA feature would pertain?

I will respond to your other email= separately.=C2=A0 I was trying to guess =C2=A0as to the BGP next hop use c= ase you were referring to but apparently was way off.

Thank you=C2=A0

Gyan

On Tue, Nov 17, 2020 at 9:43 AM Acee Lindem = (acee) <acee@cisco.c= om> wrote:

Speaking as WG member:

=C2=A0

I think it would be good to hone in on the BGP PE fa= ilure convergence use case as suggested by Robert. It seems there is some i= nterest here although I=E2=80=99m not convinced the IGP is the right place = to solve this problem.

=C2=A0

Thanks,

Acee

=C2=A0

From: Lsr <lsr-bounces@ietf.org> o= n behalf of Gyan Mishra <hayabusagsm@gmail.com>
Date: Tuesday, November 17, 2020 at 4:02 AM
To: Robert Raszuk <robert@raszuk.net>
Cc: lsr <lsr@ie= tf.org>, Jeff Tantsura <jefftant.ietf@gmail.com>, Aijun Wang <wangaijun@tsinghua.= org.cn>, "Acee Lindem (acee)" <acee=3D40cisco.com@dmarc.ietf.org>
Subject: Re: [Lsr] Prefix Unreachable Announcement Use Cases<= u>

=C2=A0

=C2=A0

=C2=A0

On Tue, Nov 17, 2020 at = 3:36 AM Robert Raszuk <robert@raszuk.net> wrote:

=C2=A0

=C2=A0

=C2=A0 =C2=A0Robert, I b= elieve the original intention was related to having the data plane converge= quickly when summarization is used and flip so traffic converges from the = Active ABR to the Backup ABR.=C2=A0

=C2=A0

I do not buy this use ca= se. Flooding within the area is fast such that both ABRs will get the same = info. As mentioned before there is no practical use of PUA for making any r= outing or fwd decision on which ABR to use. If your ABRs are not connected with min redundancy this draft is a wo= rst patch ever to work around such a design.=C2=A0

=C2=A0

=C2=A0 =C2=A0Gyan> Ag= reed.=C2=A0 The point of PUA in ABR use case is the ability to track the co= mponent prefixes and in case where component is down and traffic is still f= orwarded to the ABR and dropped.=C2=A0 The other more important use case is when links are down within the area and the area is partitione= d and so one ABR has all component prefixes however other ABR is missing ha= lf the component prefixes.=C2=A0 So since the ABR will by default advertise= the summary as long as their is one component UP the summary is still advertised.=C2=A0 So this use case is se= verely impacting as now you have an ECMP path to the other area for the sum= mary via the two ABRs and you drop half your traffic.=C2=A0 So now with PUA= the problem is fixed and the PUA is sent and now traffic is only sent to the ABR that has the component prefixes.

=C2=A0

Please present us a pict= ure indicating before and after ABRs behaviour.=C2=A0

=C2=A0

=C2=A0 =C2=A0 =C2=A0Gyan= > will do=C2=A0

=C2=A0

=C2=A0 =C2=A0However PUA= can be used in the absence of area segmentation within a single area when = a link or node fails to converge the data plane quickly by sending PUA for = the backup path so the active path.=C2=A0

=C2=A0

If there is no area segm= entation then there is no summaries. So what are we missing in the first pl= ace ?=C2=A0

=C2=A0

=C2=A0 =C2=A0 Gyan> S= orry I am stating that PUA feature can also be used intra area where if a l= ink or node goes down to improve data plane convergence.

=C2=A0

=C2=A0

With the IGP tuned with = BFD fast detection on ISIS or OSPF links and LFA & RLFA for MPLS or TI-= LFA for SR local protection - with those tweaks the convergence is well int= o sub second.=C2=A0 So for Intra area convergence with all the optimizations mentioned I am not sure how much faster the dat= a plane will converge with PUA.

=C2=A0

Even without any of the = above listed chain of acronymous things will generally work well intra-area= without PUAs.=C2=A0

=C2=A0

=C2=A0 =C2=A0 Gyan> A= greed which is why I mentioned the BGP next hop self use case if I could fi= gure out how PUA could help there that would be a major benefit of PUA.<= /u>

=C2=A0

Thx,
R.

=C2=A0

=C2=A0

--

3D"Image

<= div>

Gyan Mishra<= /u>

Network Solutions = Architect=C2=A0

M 301 502-1347
13101 Colum= bia Pike=C2=A0
Silver Spring, MD

=C2=A0

--


Network Solutions Architect=C2=A0

M 301 502-1= 347
13101 Columbia Pike=C2=A0
Silver Spring, MD

<= div>
--


Network Solutions Architect=C2=A0

M 301 502-1= 347
13101 Columbia Pike=C2=A0
Silver Spring, MD

<= div>
--00000000000053694005b4550fd7-- From nobody Tue Nov 17 14:44:59 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 47ADE3A0E37 for ; Tue, 17 Nov 2020 14:44:58 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.086 X-Spam-Level: X-Spam-Status: No, score=-2.086 tagged_above=-999 required=5 tests=[AC_DIV_BONANZA=0.001, BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_REMOTE_IMAGE=0.01, URIBL_BLOCKED=0.001] autolearn=unavailable autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 9erkwQI20rpq for ; Tue, 17 Nov 2020 14:44:56 -0800 (PST) Received: from mail-pj1-x102b.google.com (mail-pj1-x102b.google.com [IPv6:2607:f8b0:4864:20::102b]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id F1F013A0E33 for ; Tue, 17 Nov 2020 14:44:55 -0800 (PST) Received: by mail-pj1-x102b.google.com with SMTP id gv24so1285509pjb.3 for ; Tue, 17 Nov 2020 14:44:55 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=y9pmgIJZT0UCQ13cQ/lPHX/Xhk4jUFC+4Jk6VvU3MXI=; b=Ii9NHKpx49jFPqvQlfbgYwxzNM2dfPiUogz3eIpvBhUS00a745NSmXwTSKeuvW+tS4 RqHKUL18LpGL8z4Mwmjfc5LOpV2UnQA/rRL14vdggg7UH+cr1CWZFTB1+HXJZ9yH4Jpu B2Of4B5RhZFmCj+8ZfmfGYVvlf7bKXxUqhmqJaSF325TQ/MI09pblYpRq71ydedp0D4H lqRKj2TyZ50O/oz0pnnhQAAgO1Z0W5Tw10ci9Aw0YxFKV2AQaB2dJoO/vypKVjvYltU+ yk8eiU5co1OccFn2pf5YFhuUA4y+dOVbAdlGcJPb+yIF2ncgBus7hWI83t0rkiMEFHy9 VA8w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=y9pmgIJZT0UCQ13cQ/lPHX/Xhk4jUFC+4Jk6VvU3MXI=; b=dX5JTm3xN+VFtVeGvguw3BpIeVgXbi1xXCvezP17RqXOndt/ekYFDBrbf4GH+7/aHL HbMcGyX+i6lxtKuXDF5xprti+fYgL7lckeqMkCfctEq15cFOZ5QukEy7uFdNnG8A9m5I B/JPBiZd8NxVMiVgfJI3lQzbb/ju7csOI2oeOECEqLiFVafd7nIxmrs+R0pt6STOSMWJ 8XeZBxsGhM/P1MRTwxqKyCKZ7dZb8Pq/9br96a427AVZs8Jjj7YsnnhYBFb0lJIHjm/O GNo+7bQLBc6c/Hz6xeLspozRN5viL20MHTfvBW2V3D4z3oNkBHM3t0Tp9IungPrrACEV B/6w== X-Gm-Message-State: AOAM5316XbaTk9bbJkmpxigrxlDTat2XO/x6l4L1FNGkpdtG/lUsWRds XmtXCHNkTFiab5Wc4HPnlzRPoxrJNiSVpCzARh8= X-Google-Smtp-Source: ABdhPJwygt6ao38AFLszPfI/73CGxPKrYjXEOzRpUnntwVhpouD6QHg8bYwi0p5f7ETIokHR54IJoJ5ov89Z32SbtMw= X-Received: by 2002:a17:902:c395:b029:d7:cdcd:76bc with SMTP id g21-20020a170902c395b02900d7cdcd76bcmr1261457plg.50.1605653095449; Tue, 17 Nov 2020 14:44:55 -0800 (PST) MIME-Version: 1.0 References: <016b01d6bca9$cf908c20$6eb1a460$@tsinghua.org.cn> <32DFCE3A-D41C-48CA-928A-37011D158AEF@cisco.com> In-Reply-To: From: Gyan Mishra Date: Tue, 17 Nov 2020 17:44:44 -0500 Message-ID: To: Robert Raszuk Cc: "Acee Lindem (acee)" , "Acee Lindem (acee)" , Aijun Wang , Jeff Tantsura , lsr Content-Type: multipart/alternative; boundary="0000000000006306b505b4553ed9" Archived-At: Subject: Re: [Lsr] Prefix Unreachable Announcement Use Cases X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 17 Nov 2020 22:44:58 -0000 --0000000000006306b505b4553ed9 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Thanks Robert! I will work on spelling out the scenario in updated LSR presentation. Thanks Gyan On Tue, Nov 17, 2020 at 5:31 PM Robert Raszuk wrote: > > Yes that is the case where I see some potential use case. > > Especially considering also https://tools.ietf.org/html/rfc5283 - which > by many network operators is very desired, but not configured due to "slo= w > BGP convergence" - pls let's not go there :) > > But again if someone knows how to configure BGP properly I think IGP > speedup would be marginal or even null hence a grain of hesitation if we > should use IGP flooding for it. Maybe in some scenarios ... which PUA > authors need to spell out to move fwd I suppose. > > Cheers, > R. > > > > > > > > > On Tue, Nov 17, 2020 at 9:40 PM Gyan Mishra wrote= : > >> >> Robert >> >> I am recalling now the BGP use case you mentioned. >> >> If the next hop is being summarized between areas which it would be, the >> next hop failure component prefix is now hidden in the summary and now y= ou >> have to wait for BGP timer to pop and route withdrawal. >> >> So for this failure scenario one option is multihop BFD but that does ge= t >> way complicated. >> >> So here the obvious and best use case for PUA would be for the data plan= e >> detection of the next hop component down at which time PUA is sent flood= ed >> and the routers in the other area now set next hop to null for that next >> hop and are forced to converge on alternate next hop. >> >> Let me update the presentation to add this use case. >> >> Thanks >> >> Gyan >> >> On Tue, Nov 17, 2020 at 2:09 PM Gyan Mishra >> wrote: >> >>> Agreed. >>> >>> Robert >>> >>> Can you explain the BGP scenario you had in mind that you have mentione= d >>> a number of times that you think this PUA feature would pertain? >>> >>> I will respond to your other email separately. I was trying to guess >>> as to the BGP next hop use case you were referring to but apparently w= as >>> way off. >>> >>> Thank you >>> >>> Gyan >>> >>> On Tue, Nov 17, 2020 at 9:43 AM Acee Lindem (acee) >>> wrote: >>> >>>> Speaking as WG member: >>>> >>>> >>>> >>>> I think it would be good to hone in on the BGP PE failure convergence >>>> use case as suggested by Robert. It seems there is some interest here >>>> although I=E2=80=99m not convinced the IGP is the right place to solve= this problem. >>>> >>>> >>>> >>>> Thanks, >>>> >>>> Acee >>>> >>>> >>>> >>>> *From: *Lsr on behalf of Gyan Mishra < >>>> hayabusagsm@gmail.com> >>>> *Date: *Tuesday, November 17, 2020 at 4:02 AM >>>> *To: *Robert Raszuk >>>> *Cc: *lsr , Jeff Tantsura , >>>> Aijun Wang , "Acee Lindem (acee)" >>> 40cisco.com@dmarc.ietf.org> >>>> *Subject: *Re: [Lsr] Prefix Unreachable Announcement Use Cases >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> On Tue, Nov 17, 2020 at 3:36 AM Robert Raszuk >>>> wrote: >>>> >>>> >>>> >>>> >>>> >>>> Robert, I believe the original intention was related to having the >>>> data plane converge quickly when summarization is used and flip so tra= ffic >>>> converges from the Active ABR to the Backup ABR. >>>> >>>> >>>> >>>> I do not buy this use case. Flooding within the area is fast such that >>>> both ABRs will get the same info. As mentioned before there is no prac= tical >>>> use of PUA for making any routing or fwd decision on which ABR to use.= If >>>> your ABRs are not connected with min redundancy this draft is a worst = patch >>>> ever to work around such a design. >>>> >>>> >>>> >>>> Gyan> Agreed. The point of PUA in ABR use case is the ability to >>>> track the component prefixes and in case where component is down and >>>> traffic is still forwarded to the ABR and dropped. The other more >>>> important use case is when links are down within the area and the area= is >>>> partitioned and so one ABR has all component prefixes however other AB= R is >>>> missing half the component prefixes. So since the ABR will by default >>>> advertise the summary as long as their is one component UP the summary= is >>>> still advertised. So this use case is severely impacting as now you h= ave >>>> an ECMP path to the other area for the summary via the two ABRs and yo= u >>>> drop half your traffic. So now with PUA the problem is fixed and the = PUA >>>> is sent and now traffic is only sent to the ABR that has the component >>>> prefixes. >>>> >>>> >>>> >>>> Please present us a picture indicating before and after ABRs behaviour= . >>>> >>>> >>>> >>>> Gyan> will do >>>> >>>> >>>> >>>> However PUA can be used in the absence of area segmentation within = a >>>> single area when a link or node fails to converge the data plane quick= ly by >>>> sending PUA for the backup path so the active path. >>>> >>>> >>>> >>>> If there is no area segmentation then there is no summaries. So what >>>> are we missing in the first place ? >>>> >>>> >>>> >>>> Gyan> Sorry I am stating that PUA feature can also be used intra >>>> area where if a link or node goes down to improve data plane convergen= ce. >>>> >>>> >>>> >>>> >>>> >>>> With the IGP tuned with BFD fast detection on ISIS or OSPF links and >>>> LFA & RLFA for MPLS or TI-LFA for SR local protection - with those twe= aks >>>> the convergence is well into sub second. So for Intra area convergenc= e >>>> with all the optimizations mentioned I am not sure how much faster the= data >>>> plane will converge with PUA. >>>> >>>> >>>> >>>> Even without any of the above listed chain of acronymous things will >>>> generally work well intra-area without PUAs. >>>> >>>> >>>> >>>> Gyan> Agreed which is why I mentioned the BGP next hop self use >>>> case if I could figure out how PUA could help there that would be a ma= jor >>>> benefit of PUA. >>>> >>>> >>>> >>>> Thx, >>>> R. >>>> >>>> >>>> >>>> >>>> >>>> -- >>>> >>>> [image: Image removed by sender.] >>>> >>>> >>>> >>>> *Gyan Mishra* >>>> >>>> *Network Solutions Architect * >>>> >>>> >>>> >>>> *M 301 502-1347 13101 Columbia Pike >>>> >>>> >>>> *Silver Spring, MD >>>> >>>> >>>> >>>> >>>> >>>> >>> -- >>> >>> >>> >>> *Gyan Mishra* >>> >>> *Network Solutions A**rchitect * >>> >>> >>> >>> *M 301 502-134713101 Columbia Pike >>> *Silver >>> Spring, MD >>> >>> >>> -- >> >> >> >> *Gyan Mishra* >> >> *Network Solutions A**rchitect * >> >> >> >> *M 301 502-134713101 Columbia Pike >> *Silver >> Spring, MD >> >> >> -- *Gyan Mishra* *Network Solutions A**rchitect * *M 301 502-134713101 Columbia Pike *Silver Spring, MD --0000000000006306b505b4553ed9 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

Thanks Robert!

=
I will work on spelling out the scenario in updated= LSR presentation.=C2=A0

Thanks=C2=A0

Gyan
On Tue, Nov 17, 2020 at 5:31 PM Robert Raszuk <robert@raszuk.net> wrote:

Yes that is the case where I see= some potential use case.=C2=A0

Especially considering a= lso=C2=A0= https://tools.ietf.org/html/rfc5283 - which by many network operators i= s very desired, but not configured due to "slow BGP convergence" = - pls let's not go there :)=C2=A0

But again=C2= =A0if someone knows how to configure=C2=A0BGP properly I think IGP speedup = would be marginal or even null hence a grain of hesitation if we should use= IGP flooding for it. Maybe in some scenarios ... which PUA authors need to= spell out to move fwd I suppose.=C2=A0

Cheers,
R.








On Tue, Nov 17, 2020 at 9:40 = PM Gyan Mishra <hayabusagsm@gmail.com> wrote:

Robert=C2=A0
=

I am recalling now the BGP us= e case you mentioned.

If= the next hop is being summarized between areas which it would be, the next= hop failure component prefix is now hidden in the summary and now you have= to wait for BGP timer to pop and route withdrawal.=C2=A0

So for this failure scenario one option i= s multihop BFD but that does get way complicated.
So here the obvious and best use case for PUA wou= ld be for the data plane detection of the next hop component down at which = time PUA is sent flooded and the routers in the other area now set next hop= to null for that next hop and are forced to converge on alternate next hop= .=C2=A0

Let me update th= e presentation to add this use case.

Thanks

Gyan=

On Tue, Nov 17, 2020 at 2:09 PM Gyan Mishra <hayabusagsm@gmail.com> wrote:
Agreed.

Robert=C2=A0

Can you explain the BGP sc= enario you had in mind that you have mentioned a number of times that you t= hink this PUA feature would pertain?

I will respond to your other email separately.=C2=A0 I was try= ing to guess =C2=A0as to the BGP next hop use case you were referring to bu= t apparently was way off.

Thank you=C2=A0

Gyan

On Tue, Nov 17, 2020 at 9:43 AM Acee Lindem (acee) <acee@cisco.com> wrote:
<= blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-l= eft:1px solid rgb(204,204,204);padding-left:1ex">

Speaking as WG member:

=C2=A0

I think it would be good to hone in on the BGP PE fa= ilure convergence use case as suggested by Robert. It seems there is some i= nterest here although I=E2=80=99m not convinced the IGP is the right place = to solve this problem.

=C2=A0

Thanks,

Acee

=C2=A0

From: Lsr <lsr-bounces@ietf.org> o= n behalf of Gyan Mishra <hayabusagsm@gmail.com>
Date: Tuesday, November 17, 2020 at 4:02 AM
To: Robert Raszuk <robert@raszuk.net>
Cc: lsr <lsr@ie= tf.org>, Jeff Tantsura <jefftant.ietf@gmail.com>, Aijun Wang <wangaijun@tsinghua.= org.cn>, "Acee Lindem (acee)" <acee=3D40cisco.com@dmarc.ietf.org>
Subject: Re: [Lsr] Prefix Unreachable Announcement Use Cases<= u>

=C2=A0

=C2=A0

=C2=A0

=C2=A0

=C2=A0

=C2=A0 =C2=A0Robert, I b= elieve the original intention was related to having the data plane converge= quickly when summarization is used and flip so traffic converges from the = Active ABR to the Backup ABR.=C2=A0

=C2=A0

I do not buy this use ca= se. Flooding within the area is fast such that both ABRs will get the same = info. As mentioned before there is no practical use of PUA for making any r= outing or fwd decision on which ABR to use. If your ABRs are not connected with min redundancy this draft is a wo= rst patch ever to work around such a design.=C2=A0

=C2=A0

=C2=A0 =C2=A0Gyan> Ag= reed.=C2=A0 The point of PUA in ABR use case is the ability to track the co= mponent prefixes and in case where component is down and traffic is still f= orwarded to the ABR and dropped.=C2=A0 The other more important use case is when links are down within the area and the area is partitione= d and so one ABR has all component prefixes however other ABR is missing ha= lf the component prefixes.=C2=A0 So since the ABR will by default advertise= the summary as long as their is one component UP the summary is still advertised.=C2=A0 So this use case is se= verely impacting as now you have an ECMP path to the other area for the sum= mary via the two ABRs and you drop half your traffic.=C2=A0 So now with PUA= the problem is fixed and the PUA is sent and now traffic is only sent to the ABR that has the component prefixes.

=C2=A0

Please present us a pict= ure indicating before and after ABRs behaviour.=C2=A0

=C2=A0

=C2=A0 =C2=A0 =C2=A0Gyan= > will do=C2=A0

=C2=A0

=C2=A0 =C2=A0However PUA= can be used in the absence of area segmentation within a single area when = a link or node fails to converge the data plane quickly by sending PUA for = the backup path so the active path.=C2=A0

=C2=A0

If there is no area segm= entation then there is no summaries. So what are we missing in the first pl= ace ?=C2=A0

=C2=A0

=C2=A0 =C2=A0 Gyan> S= orry I am stating that PUA feature can also be used intra area where if a l= ink or node goes down to improve data plane convergence.

=C2=A0

=C2=A0

With the IGP tuned with = BFD fast detection on ISIS or OSPF links and LFA & RLFA for MPLS or TI-= LFA for SR local protection - with those tweaks the convergence is well int= o sub second.=C2=A0 So for Intra area convergence with all the optimizations mentioned I am not sure how much faster the dat= a plane will converge with PUA.

=C2=A0

Even without any of the = above listed chain of acronymous things will generally work well intra-area= without PUAs.=C2=A0

=C2=A0

=C2=A0 =C2=A0 Gyan> A= greed which is why I mentioned the BGP next hop self use case if I could fi= gure out how PUA could help there that would be a major benefit of PUA.<= /u>

=C2=A0

Thx,
R.

=C2=A0

=C2=A0

--

<= /p>

Gyan Mishra<= /u>

Network Solutions = Architect=C2=A0

M 301 502-1347
13101 Colum= bia Pike=C2=A0=
Silver Spring, MD

<= a href=3D"https://www.google.com/maps/search/13101+Columbia+Pike+%C2%A0+%0D= %0A+Silver+Spring,+MD?entry=3Dgmail&source=3Dg">

=C2=A0

--


Gyan Mishra

= Network Solutions Architect=C2=A0

M 301 502-1347<= br>13101 Columbia Pike= =C2=A0
Silver Spring, MD


--


Gyan Mishra

= Network Solutions Architect=C2=A0

M 301 502-1347<= br>13101 Columbia Pike=C2=A0
Silver Spring= , MD


=
--
--0000000000006306b505b4553ed9-- From nobody Tue Nov 17 18:26:49 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6CB943A12A7 for ; Tue, 17 Nov 2020 18:26:46 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.886 X-Spam-Level: X-Spam-Status: No, score=-1.886 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_KAM_HTML_FONT_INVALID=0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id yDJETyHj3vha for ; Tue, 17 Nov 2020 18:26:42 -0800 (PST) Received: from mail-m127101.qiye.163.com (mail-m127101.qiye.163.com [115.236.127.101]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id C330D3A1225 for ; Tue, 17 Nov 2020 18:26:41 -0800 (PST) Received: from DESKTOP2IOH5QC (unknown [219.142.69.75]) by mail-m127101.qiye.163.com (Hmail) with ESMTPA id 3813743AEC; Wed, 18 Nov 2020 10:26:37 +0800 (CST) From: "Aijun Wang" To: "'Acee Lindem \(acee\)'" Cc: "'lsr'" References: <160539745568.19790.10758399794139845841@ietfa.amsl.com> <016a01d6bca7$f8753700$e95fa500$@chinatelecom.cn> In-Reply-To: Date: Wed, 18 Nov 2020 10:26:36 +0800 Message-ID: <00fa01d6bd52$3daacce0$b90066a0$@tsinghua.org.cn> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00FB_01D6BD95.4BD315F0" X-Mailer: Microsoft Outlook 16.0 Thread-Index: AQIF418f17swSsDbQCwbOqY53zNVtACzAfTgAZb9mxqpXIFPwA== Content-Language: zh-cn X-HM-Spam-Status: e1kfGhgUHx5ZQUtXWQgYFAkeWUFZS1VLWVdZKFlBSkxLS0o3V1ktWUFJV1 kPCRoVCBIfWUFZTkxLQkNPGkMfGEgeVkpNS05NTU1IQkxPT0JVEwETFhoSFyQUDg9ZV1kWGg8SFR 0UWUFZT0tIVUpKS09ISFVLWQY+ X-HM-Sender-Digest: e1kMHhlZQR0aFwgeV1kSHx4VD1lBWUc6NS46ORw6MT8fHQ9RUUkXQzw4 KlYaCzBVSlVKTUtOTU1NSEJDSUtNVTMWGhIXVQwaFRwaEhEOFTsPCBIVHBMOGlUUCRxVGBVFWVdZ EgtZQVlJSkJVSk9JVU1CVUxOWVdZCAFZQUlNT0JONwY+ X-HM-Tid: 0a75d92cdc7d9865kuuu3813743aec Archived-At: Subject: Re: [Lsr] New Version Notification for draft-wang-lsr-passive-interface-attribute-06.txt X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 18 Nov 2020 02:26:46 -0000 This is a multipart message in MIME format. ------=_NextPart_000_00FB_01D6BD95.4BD315F0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Hi, Acee: =20 -----Original Message----- From: lsr-bounces@ietf.org On Behalf Of Acee = Lindem (acee) Sent: Wednesday, November 18, 2020 2:47 AM To: Aijun Wang Cc: 'lsr' Subject: Re: [Lsr] New Version Notification for = draft-wang-lsr-passive-interface-attribute-06.txt =20 Speaking as WG member and longtime steward of the IGPs: =20 Hi Aijun,=20 =20 My opinion is that we should not overload the base IGP topology = advertisements with everyone's favorite obscure use case. Hence, I think = it would be a big mistake to add this stub link TLV to the base LSAs.=20 [WAJ] Putting the information in other regular TLVs, or putting them in = LSA of one independent IGP instance(as you proposed in 109 meeting) will = be more expensive. Do you agree this statement? =20 Rather, exactly what problem are you trying to solve? Previously, you = were trying to associate the passive interface attribute with a prefix = and making some inference related to an inter-AS boundary (this was not = entirely clear). What problem are you trying to solve? Precisely, what = do you want the controller to learn (i.e., address or interface index) = and what is it going to do with it. [WAJ] Passive Interfaces are already deployed within the network in many = places, as stated in the = draft-wang-lsr-passive-interface-attribute-06#section-1 = . What we want to know, is the position of = passive interface. Previously, we want piggyback such information within = its associated prefix, but after discussion on the mail list, define one = new TLV to contain it and other future information may be more = acceptable and extensible. Knowing these information, the controller can learn the inter-as links = via some methods that we have discussed in another thread, can know the = boundary of network, can learn the link characteristic that associated = with server etc. We have also mentioned it in the = draft-wang-lsr-passive-interface-attribute-06#section-1 = and think it is not appropriate to expand it = intensely in one LSR draft. =20 Please don't try and solve the CFN problem as the requirements are not = clear (anycast, unicast, impact on routing, scope, etc).=20 [WAJ] In your 109 meeting presentation = slides-109-lsr-5-ospf-transport-instance-00 = , you mentioned also the similar information = that should be transferred via the OSPF protocol. I think this is the = direction and we can prepare for it in advance. Putting such non-routing = information in one independent TLV can certainly keep the stability of = IGP protocol.=20 =20 =20 =20 Thanks, Acee =20 =EF=BB=BFOn 11/17/20, 1:08 AM, " = = wangaj3@chinatelecom.cn on behalf of Aijun Wang" < = wangaj3@chinatelecom.cn> wrote: =20 Hi, Acee: =20 As discussed on the list and during the 109 meeting, we have updated = the draft to reflect the comments from the LSR community. Please see whether you have still other concerns or not and if there = is no further comments on this direction, can we begin the WG adoption = call then? Thanks you and Peter for your intense discussions for this draft. =20 Thanks in advance. =20 Best Regards =20 Aijun Wang China Telecom =20 > -----Original Message----- > From: internet-drafts@ietf.org = < internet-drafts@ietf.org> > Sent: Sunday, November 15, 2020 7:44 AM > To: Zhibo Hu < huzhibo@huawei.com>; = Aijun Wang > < wangaj3@chinatelecom.cn>; Gyan = S. Mishra < = gyan.s.mishra@verizon.com>; > Gyan Mishra < = gyan.s.mishra@verizon.com> > Subject: New Version Notification for > draft-wang-lsr-passive-interface-attribute-06.txt >=20 >=20 > A new version of I-D, = draft-wang-lsr-passive-interface-attribute-06.txt > has been successfully submitted by Aijun Wang and posted to the = IETF > repository. >=20 > Name: draft-wang-lsr-passive-interface-attribute > Revision: 06 > Title: Passive Interface Attribute > Document date: 2020-11-15 > Group: Individual Submission > Pages: 10 > URL: > = = https://www.ietf.org/archive/id/draft-wang-lsr-passive-interface-attribut= e-06.t > xt > Status: > = = https://datatracker.ietf.org/doc/draft-wang-lsr-passive-interface-attribu= te/ > Htmlized: > = = https://datatracker.ietf.org/doc/html/draft-wang-lsr-passive-interface-at= tribut > e > Htmlized: > = = https://tools.ietf.org/html/draft-wang-lsr-passive-interface-attribute-06= > Diff: > = = https://www.ietf.org/rfcdiff?url2=3Ddraft-wang-lsr-passive-interface-attr= ibute-06 >=20 > Abstract: > This document describes the mechanism that can be used to > differentiate the passive interfaces from the normal interfaces > within ISIS or OSPF domain. >=20 >=20 >=20 >=20 > Please note that it may take a couple of minutes from the time of = submission > until the htmlized version and diff are available at = tools.ietf.org. >=20 > The IETF Secretariat >=20 =20 =20 =20 _______________________________________________ Lsr mailing list Lsr@ietf.org = https://www.ietf.org/mailman/listinfo/lsr ------=_NextPart_000_00FB_01D6BD95.4BD315F0 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable ------=_NextPart_000_00FB_01D6BD95.4BD315F0-- From nobody Tue Nov 17 18:36:42 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id ECF153A12BC for ; Tue, 17 Nov 2020 18:36:40 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.896 X-Spam-Level: X-Spam-Status: No, score=-1.896 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=unavailable autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 2lSknKOCb1qD for ; Tue, 17 Nov 2020 18:36:38 -0800 (PST) Received: from frasgout.his.huawei.com (frasgout.his.huawei.com [185.176.79.56]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 47DED3A12BA for ; Tue, 17 Nov 2020 18:36:38 -0800 (PST) Received: from fraeml703-chm.china.huawei.com (unknown [172.18.147.207]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4CbRhs1DdCz67FGC; Wed, 18 Nov 2020 10:34:21 +0800 (CST) Received: from dggema718-chm.china.huawei.com (10.3.20.82) by fraeml703-chm.china.huawei.com (10.206.15.52) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1913.5; Wed, 18 Nov 2020 03:36:33 +0100 Received: from dggema769-chm.china.huawei.com (10.1.198.211) by dggema718-chm.china.huawei.com (10.3.20.82) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1913.5; Wed, 18 Nov 2020 10:36:32 +0800 Received: from dggema769-chm.china.huawei.com ([10.9.128.71]) by dggema769-chm.china.huawei.com ([10.9.128.71]) with mapi id 15.01.1913.007; Wed, 18 Nov 2020 10:36:31 +0800 From: Huzhibo To: "tony.li@tony.li" , Aijun Wang CC: lsr , Jeff Tantsura , Robert Raszuk , "Acee Lindem (acee)" Thread-Topic: [Lsr] Prefix Unreachable Announcement Use Cases Thread-Index: AQHWus275EEkcvdE9EaQpI0Pj8h7tKnHr8AAgAAjWgCAAKr9gIAAKWQAgAA53ICAAC4pAIAACZYAgAB2YICAAFjhAIAAJG8AgAFLHwCAAALfAIAB1KSg 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Transport; Wed, 18 Nov 2020 03:41:43 +0100 Received: from DGGEML524-MBX.china.huawei.com ([169.254.1.26]) by dggeml424-hub.china.huawei.com ([10.1.199.41]) with mapi id 14.03.0487.000; Wed, 18 Nov 2020 10:41:38 +0800 From: wangyali To: Tony Li CC: "lsr@ietf.org" Thread-Topic: [Lsr] Discussion on draft-wang-lsr-hbh-process-00 Thread-Index: Ada82OyMvrt+bmvfQAirzZLC7BtpUf//2Z+A//7svbA= Date: Wed, 18 Nov 2020 02:41:38 +0000 Message-ID: <1520992FC97B944A9979C2FC1D7DB0F4050C56DA@dggeml524-mbx.china.huawei.com> References: <1520992FC97B944A9979C2FC1D7DB0F4050C4193@dggeml524-mbx.china.huawei.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.108.243.136] Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: Re: [Lsr] Discussion on draft-wang-lsr-hbh-process-00 X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 18 Nov 2020 02:41:48 -0000 SGkgVG9ueSwNCg0KVGhhbmtzIGZvciB5b3VyIHF1ZXN0aW9uLiBQbGVhc2Ugc2VlIGluIGxpbmUg W1lhbGldLiANClBsZWFzZSBsZXQgbWUga25vdyB5b3VyIG9waW5pb25zLg0KDQpCZXN0LA0KWWFs aQ0KDQotLS0tLU9yaWdpbmFsIE1lc3NhZ2UtLS0tLQ0KRnJvbTogVG9ueSBMaSBbbWFpbHRvOnRv bnkxYXRob21lQGdtYWlsLmNvbV0gDQpTZW50OiBXZWRuZXNkYXksIE5vdmVtYmVyIDE4LCAyMDIw IDE6NDEgQU0NClRvOiB3YW5neWFsaSA8d2FuZ3lhbGkxMUBodWF3ZWkuY29tPg0KQ2M6IGxzckBp ZXRmLm9yZw0KU3ViamVjdDogUmU6IFtMc3JdIERpc2N1c3Npb24gb24gZHJhZnQtd2FuZy1sc3It aGJoLXByb2Nlc3MtMDANCg0KDQoNCj4gUTE6IGFyZSB5b3UgdXNpbmcgdGhpcyBpbmZvcm1hdGlv biB0byBkZXRlcm1pbmUgdGhlIHJvdXRpbmcgdG8gdGhlIG5ldHdvcms/IA0KPiBPbiBvbmUgaGFu ZCwgc3VjaCBhZHZlcnRpc2VtZW50IGRvZXMgbm90IGVmZmVjdCBvbiB0aGUgbm9ybWFsIFNQRiBj b21wdXRhdGlvbiBhbmQgbWF5IGJlIHVzZWZ1bCBmb3IgdHJhZmZpYyBlbmdpbmVlcmluZy4gRm9y 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mail-pj1-x1032.google.com (mail-pj1-x1032.google.com [IPv6:2607:f8b0:4864:20::1032]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 141FC3A1374 for ; Tue, 17 Nov 2020 19:34:12 -0800 (PST) Received: by mail-pj1-x1032.google.com with SMTP id g19so1267147pji.0 for ; Tue, 17 Nov 2020 19:34:12 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:to:cc:message-id:in-reply-to:references:subject :mime-version; bh=ew+BPf9PC3rAzr+dVjqgKr5hBD/LPLYmGIYXjDELTIk=; b=B4e2rL82aDPwChfdn1yNN5fdxoX5qpHexQ/YjSwbDopdGTpdkl4xuy/uxulmaSEKBB VZdh6S7gTs1ljS0oZtLe5ND+8LgyWpCuNSz84fnTmwYqxHFHXNuxwHe5OENnNxZTdSik aTYLS5jIo9U5MfvdyHaEJVTPIlS3GDMJtjnQU3a4soIEhUlt/N7Xq+MPIWfneeP+yG+q BHoU4mqM8I9R4y41J63mBDmmnjRpEhYKnWf16ZUZYNxzX62u/DeCmF+soprLM/+p3SfU dmdDhb6/fhUDXfxVNUtO4GTQOypM9HglUXaZuQck/lPM0dP5Tqz+o2d4jRKLF/G5P5l5 4nWA== X-Google-DKIM-Signature: v=1; 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[73.63.232.212]) by smtp.gmail.com with ESMTPSA id l20sm592354pjq.33.2020.11.17.19.34.09 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Tue, 17 Nov 2020 19:34:10 -0800 (PST) Date: Tue, 17 Nov 2020 19:33:59 -0800 From: Jeff Tantsura To: Gyan Mishra , Robert Raszuk , "Acee Lindem (acee)" Cc: lsr , Aijun Wang , "Acee Lindem (acee)" Message-ID: In-Reply-To: <32DFCE3A-D41C-48CA-928A-37011D158AEF@cisco.com> References: <016b01d6bca9$cf908c20$6eb1a460$@tsinghua.org.cn> <32DFCE3A-D41C-48CA-928A-37011D158AEF@cisco.com> X-Readdle-Message-ID: c646fecb-2d45-4ece-adc1-eb0635a58c3c@Spark MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="5fb49630_24e99dd7_ba5e" Archived-At: Subject: Re: [Lsr] Prefix Unreachable Announcement Use Cases X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 18 Nov 2020 03:34:18 -0000 --5fb49630_24e99dd7_ba5e Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Content-Disposition: inline We have been discussing for quite some time and in different wg's (there=E2= =80=99s IX with RS use case) B=46D verification based on next-hop extract= ion, Robert - you should know. (also built a well working prototype in pr= evious life). Very simple logic: Upon route import (BGP update received and imported), extract next-hop, w= alk B=46D session table, if no match (no existing session) - establish (S= )B=46D session (Discriminators distribution is a solved problem) to the n= ext-hop, associate fate of all routes received from it, keep timers reaso= nable to prevent false positives. State is limited to PE=E2=80=99s importing each others routes (sharing a = service) only High degree of automation No IGP pollution Cheers, Jeff On Nov 17, 2020, 6:43 AM -0800, Acee Lindem (acee) , wr= ote: > Speaking as WG member: > > I think it would be good to hone in on the BGP PE failure convergence u= se case as suggested by Robert. It seems there is some interest here alth= ough I=E2=80=99m not convinced the IGP is the right place to solve this p= roblem. > > Thanks, > Acee > > =46rom: Lsr on behalf of Gyan Mishra > Date: Tuesday, November 17, 2020 at 4:02 AM > To: Robert Raszuk > Cc: lsr , Jeff Tantsura , Ai= jun Wang , =22Acee Lindem (acee)=22 > Subject: Re: =5BLsr=5D Prefix Unreachable Announcement Use Cases > > > > On Tue, Nov 17, 2020 at 3:36 AM Robert Raszuk wro= te: > > quote=5Ftype > > > > > > > quote=5Ftype > > > =C2=A0 =C2=A0Robert, I believe the original intention was related t= o having the data plane converge quickly when summarization is used and f= lip so traffic converges from the Active ABR to the Backup ABR. > > > > I do not buy this use case. =46looding within the area is fast such t= hat both ABRs will get the same info. As mentioned before there is no pra= ctical use of PUA for making any routing or fwd decision on which ABR to = use. If your ABRs are not connected with min redundancy this draft is a w= orst patch ever to work around such a design. > > =C2=A0 =C2=A0Gyan> Agreed.=C2=A0 The point of PUA in ABR use case is th= e ability to track the component prefixes and in case where component is = down and traffic is still forwarded to the ABR and dropped.=C2=A0 The oth= er more important use case is when links are down within the area and the= area is partitioned and so one ABR has all component prefixes however ot= her ABR is missing half the component prefixes.=C2=A0 So since the ABR wi= ll by default advertise the summary as long as their is one component UP = the summary is still advertised.=C2=A0 So this use case is severely impac= ting as now you have an ECMP path to the other area for the summary via t= he two ABRs and you drop half your traffic.=C2=A0 So now with PUA the pro= blem is fixed and the PUA is sent and now traffic is only sent to the ABR= that has the component prefixes. > > quote=5Ftype > > > > Please present us a picture indicating before and after ABRs behaviou= r. > > =C2=A0 =C2=A0 =C2=A0Gyan> will do > > quote=5Ftype > > > > > quote=5Ftype > > > =C2=A0 =C2=A0However PUA can be used in the absence of area segment= ation within a single area when a link or node fails to converge the data= plane quickly by sending PUA for the backup path so the active path. > > > > If there is no area segmentation then there is no summaries. So what = are we missing in the first place =3F > > =C2=A0 =C2=A0 Gyan> Sorry I am stating that PUA feature can also be use= d intra area where if a link or node goes down to improve data plane conv= ergence. > > quote=5Ftype > > > > > > > quote=5Ftype > > > With the IGP tuned with B=46D fast detection on ISIS or OSP=46 link= s and L=46A & RL=46A for MPLS or TI-L=46A for SR local protection - with = those tweaks the convergence is well into sub second.=C2=A0 So for Intra = area convergence with all the optimizations mentioned I am not sure how m= uch faster the data plane will converge with PUA. > > > > Even without any of the above listed chain of acronymous things will = generally work well intra-area without PUAs. > > =C2=A0 =C2=A0 Gyan> Agreed which is why I mentioned the BGP next hop se= lf use case if I could figure out how PUA could help there that would be = a major benefit of PUA. > > quote=5Ftype > > > > Thx, > > R. > > > > > -- > <> > Gyan Mishra > Network Solutions Architect > M 301 502-1347 > 13101 Columbia Pike > Silver Spring, MD > --5fb49630_24e99dd7_ba5e Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable Content-Disposition: inline
We have been discussing for quite some time and in = different wg's (there=E2=80=99s IX with RS use case) B=46D verification b= ased on next-hop extraction, Robert - you should know. (also built a well= working prototype in previous life).&=23160;

Very simple logic:

Upon route import (BGP update received and imported), extract next-hop, w= alk B=46D session table, if no match (no existing session) - establish (S= )B=46D session (Discriminators distribution is a solved problem) to the n= ext-hop, associate fate of all routes received from it, keep timers reaso= nable to prevent false positives.

State is limited to PE=E2=80=99s importing each others routes (sharing a = service) only
High degree of automation
No IGP pollution&=23160;

Cheers,
Jeff
On Nov 17, 2020, 6:43 AM -0800, Ace= e Lindem (acee) <acee=40cisco.com>, wrote:

Speaking as WG member:

&=23160;

I think it would be good to hone in on the BGP= PE failure convergence use case as suggested by Robert. It seems there i= s some interest here although I=E2=80=99m not convinced the IGP is the ri= ght place to solve this problem.

&=23160;

Thanks,

Acee

&=23160;

=46rom: Lsr <lsr-bounces=40ietf.org> on behal= f of Gyan Mishra <hayabusagsm=40gmail.com>
Date: Tuesday, November 17, 2020 at 4:02 AM
To: Robert Raszuk <robert=40raszuk.net>
Cc: lsr <lsr=40ietf.org>, Jeff Tantsura <jefftant.ietf=40= gmail.com>, Aijun Wang <wangaijun=40tsinghua.org.cn>, =22Acee Li= ndem (acee)=22 <acee=3D40cisco.com=40dmarc.ietf.org>
Subject: Re: =5BLsr=5D Prefix Unreachable Announcement Use Cases

&=23160;

&=23160;

&=23160;

On Tue, Nov 17,= 2020 at 3:36 AM Robert Raszuk <robert=40raszuk.net> wrote:

&=23160;

&=23160;

&=23160; &=2316= 0;Robert, I believe the original intention was related to having the data= plane converge quickly when summarization is used and flip so traffic co= nverges from the Active ABR to the Backup ABR.&=23160;

&=23160;

I do not buy th= is use case. =46looding within the area is fast such that both ABRs will = get the same info. As mentioned before there is no practical use of PUA f= or making any routing or fwd decision on which ABR to use. If your ABRs a= re not connected with min redundancy this draft is a worst patch ever to = work around such a design.&=23160;

&=23160;

&=23160; &=2316= 0;Gyan> Agreed.&=23160; The point of PUA in ABR use case is the abilit= y to track the component prefixes and in case where component is down and= traffic is still forwarded to the ABR and dropped.&=23160; The other mor= e important use case is when links are down within the area and the area = is partitioned and so one ABR has all component prefixes however other AB= R is missing half the component prefixes.&=23160; So since the ABR will b= y default advertise the summary as long as their is one component UP the = summary is still advertised.&=23160; So this use case is severely impacti= ng as now you have an ECMP path to the other area for the summary via the= two ABRs and you drop half your traffic.&=23160; So now with PUA the pro= blem is fixed and the PUA is sent and now traffic is only sent to the ABR= that has the component prefixes.

&=23160;

Please present = us a picture indicating before and after ABRs behaviour.&=23160;

&=23160;

&=23160; &=2316= 0; &=23160;Gyan> will do&=23160;

&=23160;

&=23160; &=2316= 0;However PUA can be used in the absence of area segmentation within a si= ngle area when a link or node fails to converge the data plane quickly by= sending PUA for the backup path so the active path.&=23160;

&=23160;

If there is no = area segmentation then there is no summaries. So what are we missing in t= he first place =3F&=23160;

&=23160;

&=23160; &=2316= 0; Gyan> Sorry I am stating that PUA feature can also be used intra ar= ea where if a link or node goes down to improve data plane convergence.

&=23160;

&=23160;

With the IGP tu= ned with B=46D fast detection on ISIS or OSP=46 links and L=46A & RL=46= A for MPLS or TI-L=46A for SR local protection - with those tweaks the co= nvergence is well into sub second.&=23160; So for Intra area convergence = with all the optimizations mentioned I am not sure how much faster the da= ta plane will converge with PUA.

&=23160;

Even without an= y of the above listed chain of acronymous things will generally work well= intra-area without PUAs.&=23160;

&=23160;

&=23160; &=2316= 0; Gyan> Agreed which is why I mentioned the BGP next hop self use cas= e if I could figure out how PUA could help there that would be a major be= nefit of PUA.

&=23160;

Thx,
R.

&=23160;

&=23160;

--

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mail-m127101.qiye.163.com (mail-m127101.qiye.163.com [115.236.127.101]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 98DFB3A0C0A for ; Tue, 17 Nov 2020 23:05:57 -0800 (PST) Received: from DESKTOP2IOH5QC (unknown [219.142.69.75]) by mail-m127101.qiye.163.com (Hmail) with ESMTPA id 4755C45688; Wed, 18 Nov 2020 15:05:53 +0800 (CST) From: "Aijun Wang" To: "'Acee Lindem \(acee\)'" Cc: "'lsr'" References: <160539745568.19790.10758399794139845841@ietfa.amsl.com> <016a01d6bca7$f8753700$e95fa500$@chinatelecom.cn> <00fa01d6bd52$3daacce0$b90066a0$@tsinghua.org.cn> <2DF4A6D0-E410-4652-977C-258A0D2950D5@cisco.com> In-Reply-To: <2DF4A6D0-E410-4652-977C-258A0D2950D5@cisco.com> Date: Wed, 18 Nov 2020 15:05:52 +0800 Message-ID: <018101d6bd79$41038310$c30a8930$@tsinghua.org.cn> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0182_01D6BDBC.4F28E5F0" X-Mailer: Microsoft Outlook 16.0 Thread-Index: AQIF418f17swSsDbQCwbOqY53zNVtACzAfTgAZb9mxoCBhw1SQJ4FQG3qTjbvvA= Content-Language: zh-cn X-HM-Spam-Status: e1kfGhgUHx5ZQUtXWQgYFAkeWUFZS1VLWVdZKFlBSkxLS0o3V1ktWUFJV1 kPCRoVCBIfWUFZTB5JGkNOGENIQhkfVkpNS05NQ0hKTkhPTEJVEwETFhoSFyQUDg9ZV1kWGg8SFR 0UWUFZT0tIVUpKS0hKTFVLWQY+ X-HM-Sender-Digest: e1kMHhlZQR0aFwgeV1kSHx4VD1lBWUc6OE06NBw5KD8uIw9WFE0RTzUN HD9PFFZVSlVKTUtOTUNISk5PS0NPVTMWGhIXVQwaFRwaEhEOFTsPCBIVHBMOGlUUCRxVGBVFWVdZ EgtZQVlJSkJVSk9JVU1CVUxOWVdZCAFZQU9ITEhONwY+ X-HM-Tid: 0a75da2c89cf9865kuuu4755c45688 Archived-At: Subject: Re: [Lsr] New Version Notification for draft-wang-lsr-passive-interface-attribute-06.txt X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 18 Nov 2020 07:06:02 -0000 This is a multipart message in MIME format. ------=_NextPart_000_0182_01D6BDBC.4F28E5F0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Hi, Acee: =20 From: Acee Lindem (acee) =20 Sent: Wednesday, November 18, 2020 12:39 PM To: Aijun Wang Cc: 'lsr' Subject: Re: [Lsr] New Version Notification for = draft-wang-lsr-passive-interface-attribute-06.txt =20 From: Aijun Wang > Date: Tuesday, November 17, 2020 at 9:27 PM To: Acee Lindem > Cc: 'lsr' > Subject: RE: [Lsr] New Version Notification for = draft-wang-lsr-passive-interface-attribute-06.txt =20 Hi, Acee: =20 -----Original Message----- From: lsr-bounces@ietf.org = > On Behalf Of Acee = Lindem (acee) Sent: Wednesday, November 18, 2020 2:47 AM To: Aijun Wang = > Cc: 'lsr' > Subject: Re: [Lsr] New Version Notification for = draft-wang-lsr-passive-interface-attribute-06.txt =20 Speaking as WG member and longtime steward of the IGPs: =20 Hi Aijun,=20 =20 My opinion is that we should not overload the base IGP topology = advertisements with everyone's favorite obscure use case. Hence, I think = it would be a big mistake to add this stub link TLV to the base LSAs.=20 [WAJ] Putting the information in other regular TLVs, or putting them in = LSA of one independent IGP instance(as you proposed in 109 meeting) will = be more expensive. Do you agree this statement? =20 No =E2=80=93 bloating the primary LSAs with non-routing information will = be more expensive due to the dynamics of LSA origination and route = computation.=20 [WAJ] what=E2=80=99s your recommendation then? The router can skip such = information when they do SPF calculation, just need only add the = information to the attached leaf router when the computation is = completed. The LSA update is periodic and event driven. Advertising such = information in a controlled manner does not deteriorate the flooding = status.=20 =20 Rather, exactly what problem are you trying to solve? Previously, you = were trying to associate the passive interface attribute with a prefix = and making some inference related to an inter-AS boundary (this was not = entirely clear). What problem are you trying to solve? Precisely, what = do you want the controller to learn (i.e., address or interface index) = and what is it going to do with it. [WAJ] Passive Interfaces are already deployed within the network in many = places, as stated in the = draft-wang-lsr-passive-interface-attribute-06#section-1 = . What we want to know, is the position of = passive interface. Previously, we want piggyback such information within = its associated prefix, but after discussion on the mail list, define one = new TLV to contain it and other future information may be more = acceptable and extensible. =20 And how do identify and even define the position of the passive = interface?=20 [WAJ] Passive interface be certainly attached the router that advertises = the associated stub-link TLV. =20 =20 As I stated previously, passive interfaces are not standardized.=20 [WAJ] if you mentioned just the term, we can change it later. Or if so, = what=E2=80=99s other term do you recommend then? =20 Knowing these information, the controller can learn the inter-as links = via some methods that we have discussed in another thread, can know the = boundary of network, can learn the link characteristic that associated = with server etc. We have also mentioned it in the = draft-wang-lsr-passive-interface-attribute-06#section-1 = and think it is not appropriate to expand it = intensely in one LSR draft. =20 I disagree. Precisely define your use case.=20 [WAJ] which part of the introduction section is not clear enough? There = are about 3 possible use cases of such information, aren=E2=80=99t they = enough? And, we have described one use case in detail in previous version of = this draft draft-wang-lsr-passive-interface-attribute-04#section-3 = . If necessary, we can add it back again in the next = version. This is just one use case, you can also refer to = draft-dunbar-lsr-5g-edge-compute-ospf-ext-01 = for the detail of another use case. =20 =20 =20 =20 Please don't try and solve the CFN problem as the requirements are not = clear (anycast, unicast, impact on routing, scope, etc).=20 [WAJ] In your 109 meeting presentation = slides-109-lsr-5-ospf-transport-instance-00 = , you mentioned also the similar information = that should be transferred via the OSPF protocol. I think this is the = direction and we can prepare for it in advance. Putting such non-routing = information in one independent TLV can certainly keep the stability of = IGP protocol.=20 =20 This was just an example of something that could be offloaded to a = separate instance in the slides. It is not a specification.=20 =20 Thanks, Acee =20 =20 =20 Thanks, Acee =20 On 11/17/20, 1:08 AM, " = = wangaj3@chinatelecom.cn on behalf of Aijun Wang" < = wangaj3@chinatelecom.cn> wrote: =20 Hi, Acee: =20 As discussed on the list and during the 109 meeting, we have updated = the draft to reflect the comments from the LSR community. Please see whether you have still other concerns or not and if there = is no further comments on this direction, can we begin the WG adoption = call then? Thanks you and Peter for your intense discussions for this draft. =20 Thanks in advance. =20 Best Regards =20 Aijun Wang China Telecom =20 > -----Original Message----- > From: internet-drafts@ietf.org = < internet-drafts@ietf.org> > Sent: Sunday, November 15, 2020 7:44 AM > To: Zhibo Hu < huzhibo@huawei.com>; = Aijun Wang > < wangaj3@chinatelecom.cn>; Gyan = S. Mishra < = gyan.s.mishra@verizon.com>; > Gyan Mishra < = gyan.s.mishra@verizon.com> > Subject: New Version Notification for > draft-wang-lsr-passive-interface-attribute-06.txt >=20 >=20 > A new version of I-D, = draft-wang-lsr-passive-interface-attribute-06.txt > has been successfully submitted by Aijun Wang and posted to the = IETF > repository. >=20 > Name: draft-wang-lsr-passive-interface-attribute > Revision: 06 > Title: Passive Interface Attribute > Document date: 2020-11-15 > Group: Individual Submission > Pages: 10 > URL: > = = https://www.ietf.org/archive/id/draft-wang-lsr-passive-interface-attribut= e-06.t > xt > Status: > = = https://datatracker.ietf.org/doc/draft-wang-lsr-passive-interface-attribu= te/ > Htmlized: > = = https://datatracker.ietf.org/doc/html/draft-wang-lsr-passive-interface-at= tribut > e > Htmlized: > = = https://tools.ietf.org/html/draft-wang-lsr-passive-interface-attribute-06= > Diff: > = = https://www.ietf.org/rfcdiff?url2=3Ddraft-wang-lsr-passive-interface-attr= ibute-06 >=20 > Abstract: > This document describes the mechanism that can be used to > differentiate the passive interfaces from the normal interfaces > within ISIS or OSPF domain. >=20 >=20 >=20 >=20 > Please note that it may take a couple of minutes from the time of = submission > until the htmlized version and diff are available at = tools.ietf.org. >=20 > The IETF Secretariat >=20 =20 =20 =20 _______________________________________________ Lsr mailing list Lsr@ietf.org = https://www.ietf.org/mailman/listinfo/lsr ------=_NextPart_000_0182_01D6BDBC.4F28E5F0 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable

Hi, = Acee:

 

<= b>From:<= /b> Acee Lindem = (acee) <acee@cisco.com>
Sent: Wednesday, November 18, = 2020 12:39 PM
To: Aijun Wang = <wangaijun@tsinghua.org.cn>
Cc: 'lsr' = <lsr@ietf.org>
Subject: Re: [Lsr] New Version = Notification for = draft-wang-lsr-passive-interface-attribute-06.txt

 

From: = Aijun Wang <wangaijun@tsinghua.org.cn&g= t;
Date: Tuesday, November 17, 2020 at 9:27 PM
To: = Acee Lindem <acee@cisco.com>
Cc: = 'lsr' <lsr@ietf.org>
Subject: RE: = [Lsr] New Version Notification for = draft-wang-lsr-passive-interface-attribute-06.txt

 

Hi, Acee:

 

-----Original Message-----
From: lsr-bounces@ietf.org <lsr-bounces@ietf.org> On = Behalf Of Acee Lindem (acee)
Sent: Wednesday, November 18, 2020 2:47 = AM
To: Aijun Wang <wangaj3@chinatelecom.cn>Cc: 'lsr' <lsr@ietf.org>
Subject: Re: [Lsr] = New Version Notification for = draft-wang-lsr-passive-interface-attribute-06.txt

 

Speaking as WG member and longtime steward  of the = IGPs:

 

Hi Aijun,

 

My opinion is that we should not overload the base IGP = topology advertisements with everyone's favorite obscure use case. = Hence, I think it would be a big mistake to add this stub link TLV to = the base LSAs.

[WAJ] Putting the information in = other regular TLVs, or putting them in LSA of one independent IGP = instance(as you proposed in 109 meeting) will be more expensive. Do you = agree this statement?

 

No =E2=80=93 bloating the = primary LSAs with non-routing information will be more expensive due to = the dynamics of LSA origination and route computation. =

[WAJ] = what=E2=80=99s your recommendation then? The router can skip such = information when they do SPF calculation, just need only add the = information to the attached leaf router when the computation is = completed. The LSA update is periodic and event driven. Advertising such = information in a controlled manner does not deteriorate the flooding = status. =

 

Rather, exactly what problem are you trying to solve? = Previously, you were trying to associate the passive interface attribute = with a prefix and making some inference related to an inter-AS boundary = (this was not entirely clear). What problem are you trying to solve? = Precisely, what do you want the controller to learn (i.e., address or = interface index) and what is it going to do with = it.

[WAJ] Passive Interfaces are already = deployed within the network in many places, as stated in the draft-wang-lsr-passive-interface-attribute-= 06#section-1. What we want to know, is the position of passive = interface. Previously, we want piggyback such information within its = associated prefix, but after discussion on the mail list, define one new = TLV to contain it and other future information may be more acceptable = and extensible.

 

And how do identify and even = define the position of the passive interface?

[WAJ] Passive = interface be certainly attached the router that advertises the = associated stub-link TLV.=C2=A0 =

 <= /span>

As I stated previously, passive = interfaces are not standardized.

[WAJ] if you = mentioned just the term, we can change it later. Or if so, = what=E2=80=99s other term do you recommend then?=

 

Knowing these information, the = controller can learn the inter-as links via some methods that we have = discussed in another thread, can know the boundary of network, can learn = the link characteristic that associated with server etc. We have also = mentioned it in the draft-wang-lsr-passive-interface-attribute-= 06#section-1 and think it is not appropriate to expand it = intensely in one LSR draft.

 

I disagree. Precisely define = your use case.

[WAJ] which part = of the introduction section is not clear enough? There are about 3 = possible use cases of such information, aren=E2=80=99t they = enough?

And, we have = described one use case in detail in previous version of this draft draft-wang-lsr-passive-interface-attribute-04#section= -3. If necessary, we can add it back again in the next version. This = is just one use case, you can also refer to draft-dunbar-lsr-5g-edge-compute-ospf-ext-01 for the detail = of another use case.=C2=A0

 <= /span>

 <= /span>

 

Please don't try and solve the CFN problem as the = requirements are not clear (anycast, unicast, impact on routing, scope, = etc).

[WAJ] In your 109 meeting = presentation slides-109-lsr-5-ospf-transport-instance-0= 0, you mentioned also the similar information that should be = transferred via the OSPF protocol. I think this is the direction and we = can prepare for it in advance. Putting such non-routing information in = one independent TLV can certainly keep the stability of IGP protocol. =

 

This was just an example of = something that could be offloaded to a separate instance in the slides. = It is not a specification.

 

Thanks,

Acee

 

 

 

Thanks,

Acee

 

On 11/17/20, 1:08 AM, "wangaj3@chinatelecom.cn = on behalf of Aijun Wang" <wangaj3@chinatelecom.cn> wrote:

 

    Hi, Acee:

 

    As discussed on the list and during the = 109 meeting, we have updated the draft to reflect the comments from the = LSR community.

    Please see whether you have still other = concerns or not and if there is no further comments on this direction, = can we begin the WG adoption call then?

    Thanks you and Peter for your intense = discussions for this draft.

 

    Thanks in = advance.

 

    Best Regards

 

    Aijun Wang

    China Telecom

 

    > -----Original = Message-----

    > From: internet-drafts@ietf.org<= /span> <internet-drafts@ietf.org<= /span>>

    > Sent: Sunday, November 15, 2020 = 7:44 AM

    > To: Zhibo Hu <huzhibo@huawei.com= >; Aijun Wang

    > <wangaj3@chinatelecom.cn>; Gyan S. Mishra <gyan.s.mishra@verizon.com= >;

    > Gyan Mishra <gyan.s.mishra@verizon.com= >

    > Subject: New Version Notification = for

    > = draft-wang-lsr-passive-interface-attribute-06.txt

    >

    >

    > A new version of I-D, = draft-wang-lsr-passive-interface-attribute-06.txt

    > has been successfully submitted by = Aijun Wang and posted to the IETF

    > repository.

    >

    > = Name:           = draft-wang-lsr-passive-interface-attribute

    > = Revision:       06

    > = Title:           &= nbsp;  Passive Interface Attribute

    > Document date:   = 2020-11-15

    > = Group:          Individual = Submission

    > = Pages:           = 10

    > URL:

    > https://www.ietf.org/arch= ive/id/draft-wang-lsr-passive-interface-attribute-06.t

    > xt

    > Status:

    > https://datatracker.ietf.= org/doc/draft-wang-lsr-passive-interface-attribute/=

    > Htmlized:

    > https://datatracker.ietf.= org/doc/html/draft-wang-lsr-passive-interface-attribut

    > e

    > Htmlized:

    > https://tools.ietf.org/ht= ml/draft-wang-lsr-passive-interface-attribute-06

    > Diff:

    > https://www.ietf.org/rfcd= iff?url2=3Ddraft-wang-lsr-passive-interface-attribute-06<= /o:p>

    >

    > = Abstract:

    >    This document = describes the mechanism that can be used to

    >    differentiate the = passive interfaces from the normal interfaces

    >    within ISIS or = OSPF domain.

    >

    >

    >

    >

    > Please note that it may take a = couple of minutes from the time of submission

    > until the htmlized version and diff = are available at tools.ietf.org.

    >

    > The IETF = Secretariat

    >

 

 

 

_______________________________________________

Lsr mailing list

Lsr@ietf.org

https://www.ietf.org/mail= man/listinfo/lsr

------=_NextPart_000_0182_01D6BDBC.4F28E5F0-- From nobody Tue Nov 17 23:38:43 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3AABA3A0CE3 for ; Tue, 17 Nov 2020 23:38:41 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.098 X-Spam-Level: X-Spam-Status: No, score=-2.098 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=raszuk.net Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id okgeFkfjsbiw for ; Tue, 17 Nov 2020 23:38:39 -0800 (PST) Received: from mail-lf1-x130.google.com (mail-lf1-x130.google.com [IPv6:2a00:1450:4864:20::130]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 74F743A1512 for ; Tue, 17 Nov 2020 23:38:23 -0800 (PST) Received: by mail-lf1-x130.google.com with SMTP id 74so1555206lfo.5 for ; Tue, 17 Nov 2020 23:38:23 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=raszuk.net; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=r3+11cC/4bYBolzdk/6dsNNlW5w0/esX0r25vtQFP7c=; b=TZtStZH5YsPn8C9pMTMsTqXrQ0QnqIVnnlTl7oWk0xpKXyO5FX7fsxOPngFBH6/GOP nll5vMWcjur2x69xqBZe6Bmc2Izf+6MByFOVRatyPx7uCKTQkYhI/3MlPjRXiqagMSOp nfQEwQ3Qyu75XGiZjvD0g5jmbezCupwlc2wuRPB+JCTI40VHj2PE7g6qU+WXmVXXxPz7 5ta40QEVIaX8aKvhd+Xha0d73G/W/dC+SvHfKMIcAvStjTpp7OudIlMjJLCSYsFVyfKB /Z+WiZzzkPcOp+5D5h8g9AYBL67Zj9hL0afz4+8WM5EwxVPTxlnVVQ5834TOc8gfYsCu +uXA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=r3+11cC/4bYBolzdk/6dsNNlW5w0/esX0r25vtQFP7c=; b=BFabsHBuBRmreYD3h0nSnzWEFrhZlbYQ41g0RClyjWPSp1OWVgltNio9Flo8G0EUcj ACzkkwqr94ssvrl2ezddRXDhaHdmC6bbdX1WC3YD0LVsLGG4P7QpeLEgA24mWHLAb0v3 LE3KS/x7ddgS8IAmSQJycPFWvtFVE8AIgYIb10OJTTcImdDZOo+7hkH9AyHOsuu43/xH D08upr3H6YkSOIJa07+3vfwIB1C3QekMRkcLj8jQbFAQNoH/CK/XyvJtlNuaYLztJmzO POEFMqeP0qdzx9nkS0maRd/zeV345Kd3fIYbxqah86fewZswbRQR7j8HxeLaPfIGEyW5 742A== X-Gm-Message-State: AOAM531aa5knVKAsYTHP64Y/lphFNfyQNa1BBrkOz+MDZ5m5V871JXaz A6Lk+DRYRQvdtgRpEaf/qx1fB/P+Mmc/MaVdCCahTw== X-Google-Smtp-Source: ABdhPJwMjGkXg1sMf6YsYiY9SgZJ2n0Ga0umz8ZoRZsVGebgrVp8/Rrt/bwPPsw6+0KoarSUmVNRJNf11xBBWWuV32M= X-Received: by 2002:ac2:5219:: with SMTP id a25mr3306336lfl.264.1605685101596; Tue, 17 Nov 2020 23:38:21 -0800 (PST) MIME-Version: 1.0 References: <016b01d6bca9$cf908c20$6eb1a460$@tsinghua.org.cn> <4CCB3F3C-8537-4072-8763-D4B3C557EBD9@tony.li> In-Reply-To: From: Robert Raszuk Date: Wed, 18 Nov 2020 08:38:11 +0100 Message-ID: To: Huzhibo Cc: "tony.li@tony.li" , Aijun Wang , lsr , Jeff Tantsura , "Acee Lindem (acee)" Content-Type: multipart/alternative; boundary="0000000000001a322905b45cb2cd" Archived-At: Subject: Re: [Lsr] Prefix Unreachable Announcement Use Cases X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 18 Nov 2020 07:38:41 -0000 --0000000000001a322905b45cb2cd Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi Zhibo, > However, if there is a summary or default route in the area, FIB Miss cannot be triggered. If PUA is a /dev/null route this is not a FIB miss. It's a FIB hit. Thx, R. On Wed, Nov 18, 2020 at 3:36 AM Huzhibo wrote: > Hi Tony: > > > > In fact, this protection use case protects the SRv6 mid-point. > https://datatracker.ietf.org/doc/draft-chen-rtgwg-srv6-midpoint-protectio= n/. > When the SRv6 mid-point fails, the PLR node can perform the next SID > operation, which is triggered by FIB miss. However, if there is a summary > or default route in the area, FIB Miss cannot be triggered. > > > > Thanks > > > > Zhibo > > > > *From:* Lsr [mailto:lsr-bounces@ietf.org] *On Behalf Of *tony.li@tony.li > *Sent:* Tuesday, November 17, 2020 2:31 PM > *To:* Aijun Wang > *Cc:* lsr ; Jeff Tantsura ; Robert > Raszuk ; Acee Lindem (acee) 40cisco.com@dmarc.ietf.org> > *Subject:* Re: [Lsr] Prefix Unreachable Announcement Use Cases > > > > > > And how would that help connectivity restoration ? > > *[WAJ] This action will trigger the path protection procedures, which wil= l > divert the traffic to other backup path.* > > > > > > This seems to be making some major assumptions about how path protection > features operate. Those assumptions need to be > > very explicitly called out. > > > > The path protection features that I=E2=80=99m familiar with are triggered= by > topological changes along the existing operable path. A PUA > > does not provide that. Rather, it=E2=80=99s something of a temporary sig= nal > saying =E2=80=99this broke=E2=80=99. Without more specifics about the fai= lure, it=E2=80=99s > difficult to > > understand exactly what path protection should make of this. If a prefix > is unreachable, the obvious implication is that the associated link has > > failed. Path protection in a remote area is highly unlikely to have the > topological details necessary to find an alternate path to that prefix. > > > > Tony > > > --0000000000001a322905b45cb2cd Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

Hi Zhibo,

> However, if there is a summary or defaul= t route in the area, FIB Miss cannot be triggered.=C2=A0=C2=A0

If PUA is a /dev/null route this is not a FIB miss. It&#= 39;s a FIB hit.=C2=A0

Thx,
R.

On Wed, Nov 18, 20= 20 at 3:36 AM Huzhibo <huzhibo@hua= wei.com> wrote:

Hi Tony:

=C2=A0=C2=A0=C2=A0

In fa= ct, this protection use case protects the SRv6 mid-point. https://datatracker.ietf.org/doc/draft-chen-rtgwg-srv6-midpoint-protection/= . When the SRv6 mid-point fails, the PLR node can perform the next SID = operation, which is triggered by FIB miss. However, if there is a summary o= r default route in the area, FIB Miss cannot be triggered.

=C2=A0

Thank= s

=C2=A0

Zhibo=

=C2=A0=

From: Lsr [mailto:lsr-bounces@ietf.org] On Behalf Of to= ny.li@tony.li
Sent: Tuesday, November 17, 2020 2:31 PM
To: Aijun Wang <wangaijun@tsinghua.org.cn>
Cc: lsr <lsr@ie= tf.org>; Jeff Tantsura <jefftant.ietf@gmail.com>; Robert Raszuk <robert@raszuk.net>= ;; Acee Lindem (acee) <acee=3D40cisco.com@dmarc.ietf.org>
Subject: Re: [Lsr] Prefix Unreachable Announcement Use Cases<= u>

=C2=A0

=C2=A0

And how would that help connect= ivity restoration ?=C2=A0

[WAJ] This action wil= l trigger the path protection procedures, which will divert the traffic to = other backup path.=

=C2=A0

=C2=A0

This seems to be making some ma= jor assumptions about how path protection features operate. Those assumptio= ns need to be

very explicitly called out.<= /u>

=C2=A0

The path protection features th= at I=E2=80=99m familiar with are triggered by topological changes along the= existing operable path. A PUA

does not provide that.=C2=A0 Ra= ther, it=E2=80=99s something of a temporary signal saying =E2=80=99this bro= ke=E2=80=99. Without more specifics about the failure, it=E2=80=99s difficu= lt to=C2=A0

understand exactly what path pr= otection should make of this.=C2=A0 If a prefix is unreachable, the obvious= implication is that the associated link has

failed.=C2=A0 Path protection i= n a remote area is highly unlikely to have the topological details necessar= y to find an alternate path to that prefix.

=C2=A0

Tony

=C2=A0

--0000000000001a322905b45cb2cd-- From nobody Tue Nov 17 23:48:55 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 9CA883A0D03 for ; Tue, 17 Nov 2020 23:48:53 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.098 X-Spam-Level: X-Spam-Status: No, score=-2.098 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=raszuk.net Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 0vgxua15Dbc7 for ; Tue, 17 Nov 2020 23:48:51 -0800 (PST) Received: from mail-lj1-x22d.google.com (mail-lj1-x22d.google.com [IPv6:2a00:1450:4864:20::22d]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 225C73A0CE6 for ; Tue, 17 Nov 2020 23:48:50 -0800 (PST) Received: by mail-lj1-x22d.google.com with SMTP id 142so1256690ljj.10 for ; Tue, 17 Nov 2020 23:48:50 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=raszuk.net; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=SaYndQyjytfugbl+nvD+dS1KwymVmDk26rpqrayQfik=; b=XhFwdR/jt6Gpiq0PsUPJO8WDEmweK81gic/LNFJ6kG14R65X+FFXPkPL5pABNarw6d H7B07kupe4zyLB2/GUU1WtBvIrK+wcRWGK8YNV4ssZWFGWy0ct2Bx62IZXbj9LYb25SP OdkNqeZVOpkO3OpLKCatfCfe28mEqbcGHd35N3jFQNvOeHE1o5zg/e4MHmS64z7eGCRc TsaIUIOEBptLfSFXS+fggEKpgJPKHx6yzYxcp9dJGGZJ7W8ZnFxnreagziOlfofc8Rtq LTAT8xE9aJdEGLao/5wleo2+P0+hCtu3oF1d6gFT1C/SVtwMJ9t6sOHMfc7B4IsPp3lL 6SRw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=SaYndQyjytfugbl+nvD+dS1KwymVmDk26rpqrayQfik=; b=iXTt5Wst14fH2aOrYibCoad7/G6QgLKyz8tmxE/cHnlIPeWz9LEly04OH72JojvN98 8CTqnOMGTuRa+GN2LjC/F3GJgd1vaqqMY1WSCT0RmEi68/lfdizqEIRIhWnnSfV+Q+ry iZ9lmcJatibb3YHXB1QkZAeyv0RkUmOJRlOWm94jcUUgQwu0/OXvFNzBGpzflEPVd9bS d8VSYjLm8adiJuSJhua0l2XKep+n6jobgtkt1FLi+kghAAjpZ+qEoOnGYhgMKamxmDfJ LtH0xAVal5T54LktX69n+2cBC1Z4GmcQcFu2WegCvqoMw9w2cwJtKavfhoSmfuMfNoMJ w2fQ== X-Gm-Message-State: AOAM533YuKgoTCK0Wve/pa66DwvWy03166lg83lUS0R2vfWwZ70mVkIr ZfWQsWe5bnXSjT1wDLygGWc6TVlyRPRic+5SxvftjQ== X-Google-Smtp-Source: ABdhPJx2xH7YUyw9BTAFsM3VkSvbpj5sedWVpjKIHlTQBJ3g6iLpIsI4RTJIxt51B9WIdPLOwF3u2SZjrpwMEmDnbmQ= X-Received: by 2002:a2e:97cc:: with SMTP id m12mr3308041ljj.404.1605685729099; Tue, 17 Nov 2020 23:48:49 -0800 (PST) MIME-Version: 1.0 References: <016b01d6bca9$cf908c20$6eb1a460$@tsinghua.org.cn> <32DFCE3A-D41C-48CA-928A-37011D158AEF@cisco.com> In-Reply-To: From: Robert Raszuk Date: Wed, 18 Nov 2020 08:48:38 +0100 Message-ID: To: Jeff Tantsura Cc: Gyan Mishra , "Acee Lindem (acee)" , lsr , Aijun Wang , "Acee Lindem (acee)" Content-Type: multipart/alternative; boundary="00000000000081165b05b45cd7f3" Archived-At: Subject: Re: [Lsr] Prefix Unreachable Announcement Use Cases X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 18 Nov 2020 07:48:54 -0000 --00000000000081165b05b45cd7f3 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Jeff, Please notice that WAN is not an IX. While you can have full mesh of BFD sessions among all IXP participants each bombarding each over over TB fabric every 100 ms or so to map the same over global WAN is a different game. If nothing else RTT between IXP participants in healthy IX is around 1 ms while RTT between PEs distributed globally is often 100-200 ms. Just imagine 1000 PEs in 10 areas distributed all over the world. That means that in worst case scenario (say same mgmt VPN present on each PE) you will establish 1000*999 BFD sessions. Now for this to make sense timer needs to be 100 ms or so with 3x or 5x multiplier. Anything slower will defeat the purpose as BGP withdraw will be faster. Then we go into queuing issues. If BFD packets are queued at any interface meltdowns may occur which can be far worse in consequences then waiting for BGP service route removal. Such meltdowns often result in cascading effects to the applications itself. So this is not at all about autodiscovery with which address to setup the BFD session. It is much more about operational aspects of going that direction. With that I am supportive of this work even if we label it as experimental for some time. As each network is different what is optimal solution for one design and deployment may not be optimal for the other. Many thx, Robert On Wed, Nov 18, 2020 at 4:34 AM Jeff Tantsura wrote: > We have been discussing for quite some time and in different wg's (there= =E2=80=99s > IX with RS use case) BFD verification based on next-hop extraction, Rober= t > - you should know. (also built a well working prototype in previous life)= . > > Very simple logic: > > Upon route import (BGP update received and imported), extract next-hop, > walk BFD session table, if no match (no existing session) - establish > (S)BFD session (Discriminators distribution is a solved problem) to the > next-hop, associate fate of all routes received from it, keep timers > reasonable to prevent false positives. > > State is limited to PE=E2=80=99s importing each others routes (sharing a = service) > only > High degree of automation > No IGP pollution > > Cheers, > Jeff > On Nov 17, 2020, 6:43 AM -0800, Acee Lindem (acee) , > wrote: > > Speaking as WG member: > > > > I think it would be good to hone in on the BGP PE failure convergence use > case as suggested by Robert. It seems there is some interest here althoug= h > I=E2=80=99m not convinced the IGP is the right place to solve this proble= m. > > > > Thanks, > > Acee > > > > *From:* Lsr on behalf of Gyan Mishra < > hayabusagsm@gmail.com> > *Date:* Tuesday, November 17, 2020 at 4:02 AM > *To:* Robert Raszuk > *Cc:* lsr , Jeff Tantsura , Aijun > Wang , "Acee Lindem (acee)" 40cisco.com@dmarc.ietf.org> > *Subject:* Re: [Lsr] Prefix Unreachable Announcement Use Cases > > > > > > > > On Tue, Nov 17, 2020 at 3:36 AM Robert Raszuk wrote: > > > > > > Robert, I believe the original intention was related to having the dat= a > plane converge quickly when summarization is used and flip so traffic > converges from the Active ABR to the Backup ABR. > > > > I do not buy this use case. Flooding within the area is fast such that > both ABRs will get the same info. As mentioned before there is no practic= al > use of PUA for making any routing or fwd decision on which ABR to use. If > your ABRs are not connected with min redundancy this draft is a worst pat= ch > ever to work around such a design. > > > > Gyan> Agreed. The point of PUA in ABR use case is the ability to trac= k > the component prefixes and in case where component is down and traffic is > still forwarded to the ABR and dropped. The other more important use cas= e > is when links are down within the area and the area is partitioned and so > one ABR has all component prefixes however other ABR is missing half the > component prefixes. So since the ABR will by default advertise the summa= ry > as long as their is one component UP the summary is still advertised. So > this use case is severely impacting as now you have an ECMP path to the > other area for the summary via the two ABRs and you drop half your > traffic. So now with PUA the problem is fixed and the PUA is sent and no= w > traffic is only sent to the ABR that has the component prefixes. > > > > Please present us a picture indicating before and after ABRs behaviour. > > > > Gyan> will do > > > > However PUA can be used in the absence of area segmentation within a > single area when a link or node fails to converge the data plane quickly = by > sending PUA for the backup path so the active path. > > > > If there is no area segmentation then there is no summaries. So what are > we missing in the first place ? > > > > Gyan> Sorry I am stating that PUA feature can also be used intra area > where if a link or node goes down to improve data plane convergence. > > > > > > With the IGP tuned with BFD fast detection on ISIS or OSPF links and LFA = & > RLFA for MPLS or TI-LFA for SR local protection - with those tweaks the > convergence is well into sub second. So for Intra area convergence with > all the optimizations mentioned I am not sure how much faster the data > plane will converge with PUA. > > > > Even without any of the above listed chain of acronymous things will > generally work well intra-area without PUAs. > > > > Gyan> Agreed which is why I mentioned the BGP next hop self use case > if I could figure out how PUA could help there that would be a major > benefit of PUA. > > > > Thx, > R. > > > > > > -- > > <> > > *Gyan Mishra* > > *Network Solutions Architect * > > > > *M 301 502-1347 13101 Columbia Pike * Silver Spring, MD > > > > --00000000000081165b05b45cd7f3 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Jeff,

Please notice that WAN is not an = IX.=C2=A0

While you can have full mesh of BFD sess= ions among all IXP participants each bombarding each over over TB fabric ev= ery 100 ms or so to map the same over global WAN is a different game. If no= thing else RTT between IXP participants in healthy IX is around 1 ms while = RTT between PEs distributed globally is often 100-200 ms.=C2=A0
<= br>
Just imagine 1000 PEs in 10 areas distributed all over the wo= rld. That means that in worst case scenario (say same mgmt VPN present on e= ach PE) you will establish 1000*999 BFD sessions. Now for this to make sens= e timer needs to be 100 ms or so with 3x or 5x multiplier. Anything slower = will defeat the purpose as BGP withdraw will be faster.=C2=A0
Then we go into queuing issues. If BFD packets are queued at an= y interface meltdowns may occur which can be far worse in consequences then= waiting for BGP service route removal. Such meltdowns often result in casc= ading effects to the applications itself.=C2=A0

So= this is not at all about autodiscovery with which address to setup=C2=A0th= e BFD session. It is much more about operational aspects of going that dire= ction.=C2=A0

With that I am supportive of this wor= k even if we label it as experimental for some time. As each network is dif= ferent what is optimal solution for one design and deployment may not be op= timal for the other.=C2=A0

Many thx,
Rob= ert


On Wed, Nov 18, 2020 at 4:34 AM Jeff Tantsura <<= a href=3D"mailto:jefftant.ietf@gmail.com">jefftant.ietf@gmail.com> w= rote:
We have been discussing for quite some time and in differ= ent wg's (there=E2=80=99s IX with RS use case) BFD verification based o= n next-hop extraction, Robert - you should know. (also built a well working= prototype in previous life).=C2=A0

Very simple logic:

Upon route import (BGP update received and imported), extract next-hop, wal= k BFD session table, if no match (no existing session) - establish (S)BFD s= ession (Discriminators distribution is a solved problem) to the next-hop, a= ssociate fate of all routes received from it, keep timers reasonable to pre= vent false positives.

State is limited to PE=E2=80=99s importing each others routes (sharing a se= rvice) only
High degree of automation
No IGP pollution=C2=A0

Cheers,
Jeff
On Nov 17, 2020, 6:43 AM -0800, Acee Lind= em (acee) <acee@cisc= o.com>, wrote:

Speaking as WG member:

=C2=A0

I think it would be good to hone in on the BGP PE fa= ilure convergence use case as suggested by Robert. It seems there is some i= nterest here although I=E2=80=99m not convinced the IGP is the right place = to solve this problem.

=C2=A0

Thanks,

Acee

=C2=A0

From: Lsr <ls= r-bounces@ietf.org> on behalf of Gyan Mishra <hayabusagsm@gmail.com>
Date: Tuesday, November 17, 2020 at 4:02 AM
To: Robert Raszuk <robert@raszuk.net>
Cc: lsr <lsr@ie= tf.org>, Jeff Tantsura <jefftant.ietf@gmail.com>, Aijun Wang <wangaijun@tsinghua.= org.cn>, "Acee Lindem (acee)" <acee=3D40cisco.com@dmarc.ietf.org>
Subject: Re: [Lsr] Prefix Unreachable Announcement Use Cases<= /p>

=C2=A0

=C2=A0

=C2=A0

=C2=A0

=C2=A0

=C2=A0 =C2=A0Robert, I b= elieve the original intention was related to having the data plane converge= quickly when summarization is used and flip so traffic converges from the = Active ABR to the Backup ABR.=C2=A0

=C2=A0

I do not buy this use ca= se. Flooding within the area is fast such that both ABRs will get the same = info. As mentioned before there is no practical use of PUA for making any r= outing or fwd decision on which ABR to use. If your ABRs are not connected = with min redundancy this draft is a worst patch ever to work around such a = design.=C2=A0

=C2=A0

=C2=A0 =C2=A0Gyan> Ag= reed.=C2=A0 The point of PUA in ABR use case is the ability to track the co= mponent prefixes and in case where component is down and traffic is still f= orwarded to the ABR and dropped.=C2=A0 The other more important use case is= when links are down within the area and the area is partitioned and so one= ABR has all component prefixes however other ABR is missing half the compo= nent prefixes.=C2=A0 So since the ABR will by default advertise the summary= as long as their is one component UP the summary is still advertised.=C2= =A0 So this use case is severely impacting as now you have an ECMP path to = the other area for the summary via the two ABRs and you drop half your traf= fic.=C2=A0 So now with PUA the problem is fixed and the PUA is sent and now= traffic is only sent to the ABR that has the component prefixes.

=C2=A0

Please present us a pict= ure indicating before and after ABRs behaviour.=C2=A0

=C2=A0

=C2=A0 =C2=A0 =C2=A0Gyan= > will do=C2=A0

=C2=A0

=C2=A0 =C2=A0However PUA= can be used in the absence of area segmentation within a single area when = a link or node fails to converge the data plane quickly by sending PUA for = the backup path so the active path.=C2=A0

=C2=A0

If there is no area segm= entation then there is no summaries. So what are we missing in the first pl= ace ?=C2=A0

=C2=A0

=C2=A0 =C2=A0 Gyan> S= orry I am stating that PUA feature can also be used intra area where if a l= ink or node goes down to improve data plane convergence.

=C2=A0

=C2=A0

With the IGP tuned with = BFD fast detection on ISIS or OSPF links and LFA & RLFA for MPLS or TI-= LFA for SR local protection - with those tweaks the convergence is well int= o sub second.=C2=A0 So for Intra area convergence with all the optimization= s mentioned I am not sure how much faster the data plane will converge with= PUA.

=C2=A0

Even without any of the = above listed chain of acronymous things will generally work well intra-area= without PUAs.=C2=A0

=C2=A0

=C2=A0 =C2=A0 Gyan> A= greed which is why I mentioned the BGP next hop self use case if I could fi= gure out how PUA could help there that would be a major benefit of PUA.

=C2=A0

Thx,
R.

=C2=A0

=C2=A0

--

<>

Gyan Mishra

Network Solutions Architect= =C2=A0

M 301 502-1347
13101 Columbia Pike=C2=A0
 Silver= Spring, MD

=C2=A0

--00000000000081165b05b45cd7f3-- From nobody Wed Nov 18 00:06:28 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C9DCF3A102C for ; Wed, 18 Nov 2020 00:06:25 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.896 X-Spam-Level: X-Spam-Status: No, score=-1.896 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=unavailable autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id hRSb9WzG7-rA for ; Wed, 18 Nov 2020 00:06:21 -0800 (PST) Received: from mail-m127101.qiye.163.com (mail-m127101.qiye.163.com [115.236.127.101]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 4D62C3A15E4 for ; Wed, 18 Nov 2020 00:05:36 -0800 (PST) Received: from DESKTOP2IOH5QC (unknown [219.142.69.75]) by mail-m127101.qiye.163.com (Hmail) with ESMTPA id AE0A24627B; Wed, 18 Nov 2020 16:05:30 +0800 (CST) From: "Aijun Wang" To: "'Robert Raszuk'" , "'Jeff Tantsura'" Cc: "'Gyan Mishra'" , "'Acee Lindem \(acee\)'" , "'lsr'" , "'Acee Lindem \(acee\)'" References: <016b01d6bca9$cf908c20$6eb1a460$@tsinghua.org.cn> <32DFCE3A-D41C-48CA-928A-37011D158AEF@cisco.com> In-Reply-To: Date: Wed, 18 Nov 2020 16:05:30 +0800 Message-ID: <019901d6bd81$9565b5b0$c0312110$@tsinghua.org.cn> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_019A_01D6BDC4.A38ACA70" X-Mailer: Microsoft Outlook 16.0 Thread-Index: AQILbNEP0SRic90ZNEbpRjygmkrFZQJx5udEAhaZmkECROyKowKGLtmXAYkEwwQB6y6oOAGrbUjJAsuFR0kBjd7z5KjNwu/w Content-Language: zh-cn X-HM-Spam-Status: e1kfGhgUHx5ZQUtXWQgYFAkeWUFZS1VLWVdZKFlBSkxLS0o3V1ktWUFJV1 kPCRoVCBIfWUFZTUNOHR9DT00YShhKVkpNS05NQ01MSEpLSUpVEwETFhoSFyQUDg9ZV1kWGg8SFR 0UWUFZT0tIVUpKS09ISFVLWQY+ X-HM-Sender-Digest: e1kMHhlZQR0aFwgeV1kSHx4VD1lBWUc6ODY6DDo4KT8ZEQ9JTBIJMSw6 OhAaC0xVSlVKTUtOTUNNTEhKTkhJVTMWGhIXVQwaFRwaEhEOFTsPCBIVHBMOGlUUCRxVGBVFWVdZ EgtZQVlJSkJVSk9JVU1CVUxOWVdZCAFZQU9LSk9NNwY+ X-HM-Tid: 0a75da63209e9865kuuuae0a24627b Archived-At: Subject: Re: [Lsr] Prefix Unreachable Announcement Use Cases X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 18 Nov 2020 08:06:26 -0000 This is a multipart message in MIME format. ------=_NextPart_000_019A_01D6BDC4.A38ACA70 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Hi, Robert: =20 The trigger and propagation of PUA info can be standardized, the actions = based on the PUA can be different in different situation.=20 We can discuss and describe the actions based on different scenarios = after its WG adoption? =20 =20 Best Regards =20 Aijun Wang China Telecom =20 From: Robert Raszuk =20 Sent: Wednesday, November 18, 2020 3:49 PM To: Jeff Tantsura Cc: Gyan Mishra ; Acee Lindem (acee) = ; lsr ; Aijun Wang = ; Acee Lindem (acee) = Subject: Re: [Lsr] Prefix Unreachable Announcement Use Cases =20 Jeff, =20 Please notice that WAN is not an IX.=20 =20 While you can have full mesh of BFD sessions among all IXP participants = each bombarding each over over TB fabric every 100 ms or so to map the = same over global WAN is a different game. If nothing else RTT between = IXP participants in healthy IX is around 1 ms while RTT between PEs = distributed globally is often 100-200 ms.=20 =20 Just imagine 1000 PEs in 10 areas distributed all over the world. That = means that in worst case scenario (say same mgmt VPN present on each PE) = you will establish 1000*999 BFD sessions. Now for this to make sense = timer needs to be 100 ms or so with 3x or 5x multiplier. Anything slower = will defeat the purpose as BGP withdraw will be faster.=20 =20 Then we go into queuing issues. If BFD packets are queued at any = interface meltdowns may occur which can be far worse in consequences = then waiting for BGP service route removal. Such meltdowns often result = in cascading effects to the applications itself.=20 =20 So this is not at all about autodiscovery with which address to setup = the BFD session. It is much more about operational aspects of going that = direction.=20 =20 With that I am supportive of this work even if we label it as = experimental for some time. As each network is different what is optimal = solution for one design and deployment may not be optimal for the other. = =20 Many thx, Robert =20 =20 On Wed, Nov 18, 2020 at 4:34 AM Jeff Tantsura > wrote: We have been discussing for quite some time and in different wg's = (there=E2=80=99s IX with RS use case) BFD verification based on next-hop = extraction, Robert - you should know. (also built a well working = prototype in previous life).=20 Very simple logic: Upon route import (BGP update received and imported), extract next-hop, = walk BFD session table, if no match (no existing session) - establish = (S)BFD session (Discriminators distribution is a solved problem) to the = next-hop, associate fate of all routes received from it, keep timers = reasonable to prevent false positives. State is limited to PE=E2=80=99s importing each others routes (sharing a = service) only High degree of automation No IGP pollution=20 =20 Cheers,=20 Jeff On Nov 17, 2020, 6:43 AM -0800, Acee Lindem (acee) >, wrote: Speaking as WG member: =20 I think it would be good to hone in on the BGP PE failure convergence = use case as suggested by Robert. It seems there is some interest here = although I=E2=80=99m not convinced the IGP is the right place to solve = this problem. =20 Thanks, Acee =20 From: Lsr > on = behalf of Gyan Mishra > Date: Tuesday, November 17, 2020 at 4:02 AM To: Robert Raszuk > Cc: lsr >, Jeff Tantsura = >, Aijun Wang = >, "Acee = Lindem (acee)" > Subject: Re: [Lsr] Prefix Unreachable Announcement Use Cases =20 =20 =20 On Tue, Nov 17, 2020 at 3:36 AM Robert Raszuk > wrote: =20 =20 Robert, I believe the original intention was related to having the = data plane converge quickly when summarization is used and flip so = traffic converges from the Active ABR to the Backup ABR.=20 =20 I do not buy this use case. Flooding within the area is fast such that = both ABRs will get the same info. As mentioned before there is no = practical use of PUA for making any routing or fwd decision on which ABR = to use. If your ABRs are not connected with min redundancy this draft is = a worst patch ever to work around such a design.=20 =20 Gyan> Agreed. The point of PUA in ABR use case is the ability to = track the component prefixes and in case where component is down and = traffic is still forwarded to the ABR and dropped. The other more = important use case is when links are down within the area and the area = is partitioned and so one ABR has all component prefixes however other = ABR is missing half the component prefixes. So since the ABR will by = default advertise the summary as long as their is one component UP the = summary is still advertised. So this use case is severely impacting as = now you have an ECMP path to the other area for the summary via the two = ABRs and you drop half your traffic. So now with PUA the problem is = fixed and the PUA is sent and now traffic is only sent to the ABR that = has the component prefixes. =20 Please present us a picture indicating before and after ABRs behaviour.=20 =20 Gyan> will do=20 =20 However PUA can be used in the absence of area segmentation within a = single area when a link or node fails to converge the data plane quickly = by sending PUA for the backup path so the active path.=20 =20 If there is no area segmentation then there is no summaries. So what are = we missing in the first place ?=20 =20 Gyan> Sorry I am stating that PUA feature can also be used intra = area where if a link or node goes down to improve data plane = convergence. =20 =20 With the IGP tuned with BFD fast detection on ISIS or OSPF links and LFA = & RLFA for MPLS or TI-LFA for SR local protection - with those tweaks = the convergence is well into sub second. So for Intra area convergence = with all the optimizations mentioned I am not sure how much faster the = data plane will converge with PUA. =20 Even without any of the above listed chain of acronymous things will = generally work well intra-area without PUAs.=20 =20 Gyan> Agreed which is why I mentioned the BGP next hop self use case = if I could figure out how PUA could help there that would be a major = benefit of PUA. =20 Thx, R. =20 =20 -- <> Gyan Mishra Network Solutions Architect=20 M 301 502-1347 13101 Columbia Pike=20 Silver Spring, MD =20 ------=_NextPart_000_019A_01D6BDC4.A38ACA70 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable

H= i, Robert:

<= o:p> 

T= he trigger and propagation of PUA info can be standardized, the actions = based on the PUA can be different in different situation. =

W= e can discuss and describe the actions based on different scenarios = after its WG adoption?

<= o:p> 

<= o:p> 

B= est Regards

<= o:p> 

A= ijun Wang

C= hina Telecom<= o:p>

<= o:p> 

From:<= /b> Robert = Raszuk <robert@raszuk.net>
Sent: Wednesday, November = 18, 2020 3:49 PM
To: Jeff Tantsura = <jefftant.ietf@gmail.com>
Cc: Gyan Mishra = <hayabusagsm@gmail.com>; Acee Lindem (acee) = <acee@cisco.com>; lsr <lsr@ietf.org>; Aijun Wang = <wangaijun@tsinghua.org.cn>; Acee Lindem (acee) = <acee=3D40cisco.com@dmarc.ietf.org>
Subject: Re: [Lsr] = Prefix Unreachable Announcement Use Cases

 

Jeff,

 

Please notice that WAN is not an = IX. 

 

While you can have full mesh of BFD sessions among all IXP = participants each bombarding each over over TB fabric every 100 ms or so = to map the same over global WAN is a different game. If nothing else RTT = between IXP participants in healthy IX is around 1 ms while RTT between = PEs distributed globally is often 100-200 = ms. 

 

Just imagine 1000 PEs in 10 areas distributed all over the = world. That means that in worst case scenario (say same mgmt VPN present = on each PE) you will establish 1000*999 BFD sessions. Now for this to = make sense timer needs to be 100 ms or so with 3x or 5x multiplier. = Anything slower will defeat the purpose as BGP withdraw will be = faster. 

 

Then we go into queuing issues. If BFD packets are queued = at any interface meltdowns may occur which can be far worse in = consequences then waiting for BGP service route removal. Such meltdowns = often result in cascading effects to the applications = itself. 

 

So this is not at all about autodiscovery with which = address to setup the BFD session. It is much more about operational = aspects of going that = direction. 

 

With that I am supportive of this work even if we label it = as experimental for some time. As each network is different what is = optimal solution for one design and deployment may not be optimal for = the other. 

 

Many thx,

Robert

 

 

On Wed, Nov 18, 2020 at 4:34 AM Jeff Tantsura <jefftant.ietf@gmail.com> = wrote:

We have been discussing for quite some time and in = different wg's (there=E2=80=99s IX with RS use case) BFD verification = based on next-hop extraction, Robert - you should know. (also built a = well working prototype in previous life). 

Very simple = logic:

Upon route import (BGP update received and imported), = extract next-hop, walk BFD session table, if no match (no existing = session) - establish (S)BFD session (Discriminators distribution is a = solved problem) to the next-hop, associate fate of all routes received = from it, keep timers reasonable to prevent false positives.

State = is limited to PE=E2=80=99s importing each others routes (sharing a = service) only
High degree of automation
No IGP = pollution 

 

Cheers,

Jeff

On Nov 17, 2020, 6:43 AM -0800, Acee Lindem (acee) <acee@cisco.com>, = wrote:

Speaking as WG = member:

 

I think it would be good to hone in on = the BGP PE failure convergence use case as suggested by Robert. It seems = there is some interest here although I=E2=80=99m not convinced the IGP = is the right place to solve this problem.

 

Thanks,

Acee

 

From: Lsr <lsr-bounces@ietf.org> on behalf of Gyan Mishra = <hayabusagsm@gmail.com>
Date: Tuesday, = November 17, 2020 at 4:02 AM
To: Robert Raszuk <robert@raszuk.net>
Cc: lsr <lsr@ietf.org>, = Jeff Tantsura <jefftant.ietf@gmail.com>, Aijun Wang <wangaijun@tsinghua.org.cn>, "Acee Lindem = (acee)" <acee=3D40cisco.com@dmarc.ietf.org>
Subject: = Re: [Lsr] Prefix Unreachable Announcement Use = Cases

 

 

 

On Tue, Nov 17, 2020 at 3:36 AM Robert = Raszuk <robert@raszuk.net> = wrote:

 

 

   Robert, I believe the = original intention was related to having the data plane converge quickly = when summarization is used and flip so traffic converges from the Active = ABR to the Backup = ABR. 

 

I do not buy this use case. Flooding = within the area is fast such that both ABRs will get the same info. As = mentioned before there is no practical use of PUA for making any routing = or fwd decision on which ABR to use. If your ABRs are not connected with = min redundancy this draft is a worst patch ever to work around such a = design. 

 

   Gyan> Agreed.  The = point of PUA in ABR use case is the ability to track the component = prefixes and in case where component is down and traffic is still = forwarded to the ABR and dropped.  The other more important use = case is when links are down within the area and the area is partitioned = and so one ABR has all component prefixes however other ABR is missing = half the component prefixes.  So since the ABR will by default = advertise the summary as long as their is one component UP the summary = is still advertised.  So this use case is severely impacting as now = you have an ECMP path to the other area for the summary via the two ABRs = and you drop half your traffic.  So now with PUA the problem is = fixed and the PUA is sent and now traffic is only sent to the ABR that = has the component prefixes.

 

Please present us a picture indicating = before and after ABRs = behaviour. 

 

     Gyan> will = do 

 

   However PUA can be used in = the absence of area segmentation within a single area when a link or = node fails to converge the data plane quickly by sending PUA for the = backup path so the active = path. 

 

If there is no area segmentation then = there is no summaries. So what are we missing in the first place = ? 

 

    Gyan> Sorry I am = stating that PUA feature can also be used intra area where if a link or = node goes down to improve data plane = convergence.

 

 

With the IGP tuned with BFD fast = detection on ISIS or OSPF links and LFA & RLFA for MPLS or TI-LFA = for SR local protection - with those tweaks the convergence is well into = sub second.  So for Intra area convergence with all the = optimizations mentioned I am not sure how much faster the data plane = will converge with = PUA.

 

Even without any of the above listed = chain of acronymous things will generally work well intra-area without = PUAs. 

 

    Gyan> Agreed which is = why I mentioned the BGP next hop self use case if I could figure out how = PUA could help there that would be a major benefit of = PUA.

 

Thx,
R.

 

 

<= /div>

--

<= div>

<>

Gyan = Mishra

Network Solutions = Architect 

M 301 = 502-1347
13101 Columbia Pike 
Silver Spring, MD

 

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Message-ID: <160572176355.14191.14028082111926027835@ietfa.amsl.com> Date: Wed, 18 Nov 2020 09:49:23 -0800 Archived-At: Subject: [Lsr] I-D Action: draft-ietf-lsr-isis-area-proxy-05.txt X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 18 Nov 2020 17:49:24 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Link State Routing WG of the IETF. Title : Area Proxy for IS-IS Authors : Tony Li Sarah Chen Vivek Ilangovan Gyan S. Mishra Filename : draft-ietf-lsr-isis-area-proxy-05.txt Pages : 20 Date : 2020-11-18 Abstract: Link state routing protocols have hierarchical abstraction already built into them. However, when lower levels are used for transit, they must expose their internal topologies to each other, leading to scale issues. To avoid this, this document discusses extensions to the IS-IS routing protocol that would allow level 1 areas to provide transit, yet only inject an abstraction of the level 1 topology into level 2. Each level 1 area is represented as a single level 2 node, thereby enabling greater scale. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-area-proxy/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-lsr-isis-area-proxy-05 https://datatracker.ietf.org/doc/html/draft-ietf-lsr-isis-area-proxy-05 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-lsr-isis-area-proxy-05 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. 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autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id AiA3mM2lfFkv for ; Wed, 18 Nov 2020 18:27:43 -0800 (PST) Received: from mail-m127101.qiye.163.com (mail-m127101.qiye.163.com [115.236.127.101]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 643863A0992 for ; Wed, 18 Nov 2020 18:27:41 -0800 (PST) Received: from DESKTOP2IOH5QC (unknown [219.142.69.75]) by mail-m127101.qiye.163.com (Hmail) with ESMTPA id CB4CB46F08; Thu, 19 Nov 2020 10:27:37 +0800 (CST) From: "Aijun Wang" To: "'Yingzhen Qu'" , "'Acee Lindem \(acee\)'" Cc: "'lsr'" References: <160539745568.19790.10758399794139845841@ietfa.amsl.com> <016a01d6bca7$f8753700$e95fa500$@chinatelecom.cn> <00fa01d6bd52$3daacce0$b90066a0$@tsinghua.org.cn> <2DF4A6D0-E410-4652-977C-258A0D2950D5@cisco.com> <018101d6bd79$41038310$c30a8930$@tsinghua.org.cn> In-Reply-To: Date: Thu, 19 Nov 2020 10:27:37 +0800 Message-ID: <00ca01d6be1b$8c34bff0$a49e3fd0$@tsinghua.org.cn> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00CB_01D6BE5E.9A5B8260" X-Mailer: Microsoft Outlook 16.0 Thread-Index: AQIF418f17swSsDbQCwbOqY53zNVtACzAfTgAZb9mxoCBhw1SQJ4FQG3APUREyoCSnAUrqkgImTg Content-Language: zh-cn X-HM-Spam-Status: e1kfGhgUHx5ZQUtXWQgYFAkeWUFZS1VLWVdZKFlBSkxLS0o3V1ktWUFJV1 kPCRoVCBIfWUFZT0seGRhOTEIZGEtPVkpNS05MTklDTkNKS09VEwETFhoSFyQUDg9ZV1kWGg8SFR 0UWUFZT0tIVUpKS0hKTFVLWQY+ X-HM-Sender-Digest: e1kMHhlZQR0aFwgeV1kSHx4VD1lBWUc6NTI6Dio5Aj8dAQ4zTwo*MQtK LUMKCS1VSlVKTUtOTE5JQ05DTUJIVTMWGhIXVQwaFRwaEhEOFTsPCBIVHBMOGlUUCRxVGBVFWVdZ EgtZQVlJSkJVSk9JVU1CVUxOWVdZCAFZQUxKQkpLNwY+ X-HM-Tid: 0a75de54254a9865kuuucb4cb46f08 Archived-At: Subject: Re: [Lsr] New Version Notification for draft-wang-lsr-passive-interface-attribute-06.txt X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 19 Nov 2020 02:27:46 -0000 This is a multipart message in MIME format. ------=_NextPart_000_00CB_01D6BE5E.9A5B8260 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Hi, Yingzhen: =20 Please see whether the replies below inline can solve your concerns or = not. =20 Best Regards =20 Aijun Wang China Telecom =20 From: lsr-bounces@ietf.org On Behalf Of Yingzhen = Qu Sent: Wednesday, November 18, 2020 8:57 PM To: Aijun Wang ; 'Acee Lindem (acee)' = Cc: 'lsr' Subject: Re: [Lsr] New Version Notification for = draft-wang-lsr-passive-interface-attribute-06.txt =20 Hi Aijun, =20 [WAJ] In your 109 meeting presentation = slides-109-lsr-5-ospf-transport-instance-00 = , you mentioned also the = similar information that should be transferred via the OSPF protocol. I = think this is the direction and we can prepare for it in advance. = Putting such non-routing information in one independent TLV can = certainly keep the stability of IGP protocol.=20 =20 Just to respond this comment here. The purpose of OSPF transport = instance is to carry non-routing information for applications without = impacting routing calculation and convergence. When you say = =E2=80=9Cthis is the direction=E2=80=9D, do you mean using OSPF = transport instance to carry application data or to use base OSPF = instance?=20 [WAJ] use base OSPF instance is better. I think the reason to advertise = the server info via IGP protocol is to let the router select the right = path to server.=20 =20 Also how putting such non-routing information in one independent TLV can = keep the stability of IGP protocol? [WAJ] The router can easily recognize such info when it do SPF = calculation, skip some steps(for example, topology calculation) then. And, considering the interface that connects the server to the router is = always passive, would you like to put these info into Stub-Link TLV that = defined in the passive interface draft? =20 Depending on the application, this kind of information may need to be = updated very often, for example CPU usage, and this will certainly have = some impacts. Especially when there more applications and each of them = needs to be updated at different intervals and frequencies. [WAJ] They should all meet the minimum threshold, as also mentioned in = Acee=E2=80=99s presentation file. =20 Thanks, Yingzhen =20 From: Lsr > on = behalf of Aijun Wang > Date: Tuesday, November 17, 2020 at 11:06 PM To: "'Acee Lindem (acee)'" > Cc: 'lsr' > Subject: Re: [Lsr] New Version Notification for = draft-wang-lsr-passive-interface-attribute-06.txt Resent-From: > Resent-Date: Tuesday, November 17, 2020 at 11:06 PM =20 Hi, Acee: =20 From: Acee Lindem (acee) >=20 Sent: Wednesday, November 18, 2020 12:39 PM To: Aijun Wang > Cc: 'lsr' > Subject: Re: [Lsr] New Version Notification for = draft-wang-lsr-passive-interface-attribute-06.txt =20 From: Aijun Wang > Date: Tuesday, November 17, 2020 at 9:27 PM To: Acee Lindem > Cc: 'lsr' > Subject: RE: [Lsr] New Version Notification for = draft-wang-lsr-passive-interface-attribute-06.txt =20 Hi, Acee: =20 -----Original Message----- From: lsr-bounces@ietf.org = > On Behalf Of Acee = Lindem (acee) Sent: Wednesday, November 18, 2020 2:47 AM To: Aijun Wang = > Cc: 'lsr' > Subject: Re: [Lsr] New Version Notification for = draft-wang-lsr-passive-interface-attribute-06.txt =20 Speaking as WG member and longtime steward of the IGPs: =20 Hi Aijun,=20 =20 My opinion is that we should not overload the base IGP topology = advertisements with everyone's favorite obscure use case. Hence, I think = it would be a big mistake to add this stub link TLV to the base LSAs.=20 [WAJ] Putting the information in other regular TLVs, or putting them in = LSA of one independent IGP instance(as you proposed in 109 meeting) will = be more expensive. Do you agree this statement? =20 No =E2=80=93 bloating the primary LSAs with non-routing information will = be more expensive due to the dynamics of LSA origination and route = computation.=20 [WAJ] what=E2=80=99s your recommendation then? The router can skip such = information when they do SPF calculation, just need only add the = information to the attached leaf router when the computation is = completed. The LSA update is periodic and event driven. Advertising such = information in a controlled manner does not deteriorate the flooding = status.=20 =20 Rather, exactly what problem are you trying to solve? Previously, you = were trying to associate the passive interface attribute with a prefix = and making some inference related to an inter-AS boundary (this was not = entirely clear). What problem are you trying to solve? Precisely, what = do you want the controller to learn (i.e., address or interface index) = and what is it going to do with it. [WAJ] Passive Interfaces are already deployed within the network in many = places, as stated in the = draft-wang-lsr-passive-interface-attribute-06#section-1 = . What we want to know, is the = position of passive interface. Previously, we want piggyback such = information within its associated prefix, but after discussion on the = mail list, define one new TLV to contain it and other future information = may be more acceptable and extensible. =20 And how do identify and even define the position of the passive = interface?=20 [WAJ] Passive interface be certainly attached the router that advertises = the associated stub-link TLV. =20 =20 As I stated previously, passive interfaces are not standardized.=20 [WAJ] if you mentioned just the term, we can change it later. Or if so, = what=E2=80=99s other term do you recommend then? =20 Knowing these information, the controller can learn the inter-as links = via some methods that we have discussed in another thread, can know the = boundary of network, can learn the link characteristic that associated = with server etc. We have also mentioned it in the = draft-wang-lsr-passive-interface-attribute-06#section-1 = and think it is not appropriate = to expand it intensely in one LSR draft. =20 I disagree. Precisely define your use case.=20 [WAJ] which part of the introduction section is not clear enough? There = are about 3 possible use cases of such information, aren=E2=80=99t they = enough? And, we have described one use case in detail in previous version of = this draft draft-wang-lsr-passive-interface-attribute-04#section-3 = . If necessary, we can add it back again in = the next version. This is just one use case, you can also refer to = draft-dunbar-lsr-5g-edge-compute-ospf-ext-01 = for the detail of another use case. =20 =20 =20 =20 Please don't try and solve the CFN problem as the requirements are not = clear (anycast, unicast, impact on routing, scope, etc).=20 [WAJ] In your 109 meeting presentation = slides-109-lsr-5-ospf-transport-instance-00 = , you mentioned also the = similar information that should be transferred via the OSPF protocol. I = think this is the direction and we can prepare for it in advance. = Putting such non-routing information in one independent TLV can = certainly keep the stability of IGP protocol.=20 =20 This was just an example of something that could be offloaded to a = separate instance in the slides. It is not a specification.=20 =20 Thanks, Acee =20 =20 =20 Thanks, Acee =20 On 11/17/20, 1:08 AM, " = = wangaj3@chinatelecom.cn on behalf of Aijun Wang" < = wangaj3@chinatelecom.cn> wrote: =20 Hi, Acee: =20 As discussed on the list and during the 109 meeting, we have updated = the draft to reflect the comments from the LSR community. Please see whether you have still other concerns or not and if there = is no further comments on this direction, can we begin the WG adoption = call then? Thanks you and Peter for your intense discussions for this draft. =20 Thanks in advance. =20 Best Regards =20 Aijun Wang China Telecom =20 > -----Original Message----- > From: internet-drafts@ietf.org = < internet-drafts@ietf.org> > Sent: Sunday, November 15, 2020 7:44 AM > To: Zhibo Hu < huzhibo@huawei.com>; = Aijun Wang > < wangaj3@chinatelecom.cn>; Gyan = S. Mishra < = gyan.s.mishra@verizon.com>; > Gyan Mishra < = gyan.s.mishra@verizon.com> > Subject: New Version Notification for > draft-wang-lsr-passive-interface-attribute-06.txt >=20 >=20 > A new version of I-D, = draft-wang-lsr-passive-interface-attribute-06.txt > has been successfully submitted by Aijun Wang and posted to the = IETF > repository. >=20 > Name: draft-wang-lsr-passive-interface-attribute > Revision: 06 > Title: Passive Interface Attribute > Document date: 2020-11-15 > Group: Individual Submission > Pages: 10 > URL: > = = https://www.ietf.org/archive/id/draft-wang-lsr-passive-interface-attribut= e-06.t > xt > Status: > = = https://datatracker.ietf.org/doc/draft-wang-lsr-passive-interface-attribu= te/ > Htmlized: > = = https://datatracker.ietf.org/doc/html/draft-wang-lsr-passive-interface-at= tribut > e > Htmlized: > = = https://tools.ietf.org/html/draft-wang-lsr-passive-interface-attribute-06= > Diff: > = = https://www.ietf.org/rfcdiff?url2=3Ddraft-wang-lsr-passive-interface-attr= ibute-06 >=20 > Abstract: > This document describes the mechanism that can be used to > differentiate the passive interfaces from the normal interfaces > within ISIS or OSPF domain. >=20 >=20 >=20 >=20 > Please note that it may take a couple of minutes from the time of = submission > until the htmlized version and diff are available at = tools.ietf.org. >=20 > The IETF Secretariat >=20 =20 =20 =20 _______________________________________________ Lsr mailing list Lsr@ietf.org = = https://www.ietf.org/mailman/listinfo/lsr ------=_NextPart_000_00CB_01D6BE5E.9A5B8260 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable

Hi, = Yingzhen:

 

Please see = whether the replies below inline can solve your concerns or = not.

 

Best = Regards

 

Aijun = Wang

China Telecom

 

<= b>From:<= /b> = lsr-bounces@ietf.org <lsr-bounces@ietf.org> On Behalf Of = Yingzhen Qu
Sent: Wednesday, November 18, 2020 8:57 = PM
To: Aijun Wang <wangaijun@tsinghua.org.cn>; 'Acee = Lindem (acee)' <acee@cisco.com>
Cc: 'lsr' = <lsr@ietf.org>
Subject: Re: [Lsr] New Version = Notification for = draft-wang-lsr-passive-interface-attribute-06.txt

<= span lang=3DEN-US> 

Hi = Aijun,

 

[WAJ] In your 109 = meeting presentation slides-109-ls= r-5-ospf-transport-instance-00, you mentioned also the similar = information that should be transferred via the OSPF protocol. I think = this is the direction and we can prepare for it in advance. Putting such = non-routing information in one independent TLV can certainly keep the = stability of IGP protocol.

 

Just to = respond this comment here. The purpose of OSPF transport instance is to = carry non-routing information for applications without impacting routing = calculation and convergence. When you say =E2=80=9Cthis is the = direction=E2=80=9D, do you mean using OSPF transport instance to carry = application data or to use base OSPF instance?

[WAJ] use base OSPF instance is better. I think = the reason to advertise the server info via IGP protocol is to let the = router select the right path to server.

 

Also how = putting such non-routing information in one independent TLV can keep the = stability of IGP protocol?

[WAJ] The router can easily recognize such info = when it do SPF calculation, skip some steps(for example, topology = calculation) then.

And, considering the interface that connects the = server to the router is always passive, would you like to put these info = into Stub-Link TLV that defined in the passive interface = draft?

 

Depending = on the application, this kind of information may need to be updated very = often, for example CPU usage, and this will certainly have some impacts. = Especially when there more applications and each of them needs to be = updated at different intervals and frequencies.

[WAJ] They should all meet the minimum = threshold, as also mentioned in Acee=E2=80=99s presentation = file.

 

Thanks,<= /o:p>

Yingzhen=

 

From: = Lsr = <lsr-bounces@ietf.org> = on behalf of Aijun Wang <wangaijun@tsinghua.org.cn&g= t;
Date: Tuesday, November 17, 2020 at 11:06 PM
To: = "'Acee Lindem (acee)'" <acee@cisco.com>
Cc: = 'lsr' <lsr@ietf.org>
Subject: Re: = [Lsr] New Version Notification for = draft-wang-lsr-passive-interface-attribute-06.txt
Resent-From: = <yingzhen.qu@huawei.com>
= Resent-Date: Tuesday, November 17, 2020 at 11:06 = PM

 

Hi, Acee:

 

<= b>From:<= /b> Acee Lindem = (acee) <acee@cisco.com> =
Sent: Wednesday, November 18, 2020 12:39 PM
To: = Aijun Wang <wangaijun@tsinghua.org.cn&g= t;
Cc: 'lsr' <lsr@ietf.org>
Subject: Re: = [Lsr] New Version Notification for = draft-wang-lsr-passive-interface-attribute-06.txt

 =

From: = Aijun Wang <wangaijun@tsinghua.org.cn&g= t;
Date: Tuesday, November 17, 2020 at 9:27 PM
To: = Acee Lindem <acee@cisco.com>
Cc: = 'lsr' <lsr@ietf.org>
Subject: RE: = [Lsr] New Version Notification for = draft-wang-lsr-passive-interface-attribute-06.txt

 

Hi, = Acee:

 

-----Original = Message-----
From: lsr-bounces@ietf.org <lsr-bounces@ietf.org> On = Behalf Of Acee Lindem (acee)
Sent: Wednesday, November 18, 2020 2:47 = AM
To: Aijun Wang <wangaj3@chinatelecom.cn>Cc: 'lsr' <lsr@ietf.org>
Subject: Re: [Lsr] = New Version Notification for = draft-wang-lsr-passive-interface-attribute-06.txt

 

Speaking as WG = member and longtime steward  of the IGPs:

 

Hi Aijun, =

 

My opinion is = that we should not overload the base IGP topology advertisements with = everyone's favorite obscure use case. Hence, I think it would be a big = mistake to add this stub link TLV to the base LSAs. =

[WAJ] Putting the = information in other regular TLVs, or putting them in LSA of one = independent IGP instance(as you proposed in 109 meeting) will be more = expensive. Do you agree this statement?

 =

No =E2=80=93 = bloating the primary LSAs with non-routing information will be more = expensive due to the dynamics of LSA origination and route computation. =

[WAJ] what=E2=80=99s your = recommendation then? The router can skip such information when they do = SPF calculation, just need only add the information to the attached leaf = router when the computation is completed. The LSA update is periodic and = event driven. Advertising such information in a controlled manner does = not deteriorate the flooding status.

 

Rather, exactly = what problem are you trying to solve? Previously, you were trying to = associate the passive interface attribute with a prefix and making some = inference related to an inter-AS boundary (this was not entirely clear). = What problem are you trying to solve? Precisely, what do you want the = controller to learn (i.e., address or interface index) and what is it = going to do with it.

[WAJ] Passive = Interfaces are already deployed within the network in many places, as = stated in the draft-wang-lsr= -passive-interface-attribute-06#section-1. What we want to = know, is the position of passive interface. Previously, we want = piggyback such information within its associated prefix, but after = discussion on the mail list, define one new TLV to contain it and other = future information may be more acceptable and = extensible.

 =

And how do = identify and even define the position of the passive interface? =

[WAJ] Passive interface be = certainly attached the router that advertises the associated stub-link = TLV. 

 

As I stated = previously, passive interfaces are not standardized.

[WAJ] if you mentioned just the = term, we can change it later. Or if so, what=E2=80=99s other term do you = recommend then?

 =

Knowing these = information, the controller can learn the inter-as links via some = methods that we have discussed in another thread, can know the boundary = of network, can learn the link characteristic that associated with = server etc. We have also mentioned it in the draft-wang-lsr= -passive-interface-attribute-06#section-1 and think it is not = appropriate to expand it intensely in one LSR draft.

 =

I disagree. = Precisely define your use case.

[WAJ] which part of the = introduction section is not clear enough? There are about 3 possible use = cases of such information, aren=E2=80=99t they = enough?

And, we have described one use case = in detail in previous version of this draft draft-wang-lsr-passive-inter= face-attribute-04#section-3. If necessary, we can add it back again = in the next version. This is just one use case, you can also refer to draft-dunbar-lsr-5g-edge-compute-ospf-e= xt-01 for the detail of another use case. 

 

 

 

Please don't try = and solve the CFN problem as the requirements are not clear (anycast, = unicast, impact on routing, scope, etc).

[WAJ] In your 109 = meeting presentation slides-109-ls= r-5-ospf-transport-instance-00, you mentioned also the similar = information that should be transferred via the OSPF protocol. I think = this is the direction and we can prepare for it in advance. Putting such = non-routing information in one independent TLV can certainly keep the = stability of IGP protocol.

 =

This was = just an example of something that could be offloaded to a separate = instance in the slides. It is not a specification.

 =

Thanks,

Acee

 <= /b>

 

 

Thanks,

<= p class=3DMsoPlainText = style=3D'margin-left:78.0pt;mso-para-margin-left:7.43gd'>Acee

 

On 11/17/20, = 1:08 AM, "wangaj3@chinatelecom.cn = on behalf of Aijun Wang" <wangaj3@chinatelecom.cn> wrote:

 

    Hi, = Acee:

 

    As = discussed on the list and during the 109 meeting, we have updated the = draft to reflect the comments from the LSR = community.

    Please see = whether you have still other concerns or not and if there is no further = comments on this direction, can we begin the WG adoption call = then?

    Thanks you = and Peter for your intense discussions for this = draft.

 

    Thanks in = advance.

 

    Best = Regards

 

    Aijun = Wang

    China = Telecom

 

    > = -----Original Message-----

    > From: = internet-drafts@ietf.org<= /span> <internet-drafts@ietf.org<= /span>>

    > Sent: = Sunday, November 15, 2020 7:44 AM

    > To: = Zhibo Hu <huzhibo@huawei.com= >; Aijun Wang

    > = <wangaj3@chinatelecom.cn>; Gyan S. Mishra <gyan.s.mishra@verizon.com= >;

    > Gyan = Mishra <gyan.s.mishra@verizon.com= >

    > = Subject: New Version Notification for

    > = draft-wang-lsr-passive-interface-attribute-06.txt

    > =

    > =

    > = A new version of I-D, = draft-wang-lsr-passive-interface-attribute-06.txt

    > has = been successfully submitted by Aijun Wang and posted to the = IETF

    > = repository.

    > =

    > = Name:           = draft-wang-lsr-passive-interface-attribute

    > = Revision:       06

    > = Title:           &= nbsp;  Passive Interface Attribute

    > = Document date:   2020-11-15

    > = Group:          Individual = Submission

    > = Pages:           = 10

    > = URL:

    > https://www.ietf.org/arch= ive/id/draft-wang-lsr-passive-interface-attribute-06.t

    > = xt

    > = Status:

    > https://datatracker.ietf.= org/doc/draft-wang-lsr-passive-interface-attribute/=

    > = Htmlized:

    > https://datatracker.ietf.= org/doc/html/draft-wang-lsr-passive-interface-attribut

    > = e

    > = Htmlized:

    > https://tools.ietf.org/ht= ml/draft-wang-lsr-passive-interface-attribute-06

    > = Diff:

    > https://www.ietf.org/rfcd= iff?url2=3Ddraft-wang-lsr-passive-interface-attribute-06<= /o:p>

    > =

    > = Abstract:

    = >    This document describes the mechanism that can be = used to

    = >    differentiate the passive interfaces from the = normal interfaces

    = >    within ISIS or OSPF = domain.

    > =

    > =

    > =

    > =

    > = Please note that it may take a couple of minutes from the time of = submission

    > until = the htmlized version and diff are available at = tools.ietf.org.

    > =

    > = The IETF Secretariat

    > =

 

 

 

______________________________= _________________

Lsr mailing = list

Lsr@ietf.org

https://www.ietf.org/mail= man/listinfo/lsr

------=_NextPart_000_00CB_01D6BE5E.9A5B8260-- From nobody Wed Nov 18 18:37:45 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 9E3053A0A08 for ; Wed, 18 Nov 2020 18:37:44 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.896 X-Spam-Level: X-Spam-Status: No, score=-1.896 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id i_BOZgu5UpU8 for ; Wed, 18 Nov 2020 18:37:42 -0800 (PST) Received: from mail-m127101.qiye.163.com (mail-m127101.qiye.163.com [115.236.127.101]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 520463A0A0B for ; Wed, 18 Nov 2020 18:37:40 -0800 (PST) Received: from DESKTOP2IOH5QC (unknown [219.142.69.75]) by mail-m127101.qiye.163.com (Hmail) with ESMTPA id 0B6B3466F1; Thu, 19 Nov 2020 10:37:38 +0800 (CST) From: "Aijun Wang" To: "'Acee Lindem \(acee\)'" , "'Robert Raszuk'" , "'Jeff Tantsura'" Cc: "'Gyan Mishra'" , "'lsr'" , "'Acee Lindem \(acee\)'" References: <016b01d6bca9$cf908c20$6eb1a460$@tsinghua.org.cn> <32DFCE3A-D41C-48CA-928A-37011D158AEF@cisco.com> <019901d6bd81$9565b5b0$c0312110$@tsinghua.org.cn> <2C21FE6C-4AC0-4949-ADE0-357DD7E18A87@cisco.com> In-Reply-To: <2C21FE6C-4AC0-4949-ADE0-357DD7E18A87@cisco.com> Date: Thu, 19 Nov 2020 10:37:37 +0800 Message-ID: <00d401d6be1c$f2027f60$d6077e20$@tsinghua.org.cn> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00D5_01D6BE60.002A5340" X-Mailer: Microsoft Outlook 16.0 Thread-Index: AQILbNEP0SRic90ZNEbpRjygmkrFZQJx5udEAhaZmkECROyKowKGLtmXAYkEwwQB6y6oOAGrbUjJAsuFR0kBjd7z5AKvqGZrAqi1YS6opDXEsA== Content-Language: zh-cn X-HM-Spam-Status: e1kfGhgUHx5ZQUtXWQgYFAkeWUFZS1VLWVdZKFlBSkxLS0o3V1ktWUFJV1 kPCRoVCBIfWUFZHh1KT01MQ0NJTk4eVkpNS05MTkhPTkNIQ0pVEwETFhoSFyQUDg9ZV1kWGg8SFR 0UWUFZT0tIVUpKS09ISFVLWQY+ X-HM-Sender-Digest: e1kMHhlZQR0aFwgeV1kSHx4VD1lBWUc6NDo6Lhw6GD8sNw5KMAswMBNR TB8aCQtVSlVKTUtOTE5IT05DQktDVTMWGhIXVQwaFRwaEhEOFTsPCBIVHBMOGlUUCRxVGBVFWVdZ EgtZQVlJSkJVSk9JVU1CVUxOWVdZCAFZQU5LS0JDNwY+ X-HM-Tid: 0a75de5d4e4a9865kuuu0b6b3466f1 Archived-At: Subject: Re: [Lsr] Prefix Unreachable Announcement Use Cases X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 19 Nov 2020 02:37:45 -0000 This is a multipart message in MIME format. ------=_NextPart_000_00D5_01D6BE60.002A5340 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Hi, Acee: =20 OK, we will try to improve this document to meet this criteria.=20 And, as this topic has been discussed intensely on the mail list, we are = also eager to invite more interested experts to join us as co-authors to = refine the solutions for more scenarios. =20 Thanks in advance. =20 Best Regards =20 Aijun Wang China Telecom =20 =20 From: Acee Lindem (acee) =20 Sent: Thursday, November 19, 2020 12:42 AM To: Aijun Wang ; 'Robert Raszuk' = ; 'Jeff Tantsura' Cc: 'Gyan Mishra' ; 'lsr' ; 'Acee = Lindem (acee)' Subject: Re: [Lsr] Prefix Unreachable Announcement Use Cases =20 Speaking as WG Co-Chair: =20 From: Aijun Wang > Date: Wednesday, November 18, 2020 at 3:05 AM To: Robert Raszuk >, Jeff = Tantsura > Cc: 'Gyan Mishra' = >, Acee Lindem >, 'lsr' = >, "'Acee Lindem (acee)'" = > Subject: RE: [Lsr] Prefix Unreachable Announcement Use Cases =20 Hi, Robert: =20 The trigger and propagation of PUA info can be standardized, the actions = based on the PUA can be different in different situation.=20 We can discuss and describe the actions based on different scenarios = after its WG adoption? =20 There will be no adoption call until there is a coherent draft with use = case(s) and viable actions.=20 =20 Thanks, Acee =20 =20 Best Regards =20 Aijun Wang China Telecom =20 From: Robert Raszuk >=20 Sent: Wednesday, November 18, 2020 3:49 PM To: Jeff Tantsura > Cc: Gyan Mishra >; = Acee Lindem (acee) >; lsr = >; Aijun Wang = >; Acee = Lindem (acee) > Subject: Re: [Lsr] Prefix Unreachable Announcement Use Cases =20 Jeff, =20 Please notice that WAN is not an IX.=20 =20 While you can have full mesh of BFD sessions among all IXP participants = each bombarding each over over TB fabric every 100 ms or so to map the = same over global WAN is a different game. If nothing else RTT between = IXP participants in healthy IX is around 1 ms while RTT between PEs = distributed globally is often 100-200 ms.=20 =20 Just imagine 1000 PEs in 10 areas distributed all over the world. That = means that in worst case scenario (say same mgmt VPN present on each PE) = you will establish 1000*999 BFD sessions. Now for this to make sense = timer needs to be 100 ms or so with 3x or 5x multiplier. Anything slower = will defeat the purpose as BGP withdraw will be faster.=20 =20 Then we go into queuing issues. If BFD packets are queued at any = interface meltdowns may occur which can be far worse in consequences = then waiting for BGP service route removal. Such meltdowns often result = in cascading effects to the applications itself.=20 =20 So this is not at all about autodiscovery with which address to setup = the BFD session. It is much more about operational aspects of going that = direction.=20 =20 With that I am supportive of this work even if we label it as = experimental for some time. As each network is different what is optimal = solution for one design and deployment may not be optimal for the other. = =20 Many thx, Robert =20 =20 On Wed, Nov 18, 2020 at 4:34 AM Jeff Tantsura > wrote: We have been discussing for quite some time and in different wg's = (there=E2=80=99s IX with RS use case) BFD verification based on next-hop = extraction, Robert - you should know. (also built a well working = prototype in previous life).=20 Very simple logic: Upon route import (BGP update received and imported), extract next-hop, = walk BFD session table, if no match (no existing session) - establish = (S)BFD session (Discriminators distribution is a solved problem) to the = next-hop, associate fate of all routes received from it, keep timers = reasonable to prevent false positives. State is limited to PE=E2=80=99s importing each others routes (sharing a = service) only High degree of automation No IGP pollution=20 =20 Cheers,=20 Jeff On Nov 17, 2020, 6:43 AM -0800, Acee Lindem (acee) >, wrote: Speaking as WG member: =20 I think it would be good to hone in on the BGP PE failure convergence = use case as suggested by Robert. It seems there is some interest here = although I=E2=80=99m not convinced the IGP is the right place to solve = this problem. =20 Thanks, Acee =20 From: Lsr > on = behalf of Gyan Mishra > Date: Tuesday, November 17, 2020 at 4:02 AM To: Robert Raszuk > Cc: lsr >, Jeff Tantsura = >, Aijun Wang = >, "Acee = Lindem (acee)" > Subject: Re: [Lsr] Prefix Unreachable Announcement Use Cases =20 =20 =20 On Tue, Nov 17, 2020 at 3:36 AM Robert Raszuk > wrote: =20 =20 Robert, I believe the original intention was related to having the = data plane converge quickly when summarization is used and flip so = traffic converges from the Active ABR to the Backup ABR.=20 =20 I do not buy this use case. Flooding within the area is fast such that = both ABRs will get the same info. As mentioned before there is no = practical use of PUA for making any routing or fwd decision on which ABR = to use. If your ABRs are not connected with min redundancy this draft is = a worst patch ever to work around such a design.=20 =20 Gyan> Agreed. The point of PUA in ABR use case is the ability to = track the component prefixes and in case where component is down and = traffic is still forwarded to the ABR and dropped. The other more = important use case is when links are down within the area and the area = is partitioned and so one ABR has all component prefixes however other = ABR is missing half the component prefixes. So since the ABR will by = default advertise the summary as long as their is one component UP the = summary is still advertised. So this use case is severely impacting as = now you have an ECMP path to the other area for the summary via the two = ABRs and you drop half your traffic. So now with PUA the problem is = fixed and the PUA is sent and now traffic is only sent to the ABR that = has the component prefixes. =20 Please present us a picture indicating before and after ABRs behaviour.=20 =20 Gyan> will do=20 =20 However PUA can be used in the absence of area segmentation within a = single area when a link or node fails to converge the data plane quickly = by sending PUA for the backup path so the active path.=20 =20 If there is no area segmentation then there is no summaries. So what are = we missing in the first place ?=20 =20 Gyan> Sorry I am stating that PUA feature can also be used intra = area where if a link or node goes down to improve data plane = convergence. =20 =20 With the IGP tuned with BFD fast detection on ISIS or OSPF links and LFA = & RLFA for MPLS or TI-LFA for SR local protection - with those tweaks = the convergence is well into sub second. So for Intra area convergence = with all the optimizations mentioned I am not sure how much faster the = data plane will converge with PUA. =20 Even without any of the above listed chain of acronymous things will = generally work well intra-area without PUAs.=20 =20 Gyan> Agreed which is why I mentioned the BGP next hop self use case = if I could figure out how PUA could help there that would be a major = benefit of PUA. =20 Thx, R. =20 =20 -- <> Gyan Mishra Network Solutions Architect=20 M 301 502-1347 13101 Columbia Pike=20 Silver Spring, MD =20 ------=_NextPart_000_00D5_01D6BE60.002A5340 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable

H= i, Acee:

<= o:p> 

O= K, we will try to improve this document to meet this criteria. =

A= nd, as this topic has been discussed intensely on the mail list, we are = also eager to invite more interested experts to join us as co-authors to = refine the solutions for more scenarios.

<= o:p> 

T= hanks in advance.

<= o:p> 

B= est Regards

<= o:p> 

A= ijun Wang

C= hina Telecom

<= o:p> 

<= o:p> 

From:<= /b> Acee Lindem = (acee) <acee@cisco.com>
Sent: Thursday, November 19, = 2020 12:42 AM
To: Aijun Wang = <wangaijun@tsinghua.org.cn>; 'Robert Raszuk' = <robert@raszuk.net>; 'Jeff Tantsura' = <jefftant.ietf@gmail.com>
Cc: 'Gyan Mishra' = <hayabusagsm@gmail.com>; 'lsr' <lsr@ietf.org>; 'Acee Lindem = (acee)' <acee=3D40cisco.com@dmarc.ietf.org>
Subject: Re: = [Lsr] Prefix Unreachable Announcement Use = Cases

 

Speaking as = WG Co-Chair:

 

From: Aijun Wang <wangaijun@tsinghua.org.cn&g= t;
Date: Wednesday, November 18, 2020 at 3:05 AM
To: = Robert Raszuk <robert@raszuk.net>, Jeff = Tantsura <jefftant.ietf@gmail.com>Cc: 'Gyan Mishra' <hayabusagsm@gmail.com>, = Acee Lindem <acee@cisco.com>, 'lsr' <lsr@ietf.org>, "'Acee Lindem = (acee)'" <acee=3D40cisco.com@dmar= c.ietf.org>
Subject: RE: [Lsr] Prefix Unreachable = Announcement Use Cases

 

H= i, Robert:

&= nbsp;

T= he trigger and propagation of PUA info can be standardized, the actions = based on the PUA can be different in different situation.

W= e can discuss and describe the actions based on different scenarios = after its WG adoption?

 

There will = be no adoption call until there is a coherent draft with use case(s) and = viable actions.

 

Thanks,<= /o:p>

Acee

&= nbsp;

&= nbsp;

B= est Regards

&= nbsp;

A= ijun Wang

C= hina Telecom

&= nbsp;

From:<= /b> Robert = Raszuk <robert@raszuk.net> =
Sent: Wednesday, November 18, 2020 3:49 PM
To: Jeff = Tantsura <jefftant.ietf@gmail.com>Cc: Gyan Mishra <hayabusagsm@gmail.com>; = Acee Lindem (acee) <acee@cisco.com>; lsr <lsr@ietf.org>; Aijun Wang <wangaijun@tsinghua.org.cn&g= t;; Acee Lindem (acee) <acee=3D40cisco.com@dmar= c.ietf.org>
Subject: Re: [Lsr] Prefix Unreachable = Announcement Use Cases

 

Jeff,

 

Please notice that WAN is not an = IX. 

 

While you can have full mesh of BFD sessions among all IXP = participants each bombarding each over over TB fabric every 100 ms or so = to map the same over global WAN is a different game. If nothing else RTT = between IXP participants in healthy IX is around 1 ms while RTT between = PEs distributed globally is often 100-200 = ms. 

 

Just imagine 1000 PEs in 10 areas distributed all over the = world. That means that in worst case scenario (say same mgmt VPN present = on each PE) you will establish 1000*999 BFD sessions. Now for this to = make sense timer needs to be 100 ms or so with 3x or 5x multiplier. = Anything slower will defeat the purpose as BGP withdraw will be = faster. 

 

Then we go into queuing issues. If BFD packets are queued = at any interface meltdowns may occur which can be far worse in = consequences then waiting for BGP service route removal. Such meltdowns = often result in cascading effects to the applications = itself. 

 

So this is not at all about autodiscovery with which = address to setup the BFD session. It is much more about operational = aspects of going that = direction. 

 

With that I am supportive of this work even if we label it = as experimental for some time. As each network is different what is = optimal solution for one design and deployment may not be optimal for = the other. 

 

Many thx,

Robert

 

 

On Wed, Nov 18, 2020 at 4:34 AM Jeff Tantsura <jefftant.ietf@gmail.com> = wrote:

We have been discussing for quite some time and in = different wg's (there=E2=80=99s IX with RS use = case) BFD verification based on next-hop extraction, Robert - you should = know. (also built a well working prototype in previous = life). 

Very simple logic:

Upon route import (BGP = update received and imported), extract next-hop, walk BFD session table, = if no match (no existing session) - establish (S)BFD session = (Discriminators distribution is a solved problem) to the next-hop, = associate fate of all routes received from it, keep timers reasonable to = prevent false positives.

State is limited to = PE=E2=80=99s importing each others routes = (sharing a service) only
High degree of automation
No IGP = pollution 

 

Cheers,

Jeff

On = Nov 17, 2020, 6:43 AM -0800, Acee Lindem (acee) <acee@cisco.com>, = wrote:

Speaking as WG = member:

 

I think it would be good to hone in on = the BGP PE failure convergence use case as suggested by Robert. It seems = there is some interest here although I=E2=80=99m not convinced the IGP is the right place to solve this = problem.

 

Thanks,

Acee

 

From: Lsr <lsr-bounces@ietf.org> on behalf of Gyan Mishra = <hayabusagsm@gmail.com>
Date: Tuesday, = November 17, 2020 at 4:02 AM
To: Robert Raszuk <robert@raszuk.net>
Cc: lsr <lsr@ietf.org>, = Jeff Tantsura <jefftant.ietf@gmail.com>, Aijun Wang <wangaijun@tsinghua.org.cn>, "Acee Lindem = (acee)" <acee=3D40cisco.com@dmarc.ietf.org>
Subject: = Re: [Lsr] Prefix Unreachable Announcement Use = Cases

 

 

 

On Tue, Nov 17, 2020 at 3:36 AM Robert = Raszuk <robert@raszuk.net> = wrote:

 

 

   Robert, I believe the = original intention was related to having the data plane converge quickly = when summarization is used and flip so traffic converges from the Active = ABR to the Backup = ABR. 

 

I do not buy this use case. Flooding = within the area is fast such that both ABRs will get the same info. As = mentioned before there is no practical use of PUA for making any routing = or fwd decision on which ABR to use. If your ABRs are not connected with = min redundancy this draft is a worst patch ever to work around such a = design. 

 

   Gyan> Agreed.  The = point of PUA in ABR use case is the ability to track the component = prefixes and in case where component is down and traffic is still = forwarded to the ABR and dropped.  The other more important use = case is when links are down within the area and the area is partitioned = and so one ABR has all component prefixes however other ABR is missing = half the component prefixes.  So since the ABR will by default = advertise the summary as long as their is one component UP the summary = is still advertised.  So this use case is severely impacting as now = you have an ECMP path to the other area for the summary via the two ABRs = and you drop half your traffic.  So now with PUA the problem is = fixed and the PUA is sent and now traffic is only sent to the ABR that = has the component prefixes.

 

Please present us a picture indicating = before and after ABRs = behaviour. 

 

     Gyan> will = do 

 

   However PUA can be used in = the absence of area segmentation within a single area when a link or = node fails to converge the data plane quickly by sending PUA for the = backup path so the active = path. 

 

If there is no area segmentation then = there is no summaries. So what are we missing in the first place = ? 

 

    Gyan> Sorry I am = stating that PUA feature can also be used intra area where if a link or = node goes down to improve data plane = convergence.

 

 

With the IGP tuned with BFD fast = detection on ISIS or OSPF links and LFA & RLFA for MPLS or TI-LFA = for SR local protection - with those tweaks the convergence is well into = sub second.  So for Intra area convergence with all the = optimizations mentioned I am not sure how much faster the data plane = will converge with = PUA.

 

Even without any of the above listed = chain of acronymous things will generally work well intra-area without = PUAs. 

 

    Gyan> Agreed which is = why I mentioned the BGP next hop self use case if I could figure out how = PUA could help there that would be a major benefit of = PUA.

 

Thx,
R.

 

 

<= /div>

--

<= div>

<>

Gyan = Mishra

Network Solutions = Architect 

M 301 = 502-1347
13101 Columbia Pike 
Silver Spring, MD

 

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X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 542883A167F for ; Thu, 19 Nov 2020 18:28:12 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.087 X-Spam-Level: X-Spam-Status: No, score=-2.087 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_REMOTE_IMAGE=0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id QoXPUcjByacG for ; Thu, 19 Nov 2020 18:28:09 -0800 (PST) Received: from mail-pg1-x536.google.com (mail-pg1-x536.google.com [IPv6:2607:f8b0:4864:20::536]) 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h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=BLxu9YDKNEMUUkq+YM7n6/onq0Lcgnp6puFDm45ldDk=; b=TAdLVhh9vwGqbvZq1pM3Lmjk2iB8x6bu9X8/6zHjZwhWzVr57/2PeUCHqsbNNPMSZ3 GLrfZ3HIaXbS0KQvLIcJ4NgLpWEysS4mim4TVS1lHOcdyf40A+TIv4HiEZKE+HG4b7GY xx4J6YaOnLWxGKhqxoY+eAaWxIi6KtKlW3n80XlZ3V6Yzgnn0xg3/oZHoTh2ha40KaCz g/5ugQtAya+VZZoBJJF4sXGyBY/EPJ/axW9NLUrdEolp+ev3DeWtZnHPnKhlIJxUMU1H dqjOop7Cxw792B5FtI2SD2J/G5SzVXjoIW99v6WSAHrarSQU+xYU1zDtZXbOs+H7diQF 80WA== X-Gm-Message-State: AOAM533B0ObJSsdB1g+jA211AwloPBthjEW1noyTM9es3pPl2EdGFz/8 1U7mAHm+JeDyK9mbHvywgR/ePA2oclWQ6X6JFP70GyRy/+8= X-Google-Smtp-Source: ABdhPJxN6yyt1F9ZR484YVwbnTY+DrW+QBiTYC0d/v3UjunoWHYgUdnkXTyB3bp+vzyIhwLbu5/9G9vEcwochRRnOCY= X-Received: by 2002:a65:4241:: with SMTP id d1mr14671357pgq.18.1605839288806; Thu, 19 Nov 2020 18:28:08 -0800 (PST) MIME-Version: 1.0 References: <016b01d6bca9$cf908c20$6eb1a460$@tsinghua.org.cn> <32DFCE3A-D41C-48CA-928A-37011D158AEF@cisco.com> <019901d6bd81$9565b5b0$c0312110$@tsinghua.org.cn> <2C21FE6C-4AC0-4949-ADE0-357DD7E18A87@cisco.com> <00d401d6be1c$f2027f60$d6077e20$@tsinghua.org.cn> In-Reply-To: <00d401d6be1c$f2027f60$d6077e20$@tsinghua.org.cn> From: Gyan Mishra Date: Thu, 19 Nov 2020 21:27:57 -0500 Message-ID: To: Aijun Wang Cc: "Acee Lindem (acee)" , "Acee Lindem (acee)" , Jeff Tantsura , Robert Raszuk , lsr Content-Type: multipart/alternative; boundary="0000000000006030cc05b48098f0" Archived-At: Subject: Re: [Lsr] Prefix Unreachable Announcement Use Cases X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 20 Nov 2020 02:28:12 -0000 --0000000000006030cc05b48098f0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Aijun I am thinking per the feedback received let=E2=80=99s keep it really simple= . We need a solid use case to move the ball forward were the PUA data plane convergence capabilities can fills a gap that exists today. I have two simple solutions to start that I will update the presentation with to start and present to the WG and we can go from there. 1. BGP NH tracking via PUA of NH component prefix to converge the data plane 2. Area partitioned scenario where PUA is used for data plane convergence to ABR that has reachability to component prefixes. I will send out tomorrow. Thanks Gyan On Wed, Nov 18, 2020 at 9:37 PM Aijun Wang wrote: > Hi, Acee: > > > > OK, we will try to improve this document to meet this criteria. > > And, as this topic has been discussed intensely on the mail list, we are > also eager to invite more interested experts to join us as co-authors to > refine the solutions for more scenarios. > > > > Thanks in advance. > > > > Best Regards > > > > Aijun Wang > > China Telecom > > > > > > *From:* Acee Lindem (acee) > *Sent:* Thursday, November 19, 2020 12:42 AM > *To:* Aijun Wang ; 'Robert Raszuk' < > robert@raszuk.net>; 'Jeff Tantsura' > *Cc:* 'Gyan Mishra' ; 'lsr' ; 'Acee > Lindem (acee)' > *Subject:* Re: [Lsr] Prefix Unreachable Announcement Use Cases > > > > Speaking as WG Co-Chair: > > > > *From: *Aijun Wang > *Date: *Wednesday, November 18, 2020 at 3:05 AM > *To: *Robert Raszuk , Jeff Tantsura < > jefftant.ietf@gmail.com> > *Cc: *'Gyan Mishra' , Acee Lindem = , > 'lsr' , "'Acee Lindem (acee)'" < > acee=3D40cisco.com@dmarc.ietf.org> > *Subject: *RE: [Lsr] Prefix Unreachable Announcement Use Cases > > > > Hi, Robert: > > > > The trigger and propagation of PUA info can be standardized, the actions > based on the PUA can be different in different situation. > > We can discuss and describe the actions based on different scenarios afte= r > its WG adoption? > > > > There will be no adoption call until there is a coherent draft with use > case(s) and viable actions. > > > > Thanks, > > Acee > > > > > > Best Regards > > > > Aijun Wang > > China Telecom > > > > *From:* Robert Raszuk > *Sent:* Wednesday, November 18, 2020 3:49 PM > *To:* Jeff Tantsura > *Cc:* Gyan Mishra ; Acee Lindem (acee) < > acee@cisco.com>; lsr ; Aijun Wang ; > Acee Lindem (acee) > *Subject:* Re: [Lsr] Prefix Unreachable Announcement Use Cases > > > > Jeff, > > > > Please notice that WAN is not an IX. > > > > While you can have full mesh of BFD sessions among all IXP participants > each bombarding each over over TB fabric every 100 ms or so to map the sa= me > over global WAN is a different game. If nothing else RTT between IXP > participants in healthy IX is around 1 ms while RTT between PEs distribut= ed > globally is often 100-200 ms. > > > > Just imagine 1000 PEs in 10 areas distributed all over the world. That > means that in worst case scenario (say same mgmt VPN present on each PE) > you will establish 1000*999 BFD sessions. Now for this to make sense time= r > needs to be 100 ms or so with 3x or 5x multiplier. Anything slower will > defeat the purpose as BGP withdraw will be faster. > > > > Then we go into queuing issues. If BFD packets are queued at any interfac= e > meltdowns may occur which can be far worse in consequences then waiting f= or > BGP service route removal. Such meltdowns often result in cascading effec= ts > to the applications itself. > > > > So this is not at all about autodiscovery with which address to setup the > BFD session. It is much more about operational aspects of going that > direction. > > > > With that I am supportive of this work even if we label it as experimenta= l > for some time. As each network is different what is optimal solution for > one design and deployment may not be optimal for the other. > > > > Many thx, > > Robert > > > > > > On Wed, Nov 18, 2020 at 4:34 AM Jeff Tantsura > wrote: > > We have been discussing for quite some time and in different wg's (there= =E2=80=99s > IX with RS use case) BFD verification based on next-hop extraction, Rober= t > - you should know. (also built a well working prototype in previous life)= . > > Very simple logic: > > Upon route import (BGP update received and imported), extract next-hop, > walk BFD session table, if no match (no existing session) - establish > (S)BFD session (Discriminators distribution is a solved problem) to the > next-hop, associate fate of all routes received from it, keep timers > reasonable to prevent false positives. > > State is limited to PE=E2=80=99s importing each others routes (sharing a = service) > only > High degree of automation > No IGP pollution > > > > Cheers, > > Jeff > > On Nov 17, 2020, 6:43 AM -0800, Acee Lindem (acee) , > wrote: > > Speaking as WG member: > > > > I think it would be good to hone in on the BGP PE failure convergence use > case as suggested by Robert. It seems there is some interest here althoug= h I > =E2=80=99m not convinced the IGP is the right place to solve this problem= . > > > > Thanks, > > Acee > > > > *From:* Lsr on behalf of Gyan Mishra < > hayabusagsm@gmail.com> > *Date:* Tuesday, November 17, 2020 at 4:02 AM > *To:* Robert Raszuk > *Cc:* lsr , Jeff Tantsura , Aijun > Wang , "Acee Lindem (acee)" 40cisco.com@dmarc.ietf.org> > *Subject:* Re: [Lsr] Prefix Unreachable Announcement Use Cases > > > > > > > > On Tue, Nov 17, 2020 at 3:36 AM Robert Raszuk wrote: > > > > > > Robert, I believe the original intention was related to having the dat= a > plane converge quickly when summarization is used and flip so traffic > converges from the Active ABR to the Backup ABR. > > > > I do not buy this use case. Flooding within the area is fast such that > both ABRs will get the same info. As mentioned before there is no practic= al > use of PUA for making any routing or fwd decision on which ABR to use. If > your ABRs are not connected with min redundancy this draft is a worst pat= ch > ever to work around such a design. > > > > Gyan> Agreed. The point of PUA in ABR use case is the ability to trac= k > the component prefixes and in case where component is down and traffic is > still forwarded to the ABR and dropped. The other more important use cas= e > is when links are down within the area and the area is partitioned and so > one ABR has all component prefixes however other ABR is missing half the > component prefixes. So since the ABR will by default advertise the summa= ry > as long as their is one component UP the summary is still advertised. So > this use case is severely impacting as now you have an ECMP path to the > other area for the summary via the two ABRs and you drop half your > traffic. So now with PUA the problem is fixed and the PUA is sent and no= w > traffic is only sent to the ABR that has the component prefixes. > > > > Please present us a picture indicating before and after ABRs behaviour. > > > > Gyan> will do > > > > However PUA can be used in the absence of area segmentation within a > single area when a link or node fails to converge the data plane quickly = by > sending PUA for the backup path so the active path. > > > > If there is no area segmentation then there is no summaries. So what are > we missing in the first place ? > > > > Gyan> Sorry I am stating that PUA feature can also be used intra area > where if a link or node goes down to improve data plane convergence. > > > > > > With the IGP tuned with BFD fast detection on ISIS or OSPF links and LFA = & > RLFA for MPLS or TI-LFA for SR local protection - with those tweaks the > convergence is well into sub second. So for Intra area convergence with > all the optimizations mentioned I am not sure how much faster the data > plane will converge with PUA. > > > > Even without any of the above listed chain of acronymous things will > generally work well intra-area without PUAs. > > > > Gyan> Agreed which is why I mentioned the BGP next hop self use case > if I could figure out how PUA could help there that would be a major > benefit of PUA. > > > > Thx, > R. > > > > > > -- > > <> > > *Gyan Mishra* > > *Network Solutions Architect * > > > > *M 301 502-134713101 Columbia Pike > *Silver > Spring, MD > > > > > -- *Gyan Mishra* *Network Solutions A**rchitect * *M 301 502-134713101 Columbia Pike *Silver Spring, MD --0000000000006030cc05b48098f0 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

Aijun=C2=A0

I am thinking per the feedback received let=E2=80=99s = keep it really simple.=C2=A0 We need a solid use case to move the ball forw= ard were the PUA data plane convergence capabilities can fills a gap that e= xists today.=C2=A0

I hav= e two simple solutions to start that I will update the presentation with to= start and present to the WG and we can go from there.

1.=C2=A0 BGP NH tracking via PUA of NH compo= nent prefix to converge the data plane

2.=C2=A0 Area partitioned scenario where PUA is used for dat= a plane convergence to ABR that has reachability to component prefixes. =C2= =A0

I will send out tomo= rrow.

Thanks=C2=A0
=

Gyan

On Wed, Nov 18, 2020= at 9:37 PM Aijun Wang <wan= gaijun@tsinghua.org.cn> wrote:

Hi, Ac= ee:

=C2=A0

OK, we w= ill try to improve this document to meet this criteria.

And, as this topic has been = discussed intensely on the mail list, we are also eager to invite more inte= rested experts to join us as co-authors to refine the solutions for more sc= enarios.

<= u>=C2=A0

Than= ks in advance.

=C2=A0

Best Regards

=C2=A0

Aijun Wang

China Telecom<= /span>

=C2=A0

=C2=A0

= From: Acee Lindem (acee) <acee@cisco.com>
Sent: Th= ursday, November 19, 2020 12:42 AM
To: Aijun Wang <wangaijun@tsinghua.org.= cn>; 'Robert Raszuk' <robert@raszuk.net>; 'Jeff Tantsura' <= jefftant.ietf@= gmail.com>
Cc: 'Gyan Mishra' <hayabusagsm@gmail.com>; &#= 39;lsr' <lsr@ietf.= org>; 'Acee Lindem (acee)' <acee=3D40cisco.com@dmarc.ietf.org>= ;
Subject: Re: [Lsr] Prefix Unreachable Announcement Use Cases=

=C2=A0

Speaking as WG Co-C= hair:

=C2=A0

From: Aiju= n Wang <w= angaijun@tsinghua.org.cn>
Date: Wednesday, November 18, 20= 20 at 3:05 AM
To: Robert Raszuk <robert@raszuk.net>, Jeff Tantsura <jefftant.ietf@gmai= l.com>
Cc: 'Gyan Mishra' <hayabusagsm@gmail.com>, Acee L= indem <acee@cisco.co= m>, 'lsr' <lsr@ietf.org>, "'Acee Lindem (acee)'" <acee=3D4= 0cisco.com@dmarc.ietf.org>
Subject: RE: [Lsr] Prefix Unrea= chable Announcement Use Cases

=C2=A0

Hi, Robert:

=C2=A0=

The trigger and propagation of PUA info can be standardized, t= he actions based on the PUA can be different in different situation.

We can discuss and describe the a= ctions based on different scenarios after its WG adoption?

=C2=A0

There will be no adoption call until th= ere is a coherent draft with use case(s) and viable actions. =

=C2=A0

Thanks,

Acee

=C2=A0

=C2=A0

Best Regards

=

=C2=A0

Aijun= Wang

China Telecom

=C2=A0

From:<= /span> Robert Raszuk <robert@raszuk.net>
Sent: Wednesd= ay, November 18, 2020 3:49 PM
To: Jeff Tantsura <jefftant.ietf@gmail.com= >
Cc: Gyan Mishra <hayabusagsm@gmail.com>; Acee Lindem (acee) <acee@cisco.com>; l= sr <lsr@ietf.org&g= t;; Aijun Wang <wangaijun@tsinghua.org.cn>; Acee Lindem (acee) <acee=3D40cisco= .com@dmarc.ietf.org>
Subject: Re: [Lsr] Prefix Unreachable= Announcement Use Cases

= =C2=A0

Jeff,

=C2=A0

Please notice that WAN is not an IX.=C2=A0<= u>

=C2=A0

=

Wh= ile you can have full mesh of BFD sessions among all IXP participants each = bombarding each over over TB fabric every 100 ms or so to map the same over= global WAN is a different game. If nothing else RTT between IXP participan= ts in healthy IX is around 1 ms while RTT between PEs distributed globally = is often 100-200 ms.=C2=A0

=C2=A0

Just imagine 1000 PEs in 10 areas distributed all = over the world. That means that in worst case scenario (say same mgmt VPN p= resent on each PE) you will establish 1000*999 BFD sessions. Now for this t= o make sense timer needs to be 100 ms or so with 3x or 5x multiplier. Anyth= ing slower will defeat the purpose as BGP withdraw will be faster.=C2=A0=

=C2=A0

Then= we go into queuing issues. If BFD packets are queued at any interface melt= downs may occur which can be far worse in consequences then waiting for BGP= service route removal. Such meltdowns often result in cascading effects to= the applications itself.=C2=A0

=C2=A0<= /u>

So this is not at all about autodiscovery wit= h which address to setup=C2=A0the BFD session. It is much more about operat= ional aspects of going that direction.=C2=A0

=

=C2=A0

With that I am supportive of t= his work even if we label it as experimental for some time. As each network= is different what is optimal solution for one design and deployment may no= t be optimal for the other.=C2=A0

=C2=A0

Many thx,

= Robert

=C2=A0

=C2=A0

On Wed, Nov 18, 2020 at 4:34 A= M Jeff Tantsura <jefftant.ietf@gmail.com> wrote:

=

We have been discuss= ing for quite some time and in different wg's (there=E2=80=99s IX with RS use case) BFD verification based on next-hop= extraction, Robert - you should know. (also built a well working prototype= in previous life).=C2=A0

Very simple logic:

Upon route impor= t (BGP update received and imported), extract next-hop, walk BFD session ta= ble, if no match (no existing session) - establish (S)BFD session (Discrimi= nators distribution is a solved problem) to the next-hop, associate fate of= all routes received from it, keep timers reasonable to prevent false posit= ives.

State is limited to PE=E2=80=99s i= mporting each others routes (sharing a service) only
High degree of auto= mation
No IGP pollution=C2=A0

=C2=A0

Cheers,

Jeff

On Nov = 17, 2020, 6:43 AM -0800, Acee Lindem (acee) <acee@cisco.com>, wrote:

Speaking as WG member:

=C2=A0

I think it would be good to hone in= on the BGP PE failure convergence use case as suggested by Robert. It seem= s there is some interest here although I=E2=80=99m not convinced the IGP is the right place to solve this problem.<= u>

=C2=A0

Thanks,

= Acee

=C2=A0

From: Lsr <l= sr-bounces@ietf.org> on behalf of Gyan Mishra <hayabusagsm@gmail.com>
<= b>Date: Tuesday, November 17, 2020 at 4:02 AM
To: Robert Rasz= uk <robert@raszuk= .net>
Cc: lsr <lsr@ietf.org>, Jeff Tantsura <jefftant.ietf@gmail.com>, Aiju= n Wang <w= angaijun@tsinghua.org.cn>, "Acee Lindem (acee)" <acee= =3D40cisco.= com@dmarc.ietf.org>
Subject: Re: [Lsr] Prefix Unreachable = Announcement Use Cases

=C2=A0=

=C2=A0

<= p class=3D"MsoNormal" style=3D"margin-left:114.0pt">= =C2=A0

On Tue, Nov 17, 2020 at 3:36 AM Rob= ert Raszuk <rober= t@raszuk.net> wrote:

=C2=A0

=C2=A0<= /p>

=C2=A0 =C2=A0Robert, I believe th= e original intention was related to having the data plane converge quickly = when summarization is used and flip so traffic converges from the Active AB= R to the Backup ABR.=C2=A0

=C2=A0

I do not buy this use c= ase. Flooding within the area is fast such that both ABRs will get the same= info. As mentioned before there is no practical use of PUA for making any = routing or fwd decision on which ABR to use. If your ABRs are not connected= with min redundancy this draft is a worst patch ever to work around such a= design.=C2=A0

=

= =C2=A0

=C2=A0 =C2=A0Gyan> Agreed.=C2= =A0 The point of PUA in ABR use case is the ability to track the component = prefixes and in case where component is down and traffic is still forwarded= to the ABR and dropped.=C2=A0 The other more important use case is when li= nks are down within the area and the area is partitioned and so one ABR has= all component prefixes however other ABR is missing half the component pre= fixes.=C2=A0 So since the ABR will by default advertise the summary as long= as their is one component UP the summary is still advertised.=C2=A0 So thi= s use case is severely impacting as now you have an ECMP path to the other = area for the summary via the two ABRs and you drop half your traffic.=C2=A0= So now with PUA the problem is fixed and the PUA is sent and now traffic i= s only sent to the ABR that has the component prefixes.

=C2=A0

Please present us a picture indicating before and after ABRs behaviour= .=C2=A0

=C2=A0

=C2=A0 =C2=A0 =C2=A0Gyan> will do=C2=A0=

=C2=A0=

=C2=A0 =C2=A0However PUA c= an be used in the absence of area segmentation within a single area when a = link or node fails to converge the data plane quickly by sending PUA for th= e backup path so the active path.=C2=A0

=C2=A0

If there = is no area segmentation then there is no summaries. So what are we missing = in the first place ?=C2=A0

=C2=A0

=C2=A0 =C2=A0 Gyan> = Sorry I am stating that PUA feature can also be used intra area where if a = link or node goes down to improve data plane convergence.

=C2=A0

=C2=A0

Wit= h the IGP tuned with BFD fast detection on ISIS or OSPF links and LFA &= RLFA for MPLS or TI-LFA for SR local protection - with those tweaks the co= nvergence is well into sub second.=C2=A0 So for Intra area convergence with= all the optimizations mentioned I am not sure how much faster the data pla= ne will converge with PUA.

=C2=A0

Even without any of the= above listed chain of acronymous things will generally work well intra-are= a without PUAs.=C2=A0

=C2=A0

=C2=A0 =C2=A0 Gyan> Agree= d which is why I mentioned the BGP next hop self use case if I could figure= out how PUA could help there that would be a major benefit of PUA.<= u>

=C2=A0

Thx,
R.

=C2=A0=

=C2=A0

--

<>

Gyan Mishra

Network Sol= utions Architect=C2=A0=

M 301 502-1347
13101 Columbia Pike=C2=A0
Silver Spring,= MD

=C2= =A0

--

Gyan Mishra

=

Network Solutions A<= /i>rchitect=C2=A0=

M 301 502-1347
13101 Columbia Pi= ke=C2=A0
Silver Spring, MD


--0000000000006030cc05b48098f0-- From nobody Thu Nov 19 19:06:12 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6E43A3A171A for ; Thu, 19 Nov 2020 19:06:10 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.896 X-Spam-Level: X-Spam-Status: No, score=-1.896 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id fpWipau3fO3j for ; Thu, 19 Nov 2020 19:06:06 -0800 (PST) Received: from mail-m127101.qiye.163.com (mail-m127101.qiye.163.com [115.236.127.101]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 6CB093A1715 for ; Thu, 19 Nov 2020 19:06:05 -0800 (PST) Received: from DESKTOP2IOH5QC (unknown [219.142.69.75]) by mail-m127101.qiye.163.com (Hmail) with ESMTPA id 6174E4782C; Fri, 20 Nov 2020 11:06:01 +0800 (CST) From: "Aijun Wang" To: "'Acee Lindem \(acee\)'" , Date: Fri, 20 Nov 2020 11:06:00 +0800 Message-ID: <013901d6beea$139cdbc0$3ad69340$@tsinghua.org.cn> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_013A_01D6BF2D.21C12D30" X-Mailer: Microsoft Outlook 16.0 Thread-Index: Ada+4P4oGFIzbCyvQOeIziNqieJ4RQ== Content-Language: zh-cn X-HM-Spam-Status: e1kfGhgUHx5ZQUtXWQgYFAkeWUFZS1VLWVdZKFlBSkxLS0o3V1ktWUFJV1 kPCRoVCBIfWUFZTUtCTh1JH0NNQk4fVkpNS05DT0pOTUpOSEhVEwETFhoSFyQUDg9ZV1kWGg8SFR 0UWUFZT0tIVUpKS09ISFVLWQY+ X-HM-Sender-Digest: e1kMHhlZQR0aFwgeV1kSHx4VD1lBWUc6MU06KAw6Pz8tGQxJFDorLCIv TU1PCk9VSlVKTUtOQ09KTk1JS05PVTMWGhIXVQwaFRwaEhEOFTsPCBIVHBMOGlUUCRxVGBVFWVdZ EgtZQVlJSkJVSk9JVU1CVUxOWVdZCAFZQUpPTEtONwY+ X-HM-Tid: 0a75e39da7759865kuuu6174e4782c Archived-At: Subject: Re: [Lsr] IETF I09 LSR Meeting Minutes(Responses for comments on "passive interface attribute" draft) X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 20 Nov 2020 03:06:10 -0000 This is a multipart message in MIME format. ------=_NextPart_000_013A_01D6BF2D.21C12D30 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable HI, Acee: =20 Thanks for the minutes, and also thanks for Yingzhen.=20 =20 Below are the responses for the comments regarding to = draft-wang-lsr-passive-interface-attribute-06 = , please see whether they address your concern or not. For simplicity, I just summary the key points of the comments. =E3=80=90Chris=E3=80=91: Why not using the existed TLV to solve the = Inter-as use case? =E3=80=90Reply-from Aijun Wang=E3=80=91: For inter-AS use case, using = the existed TLV has the constraints that described in = https://mailarchive.ietf.org/arch/msg/lsr/VLufuaGDiRgaflcu58FY_SHnJ7A/ =20 =E3=80=90Chris=E3=80=91: Why not using prefix attributes to advertise = application server=E2=80=99s information? =E3=80=90Reply-from Aijun Wang=E3=80=91: It is possible to advertise = these information together with prefix. But when we want to describe the = resources(for example, link bandwidth, link utilization ratio etc.) to = the prefix, it is more reasonable to associated them to link attributes. =20 On summary, considering the above two use case has the common = characteristic, that is, the associated link is stub-link, we think that = defines the stub-link TLV to contain the these information is more = extensible. =20 =E3=80=90Acee=E3=80=91: Why not just advertise the link is the inter-AS = boundary or other , and doesn=E2=80=99t need to infer this conclusion?=20 =E3=80=90Reply-from Aijun Wang=E3=80=91: If necessary, we can add one = flag field to indicate clearly the sub-type of the stub-link. But = currently, they are all passive-interface, has no other distinguished = differences. The usage of such information, or the inferences method, may be = different in different scenario. I think the standardization work should = defines the fundamental common parts. =20 =20 Best Regards =20 Aijun Wang China Telecom =20 From: lsr-bounces@ietf.org On Behalf Of Acee = Lindem (acee) Sent: Friday, November 20, 2020 6:17 AM To: lsr@ietf.org Subject: [Lsr] IETF I09 LSR Meeting Minutes =20 I have uploaded the minutes for the meeting on Monday morning. Thanks = much to Yingzhen Qu for taking them. Please send me any additions or = corrections to me. =20 https://datatracker.ietf.org/doc/minutes-109-lsr/ =20 Presenters and draft authors, please note that if more discussion is = need on your draft then it is up to you to initiate such discussion.=20 =20 Thanks, Acee ------=_NextPart_000_013A_01D6BF2D.21C12D30 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable

H= I, Acee:

<= o:p> 

T= hanks for the minutes, and also thanks for Yingzhen. =

<= o:p> 

B= elow are the responses for the comments regarding to draft-wang-lsr-passive-interface-attribute-06, = please see whether they address your concern or = not.

F= or simplicity, I just summary the key points of the = comments.

=E3= =80=90Chris=E3=80=91: Why = not using the existed TLV to solve the Inter-as use = case?

=E3= =80=90Reply-from Aijun Wang=E3=80=91: For inter-AS use case, using the existed TLV has the = constraints that described in https://mailarchive.ietf.org/arch/msg/lsr/VLufuaGDiRgaflcu58FY_SHn= J7A/

<= o:p> 

=E3= =80=90Chris=E3=80=91: Why = not using prefix attributes to advertise application server=E2=80=99s = information?

=E3= =80=90Reply-from Aijun Wang=E3=80=91: It is possible to advertise these information together = with prefix. But when we want to describe the resources(for example, = link bandwidth, link utilization ratio etc.) to the prefix, it is more = reasonable to associated them to link = attributes.

<= o:p> 

O= n summary, considering the above two use case has the common = characteristic, that is, the associated link is stub-link, we think that = defines the stub-link TLV to contain the these information =C2=A0is more = extensible.

<= o:p> 

=E3= =80=90Acee=E3=80=91: Why = not just advertise the link is the inter-AS boundary or other , and = doesn=E2=80=99t need to infer this conclusion? =

=E3= =80=90Reply-from Aijun Wang=E3=80=91: If necessary, we can add one flag field to indicate = clearly the sub-type of the stub-link. But currently, they are all = passive-interface, has no other distinguished = differences.

T= he usage of such information, or the inferences method, may be different = in different scenario. I think the standardization work should defines = the fundamental common parts.

<= o:p> 

<= o:p> 

B= est Regards

<= o:p> 

A= ijun Wang

C= hina Telecom<= o:p>

<= o:p> 

From: lsr-bounces@ietf.org = <lsr-bounces@ietf.org> On Behalf Of Acee Lindem = (acee)
Sent: Friday, November 20, 2020 6:17 AM
To: = lsr@ietf.org
Subject: [Lsr] IETF I09 LSR Meeting = Minutes

 

I have uploaded the minutes for = the meeting on Monday morning. Thanks much to Yingzhen Qu for taking = them. Please send me any additions or corrections to = me.

 

https://datatr= acker.ietf.org/doc/minutes-109-lsr/

 

Presenters and draft authors, = please note that if more discussion is need on your draft then it is up = to you to initiate such discussion.

 

Thanks,

Acee

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(2048-bit key) header.d=raszuk.net Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id yDlHnQIyUz8U for ; Fri, 20 Nov 2020 00:03:19 -0800 (PST) Received: from mail-lf1-x134.google.com (mail-lf1-x134.google.com [IPv6:2a00:1450:4864:20::134]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 06C273A1045 for ; Fri, 20 Nov 2020 00:03:18 -0800 (PST) Received: by mail-lf1-x134.google.com with SMTP id w142so12157894lff.8 for ; Fri, 20 Nov 2020 00:03:18 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=raszuk.net; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=NsKZUR3d85+JTBXhlj9/h5EEAmb2r+A/OnKP/wXKaFg=; b=GHbnTqbIbWKgWssKEIsklLenGmkpT77Y95GB7i2xdjgJPwg8uW4foakpmyUOABoo0u etLNhj/JmfD6uMk2Iaq4YsZknzBNR41ryyNemZLANPseEiC6VwsiDSfxm+im8u7zqVlt 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ABdhPJxjp7GW4bPHCY0Kk7ESAkAvPgRuxn+It0BNbzPD9db0aumGQuJQWKuFZMy1f/MjOl9c6Eu+kegi9oi0nbnTPdc= X-Received: by 2002:ac2:598f:: with SMTP id w15mr6952187lfn.148.1605859396706; Fri, 20 Nov 2020 00:03:16 -0800 (PST) MIME-Version: 1.0 References: <016b01d6bca9$cf908c20$6eb1a460$@tsinghua.org.cn> <32DFCE3A-D41C-48CA-928A-37011D158AEF@cisco.com> <019901d6bd81$9565b5b0$c0312110$@tsinghua.org.cn> <2C21FE6C-4AC0-4949-ADE0-357DD7E18A87@cisco.com> <00d401d6be1c$f2027f60$d6077e20$@tsinghua.org.cn> In-Reply-To: From: Robert Raszuk Date: Fri, 20 Nov 2020 09:03:06 +0100 Message-ID: To: Gyan Mishra Cc: Aijun Wang , "Acee Lindem (acee)" , lsr Content-Type: multipart/alternative; boundary="000000000000e67ece05b4854664" Archived-At: Subject: Re: [Lsr] Prefix Unreachable Announcement Use Cases X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 20 Nov 2020 08:03:24 -0000 --000000000000e67ece05b4854664 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Gyan, I like and support your use case #1 For use case #2 I have doubts. Imagine indeed an area which get's partitioned such that ABR will loose connectivity to bunch of nodes. Does this mean that now such ABR will be blasting globally perhaps 1000s of PUAs ? How would the ABR be able to send PUA summary provided some disconnected POPs within area could be nicely summarized ? Isn't it better to design your area such that ABRs are interconnected with redundancy ? Thx, R. On Fri, Nov 20, 2020 at 3:28 AM Gyan Mishra wrote: > > Aijun > > I am thinking per the feedback received let=E2=80=99s keep it really simp= le. We > need a solid use case to move the ball forward were the PUA data plane > convergence capabilities can fills a gap that exists today. > > I have two simple solutions to start that I will update the presentation > with to start and present to the WG and we can go from there. > > 1. BGP NH tracking via PUA of NH component prefix to converge the data > plane > > 2. Area partitioned scenario where PUA is used for data plane convergenc= e > to ABR that has reachability to component prefixes. > > I will send out tomorrow. > > Thanks > > Gyan > > On Wed, Nov 18, 2020 at 9:37 PM Aijun Wang > wrote: > >> Hi, Acee: >> >> >> >> OK, we will try to improve this document to meet this criteria. >> >> And, as this topic has been discussed intensely on the mail list, we are >> also eager to invite more interested experts to join us as co-authors to >> refine the solutions for more scenarios. >> >> >> >> Thanks in advance. >> >> >> >> Best Regards >> >> >> >> Aijun Wang >> >> China Telecom >> >> >> >> >> >> *From:* Acee Lindem (acee) >> *Sent:* Thursday, November 19, 2020 12:42 AM >> *To:* Aijun Wang ; 'Robert Raszuk' < >> robert@raszuk.net>; 'Jeff Tantsura' >> *Cc:* 'Gyan Mishra' ; 'lsr' ; 'Acee >> Lindem (acee)' >> *Subject:* Re: [Lsr] Prefix Unreachable Announcement Use Cases >> >> >> >> Speaking as WG Co-Chair: >> >> >> >> *From: *Aijun Wang >> *Date: *Wednesday, November 18, 2020 at 3:05 AM >> *To: *Robert Raszuk , Jeff Tantsura < >> jefftant.ietf@gmail.com> >> *Cc: *'Gyan Mishra' , Acee Lindem , >> 'lsr' , "'Acee Lindem (acee)'" < >> acee=3D40cisco.com@dmarc.ietf.org> >> *Subject: *RE: [Lsr] Prefix Unreachable Announcement Use Cases >> >> >> >> Hi, Robert: >> >> >> >> The trigger and propagation of PUA info can be standardized, the actions >> based on the PUA can be different in different situation. >> >> We can discuss and describe the actions based on different scenarios >> after its WG adoption? >> >> >> >> There will be no adoption call until there is a coherent draft with use >> case(s) and viable actions. >> >> >> >> Thanks, >> >> Acee >> >> >> >> >> >> Best Regards >> >> >> >> Aijun Wang >> >> China Telecom >> >> >> >> *From:* Robert Raszuk >> *Sent:* Wednesday, November 18, 2020 3:49 PM >> *To:* Jeff Tantsura >> *Cc:* Gyan Mishra ; Acee Lindem (acee) < >> acee@cisco.com>; lsr ; Aijun Wang < >> wangaijun@tsinghua.org.cn>; Acee Lindem (acee) < >> acee=3D40cisco.com@dmarc.ietf.org> >> *Subject:* Re: [Lsr] Prefix Unreachable Announcement Use Cases >> >> >> >> Jeff, >> >> >> >> Please notice that WAN is not an IX. >> >> >> >> While you can have full mesh of BFD sessions among all IXP participants >> each bombarding each over over TB fabric every 100 ms or so to map the s= ame >> over global WAN is a different game. If nothing else RTT between IXP >> participants in healthy IX is around 1 ms while RTT between PEs distribu= ted >> globally is often 100-200 ms. >> >> >> >> Just imagine 1000 PEs in 10 areas distributed all over the world. That >> means that in worst case scenario (say same mgmt VPN present on each PE) >> you will establish 1000*999 BFD sessions. Now for this to make sense tim= er >> needs to be 100 ms or so with 3x or 5x multiplier. Anything slower will >> defeat the purpose as BGP withdraw will be faster. >> >> >> >> Then we go into queuing issues. If BFD packets are queued at any >> interface meltdowns may occur which can be far worse in consequences the= n >> waiting for BGP service route removal. Such meltdowns often result in >> cascading effects to the applications itself. >> >> >> >> So this is not at all about autodiscovery with which address to setup th= e >> BFD session. It is much more about operational aspects of going that >> direction. >> >> >> >> With that I am supportive of this work even if we label it as >> experimental for some time. As each network is different what is optimal >> solution for one design and deployment may not be optimal for the other. >> >> >> >> Many thx, >> >> Robert >> >> >> >> >> >> On Wed, Nov 18, 2020 at 4:34 AM Jeff Tantsura >> wrote: >> >> We have been discussing for quite some time and in different wg's (there= =E2=80=99s >> IX with RS use case) BFD verification based on next-hop extraction, Robe= rt >> - you should know. (also built a well working prototype in previous life= ). >> >> Very simple logic: >> >> Upon route import (BGP update received and imported), extract next-hop, >> walk BFD session table, if no match (no existing session) - establish >> (S)BFD session (Discriminators distribution is a solved problem) to the >> next-hop, associate fate of all routes received from it, keep timers >> reasonable to prevent false positives. >> >> State is limited to PE=E2=80=99s importing each others routes (sharing a >> service) only >> High degree of automation >> No IGP pollution >> >> >> >> Cheers, >> >> Jeff >> >> On Nov 17, 2020, 6:43 AM -0800, Acee Lindem (acee) , >> wrote: >> >> Speaking as WG member: >> >> >> >> I think it would be good to hone in on the BGP PE failure convergence us= e >> case as suggested by Robert. It seems there is some interest here althou= gh I >> =E2=80=99m not convinced the IGP is the right place to solve this proble= m. >> >> >> >> Thanks, >> >> Acee >> >> >> >> *From:* Lsr on behalf of Gyan Mishra < >> hayabusagsm@gmail.com> >> *Date:* Tuesday, November 17, 2020 at 4:02 AM >> *To:* Robert Raszuk >> *Cc:* lsr , Jeff Tantsura , Aijun >> Wang , "Acee Lindem (acee)" > 40cisco.com@dmarc.ietf.org> >> *Subject:* Re: [Lsr] Prefix Unreachable Announcement Use Cases >> >> >> >> >> >> >> >> On Tue, Nov 17, 2020 at 3:36 AM Robert Raszuk wrote: >> >> >> >> >> >> Robert, I believe the original intention was related to having the >> data plane converge quickly when summarization is used and flip so traff= ic >> converges from the Active ABR to the Backup ABR. >> >> >> >> I do not buy this use case. Flooding within the area is fast such that >> both ABRs will get the same info. As mentioned before there is no practi= cal >> use of PUA for making any routing or fwd decision on which ABR to use. I= f >> your ABRs are not connected with min redundancy this draft is a worst pa= tch >> ever to work around such a design. >> >> >> >> Gyan> Agreed. The point of PUA in ABR use case is the ability to >> track the component prefixes and in case where component is down and >> traffic is still forwarded to the ABR and dropped. The other more >> important use case is when links are down within the area and the area i= s >> partitioned and so one ABR has all component prefixes however other ABR = is >> missing half the component prefixes. So since the ABR will by default >> advertise the summary as long as their is one component UP the summary i= s >> still advertised. So this use case is severely impacting as now you hav= e >> an ECMP path to the other area for the summary via the two ABRs and you >> drop half your traffic. So now with PUA the problem is fixed and the PU= A >> is sent and now traffic is only sent to the ABR that has the component >> prefixes. >> >> >> >> Please present us a picture indicating before and after ABRs behaviour. >> >> >> >> Gyan> will do >> >> >> >> However PUA can be used in the absence of area segmentation within a >> single area when a link or node fails to converge the data plane quickly= by >> sending PUA for the backup path so the active path. >> >> >> >> If there is no area segmentation then there is no summaries. So what are >> we missing in the first place ? >> >> >> >> Gyan> Sorry I am stating that PUA feature can also be used intra are= a >> where if a link or node goes down to improve data plane convergence. >> >> >> >> >> >> With the IGP tuned with BFD fast detection on ISIS or OSPF links and LFA >> & RLFA for MPLS or TI-LFA for SR local protection - with those tweaks th= e >> convergence is well into sub second. So for Intra area convergence with >> all the optimizations mentioned I am not sure how much faster the data >> plane will converge with PUA. >> >> >> >> Even without any of the above listed chain of acronymous things will >> generally work well intra-area without PUAs. >> >> >> >> Gyan> Agreed which is why I mentioned the BGP next hop self use case >> if I could figure out how PUA could help there that would be a major >> benefit of PUA. >> >> >> >> Thx, >> R. >> >> >> >> >> >> -- >> >> <> >> >> *Gyan Mishra* >> >> *Network Solutions Architect * >> >> >> >> *M 301 502-134713101 Columbia Pike >> *Silver >> Spring, MD >> >> >> >> >> -- > > > > *Gyan Mishra* > > *Network Solutions A**rchitect * > > > > *M 301 502-134713101 Columbia Pike *Silver Spring, MD > > --000000000000e67ece05b4854664 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Gyan,

I like and support your use case = #1=C2=A0

For use case #2 I have doubts. Imagine in= deed an area which get's partitioned such that ABR will loose connectiv= ity to bunch of nodes. Does this mean that now such ABR will be blasting gl= obally perhaps 1000s of PUAs ? How would the ABR be able to send PUA summar= y provided some disconnected POPs within area could be nicely summarized ? = Isn't it better to design your area such that ABRs are interconnected w= ith redundancy ?=C2=A0

Thx,
R.



On Fri, Nov 20, 2020 at 3:28 AM Gyan Mishra <hayabusagsm@gmail.com> wrote:
<= /div>

Aijun=C2=A0

I am thinking per the feedback received let=E2=80=99s keep it really simpl= e.=C2=A0 We need a solid use case to move the ball forward were the PUA dat= a plane convergence capabilities can fills a gap that exists today.=C2=A0

I have two simple solutio= ns to start that I will update the presentation with to start and present t= o the WG and we can go from there.

1.=C2=A0 BGP NH tracking via PUA of NH component prefix to conve= rge the data plane

2.=C2= =A0 Area partitioned scenario where PUA is used for data plane convergence = to ABR that has reachability to component prefixes. =C2=A0

I will send out tomorrow.

Thanks=C2=A0
<= br>
Gyan

On Wed, Nov 18, 2020 at 9:37 PM Aijun W= ang <wang= aijun@tsinghua.org.cn> wrote:

Hi, Acee:

=C2=A0

OK, we will try to improve this document to= meet this criteria.

And, as this topic has been discussed intensely on the m= ail list, we are also eager to invite more interested experts to join us as= co-authors to refine the solutions for more scenarios.

=C2=A0

Thanks in advance.=

=C2=A0

Best R= egards

=C2=A0

Aijun = Wang

China Telecom

<= u>=C2=A0

=C2=A0

From= : Acee Lindem (acee) <acee@cisco.com>
Sent: Thursday, November 1= 9, 2020 12:42 AM
To: Aijun Wang <wangaijun@tsinghua.org.cn>; 'R= obert Raszuk' <robert@raszuk.net>; 'Jeff Tantsura' <jefftant.ietf@gmail.com><= br>Cc: 'Gyan Mishra' <hayabusagsm@gmail.com>; 'lsr' <lsr@ietf.org>; '= Acee Lindem (acee)' <acee=3D40cisco.com@dmarc.ietf.org>
Subject: Re: [Lsr] Prefix Unreachable Announcement Use Cases=

=C2=A0

Speaking as WG Co-Chair:

=C2=A0

= From: Aijun Wang <= wangaijun@ts= inghua.org.cn>
Date: Wednesday, November 18, 2020 at 3:05 = AM
To: Robert Raszuk <robert@raszuk.net>, Jeff Tantsura <jefftant.ietf@gmail.com&g= t;
Cc: 'Gyan Mishra' <hayabusagsm@gmail.com>, Acee Lindem <<= a href=3D"mailto:acee@cisco.com" target=3D"_blank">acee@cisco.com>, = 'lsr' <lsr@iet= f.org>, "'Acee Lindem (acee)'" <acee=3D40cisco.com@= dmarc.ietf.org>
Subject: RE: [Lsr] Prefix Unreachable Anno= uncement Use Cases

= =C2=A0

Hi, Robert:

=C2=A0

The trigger and propagation of PUA info can be standardized,= the actions based on the PUA can be different in different situation.

We can discuss and describ= e the actions based on different scenarios after its WG adoption?

=C2=A0

There will be no adoption call until there is a coherent draft w= ith use case(s) and viable actions.

=C2=A0

Thanks,<= /p>

Acee

=C2=A0

=C2=A0<= /span>

Best= Regards

=C2=A0

Aijun Wang

China Telecom

=C2=A0

From: Robert = Raszuk <robert@ra= szuk.net>
Sent: Wednesday, November 18, 2020 3:49 PM
<= b>To: Jeff Tantsura <jefftant.ietf@gmail.com>
Cc: Gyan Mishra <= ;hayabusagsm@gma= il.com>; Acee Lindem (acee) <acee@cisco.com>; lsr <lsr@ietf.org>; Aijun Wang <wangaijun@tsinghua.org.cn>; Acee Lindem (acee) <acee=3D40cisco.com@dmarc.ietf.org>
= Subject: Re: [Lsr] Prefix Unreachable Announcement Use Cases

=C2=A0

<= p class=3D"MsoNormal" style=3D"margin-left:78pt">Jeff,=

=C2=A0

Please noti= ce that WAN is not an IX.=C2=A0

=C2=A0

While you can have full mesh of BFD sessions amon= g all IXP participants each bombarding each over over TB fabric every 100 m= s or so to map the same over global WAN is a different game. If nothing els= e RTT between IXP participants in healthy IX is around 1 ms while RTT betwe= en PEs distributed globally is often 100-200 ms.=C2=A0=

=C2=A0

Just imagine 1000 PEs in 1= 0 areas distributed all over the world. That means that in worst case scena= rio (say same mgmt VPN present on each PE) you will establish 1000*999 BFD = sessions. Now for this to make sense timer needs to be 100 ms or so with 3x= or 5x multiplier. Anything slower will defeat the purpose as BGP withdraw = will be faster.=C2=A0

=C2=A0

Then we go into queuing issues. If BFD packets are queued a= t any interface meltdowns may occur which can be far worse in consequences = then waiting for BGP service route removal. Such meltdowns often result in = cascading effects to the applications itself.=C2=A0

=C2=A0

So this is not at all about a= utodiscovery with which address to setup=C2=A0the BFD session. It is much m= ore about operational aspects of going that direction.=C2=A0<= /span>

=C2=A0

With that I am suppo= rtive of this work even if we label it as experimental for some time. As ea= ch network is different what is optimal solution for one design and deploym= ent may not be optimal for the other.=C2=A0

<= div>

= =C2=A0

Many thx,

Robert

=C2=A0

<= /div>

=C2=A0

On Wed, Nov 18, 2020 at 4:34 AM= Jeff Tantsura <jefftant.ietf@gmail.com> wrote:

<= blockquote style=3D"border-top:none;border-right:none;border-bottom:none;bo= rder-left:1pt solid rgb(204,204,204);padding:0cm 0cm 0cm 6pt;margin:5pt 0cm= 5pt 4.8pt">

We have been discussing = for quite some time and in different wg's (there=E2=80=99s IX with RS use case) BFD verification based on next-hop ext= raction, Robert - you should know. (also built a well working prototype in = previous life).=C2=A0

Very simple logic:

Upon route import (B= GP update received and imported), extract next-hop, walk BFD session table,= if no match (no existing session) - establish (S)BFD session (Discriminato= rs distribution is a solved problem) to the next-hop, associate fate of all= routes received from it, keep timers reasonable to prevent false positives= .

State is limited to PE=E2=80=99s impor= ting each others routes (sharing a service) only
High degree of automati= on
No IGP pollution=C2=A0

=C2=A0

Cheers, =

Jeff

On Nov 17, 2020, 6:43= AM -0800, Acee Lindem (acee) <acee@cisco.com>, wrote:

=

Speaking as WG member:

=C2=A0

I think it would be good to hone in on the = BGP PE failure convergence use case as suggested by Robert. It seems there = is some interest here although I=E2=80=99m not = convinced the IGP is the right place to solve this problem.

=C2=A0

Thanks,

Acee<= /u>

=C2=A0

From: Lsr <lsr-bounces@ietf.org> on behalf of Gyan Mishr= a <hayabusags= m@gmail.com>
Date: Tuesday, November 17, 2020 at 4:02 AMTo: Robert Raszuk <robert@raszuk.net>
Cc: lsr <lsr@ietf.org>, Jeff Tantsura <= jefftant.ietf@= gmail.com>, Aijun Wang <wangaijun@tsinghua.org.cn>, "Acee Lindem = (acee)" <acee=3D40cisco.com@dmarc.ietf.org>
Subject: Re: [Lsr= ] Prefix Unreachable Announcement Use Cases

=

=C2=A0

=C2=A0<= /p>

=C2=A0

On Tue, Nov 17, 2020 at 3:= 36 AM Robert Raszuk <robert@raszuk.net> wrote:

=C2=A0

=C2=A0

=C2=A0 =C2=A0Robert, I believe = the original intention was related to having the data plane converge quickl= y when summarization is used and flip so traffic converges from the Active = ABR to the Backup ABR.=C2=A0

=C2=A0

I do not buy this use cas= e. Flooding within the area is fast such that both ABRs will get the same i= nfo. As mentioned before there is no practical use of PUA for making any ro= uting or fwd decision on which ABR to use. If your ABRs are not connected w= ith min redundancy this draft is a worst patch ever to work around such a d= esign.=C2=A0

=C2= =A0

=C2=A0 =C2=A0Gyan> Agreed.=C2=A0 The= point of PUA in ABR use case is the ability to track the component prefixe= s and in case where component is down and traffic is still forwarded to the= ABR and dropped.=C2=A0 The other more important use case is when links are= down within the area and the area is partitioned and so one ABR has all co= mponent prefixes however other ABR is missing half the component prefixes.= =C2=A0 So since the ABR will by default advertise the summary as long as th= eir is one component UP the summary is still advertised.=C2=A0 So this use = case is severely impacting as now you have an ECMP path to the other area f= or the summary via the two ABRs and you drop half your traffic.=C2=A0 So no= w with PUA the problem is fixed and the PUA is sent and now traffic is only= sent to the ABR that has the component prefixes.

<= /div>

=C2=A0

Please= present us a picture indicating before and after ABRs behaviour.=C2=A0<= /u>

=C2=A0<= /span>

=C2=A0 =C2=A0 =C2=A0Gyan> will do=C2=A0<= /span>

=C2=A0

=C2=A0 =C2=A0However PUA can be used in the abs= ence of area segmentation within a single area when a link or node fails to= converge the data plane quickly by sending PUA for the backup path so the = active path.=C2=A0

<= div>

=C2=A0

If there is no area segmentation th= en there is no summaries. So what are we missing in the first place ?=C2=A0=

=C2=A0<= /u>

=C2=A0 =C2=A0 Gyan> Sorry I am stating that PUA fe= ature can also be used intra area where if a link or node goes down to impr= ove data plane convergence.

=C2=A0

=C2=A0<= /p>

With the IGP tuned with BFD fast detectio= n on ISIS or OSPF links and LFA & RLFA for MPLS or TI-LFA for SR local = protection - with those tweaks the convergence is well into sub second.=C2= =A0 So for Intra area convergence with all the optimizations mentioned I am= not sure how much faster the data plane will converge with PUA.<= /u>

=C2=A0<= /p>

Even without any of the above listed chain of acronymous things = will generally work well intra-area without PUAs.=C2=A0

=C2=A0

=

=C2=A0 =C2=A0 Gyan> Agreed which is why I mentioned the BGP next hop s= elf use case if I could figure out how PUA could help there that would be a= major benefit of PUA.

=C2=A0

Thx,
R.=

=C2=A0

=C2=A0

--

<= div>

= <>

Gyan Mishra

Network Solutions Architect=C2=A0

M 301 502-1347
13101 Columbia Pike=C2=A0
Silver Spring, MD

=C2=A0

Hi, = Acee:

 

-----Original Message-----
From: lsr-bounces@ietf.org = <lsr-bounces@ietf.org> On Behalf Of Acee Lindem (acee)
Sent: = Wednesday, November 18, 2020 2:47 AM
To: Aijun Wang = <wangaj3@chinatelecom.cn>
Cc: 'lsr' = <lsr@ietf.org>
Subject: Re: [Lsr] New Version Notification for = draft-wang-lsr-passive-interface-attribute-06.txt

 

Speaking as WG member and = longtime steward=C2=A0 of the IGPs:

 

Hi Aijun, =

 

My opinion is that we should not overload the base IGP = topology advertisements with everyone's favorite obscure use case. = Hence, I think it would be a big mistake to add this stub link TLV to = the base LSAs.

[WAJ] Putting the information in = other regular TLVs, or putting them in LSA of one independent IGP = instance(as you proposed in 109 meeting) will be more expensive. Do you = agree this statement?

 

Rather, exactly what problem are = you trying to solve? Previously, you were trying to associate the = passive interface attribute with a prefix and making some inference = related to an inter-AS boundary (this was not entirely clear). What = problem are you trying to solve? Precisely, what do you want the = controller to learn (i.e., address or interface index) and what is it = going to do with it.

[WAJ] Passive Interfaces are already deployed = within the network in many places, as stated in the draft-wang-lsr-passive-interface-attribute-= 06#section-1. What we want to know, is the position of passive = interface. Previously, we want piggyback such information within its = associated prefix, but after discussion on the mail list, define one new = TLV to contain it and other future information may be more acceptable = and extensible.

Knowing these information, the controller can = learn the inter-as links via some methods that we have discussed in = another thread, can know the boundary of network, can learn the link = characteristic that associated with server etc. We have also mentioned = it in the draft-wang-lsr-passive-interface-attribute-= 06#section-1 and think it is not appropriate to expand it = intensely in one LSR draft.

 

Please don't try and solve the = CFN problem as the requirements are not clear (anycast, unicast, impact = on routing, scope, etc).

[WAJ] In your 109 meeting presentation slides-109-lsr-5-ospf-transport-instance-0= 0, you mentioned also the similar information that should be = transferred via the OSPF protocol. I think this is the direction and we = can prepare for it in advance. Putting such non-routing information in = one independent TLV can certainly keep the stability of IGP protocol. =

 

 

 

Thanks,

Acee

 

=EF=BB=BFOn 11/17/20, 1:08 AM, "wangaj3@chinatelecom.cn = on behalf of Aijun Wang" <wangaj3@chinatelecom.cn> wrote:

 

=C2=A0=C2=A0=C2=A0 Hi, Acee:

 

=C2=A0=C2=A0=C2=A0 As discussed = on the list and during the 109 meeting, we have updated the draft to = reflect the comments from the LSR community.

=C2=A0=C2=A0=C2=A0 Please see = whether you have still other concerns or not and if there is no further = comments on this direction, can we begin the WG adoption call = then?

=C2=A0=C2=A0=C2=A0 Thanks you and Peter for your intense = discussions for this draft.

 

=C2=A0=C2=A0=C2=A0 Thanks in = advance.

 

=C2=A0=C2=A0=C2=A0 Best Regards

 

=C2=A0=C2=A0=C2=A0 Aijun = Wang

=C2=A0=C2=A0=C2=A0 China Telecom

 

=C2=A0=C2=A0=C2=A0 > = -----Original Message-----

=C2=A0=C2=A0=C2=A0 > From: internet-drafts@ietf.org<= /span> <internet-drafts@ietf.org<= /span>>

=C2=A0=C2=A0=C2=A0 > Sent: Sunday, November 15, 2020 = 7:44 AM

=C2=A0=C2=A0=C2=A0 > To: Zhibo Hu <huzhibo@huawei.com= >; Aijun Wang

=C2=A0=C2=A0=C2=A0 > <wangaj3@chinatelecom.cn>; Gyan S. Mishra <gyan.s.mishra@verizon.com= >;

=C2=A0=C2=A0=C2=A0 > Gyan Mishra <gyan.s.mishra@verizon.com= >

=C2=A0=C2=A0=C2=A0 > Subject: New Version Notification = for

=C2=A0=C2=A0=C2=A0 > = draft-wang-lsr-passive-interface-attribute-06.txt

=C2=A0=C2=A0=C2=A0 > =

=C2=A0=C2=A0=C2=A0=C2=A0>

=C2=A0=C2=A0=C2=A0=C2=A0> A = new version of I-D, = draft-wang-lsr-passive-interface-attribute-06.txt

=C2=A0=C2=A0=C2=A0 > has = been successfully submitted by Aijun Wang and posted to the = IETF

=C2=A0=C2=A0=C2=A0 > repository.

=C2=A0=C2=A0=C2=A0 > =

=C2=A0=C2=A0=C2=A0=C2=A0> = Name:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 = draft-wang-lsr-passive-interface-attribute

=C2=A0=C2=A0=C2=A0 > = Revision:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 06

=C2=A0=C2=A0=C2=A0 > = Title:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0 Passive Interface Attribute

=C2=A0=C2=A0=C2=A0 > Document = date:=C2=A0=C2=A0 2020-11-15

=C2=A0=C2=A0=C2=A0 > = Group:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Individual = Submission

=C2=A0=C2=A0=C2=A0 > = Pages:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 = 10

=C2=A0=C2=A0=C2=A0 > URL:

=C2=A0=C2=A0=C2=A0 > https://www.ietf.org/arch= ive/id/draft-wang-lsr-passive-interface-attribute-06.t

=C2=A0=C2=A0=C2=A0 > xt

=C2=A0=C2=A0=C2=A0 > = Status:

=C2=A0=C2=A0=C2=A0 > https://datatracker.ietf.= org/doc/draft-wang-lsr-passive-interface-attribute/=

=C2=A0=C2=A0=C2=A0 = > Htmlized:

=C2=A0=C2=A0=C2=A0 > https://datatracker.ietf.= org/doc/html/draft-wang-lsr-passive-interface-attribut

=C2=A0=C2=A0=C2=A0 > e

=C2=A0=C2=A0=C2=A0 > = Htmlized:

=C2=A0=C2=A0=C2=A0 > https://tools.ietf.org/ht= ml/draft-wang-lsr-passive-interface-attribute-06

=C2=A0=C2=A0=C2=A0 = > Diff:

=C2=A0=C2=A0=C2=A0 > https://www.ietf.org/rfcd= iff?url2=3Ddraft-wang-lsr-passive-interface-attribute-06<= /o:p>

=C2=A0=C2=A0=C2=A0 >

=C2=A0=C2=A0=C2=A0=C2=A0> = Abstract:

=C2=A0=C2=A0=C2=A0 >=C2=A0=C2=A0=C2=A0 This document = describes the mechanism that can be used to

=C2=A0=C2=A0=C2=A0 = >=C2=A0=C2=A0=C2=A0 differentiate the passive interfaces from the = normal interfaces

=C2=A0=C2=A0=C2=A0 >=C2=A0=C2=A0=C2=A0 within ISIS or = OSPF domain.

=C2=A0=C2=A0=C2=A0 >

=C2=A0=C2=A0=C2=A0=C2=A0> =

=C2=A0=C2=A0=C2=A0=C2=A0>

=C2=A0=C2=A0=C2=A0=C2=A0> =

=C2=A0=C2=A0=C2=A0=C2=A0> Please note that it may take a = couple of minutes from the time of submission

=C2=A0=C2=A0=C2=A0 > until = the htmlized version and diff are available at = tools.ietf.org.

=C2=A0=C2=A0=C2=A0 >

=C2=A0=C2=A0=C2=A0=C2=A0> The = IETF Secretariat

=C2=A0=C2=A0=C2=A0 >

 

 

 

_______________________________________________

Lsr mailing = list

Lsr@ietf.org

https://www.ietf.org/mail= man/listinfo/lsr

--


Gyan Mishra

Network Solutions Architect=C2=A0

M 301 502-1347
13101 Columbia Pike=C2=A0
<= /font>Silver Spring, MD


--000000000000e67ece05b4854664-- From nobody Fri Nov 20 00:43:12 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id EDAE73A1A68 for ; Fri, 20 Nov 2020 00:43:10 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.087 X-Spam-Level: X-Spam-Status: No, score=-2.087 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_REMOTE_IMAGE=0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id mLJNCzzMTY-b for ; Fri, 20 Nov 2020 00:43:06 -0800 (PST) Received: from mail-pg1-x529.google.com (mail-pg1-x529.google.com [IPv6:2607:f8b0:4864:20::529]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 73DAB3A1A9A for ; Fri, 20 Nov 2020 00:43:06 -0800 (PST) Received: by mail-pg1-x529.google.com with SMTP id m9so6727927pgb.4 for ; Fri, 20 Nov 2020 00:43:06 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=6XUcRix3Q0FhaCp+yJoqMfWnWn88dFoVVAyK/wFqvsU=; b=jUf+rnvbVPcRgjQSzJAhdi0w4H2IybLukWMXMhcfPoaixvO2SIzQdP3WAsJFFp7WRs yYVU3FVhOMfBjo7+cpZuN+uBAtd1nBhJzrbjQwLgxL72dBVrWtpZj6IwXdCyMFCbYhl7 3vYYuPNo6+2USY5hPqMGizlZNASAUvpTH2wMtBwhYr8Jj6DA3bbwWHHT9A+zsQDkpF4i JWs2a38MRKkNDSqzeYy3AhBVNLMqTZ278tcAos7O15BRSyYCznRUiqN9Fqh6vJsqs76h jO5wNrKWH6Sh4gE25uPgwSoY/xn1WlPaQ08yDoaL/9A92PvL9OkmcriU9EjPXsfGOVGp C7bw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=6XUcRix3Q0FhaCp+yJoqMfWnWn88dFoVVAyK/wFqvsU=; b=Tww2vNeUbrEd1gbbdohNjteU/1PLgLiwxhRBaw+OxOSvnLrN5b15LEZVStWgKYX8X7 ND9Bb6SovKz6HnpjlJjF304kC+Tlhed61X9l2ns74yJwjZIAKlnQO0A2tq5z0sGTgudZ q9qy+Dyz6Ksr5VNAf5cjh/cuwF3zTGRF9F5g/gh5fY4qRejKtItCPRPzsY4LwPzevBXC ngiCbPeiAcWiejaBiJ/E9ZrRmXyT1uztUUnI6iy0ysfJydiFJ+UMAoflzv68No1qBx0+ FfimL06o+klkkt3gjxH5jUYG+GXSCmUasjUT3HKoDfDcwL6WzoR/vX5/kf275BowhTd/ nZ7w== X-Gm-Message-State: AOAM533kPXAHm1GiTAg8nJmyM69ZDClZDdB453Ts151BDujfbtoX/kkc 12gAjPPUr8VxXWX0dKEYD8InCEbCQzWGiZxWT68= X-Google-Smtp-Source: ABdhPJwwmHRazbwdA31ZcWDYAaK0zYA9sY5v29KxJLbXh3HIUt8DkOrtO9zo9uBOSw6PMF4FrSheJH6BiacpNgKOHzc= X-Received: by 2002:a65:4241:: with SMTP id d1mr15637498pgq.18.1605861785821; Fri, 20 Nov 2020 00:43:05 -0800 (PST) MIME-Version: 1.0 References: <016b01d6bca9$cf908c20$6eb1a460$@tsinghua.org.cn> <32DFCE3A-D41C-48CA-928A-37011D158AEF@cisco.com> <019901d6bd81$9565b5b0$c0312110$@tsinghua.org.cn> <2C21FE6C-4AC0-4949-ADE0-357DD7E18A87@cisco.com> <00d401d6be1c$f2027f60$d6077e20$@tsinghua.org.cn> In-Reply-To: From: Gyan Mishra Date: Fri, 20 Nov 2020 03:42:54 -0500 Message-ID: To: Robert Raszuk Cc: "Acee Lindem (acee)" , Aijun Wang , lsr Content-Type: multipart/alternative; boundary="0000000000004d64d305b485d565" Archived-At: Subject: Re: [Lsr] Prefix Unreachable Announcement Use Cases X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 20 Nov 2020 08:43:11 -0000 --0000000000004d64d305b485d565 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Robert Let me send it over graphical depiction as a picture is worth a thousand words should be easy to see the concept. Trying to keep as simple as possible. Thanks Gyan On Fri, Nov 20, 2020 at 3:03 AM Robert Raszuk wrote: > Gyan, > > I like and support your use case #1 > > For use case #2 I have doubts. Imagine indeed an area which get's > partitioned such that ABR will loose connectivity to bunch of nodes. Does > this mean that now such ABR will be blasting globally perhaps 1000s of PU= As > ? How would the ABR be able to send PUA summary provided some disconnecte= d > POPs within area could be nicely summarized ? Isn't it better to design > your area such that ABRs are interconnected with redundancy ? > > Thx, > R. > > > > On Fri, Nov 20, 2020 at 3:28 AM Gyan Mishra wrote= : > >> >> Aijun >> >> I am thinking per the feedback received let=E2=80=99s keep it really sim= ple. We >> need a solid use case to move the ball forward were the PUA data plane >> convergence capabilities can fills a gap that exists today. >> >> I have two simple solutions to start that I will update the presentation >> with to start and present to the WG and we can go from there. >> >> 1. BGP NH tracking via PUA of NH component prefix to converge the data >> plane >> >> 2. Area partitioned scenario where PUA is used for data plane >> convergence to ABR that has reachability to component prefixes. >> >> I will send out tomorrow. >> >> Thanks >> >> Gyan >> >> On Wed, Nov 18, 2020 at 9:37 PM Aijun Wang >> wrote: >> >>> Hi, Acee: >>> >>> >>> >>> OK, we will try to improve this document to meet this criteria. >>> >>> And, as this topic has been discussed intensely on the mail list, we ar= e >>> also eager to invite more interested experts to join us as co-authors t= o >>> refine the solutions for more scenarios. >>> >>> >>> >>> Thanks in advance. >>> >>> >>> >>> Best Regards >>> >>> >>> >>> Aijun Wang >>> >>> China Telecom >>> >>> >>> >>> >>> >>> *From:* Acee Lindem (acee) >>> *Sent:* Thursday, November 19, 2020 12:42 AM >>> *To:* Aijun Wang ; 'Robert Raszuk' < >>> robert@raszuk.net>; 'Jeff Tantsura' >>> *Cc:* 'Gyan Mishra' ; 'lsr' ; >>> 'Acee Lindem (acee)' >>> *Subject:* Re: [Lsr] Prefix Unreachable Announcement Use Cases >>> >>> >>> >>> Speaking as WG Co-Chair: >>> >>> >>> >>> *From: *Aijun Wang >>> *Date: *Wednesday, November 18, 2020 at 3:05 AM >>> *To: *Robert Raszuk , Jeff Tantsura < >>> jefftant.ietf@gmail.com> >>> *Cc: *'Gyan Mishra' , Acee Lindem , >>> 'lsr' , "'Acee Lindem (acee)'" < >>> acee=3D40cisco.com@dmarc.ietf.org> >>> *Subject: *RE: [Lsr] Prefix Unreachable Announcement Use Cases >>> >>> >>> >>> Hi, Robert: >>> >>> >>> >>> The trigger and propagation of PUA info can be standardized, the action= s >>> based on the PUA can be different in different situation. >>> >>> We can discuss and describe the actions based on different scenarios >>> after its WG adoption? >>> >>> >>> >>> There will be no adoption call until there is a coherent draft with use >>> case(s) and viable actions. >>> >>> >>> >>> Thanks, >>> >>> Acee >>> >>> >>> >>> >>> >>> Best Regards >>> >>> >>> >>> Aijun Wang >>> >>> China Telecom >>> >>> >>> >>> *From:* Robert Raszuk >>> *Sent:* Wednesday, November 18, 2020 3:49 PM >>> *To:* Jeff Tantsura >>> *Cc:* Gyan Mishra ; Acee Lindem (acee) < >>> acee@cisco.com>; lsr ; Aijun Wang < >>> wangaijun@tsinghua.org.cn>; Acee Lindem (acee) < >>> acee=3D40cisco.com@dmarc.ietf.org> >>> *Subject:* Re: [Lsr] Prefix Unreachable Announcement Use Cases >>> >>> >>> >>> Jeff, >>> >>> >>> >>> Please notice that WAN is not an IX. >>> >>> >>> >>> While you can have full mesh of BFD sessions among all IXP participants >>> each bombarding each over over TB fabric every 100 ms or so to map the = same >>> over global WAN is a different game. If nothing else RTT between IXP >>> participants in healthy IX is around 1 ms while RTT between PEs distrib= uted >>> globally is often 100-200 ms. >>> >>> >>> >>> Just imagine 1000 PEs in 10 areas distributed all over the world. That >>> means that in worst case scenario (say same mgmt VPN present on each PE= ) >>> you will establish 1000*999 BFD sessions. Now for this to make sense ti= mer >>> needs to be 100 ms or so with 3x or 5x multiplier. Anything slower will >>> defeat the purpose as BGP withdraw will be faster. >>> >>> >>> >>> Then we go into queuing issues. If BFD packets are queued at any >>> interface meltdowns may occur which can be far worse in consequences th= en >>> waiting for BGP service route removal. Such meltdowns often result in >>> cascading effects to the applications itself. >>> >>> >>> >>> So this is not at all about autodiscovery with which address to >>> setup the BFD session. It is much more about operational aspects of goi= ng >>> that direction. >>> >>> >>> >>> With that I am supportive of this work even if we label it as >>> experimental for some time. As each network is different what is optima= l >>> solution for one design and deployment may not be optimal for the other= . >>> >>> >>> >>> Many thx, >>> >>> Robert >>> >>> >>> >>> >>> >>> On Wed, Nov 18, 2020 at 4:34 AM Jeff Tantsura >>> wrote: >>> >>> We have been discussing for quite some time and in different wg's (ther= e >>> =E2=80=99s IX with RS use case) BFD verification based on next-hop extr= action, >>> Robert - you should know. (also built a well working prototype in previ= ous >>> life). >>> >>> Very simple logic: >>> >>> Upon route import (BGP update received and imported), extract next-hop, >>> walk BFD session table, if no match (no existing session) - establish >>> (S)BFD session (Discriminators distribution is a solved problem) to the >>> next-hop, associate fate of all routes received from it, keep timers >>> reasonable to prevent false positives. >>> >>> State is limited to PE=E2=80=99s importing each others routes (sharing = a >>> service) only >>> High degree of automation >>> No IGP pollution >>> >>> >>> >>> Cheers, >>> >>> Jeff >>> >>> On Nov 17, 2020, 6:43 AM -0800, Acee Lindem (acee) , >>> wrote: >>> >>> Speaking as WG member: >>> >>> >>> >>> I think it would be good to hone in on the BGP PE failure convergence >>> use case as suggested by Robert. It seems there is some interest here >>> although I=E2=80=99m not convinced the IGP is the right place to solve = this >>> problem. >>> >>> >>> >>> Thanks, >>> >>> Acee >>> >>> >>> >>> *From:* Lsr on behalf of Gyan Mishra < >>> hayabusagsm@gmail.com> >>> *Date:* Tuesday, November 17, 2020 at 4:02 AM >>> *To:* Robert Raszuk >>> *Cc:* lsr , Jeff Tantsura , >>> Aijun Wang , "Acee Lindem (acee)" >> 40cisco.com@dmarc.ietf.org> >>> *Subject:* Re: [Lsr] Prefix Unreachable Announcement Use Cases >>> >>> >>> >>> >>> >>> >>> >>> On Tue, Nov 17, 2020 at 3:36 AM Robert Raszuk wrote= : >>> >>> >>> >>> >>> >>> Robert, I believe the original intention was related to having the >>> data plane converge quickly when summarization is used and flip so traf= fic >>> converges from the Active ABR to the Backup ABR. >>> >>> >>> >>> I do not buy this use case. Flooding within the area is fast such that >>> both ABRs will get the same info. As mentioned before there is no pract= ical >>> use of PUA for making any routing or fwd decision on which ABR to use. = If >>> your ABRs are not connected with min redundancy this draft is a worst p= atch >>> ever to work around such a design. >>> >>> >>> >>> Gyan> Agreed. The point of PUA in ABR use case is the ability to >>> track the component prefixes and in case where component is down and >>> traffic is still forwarded to the ABR and dropped. The other more >>> important use case is when links are down within the area and the area = is >>> partitioned and so one ABR has all component prefixes however other ABR= is >>> missing half the component prefixes. So since the ABR will by default >>> advertise the summary as long as their is one component UP the summary = is >>> still advertised. So this use case is severely impacting as now you ha= ve >>> an ECMP path to the other area for the summary via the two ABRs and you >>> drop half your traffic. So now with PUA the problem is fixed and the P= UA >>> is sent and now traffic is only sent to the ABR that has the component >>> prefixes. >>> >>> >>> >>> Please present us a picture indicating before and after ABRs behaviour. >>> >>> >>> >>> Gyan> will do >>> >>> >>> >>> However PUA can be used in the absence of area segmentation within a >>> single area when a link or node fails to converge the data plane quickl= y by >>> sending PUA for the backup path so the active path. >>> >>> >>> >>> If there is no area segmentation then there is no summaries. So what ar= e >>> we missing in the first place ? >>> >>> >>> >>> Gyan> Sorry I am stating that PUA feature can also be used intra >>> area where if a link or node goes down to improve data plane convergenc= e. >>> >>> >>> >>> >>> >>> With the IGP tuned with BFD fast detection on ISIS or OSPF links and LF= A >>> & RLFA for MPLS or TI-LFA for SR local protection - with those tweaks t= he >>> convergence is well into sub second. So for Intra area convergence wit= h >>> all the optimizations mentioned I am not sure how much faster the data >>> plane will converge with PUA. >>> >>> >>> >>> Even without any of the above listed chain of acronymous things will >>> generally work well intra-area without PUAs. >>> >>> >>> >>> Gyan> Agreed which is why I mentioned the BGP next hop self use cas= e >>> if I could figure out how PUA could help there that would be a major >>> benefit of PUA. >>> >>> >>> >>> Thx, >>> R. >>> >>> >>> >>> >>> >>> -- >>> >>> <> >>> >>> *Gyan Mishra* >>> >>> *Network Solutions Architect * >>> >>> >>> >>> *M 301 502-134713101 Columbia Pike >>> >>> *Silver >>> Spring, MD >>> >>> >>> >>> >>> -- >> >> >> >> *Gyan Mishra* >> >> *Network Solutions A**rchitect * >> >> >> >> *M 301 502-134713101 Columbia Pike >> *Silver >> Spring, MD >> >> >> -- *Gyan Mishra* *Network Solutions A**rchitect * *M 301 502-134713101 Columbia Pike *Silver Spring, MD --0000000000004d64d305b485d565 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Robert=C2=A0

Let me send it over graphical depiction as a picture is worth a thou= sand words should be easy to see the concept.

Trying to keep as simple as possible.

Thanks=C2=A0
<= br>
Gyan

On Fri, Nov 20, 2020 at 3:03 AM Robert = Raszuk <robert@raszuk.net> w= rote:
Gyan,
I like and support your use case #1=C2=A0

=
For use case #2 I have doubts. Imagine indeed an area which get's = partitioned such that ABR will loose connectivity to bunch of nodes. Does t= his mean that now such ABR will be blasting globally perhaps 1000s of PUAs = ? How would the ABR be able to send PUA summary provided some disconnected = POPs within area could be nicely summarized ? Isn't it better to design= your area such that ABRs are interconnected with redundancy ?=C2=A0
<= div>
Thx,
R.



=
On Fri, No= v 20, 2020 at 3:28 AM Gyan Mishra <hayabusagsm@gmail.com> wrote:

Aijun=C2=A0

I am thinki= ng per the feedback received let=E2=80=99s keep it really simple.=C2=A0 We = need a solid use case to move the ball forward were the PUA data plane conv= ergence capabilities can fills a gap that exists today.=C2=A0

I have two simple solutions to start = that I will update the presentation with to start and present to the WG and= we can go from there.

1= .=C2=A0 BGP NH tracking via PUA of NH component prefix to converge the data= plane

2.=C2=A0 Area par= titioned scenario where PUA is used for data plane convergence to ABR that = has reachability to component prefixes. =C2=A0

<= /div>
I will send out tomorrow.
Thanks=C2=A0

Gyan

On Wed, Nov 18, 2020 at 9:37 PM Aijun Wang <wangaijun@tsinghu= a.org.cn> wrote:

Hi, Acee:

=C2=A0

OK, we will try to improve this document to meet this cr= iteria.

And, as this topic has been discussed intensely on the mail list, we = are also eager to invite more interested experts to join us as co-authors t= o refine the solutions for more scenarios.

=C2=A0

Thanks in advance.

=C2=A0

Best Regards=

=C2=A0

Aijun Wang

China Telecom

=C2=A0=

=C2=A0=

From: Acee= Lindem (acee) <acee= @cisco.com>
Sent: Thursday, November 19, 2020 12:42 AMTo: Aijun Wang <wangaijun@tsinghua.org.cn>; 'Robert Raszuk' &= lt;robert@raszuk.net= >; 'Jeff Tantsura' <jefftant.ietf@gmail.com>
Cc: '= Gyan Mishra' <hayabusagsm@gmail.com>; 'lsr' <lsr@ietf.org>; 'Acee Lindem (acee)&= #39; <acee=3D40cisco.com@dmarc.ietf.org>
Subject: Re: [Lsr] Prefix= Unreachable Announcement Use Cases

= =C2=A0

<= span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif"= >Speaking as WG Co-Chair:

=C2=A0

From: Aijun Wang <wangaijun@tsinghua.org.cn&g= t;
Date: Wednesday, November 18, 2020 at 3:05 AM
To: Ro= bert Raszuk <robe= rt@raszuk.net>, Jeff Tantsura <jefftant.ietf@gmail.com>
Cc: &#= 39;Gyan Mishra' <hayabusagsm@gmail.com>, Acee Lindem <acee@cisco.com>, 'lsr' <<= a href=3D"mailto:lsr@ietf.org" target=3D"_blank">lsr@ietf.org>, &quo= t;'Acee Lindem (acee)'" <acee=3D40cisco.com@dmarc.ietf.org&= gt;
Subject: RE: [Lsr] Prefix Unreachable Announcement Use Cases<= u>

=C2=A0

Hi, Robert:

=C2=A0

The trig= ger and propagation of PUA info can be standardized, the actions based on t= he PUA can be different in different situation.

We can discuss and describe the actions based on = different scenarios after its WG adoption?<= /p>

=C2=A0=

There will b= e no adoption call until there is a coherent draft with use case(s) and via= ble actions.

=C2=A0

Thanks,

Acee

=C2=A0=

=C2=A0

Best Regards

=C2=A0

Aijun Wang

China = Telecom

=C2=A0

From: Robert Raszuk <robert@raszuk.net>
S= ent: Wednesday, November 18, 2020 3:49 PM
To: Jeff Tantsura &= lt;jefftant.ie= tf@gmail.com>
Cc: Gyan Mishra <hayabusagsm@gmail.com>; Acee Lind= em (acee) <acee@cisc= o.com>; lsr <ls= r@ietf.org>; Aijun Wang <wangaijun@tsinghua.org.cn>; Acee Lindem (acee= ) <acee=3D40cisco.com@dmarc.ietf.org>
Subject: Re: [Lsr] Pr= efix Unreachable Announcement Use Cases<= u>

=C2=A0

Jeff,

=

=C2=A0

Please notice that WAN is not an IX.= =C2=A0

=C2=A0

=

While you can have full mesh of BFD sessions among all IXP participants ea= ch bombarding each over over TB fabric every 100 ms or so to map the same o= ver global WAN is a different game. If nothing else RTT between IXP partici= pants in healthy IX is around 1 ms while RTT between PEs distributed global= ly is often 100-200 ms.=C2=A0

=C2=A0

Just imagine 1000 PEs in 10 areas distributed all= over the world. That means that in worst case scenario (say same mgmt VPN = present on each PE) you will establish 1000*999 BFD sessions. Now for this = to make sense timer needs to be 100 ms or so with 3x or 5x multiplier. Anyt= hing slower will defeat the purpose as BGP withdraw will be faster.=C2=A0

=C2=A0

Then we= go into queuing issues. If BFD packets are queued at any interface meltdow= ns may occur which can be far worse in consequences then waiting for BGP se= rvice route removal. Such meltdowns often result in cascading effects to th= e applications itself.=C2=A0

=C2=A0

So this is not at all about autodiscovery with which= address to setup=C2=A0the BFD session. It is much more about operational a= spects of going that direction.=C2=A0

=C2=A0=

With that I am supportive of this work even= if we label it as experimental for some time. As each network is different= what is optimal solution for one design and deployment may not be optimal = for the other.=C2=A0

=C2=A0

Many thx,

Robert

=C2=A0

=C2=A0<= /u>

<= span lang=3D"EN-US">On Wed, Nov 18, 2020 at 4:34 AM Jeff Tantsura <jefftant.ietf@gmail= .com> wrote:

We have been discussing for quite some time and = in different wg's (there=E2=80=99s IX with = RS use case) BFD verification based on next-hop extraction, Robert - you sh= ould know. (also built a well working prototype in previous life).=C2=A0
Very simple logic:

Upon route import (BGP update received and i= mported), extract next-hop, walk BFD session table, if no match (no existin= g session) - establish (S)BFD session (Discriminators distribution is a sol= ved problem) to the next-hop, associate fate of all routes received from it= , keep timers reasonable to prevent false positives.

State is limite= d to PE=E2=80=99s importing each others routes = (sharing a service) only
High degree of automation
No IGP pollution= =C2=A0

=C2=A0

Cheers,

Jeff=

<= p class=3D"MsoNormal" style=3D"margin-right:0cm;margin-bottom:12pt;margin-l= eft:78pt">On Nov 17, 2020, 6:43 AM -0800, Acee Lindem = (acee) <acee@cisco.c= om>, wrote:

Speaking as WG member:

=C2=A0

I think it would be good to hone in on the BGP PE failure convergen= ce use case as suggested by Robert. It seems there is some interest here al= though I=E2=80=99m not convinced the IGP is the= right place to solve this problem.

=C2=A0

Thanks,

Acee

=C2=A0

From: Lsr <= lsr-bounces@ietf.org> on behalf of Gyan Mishra <hayabusagsm@gmail.com>
= Date: Tuesday, November 17, 2020 at 4:02 AM
To: Robert Ras= zuk <robert@raszu= k.net>
Cc: lsr <lsr@ietf.org>, Jeff Tantsura <jefftant.ietf@gmail.com>, Aiju= n Wang <w= angaijun@tsinghua.org.cn>, "Acee Lindem (acee)" <acee= =3D40cisco.= com@dmarc.ietf.org>
Subject: Re: [Lsr] Prefix Unreachable = Announcement Use Cases

=C2=A0

=C2=A0

=C2=A0

On Tue, Nov 17, 2020 at 3:36 AM Robert Raszuk= <robert@raszuk.n= et> wrote:

=C2=A0<= u>

=C2=A0

<= blockquote style=3D"border-top:none;border-right:none;border-bottom:none;bo= rder-left:1pt solid rgb(204,204,204);padding:0cm 0cm 0cm 6pt;margin:5pt 0cm= 5pt 4.8pt">

=C2=A0 =C2=A0Robert, I believe the original intenti= on was related to having the data plane converge quickly when summarization= is used and flip so traffic converges from the Active ABR to the Backup AB= R.=C2=A0

=C2=A0=

I do not buy this use case. Flooding within t= he area is fast such that both ABRs will get the same info. As mentioned be= fore there is no practical use of PUA for making any routing or fwd decisio= n on which ABR to use. If your ABRs are not connected with min redundancy t= his draft is a worst patch ever to work around such a design.=C2=A0<= u>

=C2=A0

=C2=A0 =C2=A0Gyan> Agreed.=C2=A0 The point of PUA in ABR u= se case is the ability to track the component prefixes and in case where co= mponent is down and traffic is still forwarded to the ABR and dropped.=C2= =A0 The other more important use case is when links are down within the are= a and the area is partitioned and so one ABR has all component prefixes how= ever other ABR is missing half the component prefixes.=C2=A0 So since the A= BR will by default advertise the summary as long as their is one component = UP the summary is still advertised.=C2=A0 So this use case is severely impa= cting as now you have an ECMP path to the other area for the summary via th= e two ABRs and you drop half your traffic.=C2=A0 So now with PUA the proble= m is fixed and the PUA is sent and now traffic is only sent to the ABR that= has the component prefixes.

=C2=A0

Please present us a pictu= re indicating before and after ABRs behaviour.=C2=A0

=C2=A0

= =C2=A0 =C2=A0 =C2=A0Gyan> will do=C2=A0

=C2=A0

=C2=A0 =C2=A0However PUA can be used in the absence of area segm= entation within a single area when a link or node fails to converge the dat= a plane quickly by sending PUA for the backup path so the active path.=C2= =A0

=C2=A0<= u>

If there is no area segmentation then there is no = summaries. So what are we missing in the first place ?=C2=A0<= /span>

=C2=A0

=

=C2=A0 =C2=A0 Gyan> Sorry I am stating that PUA feature can also= be used intra area where if a link or node goes down to improve data plane= convergence.

=C2=A0=

=C2=A0

<= span lang=3D"EN-US">With the IGP tuned with BFD fast detection on ISIS or O= SPF links and LFA & RLFA for MPLS or TI-LFA for SR local protection - w= ith those tweaks the convergence is well into sub second.=C2=A0 So for Intr= a area convergence with all the optimizations mentioned I am not sure how m= uch faster the data plane will converge with PUA.

<= /div>

=C2=A0

<= p class=3D"MsoNormal" style=3D"margin-left:114pt">Even= without any of the above listed chain of acronymous things will generally = work well intra-area without PUAs.=C2=A0

=C2=A0

=C2=A0 =C2= =A0 Gyan> Agreed which is why I mentioned the BGP next hop self use case= if I could figure out how PUA could help there that would be a major benef= it of PUA.

=C2=A0=

Thx,
R.

= =C2=A0

=C2=A0

--

<>

Gyan Mishra

Network Solutions Architect=C2=A0

M 301 502-1347
13101 Columbia Pike=C2=A0
= Silver Spring, MD

<= /div>

=C2=A0

<= /div>
--


Gyan Mishra

= Network Solutions Architect=C2=A0

M 301 502-13= 47
13101 Columbia Pike= =C2=A0
Silver S= pring, MD


<= /div>
--
--0000000000004d64d305b485d565-- From nobody Fri Nov 20 01:45:25 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id BE7633A12CD for ; Fri, 20 Nov 2020 01:45:24 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.097 X-Spam-Level: X-Spam-Status: No, score=-2.097 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=unavailable autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id KWD14Vbo4_69 for ; Fri, 20 Nov 2020 01:45:23 -0800 (PST) Received: from mail-io1-xd2a.google.com (mail-io1-xd2a.google.com [IPv6:2607:f8b0:4864:20::d2a]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 32F9B3A12CA for ; Fri, 20 Nov 2020 01:45:23 -0800 (PST) Received: by mail-io1-xd2a.google.com with SMTP id s10so9302470ioe.1 for ; Fri, 20 Nov 2020 01:45:23 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=wng7qePEw6Kv2OPy7aZlHAd8bQRQNplFxvcEH95tnj4=; b=tSmfwiKbxwuuoTkaUFY/Pha716gIRg/IRadKlTcsKlIrtXr5zWU+EsmBVnIpR4l0KY 7SOx5s9G2ONQOulIE/IdP2ufsa9UROqN6T1SMqU3WKybpWrPtyO2brdV9yrIPsM6qGmL eFJbZonSje84FqzKnD1UVQqMfvHqczAy59zRirpmCMQi12LCwcsdEj+uO0/vJHaxj45V x8GILNndZJ41mj4Dw2eEc94LFWAp6VHWbfRpf7w99eo5H+yD7S/FSHwLPhwIQ0lGuwMK tq+RHO6MJZGLr4Tj7gSInA2p7j2K7ESwIjhQOuTVp4YMTCdzwoM1jSub/NDjJbWxHIsT Jfeg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=wng7qePEw6Kv2OPy7aZlHAd8bQRQNplFxvcEH95tnj4=; b=NvKbbW3uu1HGYkmzwfHGrLy0D4/rYOKBee62gC+5ESSFA8qxKwupZj4NT9Gy2JO9vN tMFMZuOnCJwiwCkhYSnmaaPWNxfXnYO+J4cBw4sg5lsgUO44KSA7t7lnxvpUAb0SjamE GI1p9MStDhiOub3ghtayzGQ2iRy4Z83bYNo0GCvGYyO1u4LUJQrvdGu9UdZSX19N0b43 XWr4jPuUowLEUr713KoxJ5UZZ3vmnGD8TbBDM5IYEy0V8s46Mpl5U9ivLqPz26U0rM4s 5mg/SC1Oyyl6h2dd1767tKb3rCWlrSJHFx8SGKQGZNTooZw+4J9DZo9ab+0Zd/e1m0DJ /EpQ== X-Gm-Message-State: AOAM531cRgrpbfWanyFdbIMrEjbGdXO/33RSQ4LNnq88L+ZxMDO9d/1Z dbYxmcO2peFutDnoreVLe9ke4RSySDT7ClU+Qu8= X-Google-Smtp-Source: ABdhPJxwrxVZqefd9G3WqH/0WhISJ4E/VhAAnLJNXeHA0V6xMP6DIQESFuOc/Zw+fYqRdedpQZ37PqycmZYD7UKbiK4= X-Received: by 2002:a6b:8bcf:: with SMTP id n198mr23704581iod.122.1605865522379; Fri, 20 Nov 2020 01:45:22 -0800 (PST) MIME-Version: 1.0 References: In-Reply-To: From: Tony Przygienda Date: Fri, 20 Nov 2020 01:44:45 -0800 Message-ID: To: Jeff Tantsura Cc: Robert Raszuk , lsr , Aijun Wang , "Acee Lindem (acee)" Content-Type: multipart/alternative; boundary="00000000000004be4d05b486b421" Archived-At: Subject: Re: [Lsr] Prefix Unreachable Announcement Use Cases X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 20 Nov 2020 09:45:25 -0000 --00000000000004be4d05b486b421 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Yes, acknowledging the idea of negative disaggregation is inspired by RIFT work is fine (and normally, when inspired by an idea at least in research cycles it is considered basic courtesy to refer to the according source, something has been lost more and more in IETF over time I dare to observe which in itself reflects on the community IMO) but please do not try to compare the two beyond that. Disaggregation works well on directed graphs (lattices) or arguably if your addressing scheme is aligned with regular topology (hypercube e.g.). it works in generic graphs in super special cases only & it will be @ best a crutch that may under all the correct circumstances have some utility but probably ends up hurting operationally more than helping. The indication that "magic timer" is needed in the draft should be first warning, all kind of seat-of-pants heuristics to dis- and re-aggregate 2nd. Just quickly flying through the draft I see lots of logic problems already that will lead to vexing effects, e.g. indication of missing neighbor will work in specific type of topologies, in others varying by one link only may lead to stable blackholes. my 2c -- tony On Sun, Nov 15, 2020 at 11:29 AM Jeff Tantsura wrote: > As RIFT chair - I=E2=80=99d like to respond to Robert=E2=80=99 comment - = the example is > rather unfortunate, in RIFT disaggregation is conditional and well > contained within its context, it doesn=E2=80=99t affect overall scalabil= ity. > > Regards, > Jeff > > On Nov 15, 2020, at 08:44, Robert Raszuk wrote: > > =EF=BB=BF > Hi Aijun, > > I would in fact only propose that the presented mechanism is narrowed dow= n > to invalidate BGP (service) routes - in fact their next hops. > > The reason being that the moment you make the solution generic, moreover > the moment you want it to be used in RIB and data plane I am afraid you a= re > running into similar (even if local) deaggregation mechanism like recentl= y > described in RIFT. That would kill all the scalability of advertising > summary routes in the first place and I bet would face lots of opposition= . > > Thx, > R. > > >> I would actually trim most use cases leaving just one - to signal remote >> service node (ex: PE) going down in the presence of summary route being >> advertised from remote area or pop. >> >> [WAJ] Yes, this may be the most useful use case, but the PUA mechanism > can also apply to other scenarios. We want to make it one general solutio= n. > _______________________________________________ > Lsr mailing list > Lsr@ietf.org > https://www.ietf.org/mailman/listinfo/lsr > > _______________________________________________ > Lsr mailing list > Lsr@ietf.org > https://www.ietf.org/mailman/listinfo/lsr > --00000000000004be4d05b486b421 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Disaggregation works well on di= rected graphs (lattices) or arguably if your addressing scheme is aligned wi= th regular topology (hypercube e.g.). it works in generic graphs in super sp= ecial cases only & it will be @ best a crutch that may under all the cor= rect circumstances have some utility but probably ends up hurting operationa= lly more than helping.
[WAJ] PUA will try to a= void the solution that can only fit some special topology or address schema.=

Th= e indication that "magic timer" is needed in the draft should be first warni= ng, all kind of seat-of-pants heuristics to dis- and re-aggregate 2nd. =

[WAJ] =E2=80=9Ctimer=E2=80=9D= is not uncommon in IGP protocol. Using it within PUA mechanism is just to a= ssure the service switch successfully upon it receives the PUA.
Just quic= kly flying through the draft I see lots of logic problems already that will l= ead to vexing effects, e.g. indication of missing neighbor will work in spec= ific type of topologies, in others varying by one link only may lead to stab= le blackholes.
[WAJ] Would you like t= o state the above conclusion more clearly?


my 2c

=
-- tony

On Sun, Nov 15, 2020 at 11:29 AM Jeff Tantsura &l= t;jefftant.ietf@gmail.com>= wrote:
As RIFT chair - I=E2=80=99d like to respond to Robert=E2=80=99 commen= t -  the example is rather  unfortunate, in RIFT disaggregation is= conditional and well contained within its context, it doesn=E2=80=99t  = ;affect overall scalability.

Regards,
Jeff
=

On Nov 15, 2020, at 08:= 44, Robert Raszuk <robert@raszuk.net> wrote:

=EF=BB=BF
Hi Aijun,

I would in fact only propose tha= t the presented mechanism is narrowed down to invalidate BGP (service) route= s - in fact their next hops. 

The reason b= eing that the moment you make the solution generic, moreover the moment you w= ant it to be used in RIB and data plane I am afraid you are running into sim= ilar (even if local) deaggregation mechanism like recently described in= RIFT. That would kill all the scalability of advertising summary routes in t= he first place and I bet would face lots of opposition. 

=
Thx,
R.
 
I would actual= ly trim most use cases leaving just one - to signal remote service node (ex:= PE) going down in the presence of summary route being advertised from remot= e area or pop. 
 [WAJ] Yes, this may be the most useful use case, but the PUA m= echanism can also apply to other scenarios. We want to make it one general s= olution.
_______________________________________________
Lsr ma= iling list
Lsr@ietf.org
https://www.ietf.org/mailman/listinfo/lsr<= /span>
_________________________________________= ______
Lsr mailing list
Lsr@ietf.org
https://www.ietf.org/mailman/listinfo/lsr
_______________________________________________
Lsr ma= iling list
Lsr@ietf.org
https://www.ietf.org= /mailman/listinfo/lsr
Yes, acknowledging the idea of negative disaggregatio= n is inspired by RIFT work is fine (and normally, when inspired by an idea = at least in research cycles it is considered basic courtesy to refer to the= according source, something has been lost more and more in IETF over time = I dare to observe which in itself reflects on the community IMO) but please= do not try to compare the two beyond that. Disaggregation works well on di= rected graphs (lattices) or arguably if your addressing scheme is aligned w= ith regular topology (hypercube e.g.). it works in generic graphs in super = special cases only & it will be @ best a crutch that may under all the = correct circumstances have some utility but probably ends up hurting operat= ionally more than helping. The indication that "magic timer" is n= eeded in the draft should be first warning, all kind of seat-of-pants heuri= stics to dis- and re-aggregate 2nd.=C2=A0 Just quickly flying through the d= raft I see lots of logic problems already that will lead to vexing effects,= e.g. indication of missing neighbor will work in specific type of topologi= es, in others varying by one link only may lead to stable blackholes.
<= /div>

my 2c

-- tony
<= /div>
O= n Sun, Nov 15, 2020 at 11:29 AM Jeff Tantsura <jefftant.ietf@gmail.com> wrote:
As RIFT chair - = I=E2=80=99d like to respond to Robert=E2=80=99 comment - =C2=A0the example = is rather =C2=A0unfortunate, in RIFT disaggregation is conditional and well= contained within its context, it doesn=E2=80=99t =C2=A0affect overall scal= ability.

Regards,
Jeff

On Nov 15, 2020, at 08:44, Robert Raszuk = <robert@raszuk.ne= t> wrote:

=EF=BB=BF
Hi Aij= un,

I would in fact only propose that the presente= d mechanism is narrowed down to invalidate BGP (service) routes - in fact= =C2=A0their next hops.=C2=A0

The reason being that= the moment you make the solution generic, moreover the moment you want it = to be used in RIB and data plane I am afraid you are running into similar= =C2=A0(even if local) deaggregation mechanism like recently described in RI= FT. That would kill all the scalability of advertising summary routes in th= e first place and I bet would face lots of opposition.=C2=A0

=
Thx,
R.
=C2=A0
<= div dir=3D"ltr">
I would ac= tually trim most use cases leaving just one - to signal remote service node= (ex: PE) going down in the presence of summary route being advertised from= remote area or pop.=C2=A0
=C2=A0[WAJ] Yes, this may be the most useful use case, but = the PUA mechanism can also apply to other scenarios. We want to make it one= general solution.
_______________________________________________
Lsr m= ailing list
Lsr@ietf.org
https://www.ietf.org/mailman/listinfo/lsr<= /a>
____________________________________= ___________
Lsr mailing list
Lsr@ietf.org
https://www.ietf.org/mailman/listinfo/lsr
--00000000000004be4d05b486b421-- From nobody Fri Nov 20 06:27:35 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 97AD33A0AAD for ; Fri, 20 Nov 2020 06:27:34 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.895 X-Spam-Level: X-Spam-Status: No, score=-1.895 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, MIME_QP_LONG_LINE=0.001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id nHhVPZc3WkRQ for ; Fri, 20 Nov 2020 06:27:31 -0800 (PST) Received: from mail-m127101.qiye.163.com (mail-m127101.qiye.163.com [115.236.127.101]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 415303A0A93 for ; Fri, 20 Nov 2020 06:27:30 -0800 (PST) Received: from localhost.localdomain (unknown [106.121.130.5]) by mail-m127101.qiye.163.com (Hmail) with ESMTPA id 68FBA4580F; Fri, 20 Nov 2020 22:27:24 +0800 (CST) Content-Type: multipart/alternative; boundary=Apple-Mail-8E520655-D36D-40AC-982F-BE292B5D2148 Content-Transfer-Encoding: 7bit From: Aijun Wang Mime-Version: 1.0 (1.0) Date: Fri, 20 Nov 2020 22:27:22 +0800 Message-Id: <8384F1B4-7AB2-4951-BAEA-3FC02A0ADDBD@tsinghua.org.cn> References: Cc: Jeff Tantsura , lsr , Robert Raszuk , "Acee Lindem (acee)" In-Reply-To: To: Tony Przygienda X-Mailer: iPhone Mail (18A373) X-HM-Spam-Status: e1kfGhgUHx5ZQUtXWQgYFAkeWUFZS1VLWVdZKFlBSkxLS0o3V1ktWUFJV1 kPCRoVCBIfWUFZHUNMGB1PTE5CH0lNVkpNS05DQ0lPT09NSEtVEwETFhoSFyQUDg9ZV1kWGg8SFR 0UWUFZT0tIVUpKS09ISFVLWQY+ X-HM-Sender-Digest: e1kMHhlZQR0aFwgeV1kSHx4VD1lBWUc6Ny46SSo6Sj8uCQMJPDcKE0sQ GDwaCSxVSlVKTUtOQ0NJT09OS0pCVTMWGhIXVQwaFRwaEhEOFTsPCBIVHBMOGlUUCRxVGBVFWVdZ EgtZQVlKS01VSklKVUpIS1VOWVdZCAFZQUpKT0JONwY+ X-HM-Tid: 0a75e60d7a929865kuuu68fba4580f Archived-At: Subject: Re: [Lsr] Prefix Unreachable Announcement Use Cases X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 20 Nov 2020 14:27:35 -0000 --Apple-Mail-8E520655-D36D-40AC-982F-BE292B5D2148 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Hi, Tony: Aijun Wang China Telecom > On Nov 20, 2020, at 17:45, Tony Przygienda wrote: >=20 > =EF=BB=BF > Yes, acknowledging the idea of negative disaggregation is inspired by RIFT= work is fine (and normally, when inspired by an idea at least in research c= ycles it is considered basic courtesy to refer to the according source, some= thing has been lost more and more in IETF over time I dare to observe which i= n itself reflects on the community IMO) but please do not try to compare the= two beyond that. [WAJ] PUA has no relation with RIFT. I have not yet study what=E2=80=99s pro= blem it encountered, but welcome the experts have such design experience to p= oint out the pitfall that PUA can bypass. > Disaggregation works well on directed graphs (lattices) or arguably if you= r addressing scheme is aligned with regular topology (hypercube e.g.). it wo= rks in generic graphs in super special cases only & it will be @ best a crut= ch that may under all the correct circumstances have some utility but probab= ly ends up hurting operationally more than helping. [WAJ] PUA will try to avoid the solution that can only fit some special topo= logy or address schema. > The indication that "magic timer" is needed in the draft should be first w= arning, all kind of seat-of-pants heuristics to dis- and re-aggregate 2nd.=20= [WAJ] =E2=80=9Ctimer=E2=80=9D is not uncommon in IGP protocol. Using it with= in PUA mechanism is just to assure the service switch successfully upon it r= eceives the PUA. > Just quickly flying through the draft I see lots of logic problems already= that will lead to vexing effects, e.g. indication of missing neighbor will w= ork in specific type of topologies, in others varying by one link only may l= ead to stable blackholes.=20 [WAJ] Would you like to state the above conclusion more clearly? >=20 > my 2c >=20 > -- tony=20 >=20 >> On Sun, Nov 15, 2020 at 11:29 AM Jeff Tantsura w= rote: >> As RIFT chair - I=E2=80=99d like to respond to Robert=E2=80=99 comment - = the example is rather unfortunate, in RIFT disaggregation is conditional a= nd well contained within its context, it doesn=E2=80=99t affect overall sca= lability. >>=20 >> Regards, >> Jeff >>=20 >>>> On Nov 15, 2020, at 08:44, Robert Raszuk wrote: >>>>=20 >>> =EF=BB=BF >>> Hi Aijun, >>>=20 >>> I would in fact only propose that the presented mechanism is narrowed do= wn to invalidate BGP (service) routes - in fact their next hops.=20 >>>=20 >>> The reason being that the moment you make the solution generic, moreover= the moment you want it to be used in RIB and data plane I am afraid you are= running into similar (even if local) deaggregation mechanism like recently d= escribed in RIFT. That would kill all the scalability of advertising summary= routes in the first place and I bet would face lots of opposition.=20 >>>=20 >>> Thx, >>> R. >>> =20 >>>>> I would actually trim most use cases leaving just one - to signal remo= te service node (ex: PE) going down in the presence of summary route being a= dvertised from remote area or pop.=20 >>> [WAJ] Yes, this may be the most useful use case, but the PUA mechanism c= an also apply to other scenarios. We want to make it one general solution. >>> _______________________________________________ >>> Lsr mailing list >>> Lsr@ietf.org >>> https://www.ietf.org/mailman/listinfo/lsr >> _______________________________________________ >> Lsr mailing list >> Lsr@ietf.org >> https://www.ietf.org/mailman/listinfo/lsr > _______________________________________________ > Lsr mailing list > Lsr@ietf.org > https://www.ietf.org/mailman/listinfo/lsr --Apple-Mail-8E520655-D36D-40AC-982F-BE292B5D2148 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable Hi, Tony:

Aijun Wan= g
China Telecom

On Nov 20, 2020, at 17:45, Tony Przygienda <tonysietf@gmail.com> wro= te:

=EF= =BB=BF
Yes, acknowledging the idea of negative disaggre= gation is inspired by RIFT work is fine (and normally, when inspired by an i= dea at least in research cycles it is considered basic courtesy to refer to t= he according source, something has been lost more and more in IETF over time= I dare to observe which in itself reflects on the community IMO) but please= do not try to compare the two beyond that.
<= div>[WAJ] PUA has no relation with RIFT. I have not yet study what=E2=80=99s= problem it encountered, but welcome the experts have such design experience= to point out the pitfall that PUA can bypass.
= --Apple-Mail-8E520655-D36D-40AC-982F-BE292B5D2148-- From nobody Fri Nov 20 06:48:23 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 2EDA53A0BAB for ; Fri, 20 Nov 2020 06:48:21 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.885 X-Spam-Level: X-Spam-Status: No, score=-1.885 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, MIME_QP_LONG_LINE=0.001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_REMOTE_IMAGE=0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id SIF-vPL_0xOm for ; Fri, 20 Nov 2020 06:48:17 -0800 (PST) Received: from mail-m127101.qiye.163.com (mail-m127101.qiye.163.com [115.236.127.101]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id D44AC3A0BAD for ; Fri, 20 Nov 2020 06:48:16 -0800 (PST) Received: from localhost.localdomain (unknown [106.121.130.5]) by mail-m127101.qiye.163.com (Hmail) with ESMTPA id 0EB8A464CB; Fri, 20 Nov 2020 22:48:02 +0800 (CST) Content-Type: multipart/alternative; boundary=Apple-Mail-E3A5BCB6-4E66-4CF9-9A86-86782BA137CB Content-Transfer-Encoding: 7bit From: Aijun Wang Mime-Version: 1.0 (1.0) Date: Fri, 20 Nov 2020 22:48:00 +0800 Message-Id: <4D9C2F69-C358-4F49-A9F9-5CB0956AFEB0@tsinghua.org.cn> References: Cc: Gyan Mishra , "Acee Lindem (acee)" , lsr In-Reply-To: To: Robert Raszuk X-Mailer: iPhone Mail (18A373) X-HM-Spam-Status: e1kfGhgUHx5ZQUtXWQgYFAkeWUFZS1VLWVdZKFlBSkxLS0o3V1ktWUFJV1 kPCRoVCBIfWUFZS09LTkJIHUMYShofVkpNS05DQ0hNQ0lPSk5VEwETFhoSFyQUDg9ZV1kWGg8SFR 0UWUFZT0tIVUpKS0hKTFVLWQY+ X-HM-Sender-Digest: e1kMHhlZQR0aFwgeV1kSHx4VD1lBWUc6ORQ6MBw5KD8ZAQMzLDIxEj0z MBBPCzJVSlVKTUtOQ0NITUNJQkpDVTMWGhIXVQwaFRwaEhEOFTsPCBIVHBMOGlUUCRxVGBVFWVdZ EgtZQVlKS01VSklKVUpIS1VOWVdZCAFZQU9NTk9MNwY+ X-HM-Tid: 0a75e6205d0f9865kuuu0eb8a464cb Archived-At: Subject: Re: [Lsr] Prefix Unreachable Announcement Use Cases X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 20 Nov 2020 14:48:21 -0000 --Apple-Mail-E3A5BCB6-4E66-4CF9-9A86-86782BA137CB Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Hi, Robert: Aijun Wang China Telecom > On Nov 20, 2020, at 16:10, Robert Raszuk wrote: >=20 > =EF=BB=BF > Gyan, >=20 > I like and support your use case #1=20 >=20 > For use case #2 I have doubts. Imagine indeed an area which get's partitio= ned such that ABR will loose connectivity to bunch of nodes. Does this mean t= hat now such ABR will be blasting globally perhaps 1000s of PUAs ? How would= the ABR be able to send PUA summary provided some disconnected POPs within a= rea could be nicely summarized ? [WAJ] If ABR can do PUA summary, it is certainly better. Or else, send the =E2= =80=9CPUA+Summary=E2=80=9D for failure prefixes or send the =E2=80=9Cdetaile= d reachable information-summary=E2=80=9C for connected prefixes, depend whic= h one is less. Do you have other proposals? > Isn't it better to design your area such that ABRs are interconnected with= redundancy ?=20 [WAJ] Such requirement is certainly reasonable, but it still can=E2=80=99t a= void the extreme situation.=20 >=20 > Thx, > R. >=20 >=20 >=20 >> On Fri, Nov 20, 2020 at 3:28 AM Gyan Mishra wrote= : >>=20 >> Aijun=20 >>=20 >> I am thinking per the feedback received let=E2=80=99s keep it really simp= le. We need a solid use case to move the ball forward were the PUA data pla= ne convergence capabilities can fills a gap that exists today.=20 >>=20 >> I have two simple solutions to start that I will update the presentation w= ith to start and present to the WG and we can go from there. >>=20 >> 1. BGP NH tracking via PUA of NH component prefix to converge the data p= lane >>=20 >> 2. Area partitioned scenario where PUA is used for data plane convergenc= e to ABR that has reachability to component prefixes. =20 >>=20 >> I will send out tomorrow. >>=20 >> Thanks=20 >>=20 >> Gyan >>=20 >>> On Wed, Nov 18, 2020 at 9:37 PM Aijun Wang w= rote: >>> Hi, Acee: >>>=20 >>> =20 >>>=20 >>> OK, we will try to improve this document to meet this criteria. >>>=20 >>> And, as this topic has been discussed intensely on the mail list, we are= also eager to invite more interested experts to join us as co-authors to re= fine the solutions for more scenarios. >>>=20 >>> =20 >>>=20 >>> Thanks in advance. >>>=20 >>> =20 >>>=20 >>> Best Regards >>>=20 >>> =20 >>>=20 >>> Aijun Wang >>>=20 >>> China Telecom >>>=20 >>> =20 >>>=20 >>> =20 >>>=20 >>> From: Acee Lindem (acee) =20 >>> Sent: Thursday, November 19, 2020 12:42 AM >>> To: Aijun Wang ; 'Robert Raszuk' ; 'Jeff Tantsura' >>> Cc: 'Gyan Mishra' ; 'lsr' ; 'Acee L= indem (acee)' >>> Subject: Re: [Lsr] Prefix Unreachable Announcement Use Cases >>>=20 >>> =20 >>>=20 >>> Speaking as WG Co-Chair: >>>=20 >>> =20 >>>=20 >>> From: Aijun Wang >>> Date: Wednesday, November 18, 2020 at 3:05 AM >>> To: Robert Raszuk , Jeff Tantsura >>> Cc: 'Gyan Mishra' , Acee Lindem ,= 'lsr' , "'Acee Lindem (acee)'" >>> Subject: RE: [Lsr] Prefix Unreachable Announcement Use Cases >>>=20 >>> =20 >>>=20 >>> Hi, Robert: >>>=20 >>> =20 >>>=20 >>> The trigger and propagation of PUA info can be standardized, the actions= based on the PUA can be different in different situation. >>>=20 >>> We can discuss and describe the actions based on different scenarios aft= er its WG adoption? >>>=20 >>> =20 >>>=20 >>> There will be no adoption call until there is a coherent draft with use c= ase(s) and viable actions. >>>=20 >>> =20 >>>=20 >>> Thanks, >>>=20 >>> Acee >>>=20 >>> =20 >>>=20 >>> =20 >>>=20 >>> Best Regards >>>=20 >>> =20 >>>=20 >>> Aijun Wang >>>=20 >>> China Telecom >>>=20 >>> =20 >>>=20 >>> From: Robert Raszuk =20 >>> Sent: Wednesday, November 18, 2020 3:49 PM >>> To: Jeff Tantsura >>> Cc: Gyan Mishra ; Acee Lindem (acee) ; lsr ; Aijun Wang ; Acee Linde= m (acee) >>> Subject: Re: [Lsr] Prefix Unreachable Announcement Use Cases >>>=20 >>> =20 >>>=20 >>> Jeff, >>>=20 >>> =20 >>>=20 >>> Please notice that WAN is not an IX.=20 >>>=20 >>> =20 >>>=20 >>> While you can have full mesh of BFD sessions among all IXP participants e= ach bombarding each over over TB fabric every 100 ms or so to map the same o= ver global WAN is a different game. If nothing else RTT between IXP particip= ants in healthy IX is around 1 ms while RTT between PEs distributed globally= is often 100-200 ms.=20 >>>=20 >>> =20 >>>=20 >>> Just imagine 1000 PEs in 10 areas distributed all over the world. That m= eans that in worst case scenario (say same mgmt VPN present on each PE) you w= ill establish 1000*999 BFD sessions. Now for this to make sense timer needs t= o be 100 ms or so with 3x or 5x multiplier. Anything slower will defeat the p= urpose as BGP withdraw will be faster.=20 >>>=20 >>> =20 >>>=20 >>> Then we go into queuing issues. If BFD packets are queued at any interfa= ce meltdowns may occur which can be far worse in consequences then waiting f= or BGP service route removal. Such meltdowns often result in cascading effec= ts to the applications itself.=20 >>>=20 >>> =20 >>>=20 >>> So this is not at all about autodiscovery with which address to setup th= e BFD session. It is much more about operational aspects of going that direc= tion.=20 >>>=20 >>> =20 >>>=20 >>> With that I am supportive of this work even if we label it as experiment= al for some time. As each network is different what is optimal solution for o= ne design and deployment may not be optimal for the other.=20 >>>=20 >>> =20 >>>=20 >>> Many thx, >>>=20 >>> Robert >>>=20 >>> =20 >>>=20 >>> =20 >>>=20 >>> On Wed, Nov 18, 2020 at 4:34 AM Jeff Tantsura w= rote: >>>=20 >>> We have been discussing for quite some time and in different wg's (there= =E2=80=99s IX with RS use case) BFD verification based on next-hop extractio= n, Robert - you should know. (also built a well working prototype in previou= s life).=20 >>>=20 >>> Very simple logic: >>>=20 >>> Upon route import (BGP update received and imported), extract next-hop, w= alk BFD session table, if no match (no existing session) - establish (S)BFD s= ession (Discriminators distribution is a solved problem) to the next-hop, as= sociate fate of all routes received from it, keep timers reasonable to preve= nt false positives. >>>=20 >>> State is limited to PE=E2=80=99s importing each others routes (sharing a= service) only >>> High degree of automation >>> No IGP pollution=20 >>>=20 >>> =20 >>>=20 >>> Cheers, >>>=20 >>> Jeff >>>=20 >>> On Nov 17, 2020, 6:43 AM -0800, Acee Lindem (acee) , wro= te: >>>=20 >>>=20 >>> Speaking as WG member: >>>=20 >>> =20 >>>=20 >>> I think it would be good to hone in on the BGP PE failure convergence us= e case as suggested by Robert. It seems there is some interest here although= I=E2=80=99m not convinced the IGP is the right place to solve this problem.= >>>=20 >>> =20 >>>=20 >>> Thanks, >>>=20 >>> Acee >>>=20 >>> =20 >>>=20 >>> From: Lsr on behalf of Gyan Mishra >>> Date: Tuesday, November 17, 2020 at 4:02 AM >>> To: Robert Raszuk >>> Cc: lsr , Jeff Tantsura , Aijun W= ang , "Acee Lindem (acee)" >>> Subject: Re: [Lsr] Prefix Unreachable Announcement Use Cases >>>=20 >>> =20 >>>=20 >>> =20 >>>=20 >>> =20 >>>=20 >>> On Tue, Nov 17, 2020 at 3:36 AM Robert Raszuk wrote:= >>>=20 >>> =20 >>>=20 >>> =20 >>>=20 >>> Robert, I believe the original intention was related to having the da= ta plane converge quickly when summarization is used and flip so traffic con= verges from the Active ABR to the Backup ABR.=20 >>>=20 >>> =20 >>>=20 >>> I do not buy this use case. Flooding within the area is fast such that b= oth ABRs will get the same info. As mentioned before there is no practical u= se of PUA for making any routing or fwd decision on which ABR to use. If you= r ABRs are not connected with min redundancy this draft is a worst patch eve= r to work around such a design.=20 >>>=20 >>> =20 >>>=20 >>> Gyan> Agreed. The point of PUA in ABR use case is the ability to tra= ck the component prefixes and in case where component is down and traffic is= still forwarded to the ABR and dropped. The other more important use case i= s when links are down within the area and the area is partitioned and so one= ABR has all component prefixes however other ABR is missing half the compon= ent prefixes. So since the ABR will by default advertise the summary as lon= g as their is one component UP the summary is still advertised. So this use= case is severely impacting as now you have an ECMP path to the other area f= or the summary via the two ABRs and you drop half your traffic. So now with= PUA the problem is fixed and the PUA is sent and now traffic is only sent t= o the ABR that has the component prefixes. >>>=20 >>> =20 >>>=20 >>> Please present us a picture indicating before and after ABRs behaviour.=20= >>>=20 >>> =20 >>>=20 >>> Gyan> will do=20 >>>=20 >>> =20 >>>=20 >>> However PUA can be used in the absence of area segmentation within a s= ingle area when a link or node fails to converge the data plane quickly by s= ending PUA for the backup path so the active path.=20 >>>=20 >>> =20 >>>=20 >>> If there is no area segmentation then there is no summaries. So what are= we missing in the first place ?=20 >>>=20 >>> =20 >>>=20 >>> Gyan> Sorry I am stating that PUA feature can also be used intra are= a where if a link or node goes down to improve data plane convergence. >>>=20 >>> =20 >>>=20 >>> =20 >>>=20 >>> With the IGP tuned with BFD fast detection on ISIS or OSPF links and LFA= & RLFA for MPLS or TI-LFA for SR local protection - with those tweaks the c= onvergence is well into sub second. So for Intra area convergence with all t= he optimizations mentioned I am not sure how much faster the data plane will= converge with PUA. >>>=20 >>> =20 >>>=20 >>> Even without any of the above listed chain of acronymous things will gen= erally work well intra-area without PUAs.=20 >>>=20 >>> =20 >>>=20 >>> Gyan> Agreed which is why I mentioned the BGP next hop self use case= if I could figure out how PUA could help there that would be a major benefi= t of PUA. >>>=20 >>> =20 >>>=20 >>> Thx, >>> R. >>>=20 >>> =20 >>>=20 >>> =20 >>>=20 >>> -- >>>=20 >>> <> >>>=20 >>> Gyan Mishra >>> Network Solutions Architect=20 >>> M 301 502-1347 >>> 13101 Columbia Pike=20 >>> Silver Spring, MD >>> =20 >>>=20 >> --=20 >>=20 >>=20 >> Gyan Mishra >> Network Solutions Architect=20 >> M 301 502-1347 >> 13101 Columbia Pike=20 >> Silver Spring, MD >>=20 --Apple-Mail-E3A5BCB6-4E66-4CF9-9A86-86782BA137CB Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable Hi, Robert:

Aijun W= ang
China Telecom

On Nov 20, 2020, at 16:10, Robert Raszuk <robert@raszuk.net> wrote= :

=EF=BB= =BF
Gyan,

I like and support your use cas= e #1 

For use case #2 I have doubts. Imagine i= ndeed an area which get's partitioned such that ABR will loose connectivity t= o bunch of nodes. Does this mean that now such ABR will be blasting globally= perhaps 1000s of PUAs ? How would the ABR be able to send PUA summary provi= ded some disconnected POPs within area could be nicely summarized ?
[WAJ] If ABR can do PUA summary, it is certainly= better.  Or else, send the =E2=80=9CPUA+Summary=E2=80=9D for failure p= refixes or send the =E2=80=9Cdetailed reachable information-summary=E2=80=9C= for connected prefixes, depend which one is less. Do you have other proposa= ls?

Isn't it better to design your area such that ABRs are interconnected with= redundancy ? 

[WAJ] S= uch requirement is certainly reasonable, but it still can=E2=80=99t avoid th= e extreme situation. 


Thx,
R.

=

On Fri, Nov 20, 2020 at 3:28 AM Gyan Mishra <hayabusagsm@gmail.com> wrote:

Aij= un 

I am thinking pe= r the feedback received let=E2=80=99s keep it really simple.  We need a= solid use case to move the ball forward were the PUA data plane convergence= capabilities can fills a gap that exists today. 

I have two simple solutions to start that I wi= ll update the presentation with to start and present to the WG and we can go= from there.

1.  BGP= NH tracking via PUA of NH component prefix to converge the data plane
=

2.  Area partitioned scen= ario where PUA is used for data plane convergence to ABR that has reachabili= ty to component prefixes.  

I will send out tomorrow.

Thanks 

Gyan<= /div>

On Wed, Nov 18, 2020 at 9:37 PM Aijun Wang <wangaijun@tsinghua.org.cn> wrote= :

Hi, Acee:<= /u>

 

OK, we will t= ry to improve this document to meet this criteria.

=

And, as this topic has been d= iscussed intensely on the mail list, we are also eager to invite more intere= sted experts to join us as co-authors to refine the solutions for more scena= rios.

 

Thanks in advance.

 

Best Regards

 

=

= Aijun Wang

China Telecom

 

 

From:= Acee Lindem (acee) <acee@cisco.com>
Sent: Thursday, November 19, 2020 12:42 A= M
To: Aijun Wang <wangaijun@tsinghua.org.cn>; 'Robert Raszuk' <robert@raszuk.net>= ; 'Jeff Tantsura' <jefftant.ietf@gmail.com>
Cc: 'Gyan Mishra' <hayabusagsm@gmail.com<= /a>>; 'lsr' <lsr@iet= f.org>; 'Acee Lindem (acee)' <acee=3D40cisco.com@dmarc.ietf.org>
= Subject: Re: [Lsr] Prefix Unreachable Announcement Use Cases

<= span lang=3D"EN-US"> 

Speaking as WG Co-Chair:

<= p class=3D"MsoNormal" style=3D"margin-left:21pt"> <= /p>

From:= Aijun Wang <wangaijun@tsinghua.= org.cn>
Date: Wednesday, November 18, 2020 at 3:05 AM
To: Robert Raszuk <robert@raszuk.net>, Jeff Tantsura <jefftant.ietf@gmail.com>
Cc= : 'Gyan Mishra' <hayabusagsm@gmail.com>, Acee Lindem <acee@cisco.com>, 'lsr' <lsr@ietf.org>, "'Acee Lindem (a= cee)'" <acee=3D40cisco.com@dmarc.ietf.org>
Subject: RE: [Lsr]= Prefix Unreachable Announcement Use Cases

 

Hi, Robert:<= span lang=3D"EN-US">

 

= The trigger and propagation of PUA info can be standa= rdized, the actions based on the PUA can be different in different situation= .

We can discuss and desc= ribe the actions based on different scenarios after its WG adoption?<= span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:=E7=AD=89=E7=BA=BF= ">

 

There will be no adoption call until there is a coherent draft with u= se case(s) and viable actions.

 

Thanks,

Acee

 =

 

Best Regards

 

Aijun Wang

China Telecom

 

From: Robert Raszuk <robert@raszuk.net>
Sent: Wednesday= , November 18, 2020 3:49 PM
To: Jeff Tantsura <jefftant.ietf@gmail.com>=
Cc: Gyan Mishra <hayabusagsm@gmail.com>; Acee Lindem (acee) <acee@cisco.com>; lsr <lsr@ietf.org>; Aijun W= ang <wanga= ijun@tsinghua.org.cn>; Acee Lindem (acee) <acee=3D40cisco.com@dmarc.ietf.= org>
Subject: Re: [Lsr] Prefix Unreachable Announcement Use= Cases

 

Jeff,

 

<= div>

P= lease notice that WAN is not an IX. 

&nbs= p;

While you can have full mesh of BFD session= s among all IXP participants each bombarding each over over TB fabric every 1= 00 ms or so to map the same over global WAN is a different game. If nothing e= lse RTT between IXP participants in healthy IX is around 1 ms while RTT betw= een PEs distributed globally is often 100-200 ms. =

 

Just imagine 1000 PEs in 10 are= as distributed all over the world. That means that in worst case scenario (s= ay same mgmt VPN present on each PE) you will establish 1000*999 BFD session= s. Now for this to make sense timer needs to be 100 ms or so with 3x or 5x m= ultiplier. Anything slower will defeat the purpose as BGP withdraw will be f= aster. 

 

Then we go into queuing issues. If BFD packets are queued at any interfa= ce meltdowns may occur which can be far worse in consequences then waiting f= or BGP service route removal. Such meltdowns often result in cascading effec= ts to the applications itself. 

 =

So this is not at all about autodiscovery with w= hich address to setup the BFD session. It is much more about operationa= l aspects of going that direction. 

=

 = ;

With that I am supportive of this work even i= f we label it as experimental for some time. As each network is different wh= at is optimal solution for one design and deployment may not be optimal for t= he other. 

 

Many thx,

Robert

 

 

On Wed, Nov 18, 2020 at 4:34 AM Jeff Tantsura <jefftant.ietf@gmail.com> wro= te:

We have been discussing for quite some time and in different wg's (th= ere=E2=80=99s IX with RS use case) BFD verificat= ion based on next-hop extraction, Robert - you should know. (also built a we= ll working prototype in previous life). 

Very simple logic:
<= br>Upon route import (BGP update received and imported), extract next-hop, w= alk BFD session table, if no match (no existing session) - establish (S)BFD s= ession (Discriminators distribution is a solved problem) to the next-hop, as= sociate fate of all routes received from it, keep timers reasonable to preve= nt false positives.

State is limited to PE=E2=80=99s importing each others routes (sharing a service) only
High degr= ee of automation
No IGP pollution 

 

Cheers, <= u>

Jeff

On Nov 17, 2020, 6= :43 AM -0800, Acee Lindem (acee) <acee@cisco.com>, wrote:

=

Speaking as WG member:

 

I think it would be good to hone in on the BGP P= E failure convergence use case as suggested by Robert. It seems there is som= e interest here although I=E2=80=99m not convinc= ed the IGP is the right place to solve this problem.

&nbs= p;

Thanks,

Acee

&nb= sp;

From: Lsr <lsr-bounces@ietf.org> on behalf of Gyan Mishra <hayabusagsm@gmail.com>Date: Tuesday, November 17, 2020 at 4:02 AM
To: Robert Ra= szuk <robert@raszu= k.net>
Cc: lsr <lsr@ietf.org>, Jeff Tantsura <jefftant.ietf@gmail.com>, Aijun Wan= g <wangaij= un@tsinghua.org.cn>, "Acee Lindem (acee)" <acee=3D40cisco.com@dmarc.ietf.org>
Subject: Re: [Lsr] Prefix Unreachable Announcement Use Case= s

 

 

=

 

=

&nbs= p;

   Rob= ert, I believe the original intention was related to having the data plane c= onverge quickly when summarization is used and flip so traffic converges fro= m the Active ABR to the Backup ABR. 

 

I do not buy thi= s use case. Flooding within the area is fast such that both ABRs will get th= e same info. As mentioned before there is no practical use of PUA for making= any routing or fwd decision on which ABR to use. If your ABRs are not conne= cted with min redundancy this draft is a worst patch ever to work around suc= h a design. 

&n= bsp;

   Gyan> Agreed.  The p= oint of PUA in ABR use case is the ability to track the component prefixes a= nd in case where component is down and traffic is still forwarded to the ABR= and dropped.  The other more important use case is when links are down= within the area and the area is partitioned and so one ABR has all componen= t prefixes however other ABR is missing half the component prefixes.  S= o since the ABR will by default advertise the summary as long as their is on= e component UP the summary is still advertised.  So this use case is se= verely impacting as now you have an ECMP path to the other area for the summ= ary via the two ABRs and you drop half your traffic.  So now with PUA t= he problem is fixed and the PUA is sent and now traffic is only sent to the A= BR that has the component prefixes.

 

Please present us a pictur= e indicating before and after ABRs behaviour. 

=

 

 =    Gyan> will do 

 

=

&nbs= p;  However PUA can be used in the absence of area segmentation within a= single area when a link or node fails to converge the data plane quickly by= sending PUA for the backup path so the active path. 

 

=

If there is no area segmentation then there is no summaries. So what are we= missing in the first place ? 

 

    Gyan>= Sorry I am stating that PUA feature can also be used intra area where if a l= ink or node goes down to improve data plane convergence.

 

<= p class=3D"MsoNormal" style=3D"margin-left:114pt"> = ;

With the IGP tuned wit= h BFD fast detection on ISIS or OSPF links and LFA & RLFA for MPLS or TI= -LFA for SR local protection - with those tweaks the convergence is well int= o sub second.  So for Intra area convergence with all the optimizations= mentioned I am not sure how much faster the data plane will converge with P= UA.

 =

Even without any of the above listed chain of acronymo= us things will generally work well intra-area without PUAs. <= /u>

 

    Gyan> Agreed which is why I mentioned the BGP next h= op self use case if I could figure out how PUA could help there that would b= e a major benefit of PUA.

=

 

Thx,
R.

 

 

--

<>

Gyan Mishra

Network Solutions Architect <= u>

M 301 502-1347
13101 Columbia Pike 
Silver Spring, MD

 

<= /div>
--


Gyan Mishra

Network Solutions Architect 

M 301 502-1347
13101 Columbia Pike 
Silver Sprin= g, MD


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X-List-Received-Date: Fri, 20 Nov 2020 20:09:19 -0000 --000000000000407f5805b48f6bb4 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, Nov 20, 2020 at 6:27 AM Aijun Wang wrote: > Hi, Tony: > > Aijun Wang > China Telecom > > On Nov 20, 2020, at 17:45, Tony Przygienda wrote: > > =EF=BB=BF > Yes, acknowledging the idea of negative disaggregation is inspired by RIF= T > work is fine (and normally, when inspired by an idea at least in research > cycles it is considered basic courtesy to refer to the according source, > something has been lost more and more in IETF over time I dare to observe > which in itself reflects on the community IMO) but please do not try to > compare the two beyond that. > > [WAJ] PUA has no relation with RIFT. I have not yet study what=E2=80=99s = problem > it encountered, but welcome the experts have such design experience to > point out the pitfall that PUA can bypass. > > aha, ok, I just chimed in because I saw people somehow implying a map of RIFT negative disaggregation in relation to this work but if this is a completely different mechanism than I just watch from the sidelines thanks -- tony --000000000000407f5805b48f6bb4 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable


=
On Fri, Nov 20, 2020 at 6:27 AM Aijun= Wang <wangaijun@tsinghua.o= rg.cn> wrote:
Hi, Tony:

Aijun Wang
Chi= na Telecom

On Nov= 20, 2020, at 17:45, Tony Przygienda <tonysietf@gmail.com> wrote:

=EF=BB=BF
Yes, acknowledging the idea of negative disaggregation is inspired = by RIFT work is fine (and normally, when inspired by an idea at least in re= search cycles it is considered basic courtesy to refer to the according sou= rce, something has been lost more and more in IETF over time I dare to obse= rve which in itself reflects on the community IMO) but please do not try to= compare the two beyond that.
[WAJ] PUA= has no relation with RIFT. I have not yet study what=E2=80=99s problem it = encountered, but welcome the experts have such design experience to point o= ut the pitfall that PUA can bypass.


aha, ok, I just chimed in because I saw people somehow implying a = map of RIFT negative disaggregation in relation to this work but if this is= a completely different mechanism than I just watch from the sidelines

thanks

-- tony
--000000000000407f5805b48f6bb4-- From nobody Fri Nov 20 12:45:31 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id BE1643A116E for ; Fri, 20 Nov 2020 12:45:29 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.098 X-Spam-Level: X-Spam-Status: No, score=-2.098 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=unavailable autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=raszuk.net Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id wN-naVLc-9Bm for ; Fri, 20 Nov 2020 12:45:25 -0800 (PST) Received: from mail-lf1-x132.google.com (mail-lf1-x132.google.com [IPv6:2a00:1450:4864:20::132]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 3335E3A1166 for ; Fri, 20 Nov 2020 12:45:24 -0800 (PST) Received: by mail-lf1-x132.google.com with SMTP id a9so15324007lfh.2 for ; Fri, 20 Nov 2020 12:45:24 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=raszuk.net; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=TdSjT4lBXFM4f4ZlvHn7hA2mSwGZ3O9XdzNskRTLXa4=; b=WVWvoykStt12OUvYpJydUl40cljNqiJOIYatJsmShzzxvT2ZUGOJy+huqNkRFoaE+y Fd6mW8Uz3Gm+FlGa3o3O/kSkhnQ/Uvhj+nRIAo/11hLE+ZPmK0crTp6SzpoJ7Qh5hMbi iRABxnUDvUeS6cEcGCHYvaIgbQyn+EKbdofchu3iUmnIYo1W0aRaDQN70XWmQ9RnLfvo lFEcTQEDbTRPnxYdcflcdbTCID12/4PYfYgo6rPIeSF373NYmeTudvRGq1/ZvaWfzd9x 5bJyHbghZXGki7grCjQcgaz69lZmH9SABEUKg3RIplvIAD0aKKUai6kdKnb56tGzUi2l MSDg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=TdSjT4lBXFM4f4ZlvHn7hA2mSwGZ3O9XdzNskRTLXa4=; b=fBRcdXJLIQHhIBZ6O5zDp/+HUHuPYN9ZFU6chXcEYq3kfXkKjAFpdqnBEVW0aDGOz3 i3YH64wkYuq1ebqbt0EPv7OpIKJBIJx7DbBgxj+dGgUiPVCFlj5TnrAngqviMQv00s5x YNpo3a41fhtfNkBeAVTJdKs04XLxlsehlndYjHrb/NwZsuEgLp1qLrDXGsQaHGymF9r3 lOSvf6G/+nECsHFd2CtClL/HcQCKqzXqPCRe4rof7pz4RFq9XxJV7Rv1hwcsVZPPaw/j pY5x3EaTssJrhjHC7I8c9D5maBoFBFautvmmDcPUsKsg8zTmUf07yy/VfyzTWeSB6tjA GrxQ== X-Gm-Message-State: AOAM532+MM0wSnsJuw8hQJ6Xwx4XAHis4nnFOlQKaIvV1z3e4I1usR1n 3zakHkSn7H4qq45sQGFs7aelSe+Krl7cNJ4qofxwVg== X-Google-Smtp-Source: ABdhPJw7l7UFtG4AvC0hHpKoWxoY1unFba0pmFM1eKeJ1DaVXKny56jtuqaSwzFVbYaLK4X551hSYWrAWC3chVO8/f4= X-Received: by 2002:ac2:598f:: with SMTP id w15mr8172810lfn.148.1605905122711; Fri, 20 Nov 2020 12:45:22 -0800 (PST) MIME-Version: 1.0 References: <8384F1B4-7AB2-4951-BAEA-3FC02A0ADDBD@tsinghua.org.cn> In-Reply-To: From: Robert Raszuk Date: Fri, 20 Nov 2020 21:45:12 +0100 Message-ID: To: Tony Przygienda Cc: Aijun Wang , lsr , Jeff Tantsura , "Acee Lindem (acee)" Content-Type: multipart/alternative; boundary="00000000000061f57c05b48fec53" Archived-At: Subject: Re: [Lsr] Prefix Unreachable Announcement Use Cases X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 20 Nov 2020 20:45:30 -0000 --00000000000061f57c05b48fec53 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hey Tony, > people somehow implying a map of RIFT negative disaggregation in relation to this work I think those people just made a subtle point that considering IGP alone if you want to influence your data plane forwarding by advertising PUA in today's hardware you really need to install more specific blocks of the summary routes which PUA punched the hole in as sent by say one of the ABR's. Analogy made to RIFT was just limited to this data plane fragment only. And that comment was not to compare PUA to RIFT negative routing in any way. It was just to a) realize what could be required if such a use case continues and more importantly b) highlight that if we just use PUA in the control plane to for example invalidate BGP next hops or other overlay service routes the disaggregation piece does not apply. Cheers, R. On Fri, Nov 20, 2020 at 9:09 PM Tony Przygienda wrote= : > > > On Fri, Nov 20, 2020 at 6:27 AM Aijun Wang > wrote: > >> Hi, Tony: >> >> Aijun Wang >> China Telecom >> >> On Nov 20, 2020, at 17:45, Tony Przygienda wrote: >> >> =EF=BB=BF >> Yes, acknowledging the idea of negative disaggregation is inspired by >> RIFT work is fine (and normally, when inspired by an idea at least in >> research cycles it is considered basic courtesy to refer to the accordin= g >> source, something has been lost more and more in IETF over time I dare t= o >> observe which in itself reflects on the community IMO) but please do not >> try to compare the two beyond that. >> >> [WAJ] PUA has no relation with RIFT. I have not yet study what=E2=80=99s= problem >> it encountered, but welcome the experts have such design experience to >> point out the pitfall that PUA can bypass. >> >> > aha, ok, I just chimed in because I saw people somehow implying a map of > RIFT negative disaggregation in relation to this work but if this is a > completely different mechanism than I just watch from the sidelines > > thanks > > -- tony > --00000000000061f57c05b48fec53 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hey Tony,

>=C2=A0 people somehow imp= lying a map of RIFT negative disaggregation in relation to this work=C2=A0= =C2=A0

I think those people just made a subtle= point that considering IGP alone if you want to influence your data plane = forwarding by advertising=C2=A0PUA in today's hardware you really need = to install more specific blocks of the summary routes which PUA punched the= hole in as sent by say one of the ABR's. Analogy made to RIFT was just= limited to this data plane fragment only.=C2=A0

A= nd that comment was not to compare PUA to RIFT negative routing in any way.= It was just to a) realize what could be required if such a use case contin= ues and more importantly b) highlight that if we just use PUA in the contro= l plane to for example invalidate BGP next hops or other overlay service ro= utes the disaggregation piece does not apply.=C2=A0

Cheers,
R.





On Fri, Nov 20, 2020 at 9:09 PM Tony Przygienda <tonysietf@gmail.com> wrote:


On Fri, Nov 20, 2020 at 6:27 AM Aijun Wang <wangaijun@tsinghua.org.cn> wrote:
Hi, Tony:

Aijun Wang
China Tele= com

On Nov 20, 20= 20, at 17:45, Tony Przygienda <tonysietf@gmail.com> wrote:

=EF=BB=BF
Yes, acknowledging the idea of negative disaggregation is inspired by RIFT= work is fine (and normally, when inspired by an idea at least in research = cycles it is considered basic courtesy to refer to the according source, so= mething has been lost more and more in IETF over time I dare to observe whi= ch in itself reflects on the community IMO) but please do not try to compar= e the two beyond that.
[WAJ] PUA has no= relation with RIFT. I have not yet study what=E2=80=99s problem it encount= ered, but welcome the experts have such design experience to point out the = pitfall that PUA can bypass.


aha, ok, I just chimed in because I saw people somehow implying a map of = RIFT negative disaggregation in relation to this work but if this is a comp= letely different mechanism than I just watch from the sidelines
<= br>
thanks

-- tony
=
--00000000000061f57c05b48fec53-- From nobody Fri Nov 20 13:02:49 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C0B303A00D8 for ; Fri, 20 Nov 2020 13:02:47 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.097 X-Spam-Level: X-Spam-Status: No, score=-2.097 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id z4xtJL7VQuSZ for ; Fri, 20 Nov 2020 13:02:46 -0800 (PST) Received: from mail-io1-xd31.google.com (mail-io1-xd31.google.com [IPv6:2607:f8b0:4864:20::d31]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 01D793A00C9 for ; Fri, 20 Nov 2020 13:02:45 -0800 (PST) Received: by mail-io1-xd31.google.com with SMTP id o8so2907845ioh.0 for ; Fri, 20 Nov 2020 13:02:45 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=NXWdiu3pGeR/c/qA0DsB3vzaDqTYJRGOgreUCLV6YNQ=; b=U8MhftCUFPsbBIQLTiUu4PDS3JksjE9dlfjNeDo7vyYOBtjCuBFNhuLNBycj9m7xCz Li5IrRMfxk0vdhtZFIR+/xZay6uEy53ExxupN5g0upFfD0i6fsf27iRLl36S7zNnyPxl +oph59mPo9w1EBdaek1OXHidO9r28TAV4deUlgfBCm/CNhq1X/d+vevufV87ZbHcsUsb xrgOnhwh8OqqNRf/bEPgaUrHOYxQABlkSjAjl6feVS75LHBRuidSYnOKIblVDk+vcNNI 1KmXQWdrsxhySJe4Emq1vMY4ENyIvtvMaHFcoUfbSkCeNVI4NrqkMpIs58SqEps0iZb6 4arA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=NXWdiu3pGeR/c/qA0DsB3vzaDqTYJRGOgreUCLV6YNQ=; b=t5RUyHP2cRt6r8tIbtaYYMNQM8asNZiyhUx7KUoJWPEow/Cr4zzmJkLIMVHsftGEGb tDlylxFnBrneFOwBgxtJRCipJKsIY52JQWD2vSm9Ec7cOxpeQEbYlAIfcMCpp2pxa+dB oF6Ad1Mhn6KhsSrkizzFlpZmtzVqdTEkzgfXfMFnvPjAFMQWOTZ6uNSY9K1qyrdfavd2 wKHq4WQkMSxGl7qlzvc1arCm6gvRbOihdJVeXkmDDnEpfqy8cQjt+0vQIW3ZChq0kLPd tWKEG2o5U124YH5CV3fjb7BRmFyziIP2csQ8YdVcmsZnabe3X6kgrK0Xnq5qeL9rbXQe 1wSA== X-Gm-Message-State: AOAM530AahlO6/Kp0zzWy4nhbnpdFxjTzpC1ZXV8wzmVPX1H5kfIUFy1 GP/yhY20/z5Q/sF05log41viwQKROz9hNRbbrI4= X-Google-Smtp-Source: ABdhPJwY/35ux5iQ8GJ3pnrINgVyQiznLgq7jvW+yxrSnBY26sVIpF2aD6GxCAtv+rXPF1781xFr720bQ1YOgmoc2wM= X-Received: by 2002:a6b:6c01:: with SMTP id a1mr26881263ioh.31.1605906165259; Fri, 20 Nov 2020 13:02:45 -0800 (PST) MIME-Version: 1.0 References: <8384F1B4-7AB2-4951-BAEA-3FC02A0ADDBD@tsinghua.org.cn> In-Reply-To: From: Tony Przygienda Date: Fri, 20 Nov 2020 13:02:08 -0800 Message-ID: To: Robert Raszuk Cc: Aijun Wang , lsr , Jeff Tantsura , "Acee Lindem (acee)" Content-Type: multipart/alternative; boundary="00000000000085e26705b4902a45" Archived-At: Subject: Re: [Lsr] Prefix Unreachable Announcement Use Cases X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 20 Nov 2020 21:02:48 -0000 --00000000000085e26705b4902a45 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Yeah, so to give e'one his due, negative disaggregation is Pascal's brilliant brain-child, I bow to this. And I bow to his patience grinding me down to convince me the complexity of it is by far outweighted by elegance it brings to ugly failure repair. Then it took a lot of brow-beating until e'one on RIFT understood that no, we will not get negative entry silicon and hence need to remap negative to proper resolution as positive. Not the simplest things but once you implemented it it turns out simpler than it looks @ first my 2c, I'll be watching here from a distance probably until it gelled a bit more -- tony On Fri, Nov 20, 2020 at 12:45 PM Robert Raszuk wrote: > Hey Tony, > > > people somehow implying a map of RIFT negative disaggregation in > relation to this work > > I think those people just made a subtle point that considering IGP alone > if you want to influence your data plane forwarding by advertising PUA in > today's hardware you really need to install more specific blocks of the > summary routes which PUA punched the hole in as sent by say one of the > ABR's. Analogy made to RIFT was just limited to this data plane fragment > only. > > And that comment was not to compare PUA to RIFT negative routing in any > way. It was just to a) realize what could be required if such a use case > continues and more importantly b) highlight that if we just use PUA in th= e > control plane to for example invalidate BGP next hops or other overlay > service routes the disaggregation piece does not apply. > > Cheers, > R. > > > > > > On Fri, Nov 20, 2020 at 9:09 PM Tony Przygienda > wrote: > >> >> >> On Fri, Nov 20, 2020 at 6:27 AM Aijun Wang >> wrote: >> >>> Hi, Tony: >>> >>> Aijun Wang >>> China Telecom >>> >>> On Nov 20, 2020, at 17:45, Tony Przygienda wrote: >>> >>> =EF=BB=BF >>> Yes, acknowledging the idea of negative disaggregation is inspired by >>> RIFT work is fine (and normally, when inspired by an idea at least in >>> research cycles it is considered basic courtesy to refer to the accordi= ng >>> source, something has been lost more and more in IETF over time I dare = to >>> observe which in itself reflects on the community IMO) but please do no= t >>> try to compare the two beyond that. >>> >>> [WAJ] PUA has no relation with RIFT. I have not yet study what=E2=80=99= s problem >>> it encountered, but welcome the experts have such design experience to >>> point out the pitfall that PUA can bypass. >>> >>> >> aha, ok, I just chimed in because I saw people somehow implying a map of >> RIFT negative disaggregation in relation to this work but if this is a >> completely different mechanism than I just watch from the sidelines >> >> thanks >> >> -- tony >> > --00000000000085e26705b4902a45 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Yeah, so to give e'one his due, negative disaggre= gation is Pascal's brilliant brain-child, I bow to this. And I bow to h= is patience grinding me down to convince me the complexity of it is by far = outweighted by elegance it brings to ugly failure repair. Then it took a lo= t of brow-beating until e'one on RIFT understood that no, we will not g= et negative entry silicon and hence need to remap negative to proper resolu= tion as positive. Not the simplest things but once you implemented it it tu= rns out simpler than it looks @ first

my 2c, I'= ;ll be watching here from a distance probably until it gelled a bit more

-- tony

On Fri, Nov 20, 2020 at 12:45 = PM Robert Raszuk <robert@raszuk.net= > wrote:
=
Hey Tony,

>=C2=A0 people somehow imp= lying a map of RIFT negative disaggregation in relation to this work=C2=A0= =C2=A0

I think those people just made a subtle= point that considering IGP alone if you want to influence your data plane = forwarding by advertising=C2=A0PUA in today's hardware you really need = to install more specific blocks of the summary routes which PUA punched the= hole in as sent by say one of the ABR's. Analogy made to RIFT was just= limited to this data plane fragment only.=C2=A0

A= nd that comment was not to compare PUA to RIFT negative routing in any way.= It was just to a) realize what could be required if such a use case contin= ues and more importantly b) highlight that if we just use PUA in the contro= l plane to for example invalidate BGP next hops or other overlay service ro= utes the disaggregation piece does not apply.=C2=A0

Cheers,
R.





On Fri, Nov 20, 2020 at 9:09 PM Tony Przygienda <tonysietf@gmail.com> = wrote:


On Fri, Nov 20, 2020 at 6:27 AM Aijun Wang &l= t;wangaijun@= tsinghua.org.cn> wrote:
Hi, Tony:

Aijun Wa= ng
China Telecom

On Nov 20, 2020, at 17:45, Tony Przygienda <tonysietf@gmail.com> wrote:

=
=EF=BB=BF
Yes, acknowledging the idea of negative disaggregation is= inspired by RIFT work is fine (and normally, when inspired by an idea at l= east in research cycles it is considered basic courtesy to refer to the acc= ording source, something has been lost more and more in IETF over time I da= re to observe which in itself reflects on the community IMO) but please do = not try to compare the two beyond that.
[WAJ] PUA has no relation with RIFT. I have not yet study what=E2=80=99s p= roblem it encountered, but welcome the experts have such design experience = to point out the pitfall that PUA can bypass.

<= div>
aha, ok, I just chimed in because I saw people somehow i= mplying a map of RIFT negative disaggregation in relation to this work but = if this is a completely different mechanism than I just watch from the side= lines

thanks

-- tony=
--00000000000085e26705b4902a45-- From nobody Fri Nov 20 13:10:55 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3D6933A03FA; Fri, 20 Nov 2020 13:10:47 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.087 X-Spam-Level: X-Spam-Status: No, score=-2.087 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_REMOTE_IMAGE=0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id OMKalITUndVT; Fri, 20 Nov 2020 13:10:44 -0800 (PST) Received: from mail-pg1-x535.google.com (mail-pg1-x535.google.com [IPv6:2607:f8b0:4864:20::535]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 15F5B3A03F8; Fri, 20 Nov 2020 13:10:43 -0800 (PST) Received: by mail-pg1-x535.google.com with SMTP id t37so8288433pga.7; Fri, 20 Nov 2020 13:10:43 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=HVqPPl4GuzSQxU7gwyD0TqLs2eYORVqviHayiFj0arY=; b=ZvFfHichZ+LAoNwtkXuT2vfjPEHWZPHCosuDJyXeQZQZP0g5dNRxQnCmK4bU5pcQIy +N7aM10+5a6mBIpWgPaNhL8pfyQgIxiG3yNQF/Pv3uwaubEFR+br+DKO5Bjt6nWkpFcG 0IwWfZ/vxuIBvujmwHWam0md2zy8yPAOvEMbubqn77V+ExyoH4U6VA0vVcnNBcVFexcE dttpjp4z9EhOMX5YbL93tArm+7KxB+nCUc4O3yYrXaaT3mqLGG9899zDW3sOfwXSt1/N u6xIxoPkcuN0VCcj2RiUmFsgB1I4ulmeDv7IV4KeAiJMwUj60xq6/0DbqiyqZeCLlDR1 KhFA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=HVqPPl4GuzSQxU7gwyD0TqLs2eYORVqviHayiFj0arY=; b=gtLzEDwYJdrwVY8S9MSdaTNxONzrdstxkAle9pCvp+vXvhNlh6JWQ+TbgmFPyXem0E vBBS+ACs13i1YmZfBoEnfJW9SKUFbw7Wqx6P1SvO1ABb/V2g0293gQ1PWYqJaOqP3+DG sxs4nIdRYyC1LxXcHOTINZi5Pb5rfImkTfz1KrneoBd36X10glhKB3rnpOh0saS0pOHH nnxkxxL18flNcmqMSfhNtCZjbr8K4KzLXG3fSQ+jD7F3aLXB3dMc/Z8Cq1cvaGXCxme9 ioSsR2kwo4B18VQs+R03AzawQEbf+3iUNO4iiJOs3Xuf8TkrnUhts1U3f8nXCsGM26hq QTcg== X-Gm-Message-State: AOAM531DmGVjWmp/KAO6HtOcAP4Jn9VBXiy0q2p6vNguPR7GQUyZRgJf ThaAU9UOGjROpuKygdqopMb/ODZaM3xxsUeovyNqmQCZwNk= X-Google-Smtp-Source: ABdhPJzwwWXkS/rFf4J7op5wJTVaMEuWkqOiHnwKeT7TGJ7y8e2meuT9G8SMb/AbeNls1rACgw1goGDcVdfL/wIZITQ= X-Received: by 2002:a65:56c8:: with SMTP id w8mr18687502pgs.383.1605906643271; Fri, 20 Nov 2020 13:10:43 -0800 (PST) MIME-Version: 1.0 References: <00d501d6bb47$7ee160a0$7ca421e0$@olddog.co.uk> In-Reply-To: <00d501d6bb47$7ee160a0$7ca421e0$@olddog.co.uk> From: Gyan Mishra Date: Fri, 20 Nov 2020 16:10:32 -0500 Message-ID: To: adrian@olddog.co.uk Cc: BESS , BIER WG , IDR List , SPRING WG , TEAS WG , lsr , pce@ietf.org Content-Type: multipart/alternative; boundary="00000000000003c42c05b490476d" Archived-At: Subject: Re: [Lsr] [Bier] PCE Controller & SDN Controller & Netconf/Yang NMS Controller - lines blurred and can the names be used ubiquitously meaning the same X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 20 Nov 2020 21:10:47 -0000 --00000000000003c42c05b490476d Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi Adrian, In line Kind Regards Gyan On Sun, Nov 15, 2020 at 7:04 AM Adrian Farrel wrote: > Hi Gyan, > > > > Sorry, I missed this (got caught on a filter cos it was a bit spammed to = a > lot of lists :-). > > > > > I have noticed that after reviewing many drafts across many WGs it seem= s > in the > > > industry that the lines seem to be blurred between a PCE controller, OD= L > or > > > Openflow SDN Controller and a Netconf/Yang NMS Controller ZTP & Day X > > > provisioning. > > > > Yes, blurriness our speciality. > > Gyan> :) > > You my find RFC 7491 useful in this respect, although it is a little > dated. And, of course, RFC 8283 is a good starting point. > > Gyan> Thanks > > As this is a software sitting on a server you can have a swiss army knife > server that > > > does everything from PCE path computation to Netconf/Yang ZTP & Day N > > > provisioning as well as any SDN Controller ODL or Openflow controller > type > > > functions as well. > > > > Yes, and this is one of the risks of PCE as a shiny thing: that it be > converted from a useful toolkit into some form of god-box. I pontificated > on this way back in 2014 at http://www.olddog.co.uk/PCEPandOnwards.pdf > > Gyan> My sentiments exactly - With that power at your fingertips comes > responsibility. > > How this comes into play and realization of the lines being blurred is > the use of > > > BGP-LS in building the IGP topological graph of the network which was > designed > > > for PCEP and PCE & PCC active & passive off line path computation for > both > > > RSVP-TE or SR-TE path instantiation. > > > > In some senses, BGP-LS didn=E2=80=99t add anything because a PCE could ha= ve > snooped on the IGP. But BGP-LS provides an export mechanism and important= ly > adds to that some policy filters to determine what is exported thus givin= g > the network some control over what is exported. > > Gyan> Agreed > > FWIW, https://datatracker.ietf.org/doc/draft-dhodylee-pce-pcep-ls/ > proposes using PCEP for the same function. The argument in favor is that = a > PCE has to implement PCEP anyway, so why not include the LS export as wel= l. > The argument against is that BGP-LS has wider applicability and that it > will typically be exported from an ASBR which already supports BGP. > > Gyan> Makes sense and in some ways cuts out the middle man BGP-LS > overloading burden on BGP. Great idea. I like it. Another very valuabl= e > tool in the operators toolbox. > > > However now BGP-LS can also be used for other functions now such as > usage as > > > I am a Shepherd reviewing a draft for BGP-LS usage for BIER to use > BGP-LS to > > > gather the elements internals within BIER using the same BGP-LS data > structures > > > to populate with BIER specific information to graph the BIER topology. > So here > > > we are not doing any path computations as we are using in this use case > for > > > NMS type function to gather data for ZTP & Day N provisioning. > > > > > > Similarly other use cases such as with TEAS TS-Transport slice and bein= g > able > > > to provision TS and capturing the TS Enhanced VPN RT & resource > information > > > and leveraging BGP-LS to do the same data gathering & ZTP like > controller style > > > provisioning. > > > > Is there a fundamental difference between ZTP & Day N provisioning and > path computation for traffic engineering provisioning? It=E2=80=99s all d= etermining > how to configure the network to best carry traffic. > > > Gyan> In my mind the fundamental difference would be TE - control plane TEDs and forwarding plane routing action path computation and instantiation of path action as compare to a NMS type Netconf/Yang configuration snippet push function not routing or TE related. > > It does seem as though BGP-LS as its a means of "data gathering" "dump > truck" > > > of anything with the kitchen sink included to build any type of > topological graph > > > of literally anything under the sun. > > > > Remembering Yakov Rekhter saying you could use BGP to transport > Shakespeare. > > This is a tension with any protocol BGP-LS, PCEP, etc., etc. Stuff gets > added, further use gets made. > > Gyan> Understood > > BGP-LS was intended to export routing information =E2=80=9Cnorthbound=E2= =80=9D from the > network. > > Gyan> Understood > > > I see that is a nice to leverage but it does in fact blur the lines of > NMS Netconf/Yang > > > Controller based functionality and PCE path computation functionality > and SDN > > > controller based ZTP functionality into a single ubiquitous server that > can do all of > > > the above and use BGP-LS to accomplish the "kitchen sink" tasks. It > does however > > > transform BGP to be an NMS tool but a "tool" and not just the original > function > > > which it was intended NLRI network reachability. > > > > Not sure that BGP-LS is BGP. But I agree that BGP-LS is =E2=80=9Can NMS t= ool=E2=80=9D. > > I might argue that BGP distributing policies from installation on PEs is > an NMS protocol. > > Gyan> Agreed. One way to look at it is that as BGP primary function is > routing, however there many code points that are not necessarily routing > related , and BGP provides the ability to have each code point or SAFI or > parameters as a discrete container - to be enabled as desired, however wi= th > that flexibility not all containers have to be used by the operator. So > the operator can custom tailor what SAFI, codepoint or parameters are > required for the implementation per design requirements and only enable > those that are necessary. So that would of course be the case for BGP-LS= . > So in that case BGP can be utilized for routing or as an NMS tool extendi= ng > Netconf/Yang via BGP-LS or any other function that requires import of dat= a > structures. And that=E2=80=99s Ok. > > Am I off base and please let me know as its BGP-LS is being way over > leveraged. > > > There are pros & cons to everything but I thought I would bring up to > the WG as > > > an important discussion point. > > > > Who are we to argue with real implementations? Assuming that there is a > push for implementation and deployment, then the thing to look for is > =E2=80=9Charm=E2=80=9D. Does this use of BGP-LS cause harm, sow confusion= , risk > destabilising the network? Should it use a different code point to be > distinguishable? > > Gyan> Completely agree. I agree negative impact if any exist. See my > comments above. As BGP has the ability to compartmentalize SAFI, > codepoints and parameters into containers to be used discretely for > specific use cases tailored to the operators need. So it may feel that we > are throwing the kitchen sink at BGP and as that may not have been the > intention way back but as BGP is customizable BGP can truly be a ubiquito= us > tool in the operators toolbox. > > I think the argument that =E2=80=9Cthere is already another protocol for = doing > this=E2=80=9D is worth examining. But we have to be careful that it doesn= =E2=80=99t get us > stuck, or force everyone to do something they don=E2=80=99t want to do. A= fter all, > we could carry any protocol message using Netconf/YANG, but we don=E2=80= =99t do > =E2=80=9CRSVP-TE over Netconf=E2=80=9D. > Gyan> Agreed Many thanks for your feedback! > > > Best, > > Adrian > > > --=20 *Gyan Mishra* *Network Solutions A**rchitect * *M 301 502-134713101 Columbia Pike *Silver Spring, MD --00000000000003c42c05b490476d Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

Hi Adrian,

In line=C2=A0

Kind Regards=C2=A0

Gyan
On Sun, Nov 15, 2020 at 7:04 AM Adrian Farrel <adrian@olddog.co.uk> wrote:
=

Hi Gyan,

=C2=A0

Sorry, I missed this (got caught on a filter cos it was a bit spammed to a= lot of lists :-).

= =C2=A0

> I have no= ticed that after reviewing many drafts across many WGs it seems in the

> industry that the lines seem to be= blurred between a PCE controller, ODL or

> Openflow SDN Controller and a Netconf/Yang NMS Controller ZTP &= amp; Day X

> provisioning.

=C2=A0

Yes, blurriness our speciality.

=C2=A0Gyan> :)

= You my find RFC 7491 useful in this respect, although it is a little dated.= And, of course, RFC 8283 is a good starting point.

=C2=A0Gyan> Thanks=C2=A0

<= /div>

<= u>

> As this is a software sitt= ing on a server you can have a swiss army knife server that

> does everything from PCE path computation to= =C2=A0 Netconf/Yang ZTP & Day N

> provisioning as well as any SDN Controller ODL or Openflow controlle= r type

> functions as well.

=C2=A0

Yes, and this is one of the risks of PCE as a shiny thing: that it = be converted from a useful toolkit into some form of god-box. I pontificate= d on this way back in 2014 at http://www.olddog.co.uk/PCEPandOnwards.pdf<= u>

=C2=A0Gyan> = My sentiments exactly - With that power at your fingertips comes responsibi= lity. =C2=A0

> How= this comes into play and realization of the lines being blurred is the use= of

> BGP-LS in building the IGP= topological graph of the network which was designed

> for PCEP and PCE & PCC active & passive off = line path computation for both

>= RSVP-TE or SR-TE path instantiation.=C2=A0=C2=A0

=C2=A0

In some sense= s, BGP-LS didn=E2=80=99t add anything because a PCE could have snooped on t= he IGP. But BGP-LS provides an export mechanism and importantly adds to tha= t some policy filters to determine what is exported thus giving the network= some control over what is exported.

=C2=A0Gyan> Agreed=C2=A0

FWIW, https://datatracker.ietf.org/doc/draft-dhodyl= ee-pce-pcep-ls/ proposes using PCEP for the same function. The argument= in favor is that a PCE has to implement PCEP anyway, so why not include th= e LS export as well. The argument against is that BGP-LS has wider applicab= ility and that it will typically be exported from an ASBR which already sup= ports BGP.

=C2= =A0Gyan> Makes sense and in some ways cuts out the middle man BGP-LS ove= rloading burden on BGP.=C2=A0 Great idea.=C2=A0 I like it.=C2=A0 Another ve= ry valuable tool in the operators toolbox.

> However now BGP-LS can also be used for other functions no= w such as usage as

> I am a Shep= herd reviewing a draft for BGP-LS usage for BIER to use BGP-LS to=

> gather the elements internals within BI= ER using the same BGP-LS data structures

> to populate with BIER specific information to graph the BIER top= ology.=C2=A0 So here

> we are no= t doing any path computations as we are using in this use case=C2=A0 for=

> NMS type function to gather data= for ZTP & Day N provisioning.

>=C2=A0

&g= t; Similarly other use cases such as with TEAS TS-Transport slice and being= able

> to provision TS and capt= uring the TS Enhanced VPN RT & resource information

> and leveraging BGP-LS to do the same data gatheri= ng & ZTP like controller style

= > provisioning.=C2=A0

=C2=A0

Is there a fundamental diff= erence between ZTP & Day N provisioning and path computation for traffi= c engineering provisioning? It=E2=80=99s all determining how to configure t= he network to best carry traffic.

<= u>=C2=A0

=C2= =A0 =C2=A0Gyan> In my mind the fundamental difference would be TE - cont= rol plane TEDs and forwarding plane routing action path computation and ins= tantiation of path action as compare to a NMS type Netconf/Yang configurati= on snippet push function not routing or TE related.
=

&g= t; It does seem as though BGP-LS as its a means of "data gathering&quo= t; "dump truck"

> of a= nything with the kitchen sink included to build any type of topological gra= ph

> of literally anything under= the sun.

=C2=A0

<= p class=3D"MsoNormal">Remembering Yakov Rekhter saying you could use BGP to= transport Shakespeare.

This is a = tension with any protocol BGP-LS, PCEP, etc., etc. Stuff gets added, furthe= r use gets made.

=C2=A0Gyan> Understood=C2=A0

BGP-LS w= as intended to export routing information =E2=80=9Cnorthbound=E2=80=9D from= the network.

= =C2=A0Gyan> Understood=C2=A0

>=C2=A0= I see that is a nice to leverage but it does in fact blur the lines of NMS = Netconf/Yang

> Controller based = functionality and=C2=A0 PCE path computation functionality and SDN

> controller based ZTP functionality int= o a single ubiquitous server that can do all of

> the above and use BGP-LS to accomplish the "kitche= n sink" tasks.=C2=A0 It does however

> transform BGP to be an NMS tool but a "tool" and not = just the original function

> whi= ch it was intended NLRI network reachability.

=C2=A0

Not sure that BGP= -LS is BGP. But I agree that BGP-LS is =E2=80=9Can NMS tool=E2=80=9D.

I might argue that BGP distributing poli= cies from installation on PEs is an NMS protocol.

=C2=A0Gyan> Agreed.= =C2=A0 One way to look at it is that as BGP primary function is routing, ho= wever there many code points that are not necessarily routing related , and= BGP provides the ability to have each code point or SAFI or parameters as = a discrete container - to be enabled as desired, however with that flexibil= ity not all containers have to be used by the operator.=C2=A0 So the operat= or can custom tailor what SAFI, codepoint or parameters are required for th= e implementation per design requirements and only enable those that are nec= essary.=C2=A0 So that would of course be the case for BGP-LS.=C2=A0 So in t= hat case BGP can be utilized for routing or as an NMS tool extending Netcon= f/Yang via BGP-LS or any other function that requires import of data struct= ures. =C2=A0 And that=E2=80=99s Ok.=C2=A0

=

> Am I off base and please let me know a= s its BGP-LS is being way over leveraged.=C2=A0

> There are pros & cons to everything but I thought I= would bring up to the WG as

> a= n important discussion point.

=C2=A0

Who are we to argue with real imp= lementations? Assuming that there is a push for implementation and deployme= nt, then the thing to look for is =E2=80=9Charm=E2=80=9D. Does this use of = BGP-LS cause harm, sow confusion, risk destabilising the network? Should it= use a different code point to be distinguishable?

Gyan> Completely agree.=C2=A0 I agre= e negative impact if any exist.=C2=A0 See my comments above.=C2=A0 As BGP h= as the ability to compartmentalize SAFI, codepoints and parameters into con= tainers to be used discretely for specific use cases tailored to the operat= ors need. So it may feel that we are throwing the kitchen sink at BGP and a= s that may not have been the intention way back but as BGP is customizable = BGP can truly be a ubiquitous tool in the operators toolbox.

I think the argument that =E2=80=9Cthere is already anot= her protocol for doing this=E2=80=9D is worth examining. But we have to be = careful that it doesn=E2=80=99t get us stuck, or force everyone to do somet= hing they don=E2=80=99t want to do. After all, we could carry any protocol = message using Netconf/YANG, but we don=E2=80=99t do =E2=80=9CRSVP-TE over N= etconf=E2=80=9D.


=C2=A0 =C2=A0Gyan> Agreed

Many thanks for your feedback!
=
=

=C2=A0

Best,

Adrian

=C2=A0

<= /div>
--


Gyan Mishra

Network Solutions Architect=C2=A0

<= i>M 301 502-1347
13101 Columbia Pike=C2=A0=
Silver Spring, MD


=
--00000000000003c42c05b490476d-- From nobody Sat Nov 21 07:47:18 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1EE063A0DED; Sat, 21 Nov 2020 07:47:05 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.895 X-Spam-Level: X-Spam-Status: No, score=-1.895 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_NONE=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 7a_VHaktI76Q; Sat, 21 Nov 2020 07:47:03 -0800 (PST) Received: from mta7.iomartmail.com (mta7.iomartmail.com [62.128.193.157]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 9599A3A0E33; Sat, 21 Nov 2020 07:46:58 -0800 (PST) Received: from vs3.iomartmail.com (vs3.iomartmail.com [10.12.10.124]) by mta7.iomartmail.com (8.14.4/8.14.4) with ESMTP id 0ALFkssH025045; Sat, 21 Nov 2020 15:46:55 GMT Received: from vs3.iomartmail.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id C2BF62203A; Sat, 21 Nov 2020 15:46:54 +0000 (GMT) Received: from asmtp2.iomartmail.com (unknown [10.12.10.249]) by vs3.iomartmail.com (Postfix) with ESMTPS id AD19722032; Sat, 21 Nov 2020 15:46:54 +0000 (GMT) Received: from LAPTOPK7AS653V ([195.166.134.90]) (authenticated bits=0) by asmtp2.iomartmail.com (8.14.4/8.14.4) with ESMTP id 0ALFkroZ020064 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Sat, 21 Nov 2020 15:46:54 GMT Reply-To: From: "Adrian Farrel" To: "'Gyan Mishra'" Cc: "'BESS'" , "'BIER WG'" , "'IDR List'" , "'SPRING WG'" , "'TEAS WG'" , "'lsr'" , References: <00d501d6bb47$7ee160a0$7ca421e0$@olddog.co.uk> In-Reply-To: Date: Sat, 21 Nov 2020 15:46:53 -0000 Organization: Old Dog Consulting Message-ID: <039401d6c01d$893ded90$9bb9c8b0$@olddog.co.uk> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0395_01D6C01D.893E62C0" X-Mailer: Microsoft Outlook 16.0 Thread-Index: AQF9YbXHIOSWBk8yeY9fu/naMBX0BwJnuPwTAbmwFjqqZGg3wA== Content-Language: en-gb X-Originating-IP: 195.166.134.90 X-Thinkmail-Auth: adrian@olddog.co.uk X-TM-AS-GCONF: 00 X-TM-AS-Product-Ver: IMSVA-9.0.0.1623-8.2.0.1013-25804.001 X-TM-AS-Result: No--19.728-10.0-31-10 X-imss-scan-details: No--19.728-10.0-31-10 X-TMASE-Version: IMSVA-9.0.0.1623-8.2.1013-25804.001 X-TMASE-Result: 10--19.728200-10.000000 X-TMASE-MatchedRID: TmlY9+XBoTmx4Q5iE/G4VXFPUrVDm6jth4A8KRmrGe2qvcIF1TcLYEwi cw3eWSo0YLQ3+9wW9SYaHpAEsECl+h0HHInBeaK9JOMhINYq80wHgh3sKJBzP8pj/9aYiP+h3SZ uwROk0qHmLM5grIF7CSLuZAk1qAxOehY/DCk+INGecgASc+pqBczdhaN37iAM5lhx0mBJyPEcUn IIyt02Sa9sD66wAjsxf6x5zoWNtEgpNfI+R65HNc50DGuIExk9fiA7Y+GFqDOsaBVGMabQl+//v bMLiEkVS23jFwoI7b1+1uW3cIJ1vBWVVkGuW6Jr3zSg/bkXzGmOz/LLJUcaHsmqrXFLFjsW6aX8 TYIrj1uFZCZln65Hjpt6E4YKOIuohfUatHkEWNT4Wr1WT+bU2pkShYcLpGH9dPj9LUBj/ks8Pun 5tcXDXI0id0pIhqxT48CdlKt5w6+7Cjv/4LgPYmhQCsqhuTNihlL5/PVMMhK+vSKPcZwFluCfwd Xr9Uztu7C4hieFwVKAMuqetGVettLvsKjhs0lda9+JVKonO7eLZAVphLW/bXkguuQorcgMg5IQ3 dbS17M+Pal/bipFlwhigbA7cP7I6E96vWKSeR9+3BndfXUhXQ== X-TMASE-SNAP-Result: 1.821001.0001-0-1-12:0,22:0,33:0,34:0-0 Archived-At: Subject: Re: [Lsr] [Bier] PCE Controller & SDN Controller & Netconf/Yang NMS Controller - lines blurred and can the names be used ubiquitously meaning the same X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 21 Nov 2020 15:47:05 -0000 This is a multipart message in MIME format. ------=_NextPart_000_0395_01D6C01D.893E62C0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Hi again Gyan, =20 I think we=E2=80=99re narrowing down and getting somewhat esoteric for = the mailing lists we=E2=80=99re spamming. > Similarly other use cases such as with TEAS TS-Transport slice and = being able > to provision TS and capturing the TS Enhanced VPN RT & resource = information > and leveraging BGP-LS to do the same data gathering & ZTP like = controller style > provisioning.=20 Is there a fundamental difference between ZTP & Day N provisioning and = path computation for traffic engineering provisioning? It=E2=80=99s all = determining how to configure the network to best carry traffic.=20 Gyan> In my mind the fundamental difference would be TE - control plane = TEDs and forwarding plane routing action path computation and instantiation of = path action as compare to a NMS type Netconf/Yang configuration snippet push = function not routing or TE related. =20 [Adrian] I think it depends. The protocols are just tools. You could = have a centralised TE system with a PCE to preform computations, but you = can use any combinations of protocols to extract information from the = network (IGPs, BGP-LS, PCEP-LS, Netconf, =E2=80=A6) and any combination = of protocols to program the network devices to install TE paths, reserve = resources, and configure traffic forwarding rules (PCEP, RSVP-TE, = Netconf, =E2=80=A6). =20 Cheers, Adrian ------=_NextPart_000_0395_01D6C01D.893E62C0 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable

Hi again = Gyan,

 

I think = we=E2=80=99re narrowing down and getting somewhat esoteric for the = mailing lists we=E2=80=99re = spamming.

> = Similarly other use cases such as with TEAS TS-Transport slice and being = able
> to provision TS and capturing the TS Enhanced VPN RT & = resource information
> and leveraging BGP-LS to do the same data = gathering & ZTP like controller style
> = provisioning. 

Is there a = fundamental difference between ZTP & Day N provisioning and path = computation for traffic engineering provisioning? It=E2=80=99s all = determining how to configure the network to best carry = traffic. 

Gyan> In my mind the fundamental difference would = be TE - control plane TEDs and
forwarding plane routing action path = computation and instantiation of path action
as compare to a NMS type = Netconf/Yang configuration snippet push function not
routing or TE = related.

 

[Adrian] I think it depends. The protocols are just = tools. You could have a centralised TE system with a PCE to preform = computations, but you can use any combinations of protocols to extract = information from the network (IGPs, BGP-LS, PCEP-LS, Netconf, =E2=80=A6) = and any combination of protocols to program the network devices to = install TE paths, reserve resources, and configure traffic forwarding = rules (PCEP, RSVP-TE, Netconf, =E2=80=A6).

 

Cheers,

Adrian

------=_NextPart_000_0395_01D6C01D.893E62C0-- From nobody Sun Nov 22 18:16:39 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 2BC4C3A1193 for ; Sun, 22 Nov 2020 18:16:38 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.018 X-Spam-Level: X-Spam-Status: No, score=-0.018 tagged_above=-999 required=5 tests=[HTML_MESSAGE=0.001, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=unavailable autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id VSeUT0B0BjZd for ; Sun, 22 Nov 2020 18:16:35 -0800 (PST) Received: from mail-m127101.qiye.163.com (mail-m127101.qiye.163.com [115.236.127.101]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id A3D8D3A1190 for ; Sun, 22 Nov 2020 18:16:33 -0800 (PST) Received: from DESKTOP2IOH5QC (unknown [219.142.69.75]) by mail-m127101.qiye.163.com (Hmail) with ESMTPA id E506C464FA; Mon, 23 Nov 2020 10:16:29 +0800 (CST) From: "Aijun Wang" To: "'Acee Lindem \(acee\)'" , References: In-Reply-To: Date: Mon, 23 Nov 2020 10:16:29 +0800 Message-ID: <027a01d6c13e$a77c90a0$f675b1e0$@tsinghua.org.cn> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_027B_01D6C181.B5A28FC0" X-Mailer: Microsoft Outlook 16.0 Content-Language: zh-cn Thread-Index: AQKq2FPt3V92fdCk9g2m1GkCJjgB1agsyK2g X-HM-Spam-Status: e1kfGhgUHx5ZQUtXWQgYFAkeWUFZS1VLWVdZKFlBSkxLS0o3V1ktWUFJV1 kPCRoVCBIfWUFZTUIdTB9MH09MGktNVkpNS01LQkxMQktKSklVEwETFhoSFyQUDg9ZV1kWGg8SFR 0UWUFZT0tIVUpKS09ISFVLWQY+ X-HM-Sender-Digest: e1kMHhlZQR0aFwgeV1kSHx4VD1lBWUc6MEk6KBw*ED8eEQE2PDctLT08 MDowFChVSlVKTUtNS0JMTEJLTUlCVTMWGhIXVQwaFRwaEhEOFTsPCBIVHBMOGlUUCRxVGBVFWVdZ EgtZQVlJSkJVSk9JVU1CVUxOWVdZCAFZQUlNTEJDNwY+ X-HM-Tid: 0a75f2e3643a9865kuuue506c464fa Archived-At: Subject: Re: [Lsr] Responses for comments on "passive interface attribute" draft X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 23 Nov 2020 02:16:38 -0000 This is a multipart message in MIME format. ------=_NextPart_000_027B_01D6C181.B5A28FC0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Hi, Acee: =20 Stub-link is actually the special part of the IGP topology information. = It must be taken into consideration when we done inter-as work, for = example, inter-as topology retrieval, or inter-as TE etc. Current solutions for such scenarios require tedious configuration on = each boundary interface.=20 With the help of central controller and the information that provided by = the stub-link, it is easy to reconstruct the inter-as topology, steering = the traffic to the right boundary interface. The routers within the IGP = domain can also select the right nexthop to arrive the server that = attached to the stub-link. We have ignored the usage of the stub-link for long time, is it the time = to shine it then? =20 =20 Best Regards =20 Aijun Wang China Telecom =20 From: lsr-bounces@ietf.org On Behalf Of Acee = Lindem (acee) Sent: Friday, November 20, 2020 3:36 PM To: Aijun Wang ; lsr@ietf.org Subject: [Lsr] Responses for comments on "passive interface attribute" = draft =20 Speaking as WG member and updating subject: =20 Hi Aijun,=20 =20 We=E2=80=99re not going to add stub links back into Router-LSAs under = any circumstance since that was an advantage of OSPFv3 over OSPFv2 = (refer to section 2.8 of RFC 5340). Additionally, we=E2=80=99re going to = be careful as to what information we put into the topological LSAs.=20 =20 With respect to your specific use case, you haven=E2=80=99t disclosed it = other than you=E2=80=99re making some loose inference based on an = interface being a passive interface (which isn=E2=80=99t a standardized = IGP concept). Rather, you should precisely design your use case and then = we can talk about a solution.=20 =20 Thanks, Acee =20 From: Aijun Wang > Date: Thursday, November 19, 2020 at 10:06 PM To: Acee Lindem >, "lsr@ietf.org = " > Subject: RE: [Lsr] IETF I09 LSR Meeting Minutes(Responses for comments = on "passive interface attribute" draft) =20 HI, Acee: =20 Thanks for the minutes, and also thanks for Yingzhen.=20 =20 Below are the responses for the comments regarding to = draft-wang-lsr-passive-interface-attribute-06 = , please see whether they address your concern or not. For simplicity, I just summary the key points of the comments. =E3=80=90Chris=E3=80=91: Why not using the existed TLV to solve the = Inter-as use case? =E3=80=90Reply-from Aijun Wang=E3=80=91: For inter-AS use case, using = the existed TLV has the constraints that described in = https://mailarchive.ietf.org/arch/msg/lsr/VLufuaGDiRgaflcu58FY_SHnJ7A/ =20 =E3=80=90Chris=E3=80=91: Why not using prefix attributes to advertise = application server=E2=80=99s information? =E3=80=90Reply-from Aijun Wang=E3=80=91: It is possible to advertise = these information together with prefix. But when we want to describe the = resources(for example, link bandwidth, link utilization ratio etc.) to = the prefix, it is more reasonable to associated them to link attributes. =20 On summary, considering the above two use case has the common = characteristic, that is, the associated link is stub-link, we think that = defines the stub-link TLV to contain the these information is more = extensible. =20 =E3=80=90Acee=E3=80=91: Why not just advertise the link is the inter-AS = boundary or other , and doesn=E2=80=99t need to infer this conclusion?=20 =E3=80=90Reply-from Aijun Wang=E3=80=91: If necessary, we can add one = flag field to indicate clearly the sub-type of the stub-link. But = currently, they are all passive-interface, has no other distinguished = differences. The usage of such information, or the inferences method, may be = different in different scenario. I think the standardization work should = defines the fundamental common parts. =20 =20 Best Regards =20 Aijun Wang China Telecom =20 From: lsr-bounces@ietf.org = > On Behalf Of Acee = Lindem (acee) Sent: Friday, November 20, 2020 6:17 AM To: lsr@ietf.org =20 Subject: [Lsr] IETF I09 LSR Meeting Minutes =20 I have uploaded the minutes for the meeting on Monday morning. Thanks = much to Yingzhen Qu for taking them. Please send me any additions or = corrections to me. =20 https://datatracker.ietf.org/doc/minutes-109-lsr/ =20 Presenters and draft authors, please note that if more discussion is = need on your draft then it is up to you to initiate such discussion.=20 =20 Thanks, Acee ------=_NextPart_000_027B_01D6C181.B5A28FC0 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable

H= i, Acee:

<= o:p> 

S= tub-link is actually the special part of the IGP topology information. = It must be taken into consideration when we done inter-as work, for = example, inter-as topology retrieval, or inter-as TE = etc.

C= urrent solutions for such scenarios require tedious configuration on = each boundary interface.

W= ith the help of central controller and the information that provided by = the stub-link, it is easy to reconstruct the inter-as topology, steering = the traffic to the right boundary interface. The routers within the IGP = domain can also select the right nexthop to arrive the server that = attached to the stub-link.

W= e have ignored the usage of the stub-link for long time, is it the time = to shine it then?

<= o:p> 

<= o:p> 

B= est Regards

<= o:p> 

A= ijun Wang

C= hina Telecom<= o:p>

<= o:p> 

From: lsr-bounces@ietf.org = <lsr-bounces@ietf.org> On Behalf Of Acee Lindem = (acee)
Sent: Friday, November 20, 2020 3:36 PM
To: = Aijun Wang <wangaijun@tsinghua.org.cn>; = lsr@ietf.org
Subject: [Lsr] Responses for comments on = "passive interface attribute" = draft

 

Speaking as WG member and = updating subject:

 

Hi Aijun, =

 

We=E2=80=99re not going to add = stub links back into Router-LSAs under any circumstance since that was = an advantage of OSPFv3 over OSPFv2 (refer to section 2.8 of RFC 5340). = Additionally, we=E2=80=99re going to be careful as to what information = we put into the topological LSAs.

 

With respect to your specific = use case, you haven=E2=80=99t disclosed it other than you=E2=80=99re = making some loose inference based on an interface being a passive = interface  (which isn=E2=80=99t a standardized IGP concept). = Rather, you should precisely design your use case and then we can talk = about a solution.

 

Thanks,

Acee

 

From: Aijun Wang <wangaijun@tsinghua.org.cn&g= t;
Date: Thursday, November 19, 2020 at 10:06 PM
To: = Acee Lindem <acee@cisco.com>, "lsr@ietf.org" <lsr@ietf.org>
Subject: RE: = [Lsr] IETF I09 LSR Meeting Minutes(Responses for comments on = "passive interface attribute" = draft)

 

H= I, Acee:

&= nbsp;

T= hanks for the minutes, and also thanks for Yingzhen.

&= nbsp;

B= elow are the responses for the comments regarding to draft-wang-lsr-passive-interface-attribute-06, = please see whether they address your concern or not.

F= or simplicity, I just summary the key points of the = comments.

=E3= =80=90Chris=E3=80=91: Why = not using the existed TLV to solve the Inter-as use = case?

=E3= =80=90Reply-from Aijun Wang=E3=80=91: For inter-AS use case, using the existed TLV has the = constraints that described in https://mailarchive.ietf.org/arch/msg/lsr/VLufuaGDiRgaflcu58FY_SHn= J7A/

&= nbsp;

=E3= =80=90Chris=E3=80=91: Why = not using prefix attributes to advertise application = server=E2=80=99s = information?

=E3= =80=90Reply-from Aijun Wang=E3=80=91: It is possible to advertise these information together = with prefix. But when we want to describe the resources(for example, = link bandwidth, link utilization ratio etc.) to the prefix, it is more = reasonable to associated them to link attributes.

&= nbsp;

O= n summary, considering the above two use case has the common = characteristic, that is, the associated link is stub-link, we think that = defines the stub-link TLV to contain the these information  is more = extensible.

&= nbsp;

=E3= =80=90Acee=E3=80=91: Why = not just advertise the link is the inter-AS boundary or other , and = doesn=E2=80=99t need to infer this conclusion? =

=E3= =80=90Reply-from Aijun Wang=E3=80=91: If necessary, we can add one flag field to indicate = clearly the sub-type of the stub-link. But currently, they are all = passive-interface, has no other distinguished = differences.

T= he usage of such information, or the inferences method, may be different = in different scenario. I think the standardization work should defines = the fundamental common parts.

&= nbsp;

&= nbsp;

B= est Regards

&= nbsp;

A= ijun Wang

C= hina Telecom

&= nbsp;

From: lsr-bounces@ietf.org <lsr-bounces@ietf.org> On = Behalf Of Acee Lindem (acee)
Sent: Friday, November 20, = 2020 6:17 AM
To: lsr@ietf.org
Subject: [Lsr] = IETF I09 LSR Meeting Minutes

 

I have uploaded the minutes for = the meeting on Monday morning. Thanks much to Yingzhen Qu for taking = them. Please send me any additions or corrections to me.

 

https://datatr= acker.ietf.org/doc/minutes-109-lsr/

 

Presenters and draft authors, = please note that if more discussion is need on your draft then it is up = to you to initiate such discussion.

 

Thanks,

Acee

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(acee)" , "lsr@ietf.org" Thread-Topic: [Lsr] IETF I09 LSR Meeting Minutes Thread-Index: AQHWvsGy2GiX15EufUyQ30InyjnjQKnVf34A Date: Mon, 23 Nov 2020 09:58:50 +0000 Message-ID: <73bbb5deb3024b84a4ebbfb601651070@huawei.com> References: <6BDC5384-8B4A-4DD8-9641-BF8BE8668806@cisco.com> In-Reply-To: <6BDC5384-8B4A-4DD8-9641-BF8BE8668806@cisco.com> Accept-Language: en-US, zh-CN Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.108.243.143] Content-Type: multipart/alternative; boundary="_000_73bbb5deb3024b84a4ebbfb601651070huaweicom_" MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: Re: [Lsr] IETF I09 LSR Meeting Minutes X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 23 Nov 2020 09:59:02 -0000 --_000_73bbb5deb3024b84a4ebbfb601651070huaweicom_ Content-Type: text/plain; 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X-Spam-Status: No, score=-1.897 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, SPF_HELO_NONE=0.001, SPF_NONE=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id AKvd8eDiHBq6; Wed, 25 Nov 2020 08:03:31 -0800 (PST) Received: from smtp.chopps.org (smtp.chopps.org [54.88.81.56]) by ietfa.amsl.com (Postfix) with ESMTP id 5679A3A1940; Wed, 25 Nov 2020 08:03:31 -0800 (PST) Received: from [192.168.2.5] (047-050-069-038.biz.spectrum.com [47.50.69.38]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by smtp.chopps.org (Postfix) with ESMTPSA id 9923961698; Wed, 25 Nov 2020 16:03:30 +0000 (UTC) From: Christian Hopps Message-Id: <53341418-F403-46AE-8B64-63923EC37CC7@chopps.org> Content-Type: multipart/signed; boundary="Apple-Mail=_890D82E4-07D3-47E3-ACFE-527A767B66D2"; protocol="application/pgp-signature"; micalg=pgp-sha512 Mime-Version: 1.0 (Mac OS X Mail 13.4 \(3608.120.23.2.4\)) Date: Wed, 25 Nov 2020 11:03:29 -0500 In-Reply-To: Cc: Christian Hopps , draft-ietf-lsr-ospf-prefix-originator@ietf.org, lsr-chairs@ietf.org, lsr-ads@ietf.org To: lsr@ietf.org References: X-Mailer: Apple Mail (2.3608.120.23.2.4) Archived-At: Subject: Re: [Lsr] WG Last Call draft-ietf-lsr-ospf-prefix-originator-06 X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 25 Nov 2020 16:03:33 -0000 --Apple-Mail=_890D82E4-07D3-47E3-ACFE-527A767B66D2 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii The WGLC has completed. The documented was updated to address the = objections made during the WGLC. The write-up will begin and publication = will be requested. Thanks, Chris. > On Oct 15, 2020, at 2:15 AM, Christian Hopps = wrote: >=20 > Signed PGP part > This begins a 2 week WG Last Call, ending after Oct 29th, 2020, for: >=20 > = https://datatracker.ietf.org/doc/draft-ietf-lsr-ospf-prefix-originator/ >=20 > The following IPR has been filed = https://datatracker.ietf.org/ipr/3448/ >=20 > Authors, >=20 > Please indicate to the list, your knowledge of any other IPR related = to this work. >=20 > Thanks, > Chris. >=20 >=20 --Apple-Mail=_890D82E4-07D3-47E3-ACFE-527A767B66D2 Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename=signature.asc Content-Type: application/pgp-signature; name=signature.asc Content-Description: Message signed with OpenPGP -----BEGIN PGP SIGNATURE----- iQIzBAEBCgAdFiEEm56yH/NF+m1FHa6lLh2DDte4MCUFAl++gFEACgkQLh2DDte4 MCULQw/8CddlnsCFUg4JzuEiS2lUTiZhafAHYvMhyNEA6RcyZVr1/XiG2yZ9eJFr ueyjM64yPf95X3eHzWB/vinHXvHnxE9+VhAFBYBBppBqEyI8rQs7nJlEcqSR0SDa cM2MCcN2Ut2KVoIH66fm778tHOW+2fnGwQgt5+JQIfzTc/rOmAqXl+sBMcCpL4r3 P6kM3CZWUzcNjURAz/VZU9AI59f2jMrmzF1VnBHdxzbUVG7LW9NhYtqDl+wV6p8m dd8DIuaFni3OMonu7tq1/+t1Ps84usv6XI6+KzmOS4kw0PvEkLs/Lp7bm+astFXh HuTV3iX9DIDg8NTt6xG1UHtHClY3SkV88AZgFKNvz5iVEH9vugPBry/9u6gcCsIX z4/IlGZ6zbkUZCI09RraxGQlFf+vRuW2ghLrp3AuYQhs44geIOJNArzEw2OrPmIE Ubx+j7/TbEMHnLQfs0gRdXCsPxa2+jdVCUasPHcHMZ1wMtRDBv8bs66Cn8rVNap1 8wk38ikgwm32DPssXWDDIu0vb2P+J61IVCV8BKbdEa6oeX7JPann/7QMwCoF8Ogw eQO2ah9rc6rg3EZ0KVpuIIO3W6gyyO7wAqo8H6PoiwBDnk5LECB0GE0v4sBX8TX1 LMzjg1DvvgjU63Iy2JYlwdFDkFKIro5ePjzGksclg1oNpOGeGSU= =F3bb -----END PGP SIGNATURE----- --Apple-Mail=_890D82E4-07D3-47E3-ACFE-527A767B66D2-- From nobody Thu Nov 26 08:58:21 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 717DB3A14CA for ; 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Thu, 26 Nov 2020 08:58:16 -0800 (PST) Received: from [10.0.1.3] ([194.39.99.206]) by smtp.gmail.com with ESMTPSA id m19sm378407lfl.38.2020.11.26.08.58.15 for (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Thu, 26 Nov 2020 08:58:15 -0800 (PST) From: Alexander Okonnikov Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable Mime-Version: 1.0 (Mac OS X Mail 13.4 \(3608.120.23.2.4\)) Message-Id: <61201EB5-3F36-401A-9D39-FB0C577C7966@gmail.com> Date: Thu, 26 Nov 2020 19:58:15 +0300 To: lsr@ietf.org X-Mailer: Apple Mail (2.3608.120.23.2.4) Archived-At: Subject: [Lsr] Link Data value for Multi-area links X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 26 Nov 2020 16:58:20 -0000 Hi WG, RFC 5185 says that Neighbor's IP address to be encoded into Link Data = field. Per RFC 2328 router's own IP address to be encoded into Link = Data. What is the reason to advertise neighbor's IP address for = multi-area links and not local IP address? It seems like bug. Could = someone comment on this? Thanks in advance.= From nobody Thu Nov 26 10:00:52 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B165C3A15C9 for ; Thu, 26 Nov 2020 10:00:50 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.098 X-Spam-Level: X-Spam-Status: No, score=-2.098 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=raszuk.net Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id M8ks4x7I4uRi for ; Thu, 26 Nov 2020 10:00:49 -0800 (PST) Received: from mail-lj1-x236.google.com (mail-lj1-x236.google.com [IPv6:2a00:1450:4864:20::236]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 049443A15C8 for ; Thu, 26 Nov 2020 10:00:48 -0800 (PST) Received: by mail-lj1-x236.google.com with SMTP id f18so3222962ljg.9 for ; Thu, 26 Nov 2020 10:00:48 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=raszuk.net; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=SJUECNNXdBsdM/w6BiXDZ4WbplysAD/7RgepToD1E5Q=; b=CeIim/9xCjcdsLnD1zY7Q9mWTYu0tuHMBFofaMY/4Ozz2iKl6KsDSq7JteSV3sl5LE TpXEwPaY/yBANi6yqOhUVUox+mtjWSjw8GZvXx6dCMfbTehjvTxWvZJblq/UbxfJrWae O1NYRz2fzjF4HyM220lZoBK+76Gsv7OsfosKY5rm0WebLK5udK8dS6B/z+pqiE2xU5kA WlxZ6FIy22EYBmPciaQyA3Vt2qh2eQWU0LKM624Gp/g/AyP0RblO3IELIJPIcmFaxcf/ 8MeWrZheQs9mXYFt9L9M9s3Ndu1ZZ050BPQkFl8DyAnyqsfuwBHKNCUQIpaiSax0hOdf HnoQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=SJUECNNXdBsdM/w6BiXDZ4WbplysAD/7RgepToD1E5Q=; b=BwW6N+IlO+ncgQ45bEEl17p9fXBySGj1HvldBO+HSUQMKQpHYKQpLtQhdvho5xAKKV iUKW189WgJsuevAnblx8TwHf3Lzn6cEHQouFkqbaUyZps/EU9EKK4QYzW+Pr59a2zUU9 D4LHDuu7N+b1Vwln26Yo4iA+Cx9DEgRstM331wJ5X49Cyj4+eSHsqel7XBkXX7avjiko 99TR76wXRAUXK3kPn2MZoyOROCePhW5qXnTLl4VNNEq1uQ0Z9A+5BYr2PPcfLmZ/2VKD GQa6BAcn3ACG4BXHa/XGDNmm8bVz5bfANVFByZ1Err3zXjE5XxvizNkKCcpuKV7ZP9MA 1Xgw== X-Gm-Message-State: AOAM532gNA9BMwYMySEFXYgCAUW4VyMX5I5DepchQYRFYGlgxhrIYdUT gALUB9cCLHtwFZ9Ddo2xBkwSBWk4QKdgL8FVKhes7A== X-Google-Smtp-Source: ABdhPJwypr6rc2RE8k5uA2Wa3H2fHUiJIoPiNUtm/adq8zcNgI5Eh2VaNc8N02fH/iwVS/2/Cc/Rz3Nf/zegslQGePk= X-Received: by 2002:a2e:97cc:: with SMTP id m12mr1695553ljj.404.1606413647140; Thu, 26 Nov 2020 10:00:47 -0800 (PST) MIME-Version: 1.0 References: <61201EB5-3F36-401A-9D39-FB0C577C7966@gmail.com> In-Reply-To: <61201EB5-3F36-401A-9D39-FB0C577C7966@gmail.com> From: Robert Raszuk Date: Thu, 26 Nov 2020 19:00:36 +0100 Message-ID: To: Alexander Okonnikov Cc: lsr Content-Type: multipart/alternative; boundary="000000000000ccf1a105b50652a4" Archived-At: Subject: Re: [Lsr] Link Data value for Multi-area links X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 26 Nov 2020 18:00:51 -0000 --000000000000ccf1a105b50652a4 Content-Type: text/plain; charset="UTF-8" Alex, I believe the text in section 2.7 talks about Router LSA advertisements which contains both local information as well as information describing each formed adjacency with each neighbour. The RFC just talks about the new added part. Thx, R. On Thu, Nov 26, 2020 at 5:58 PM Alexander Okonnikov < alexander.okonnikov@gmail.com> wrote: > Hi WG, > > RFC 5185 says that Neighbor's IP address to be encoded into Link Data > field. Per RFC 2328 router's own IP address to be encoded into Link Data. > What is the reason to advertise neighbor's IP address for multi-area links > and not local IP address? It seems like bug. Could someone comment on this? > > Thanks in advance. > _______________________________________________ > Lsr mailing list > Lsr@ietf.org > https://www.ietf.org/mailman/listinfo/lsr > --000000000000ccf1a105b50652a4 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Alex,

I believe the text in section 2.7= talks about Router LSA advertisements which contains both local informatio= n as well as information describing each formed adjacency with each neighbo= ur. The RFC just talks about the new added part.=C2=A0=C2=A0

=
Thx,
R.

On Thu, Nov 26, 2020 at 5:58 PM Alexander= Okonnikov <alexander.o= konnikov@gmail.com> wrote:
Hi WG,

RFC 5185 says that Neighbor's IP address to be encoded into Link Data f= ield. Per RFC 2328 router's own IP address to be encoded into Link Data= . What is the reason to advertise neighbor's IP address for multi-area = links and not local IP address? It seems like bug. Could someone comment on= this?

Thanks in advance.
_______________________________________________
Lsr mailing list
Lsr@ietf.org
https://www.ietf.org/mailman/listinfo/lsr
--000000000000ccf1a105b50652a4-- From nobody Fri Nov 27 03:50:38 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3704C3A09B5 for ; Fri, 27 Nov 2020 03:50:37 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -9.602 X-Spam-Level: X-Spam-Status: No, score=-9.602 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, NICE_REPLY_A=-0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id wQEuRqQOwP5W for ; Fri, 27 Nov 2020 03:50:35 -0800 (PST) Received: from aer-iport-1.cisco.com (aer-iport-1.cisco.com [173.38.203.51]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 6F1C53A09AD for ; Fri, 27 Nov 2020 03:50:35 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=754; q=dns/txt; s=iport; t=1606477835; x=1607687435; h=subject:to:references:from:message-id:date:mime-version: in-reply-to:content-transfer-encoding; bh=DboiJzOLLl+ELtCihpWPBsWEObInYtETtgX+c/KX2+g=; b=PUjc+lepUuxdGa6tfb/qBKGd9TB/zRdglI+A7mTRIQI//40x+GKEgl0D c3HF3XxC0MiKtxCgDdn4KAKaovarKHkrRfw8/UZVK8lgLi5OtCumkf20D MyhzMQV/lFm/czxuL7mreMXvGCPrSDnvVAaULGnVLEORD6PyjYM/iIjKx I=; X-IPAS-Result: =?us-ascii?q?A0BACgBS58Bf/xbLJq1iHgEBCxIMQIRuVgEgEi6EPYkFh?= =?us-ascii?q?3UvnDALAQEBDxgLDAQBAYRKAoIqJjgTAgMBAQEDAgMBAQEBBQEBAQIBBgRxh?= =?us-ascii?q?WEMhXIBAQEDAQEBIRU2GwsYAgImAgInMAYBDAYCAQGDIgGCZiAPrzN2gTKFV?= =?us-ascii?q?4NTgTwGgQ4qiS2ELoFBP4E4gkMuPoJdAQGEdoJfBJxgnAqCeYMdmAMFBwMfk?= =?us-ascii?q?mCPNB2TSKEWgW0jgVczGggbFTuCaVAZDZcmhUVAAzA3AgYKAQEDCY9aAQE?= X-IronPort-Anti-Spam-Filtered: true X-IronPort-AV: E=Sophos;i="5.78,374,1599523200"; d="scan'208";a="31454630" Received: from aer-iport-nat.cisco.com (HELO aer-core-3.cisco.com) ([173.38.203.22]) by aer-iport-1.cisco.com with ESMTP/TLS/DHE-RSA-SEED-SHA; 27 Nov 2020 11:50:33 +0000 Received: from [10.60.140.52] (ams-ppsenak-nitro3.cisco.com [10.60.140.52]) by aer-core-3.cisco.com (8.15.2/8.15.2) with ESMTP id 0ARBoXZ5016992; Fri, 27 Nov 2020 11:50:33 GMT To: Alexander Okonnikov , lsr@ietf.org References: <61201EB5-3F36-401A-9D39-FB0C577C7966@gmail.com> From: Peter Psenak Message-ID: <3d3d863b-3e1f-ea87-0c45-09e119aa7c8f@cisco.com> Date: Fri, 27 Nov 2020 12:50:33 +0100 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: <61201EB5-3F36-401A-9D39-FB0C577C7966@gmail.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Outbound-SMTP-Client: 10.60.140.52, ams-ppsenak-nitro3.cisco.com X-Outbound-Node: aer-core-3.cisco.com Archived-At: Subject: Re: [Lsr] Link Data value for Multi-area links X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 27 Nov 2020 11:50:37 -0000 Alexander, On 26/11/2020 17:58, Alexander Okonnikov wrote: > Hi WG, > > RFC 5185 says that Neighbor's IP address to be encoded into Link Data field. Per RFC 2328 router's own IP address to be encoded into Link Data. What is the reason to advertise neighbor's IP address for multi-area links and not local IP address? It seems like bug. Could someone comment on this? Advertising a neighbor address/ifindex helps to eliminate ambiguity in case of parallel point-to-point adjacencies. It's not perfect, but that's how it was specified. So it's not a bug. thanks, Peter > > Thanks in advance. > _______________________________________________ > Lsr mailing list > Lsr@ietf.org > https://www.ietf.org/mailman/listinfo/lsr > > From nobody Fri Nov 27 04:49:24 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B27D03A0AE6 for ; Fri, 27 Nov 2020 04:49:23 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.098 X-Spam-Level: X-Spam-Status: No, score=-2.098 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id qCe6mtmZAKeq for ; Fri, 27 Nov 2020 04:49:22 -0800 (PST) Received: from mail-lf1-x12d.google.com (mail-lf1-x12d.google.com [IPv6:2a00:1450:4864:20::12d]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id D41103A0AE5 for ; Fri, 27 Nov 2020 04:49:21 -0800 (PST) Received: by mail-lf1-x12d.google.com with SMTP id l11so6918381lfg.0 for ; Fri, 27 Nov 2020 04:49:21 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=+OG5iEkLSNUcmULQpolOSMsNymuyccpx3SMNlKMV2vw=; b=cTelOQwIMK9adTkgGJYKHFochHxsOc5cqhTPz4xRYu2KocMoK6LvA0cBOnuOdt/fjs UzABj9T5porwVWhgTHheRv5uRlaBF5XGl2tX4nFMZljAN4l4wAj3QXPpK56vrLjpftlF u7ypG+fV84m+e+Pn9nuzK9bZk/zKIIrvkC88LgZSFJhgfZJ8gN4erW62CGkX8TYCYJ0l GeLdqLEjvRso7m+jpcxUzvDp51MGX74KB+4b2yluyxC+yy+LSPWcbll/htQi0BHeYmxm PX2jc2wjYvkgIFjar9PLN0A9d/pvBg2BXbkH5IABTdSFlXGSRTsvJqu+GZGBAsu6P/fx /daw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=+OG5iEkLSNUcmULQpolOSMsNymuyccpx3SMNlKMV2vw=; b=HLviVnsvjZSsgoFzMcL/BTXEBvij5uwh2ZQxJLzDb+jE4HE2P52zAr/exo0EG4B5gS wG6RZ9QIKCaqDtL9LZ7Ir6/98Zncid2uEq7ZiL8eF+WGd0hdGOKEpBzZ/ZDhupf5oYUZ S1m5tvHg5IYEejiwTLbLnIhCQ0hSSGwCIlT7Y1gytYNlU3OnJQzf0mUf+D7MqjhORVWu MIjVenOCKiUh4XLNVsRF0qzOGo2Hs0IbsLbeNqlWKi+i7HffmBY65U4MpVIWFTp1zAyE jYM6CzENtbhbvZHSvTdnb5/0Cbq83vJqGsyMBKxrptTh/SuxQjEZTWzohJIvnvD84EJm ds3w== X-Gm-Message-State: AOAM533xbwPfxKX4oTybW3/d2ExgqyTRmL4ZjycqQQloe9k9AazxFAy3 LdW8sB1tHAdgFRvdhO1tgRw= X-Google-Smtp-Source: ABdhPJzloRKkGl44GQ9fi5b+eLVquGpLN8jskQneRdVgoGrTEeqsmOUeL85spTer/jLnBdCod+C/hg== X-Received: by 2002:a19:6d15:: with SMTP id i21mr3143046lfc.166.1606481359853; Fri, 27 Nov 2020 04:49:19 -0800 (PST) Received: from [10.0.1.3] ([194.39.99.206]) by smtp.gmail.com with ESMTPSA id m202sm675317lfa.208.2020.11.27.04.49.19 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Fri, 27 Nov 2020 04:49:19 -0800 (PST) Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 13.4 \(3608.120.23.2.4\)) From: Alexander Okonnikov In-Reply-To: <3d3d863b-3e1f-ea87-0c45-09e119aa7c8f@cisco.com> Date: Fri, 27 Nov 2020 15:49:18 +0300 Cc: lsr@ietf.org Content-Transfer-Encoding: quoted-printable Message-Id: <3FE4F6F8-6819-425E-852F-6B5B968ECAF5@gmail.com> References: <61201EB5-3F36-401A-9D39-FB0C577C7966@gmail.com> <3d3d863b-3e1f-ea87-0c45-09e119aa7c8f@cisco.com> To: Peter Psenak X-Mailer: Apple Mail (2.3608.120.23.2.4) Archived-At: Subject: Re: [Lsr] Link Data value for Multi-area links X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 27 Nov 2020 12:49:24 -0000 Hi Peter, Which kind of ambiguity is meant? In case of numbered point-to-point = each link has its own unique IP address, so there is no ambiguity. Per my understanding this problem has appeared due to follow reasons: 1) In old versions of the draft (up to -05) it was proposed that = multi-area links are treated as unnumbered. ifIndex to be encoded in = Link Data field, irrespectively whether interface has its own IP address = (numbered) or borrow it (unnumbered); 2) =46rom -06 to -08 multi-area links are still treated as unnumbered, = but if interface is numbered, then IP address of the neighbor (rather = than local one) to be encoded into Link Data, in order to make the link = look like unnumbered; 3) In version -09 of the draft and in RFC 5185 itself there is no more = mentions that multi-area link to be treated as unnumbered. Rather, = another approach is used - if router's interface is numbered, then link = is also numbered; if router's interface is unnumbered, then link is = unnumbered. The rule that specifies omitting corresponding type 3 link = is added. Mention of 'unnumbered' link is also removed from section 3 in = RFC 5185. Hence, in version -09 with removing unnumbered nature of multi-area = links Link Data for numbered links had to be changed from Neighbor's IP = address to own IP address, as it is specified in RFC 2328. =46rom = perspective of other routers this link can be treated as numbered or = unnumbered, depending on configuration of neighbor's corresponding = interface. One question - how neighboring router will perform next-hop calculation = (in case it needs to do so)? If neighbor is configured with numbered = interface, it will treat Link Data as IP next hop, which will be its own = IP interface address. Another question - how router will be able to match Link TLV (RFC 3630) = to corresponding Link in Router LSA? For example, we want to calculate = RSVP-TE LSP based on IGP metric (RFC 3785) and thus router needs to = match IGP link to TE link. Thank you. > 27 =D0=BD=D0=BE=D1=8F=D0=B1. 2020 =D0=B3., =D0=B2 14:50, Peter Psenak = =D0=BD=D0=B0=D0=BF=D0=B8=D1=81=D0=B0=D0=BB(=D0=B0): >=20 > Alexander, >=20 > On 26/11/2020 17:58, Alexander Okonnikov wrote: >> Hi WG, >> RFC 5185 says that Neighbor's IP address to be encoded into Link Data = field. Per RFC 2328 router's own IP address to be encoded into Link = Data. What is the reason to advertise neighbor's IP address for = multi-area links and not local IP address? It seems like bug. Could = someone comment on this? >=20 > Advertising a neighbor address/ifindex helps to eliminate ambiguity in = case of parallel point-to-point adjacencies. It's not perfect, but = that's how it was specified. So it's not a bug. >=20 > thanks, > Peter >=20 >> Thanks in advance. >> _______________________________________________ >> Lsr mailing list >> Lsr@ietf.org >> https://www.ietf.org/mailman/listinfo/lsr >=20 From nobody Sun Nov 29 20:36:17 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 487283A0EA6 for ; Sun, 29 Nov 2020 20:36:16 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.12 X-Spam-Level: X-Spam-Status: No, score=-2.12 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_MSPIKE_H4=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=juniper.net header.b=AFsnNIwP; 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=?us-ascii?Q?BHFiLyVAHJFCZVH+t7r3e/KNphsXS3FQ3ur/SSvkqviG/GjnxXk3s2b+B1CB?= =?us-ascii?Q?R7PLogLEDdoEajs1nTBFWUIiiKxrM7pYiFHNuvvhBcX95IwHms3nKWe2/h7B?= =?us-ascii?Q?yZQGL9VnGa25anXhrERivqfMM8eiYgvsflbr5XCsIKOYfl/9idEHtAU+DVZ1?= =?us-ascii?Q?GkJYAD0SqJTg6ok8BgmNTFTfw74fRZvTK6IPDNmuyVyJNOYc8w96MCiR6YgW?= =?us-ascii?Q?aEX+bDoVVELo23b/QcGpqcuuZcSja6p+JqUM8Qn76MSOI0ToE2AlyKtFjDVp?= =?us-ascii?Q?I0cZsEdCiSbSL2zEFgP+qNzSvVVeX1uehbvJB4o1UdadEDOFdbPwVKq1+/Zz?= =?us-ascii?Q?6wPLpPBAFefEuRA9oDTHD7Jl347xwLFKI2MTVBGF5BfO9j/Dp6yAXXAcpxFJ?= =?us-ascii?Q?UMemHVZ+uqpK/lX2cROu+bOKXWiQtuO0Xi4jZwfpVHcM03IF8BD49BbCGUsF?= =?us-ascii?Q?C+An1Km+Rkhjr6BCDj8lQ0Zew+ZNgdKL6lqdWrZfDxUctQUY2r5Kz5AExQqK?= =?us-ascii?Q?TKd8wA2mOiF3QjmJz8shJkJE5H5T6c0rH5nvhiGr5JfcJxBAj+J0fVCI/4Sb?= =?us-ascii?Q?HlpMDZCoT4Nk0ujy+sdA5kmYs6I7mo5m7Fzyy51JKLoWaACwnesYseNcEvyv?= =?us-ascii?Q?NXFIpZO218fuMb/gMMctlNao+wnBelNfIJfeLZ+g6DQr3+SDAZbh41fTUhnf?= =?us-ascii?Q?IOJQVPQkCiKohqRTP2rqqWb8q73HnO1patjxxZslkxXO6ve9+kRLNELeiO40?= 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E+THUI5K1KWqynhX/Lw+QGd7QnQpNKQ49VOFykSBna/3S1BQOKtrWUJ9AedrTBavwXI9ReOsYtY3ybv6wnh8Mg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: BYAPR11MB2869 X-OriginatorOrg: cisco.com X-Outbound-SMTP-Client: 173.37.102.14, xch-rcd-004.cisco.com X-Outbound-Node: rcdn-core-5.cisco.com Archived-At: Subject: Re: [Lsr] New Version Notification for draft-white-lsr-distoptflood-00.txt X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 30 Nov 2020 06:13:47 -0000 --_000_BY5PR11MB43378F8D1E12A7EFA591C014C1F50BY5PR11MB4337namp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Draft authors - I note that as the draft has evolved over the years a number of mechanisms = have been removed (revised adjacency formation and auto tier detection) and= the draft now focuses exclusively on flooding optimizations. The draft now also references the recent work done in draft-ietf-lsr-dynami= c-flooding. A couple of things are not clear to me. 1)Is it your intent to use the mechanisms defined in draft-ietf-lsr-dynamic= -flooding? I am specifically - though not exclusively - referring to how fl= ooding adapts to topology changes. It isn't clear from Section 3 whether you are actually intending to use the= mechanisms defined in https://tools.ietf.org/html/draft-ietf-lsr-dynamic-f= looding-07#section-6.8 or whether you simply want to use the Flooding sub-T= LV defined in draft-ietf-lsr-dynamic-flooding to (optionally??) advertise y= our algorithm and all other procedures are specific to your algorithm. 2)The text at the end of https://tools.ietf.org/html/draft-white-lsr-distop= tflood-00#section-2.1 states: " LSPs transmitted to adjacent neighbors on the DNR list, however, MUST be transmitted using a circuit scope PDU as described in [RFC7356]." Although this text is not new to this revision, it raises a number of quest= ions/concerns - some of which relate to how this draft fits with draft-ietf= -lsr-dynamic-flooding. For "DNR neighbors", although a circuit scoped LSP was received, the actual= content is a traditional area scoped LSP. This presumably needs to be used= internally (e.g., when running the Decision Process) in the same way as an= area scoped LSP. So there are now two internal databases (traditional area= LSPs and Circuit Scoped LSPs) which have to be used as if they are a singl= e database? When a node sends a traditional CSNP does it include the LSPs it received a= s Circuit-Scoped LSPs? If not, how is resynchronization achieved when necessary? Given the base work defined in draft-ietf-lsr-dynamic-flooding why is the u= se of Circuit Scoped LSPs required/useful? In general, it would be helpful to more completely define the relationship = between this draft and draft-ietf-lsr-dynamic-flooding. Thanx. Les > -----Original Message----- > From: Lsr On Behalf Of Shraddha Hegde > Sent: Sunday, November 29, 2020 8:36 PM > To: lsr@ietf.org > Subject: [Lsr] FW: New Version Notification for draft-white-lsr-distoptfl= ood- > 00.txt > > WG members, > > > We have posted new version of the draft-white-lsr-distoptflood. > This draft has been around for sometime by name openfabric and > draft-white-distoptflood. The current revision has the name changed > to reflect LSR WG. > This draft describes a flood reduction mechanism in ISIS which is based o= n > similar mechanisms implemented in OSPF for mobile-ad-hoc Networks > ([RFC5449], [RFC5614], and [RFC7182]). > > Request working group to review and provide inputs. > > Rgds > Shraddha > > > Juniper Business Use Only > > -----Original Message----- > From: internet-drafts@ietf.org > > Sent: Monday, November 30, 2020 9:59 AM > To: Shraddha Hegde >; R= uss White >; > Shawn Zandi > > Subject: New Version Notification for draft-white-lsr-distoptflood-00.txt > > [External Email. Be cautious of content] > > > A new version of I-D, draft-white-lsr-distoptflood-00.txt > has been successfully submitted by Shraddha Hegde and posted to the IETF > repository. > > Name: draft-white-lsr-distoptflood > Revision: 00 > Title: IS-IS Optimal Distributed Flooding for Dense Topologies > Document date: 2020-11-29 > Group: Individual Submission > Pages: 12 > URL: > https://urldefense.com/v3/__https://www.ietf.org/archive/id/draft-white-<= https://urldefense.com/v3/__https:/www.ietf.org/archive/id/draft-white-lsr-= distoptflood-00.txt__;!!NEt6yMaO-gk!T5HX4Enn7jt3zwKoZBiA85YlysK0tdcELjk7Fy8= 29PRSockmshBtqxzkSEm2FfjO$> > lsr-distoptflood-00.txt__;!!NEt6yMaO- > gk!T5HX4Enn7jt3zwKoZBiA85YlysK0tdcELjk7Fy829PRSockmshBtqxzkSEm2FfjO > $ > Status: > https://urldefense.com/v3/__https://datatracker.ietf.org/doc/draft-white-= > lsr-distoptflood/__;!!NEt6yMaO- > gk!T5HX4Enn7jt3zwKoZBiA85YlysK0tdcELjk7Fy829PRSockmshBtqxzkSC0pwav > Y$ > Htmlized: > https://urldefense.com/v3/__https://datatracker.ietf.org/doc/html/draft-<= https://urldefense.com/v3/__https:/datatracker.ietf.org/doc/html/draft-whit= e-lsr-distoptflood__;!!NEt6yMaO-gk!T5HX4Enn7jt3zwKoZBiA85YlysK0tdcELjk7Fy82= 9PRSockmshBtqxzkSFYebZSl$> > white-lsr-distoptflood__;!!NEt6yMaO- > gk!T5HX4Enn7jt3zwKoZBiA85YlysK0tdcELjk7Fy829PRSockmshBtqxzkSFYebZSl > $ > Htmlized: https://urldefense.com/v3/__https://tools.ietf.org/html/d= raft- > white-lsr-distoptflood-00__;!!NEt6yMaO- > gk!T5HX4Enn7jt3zwKoZBiA85YlysK0tdcELjk7Fy829PRSockmshBtqxzkSANTt6Q > 2$ > > > Abstract: > In dense topologies, such as data center fabrics based on the Clos > and butterfly fabric topologies, flooding mechanisms designed for > sparse topologies, when used in these dense topologies, can > "overflood," or carry too many copies of topology and reachability to > fabric devices. This results in slower convergence times and higher > resource utilization. The modifications to the flooding mechanism in > the Intermediate System to Intermediate System (IS-IS) link state > protocol described in this document reduce resource utilization to a > minimum, while increaseing convergence performance in dense > topologies. > > Note that a Clos fabric is used as the primary example of a desne > flooding topology throughout this document. However, the flooding > optimizations described in this document apply to any dense topology. > > > > > Please note that it may take a couple of minutes from the time of submiss= ion > until the htmlized version and diff are available at tools.ietf.org. > > The IETF Secretariat > > _______________________________________________ > Lsr mailing list > Lsr@ietf.org > https://www.ietf.org/mailman/listinfo/lsr --_000_BY5PR11MB43378F8D1E12A7EFA591C014C1F50BY5PR11MB4337namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Draft authors -

 

I note that as the draft has evolved over the yea= rs a number of mechanisms have been removed (revised adjacency formation an= d auto tier detection) and the draft now focuses exclusively on flooding op= timizations.

The draft now also references the recent work don= e in draft-ietf-lsr-dynamic-flooding.

 

A couple of things are not clear to me.

 

1)Is it your intent to use the mechanisms defined= in draft-ietf-lsr-dynamic-flooding? I am specifically - though not exclusi= vely - referring to how flooding adapts to topology changes.

It isn't clear from Section 3 whether you are act= ually intending to use the mechanisms defined in https://tools.ietf.org/html/draft-ietf-lsr-dynamic-flooding-07#section-6.8<= /a> or whether you simply want to use the Flooding sub-TLV defined in draft= -ietf-lsr-dynamic-flooding to (optionally??) advertise your algorithm and a= ll other procedures are specific to your algorithm.

 

2)The text at the end of https://tools.ietf.org/html/draft-white-lsr-distoptflood-00#section-2.1= states:

 

" LSPs transmitted to adjacent

   neighbors on the DNR list, however, = MUST be transmitted using a

   circuit scope PDU as described in [R= FC7356]."

 

Although this text is not new to this revision, i= t raises a number of questions/concerns – some of which relate to how= this draft fits with draft-ietf-lsr-dynamic-flooding.

 

For “DNR neighbors”, although a circu= it scoped LSP was received, the actual content is a traditional area scoped= LSP. This presumably needs to be used internally (e.g., when running the D= ecision Process) in the same way as an area scoped LSP. So there are now two internal databases (traditional area LSPs and Ci= rcuit Scoped LSPs) which have to be used as if they are a single database?<= o:p>

When a node sends a traditional CSNP does it incl= ude the LSPs it received as Circuit-Scoped LSPs?

If not, how is resynchronization achieved when ne= cessary?

Given the base work defined in draft-ietf-lsr-dyn= amic-flooding why is the use of Circuit Scoped LSPs required/useful?

 

In general, it would be helpful to more completel= y define the relationship between this draft and draft-ietf-lsr-dynamic-flo= oding.

 

Thanx.

 

   Les

 

 

> -----Original Message-----

> From: Lsr <lsr-bounces@ietf.org> On Be= half Of Shraddha Hegde

> Sent: Sunday, November 29, 2020 8:36 PM

> To: lsr@ietf.org

> Subject: [Lsr] FW: New Version Notification = for draft-white-lsr-distoptflood-

> 00.txt

>

> WG members,

>

>

> We have posted new version of the draft-whit= e-lsr-distoptflood.

> This draft has been around for sometime by n= ame openfabric and

> draft-white-distoptflood. The current revisi= on has the name changed

> to reflect LSR WG.

> This draft describes a flood reduction mecha= nism in ISIS which is based on

> similar mechanisms implemented in OSPF for m= obile-ad-hoc Networks

> ([RFC5449], [RFC5614], and [RFC7182]).

>

> Request working group to review and provide = inputs.

>

> Rgds

> Shraddha

>

>

> Juniper Business Use Only

>

> -----Original Message-----

> From: internet-drafts= @ietf.org <internet-drafts@ietf.org>

> Sent: Monday, November 30, 2020 9:59 AM

> To: Shraddha Hegde <sh= raddha@juniper.net>; Russ White <russ@riw.us>;

> Shawn Zandi <szandi@lin= kedin.com>

> Subject: New Version Notification for draft-= white-lsr-distoptflood-00.txt

>

> [External Email. Be cautious of content]

>

>

> A new version of I-D, draft-white-lsr-distop= tflood-00.txt

> has been successfully submitted by Shraddha = Hegde and posted to the IETF

> repository.

>

> Name:      &nb= sp;    draft-white-lsr-distoptflood

> Revision:      = ; 00

> Title:      &n= bsp;   IS-IS Optimal Distributed Flooding for Dense Topologies

> Document date:  2020-11-29

> Group:      &n= bsp;   Individual Submission

> Pages:      &n= bsp;   12

> URL:

> https://urldefense.co= m/v3/__https://www.ietf.org/archive/id/draft-white-

> lsr-distoptflood-00.txt__;!!NEt6yMaO-

> gk!T5HX4Enn7jt3zwKoZBiA85YlysK0tdcELjk7Fy829PRSockmshBtqxzkSEm2FfjO=

> $

> Status:

> https://urldefense.co= m/v3/__https://datatracker.ietf.org/doc/draft-white-

> lsr-distoptflood/__;!!NEt6yMaO-

> gk!T5HX4Enn7jt3zwKoZBiA85YlysK0tdcELjk7Fy829PRSockmshBtqxzkSC0pwav<= /a>

> Y$

> Htmlized:

> https://urldefense.co= m/v3/__https://datatracker.ietf.org/doc/html/draft-

> white-lsr-distoptflood__;!!NEt6yMaO-

> gk!T5HX4Enn7jt3zwKoZBiA85YlysK0tdcELjk7Fy829PRSockmshBtqxzkSFYebZSl=

> $

> Htmlized:      = ; https://urldefense.co= m/v3/__https://tools.ietf.org/html/draft-

> white-lsr-distoptflood-00__;!!NEt6yMaO-

> gk!T5HX4Enn7jt3zwKoZBiA85YlysK0tdcELjk7Fy829PRSockmshBtqxzkSANTt6Q<= /a>

> 2$

>

>

> Abstract:

>    In dense topologies, such = as data center fabrics based on the Clos

>    and butterfly fabric topol= ogies, flooding mechanisms designed for

>    sparse topologies, when us= ed in these dense topologies, can

>    "overflood," or = carry too many copies of topology and reachability to

>    fabric devices.  This= results in slower convergence times and higher

>    resource utilization. = ; The modifications to the flooding mechanism in

>    the Intermediate System to= Intermediate System (IS-IS) link state

>    protocol described in this= document reduce resource utilization to a

>    minimum, while increaseing= convergence performance in dense

>    topologies.

>

>    Note that a Clos fabric is= used as the primary example of a desne

>    flooding topology througho= ut this document.  However, the flooding

>    optimizations described in= this document apply to any dense topology.

>

>

>

>

> Please note that it may take a couple of min= utes from the time of submission

> until the htmlized version and diff are avai= lable at tools.ietf.org.

>

> The IETF Secretariat

>

> ____________________________________________= ___

> Lsr mailing list

> Lsr@ietf.org

> https://www= .ietf.org/mailman/listinfo/lsr

--_000_BY5PR11MB43378F8D1E12A7EFA591C014C1F50BY5PR11MB4337namp_-- From nobody Mon Nov 30 01:56:32 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id AD84A3A1195 for ; Mon, 30 Nov 2020 01:56:30 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -9.602 X-Spam-Level: X-Spam-Status: No, score=-9.602 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, NICE_REPLY_A=-0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ZDbhdILiHEEn for ; Mon, 30 Nov 2020 01:56:29 -0800 (PST) Received: from aer-iport-2.cisco.com (aer-iport-2.cisco.com [173.38.203.52]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 933F93A1196 for ; Mon, 30 Nov 2020 01:56:28 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=3339; q=dns/txt; s=iport; t=1606730188; x=1607939788; h=subject:to:cc:references:from:message-id:date: mime-version:in-reply-to:content-transfer-encoding; bh=48qcHSuBhCJ1C37O/WYDptKr3jooRFwS6F1QhSCVXyg=; b=CkHehEJ0x1Gj7OqdaxJann6/jFxREqsCkmjdb2Oepc+RdXQLzcVwvxzH E/grUmFrv6BGf0DI5UaRlSc8rkYq62/Q7npOzw7W2NdQ+oVNvZNiDG2hd xPKJL9IXR+B7TeB8JGxwhf+1yLyAbAHsQKdx9sppsolo4VeE47QeV9Unf I=; X-IPAS-Result: =?us-ascii?q?A0CDCABQwcRf/xbLJq1iHgEBCxIMQIRuVgEgEi6EPYkFh?= =?us-ascii?q?3EIJ5pIgWgLAQEBDxgLDAQBAYRKAoIqJjgTAgMBAQEDAgMBAQEBBQEBAQIBB?= =?us-ascii?q?gRxhWEMhXIBAQEDAQEBIQ8BBTYLEAkCGAICJgICJzAGDQYCAQGDIgGCZiAPk?= =?us-ascii?q?DCbEnaBMoVXgymBPAaBDiqNW4FBP4EQAScMgjcuPoJdAQGBRYMxgl8EpwaQV?= =?us-ascii?q?YEPgnqDHYxjiyAFBwMfkmCDOot6HbRfgW0jgVczGggbFTuCaVAZDZcmhUVAA?= =?us-ascii?q?zA3AgYBCQEBAwmNMAeCPwEB?= X-IronPort-Anti-Spam-Filtered: true X-IronPort-AV: E=Sophos;i="5.78,381,1599523200"; d="scan'208";a="31509198" Received: from aer-iport-nat.cisco.com (HELO aer-core-3.cisco.com) ([173.38.203.22]) by aer-iport-2.cisco.com with ESMTP/TLS/DHE-RSA-SEED-SHA; 30 Nov 2020 09:56:24 +0000 Received: from [10.60.140.52] (ams-ppsenak-nitro3.cisco.com [10.60.140.52]) by aer-core-3.cisco.com (8.15.2/8.15.2) with ESMTP id 0AU9uOTY003733; Mon, 30 Nov 2020 09:56:24 GMT To: Alexander Okonnikov Cc: lsr@ietf.org References: <61201EB5-3F36-401A-9D39-FB0C577C7966@gmail.com> <3d3d863b-3e1f-ea87-0c45-09e119aa7c8f@cisco.com> <3FE4F6F8-6819-425E-852F-6B5B968ECAF5@gmail.com> From: Peter Psenak Message-ID: <57b88873-b0e9-c2d3-2732-7f2629eebf27@cisco.com> Date: Mon, 30 Nov 2020 10:56:23 +0100 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: <3FE4F6F8-6819-425E-852F-6B5B968ECAF5@gmail.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit X-Outbound-SMTP-Client: 10.60.140.52, ams-ppsenak-nitro3.cisco.com X-Outbound-Node: aer-core-3.cisco.com Archived-At: Subject: Re: [Lsr] Link Data value for Multi-area links X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 30 Nov 2020 09:56:31 -0000 Hi Alex, On 27/11/2020 13:49, Alexander Okonnikov wrote: > Hi Peter, > > Which kind of ambiguity is meant? In case of numbered point-to-point each link has its own unique IP address, so there is no ambiguity. > > Per my understanding this problem has appeared due to follow reasons: > > 1) In old versions of the draft (up to -05) it was proposed that multi-area links are treated as unnumbered. ifIndex to be encoded in Link Data field, irrespectively whether interface has its own IP address (numbered) or borrow it (unnumbered); > > 2) From -06 to -08 multi-area links are still treated as unnumbered, but if interface is numbered, then IP address of the neighbor (rather than local one) to be encoded into Link Data, in order to make the link look like unnumbered; > > 3) In version -09 of the draft and in RFC 5185 itself there is no more mentions that multi-area link to be treated as unnumbered. Rather, another approach is used - if router's interface is numbered, then link is also numbered; if router's interface is unnumbered, then link is unnumbered. The rule that specifies omitting corresponding type 3 link is added. Mention of 'unnumbered' link is also removed from section 3 in RFC 5185. > > Hence, in version -09 with removing unnumbered nature of multi-area links Link Data for numbered links had to be changed from Neighbor's IP address to own IP address, as it is specified in RFC 2328. From perspective of other routers this link can be treated as numbered or unnumbered, depending on configuration of neighbor's corresponding interface. you are free to advertise the link as unnumbered. RFC5185 is not mandating to send IP address really. > > One question - how neighboring router will perform next-hop calculation (in case it needs to do so)? If neighbor is configured with numbered interface, it will treat Link Data as IP next hop, which will be its own IP interface address. > > Another question - how router will be able to match Link TLV (RFC 3630) to corresponding Link in Router LSA? For example, we want to calculate RSVP-TE LSP based on IGP metric (RFC 3785) and thus router needs to match IGP link to TE link. I don't believe you are going to do any traffic engineering over a multi-area adjacency. MADJ is there to address the OSPF route preference rules that may lead to sub-optimal routing. MADJ link is not advertised for TE purposes. thanks, Peter > > Thank you. > >> 27 нояб. 2020 г., в 14:50, Peter Psenak написал(а): >> >> Alexander, >> >> On 26/11/2020 17:58, Alexander Okonnikov wrote: >>> Hi WG, >>> RFC 5185 says that Neighbor's IP address to be encoded into Link Data field. Per RFC 2328 router's own IP address to be encoded into Link Data. What is the reason to advertise neighbor's IP address for multi-area links and not local IP address? It seems like bug. Could someone comment on this? >> >> Advertising a neighbor address/ifindex helps to eliminate ambiguity in case of parallel point-to-point adjacencies. It's not perfect, but that's how it was specified. So it's not a bug. >> >> thanks, >> Peter >> >>> Thanks in advance. >>> _______________________________________________ >>> Lsr mailing list >>> Lsr@ietf.org >>> https://www.ietf.org/mailman/listinfo/lsr >> > > > From nobody Mon Nov 30 02:26:57 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 30D843A02BC for ; Mon, 30 Nov 2020 02:26:55 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.097 X-Spam-Level: X-Spam-Status: No, score=-2.097 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 4bI5K57CvPZq for ; Mon, 30 Nov 2020 02:26:53 -0800 (PST) Received: from mail-lj1-x231.google.com (mail-lj1-x231.google.com [IPv6:2a00:1450:4864:20::231]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 0418F3A03EC for ; Mon, 30 Nov 2020 02:26:52 -0800 (PST) Received: by mail-lj1-x231.google.com with SMTP id o24so17002861ljj.6 for ; Mon, 30 Nov 2020 02:26:52 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:message-id:mime-version:subject:date:in-reply-to:cc:to :references; bh=1NqRBc47Ngc7RTHEl7ie1+UbGoQYgE4iHLZ89FOTaZc=; b=hSxVudKih5U6zDcx3wXhZymf3y179hbv+AH5xn91jUVsKnPxUvZmhHuvn7T9ANbzj+ gAZJi7gVk9x++LusRVSF12pWboOkNkwg3RdQeAnHluuEljYw/J8q+aWvCdBDtpUQwNJL yZGjvLcH/G2t6BmaakVn3LngDFsmzqQMHSSCFAshqQWEIQhBv/0m5bOa2DBlkCy0xZTJ P1v3VKKx+z2q0C1/RdOZ7/MWW4K7suTsNx+bxppGX0GsuMoC2nZWWrhxhGY1UuRpdYPb axHM1RdpGvOC4YYzsdosXteWUjn/ZzLSkkK8xdjYUZwYhKiEl3X83cIAgMtLuI81VsQ2 GXnA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:message-id:mime-version:subject:date :in-reply-to:cc:to:references; bh=1NqRBc47Ngc7RTHEl7ie1+UbGoQYgE4iHLZ89FOTaZc=; b=rXEldVAKlHkhXnY/WoC/q5rH+m/9BUh18DNsIPnnOg84tldEp7o4qic0teYbr8i+6q hlXYo3HVkTssMKF5rBQtHQD6Di/f/elDxioCluJn+fWQoankZWtgU0ZV+br71xbB9rtW Fis9X/uMtf+NO3JtG6oFGbpftY8n0OW8qPlN6twKWgeJ6h4GaeUlRH331jL8bUp2mkXS KlJq3Y2YRnxbzHQ61+AR+936avJjTGSKUEkNWx74JHH6q01sii+AYwJNLnhrLZW/9AMi QevB/RxhstkzND6hP7/VvHJfuRtzwcRGlghEXJ3yh1EzYl3WmAZumv2cwAviQaO6muIz W9jg== X-Gm-Message-State: AOAM531A6MpE3mO6pz+m4vMpB85Q4XCxZeB019fNDjLjPg0d5bwJKf2i OHTU+XwZBlVRJvhtfNEOb/w= X-Google-Smtp-Source: ABdhPJxlwwGflbFW+JWNzye5OMBC7kYwK0WlIQYLaUXJSUSSgf/5GsesaeqZjmcw/NEyzkxi1fryGA== X-Received: by 2002:a2e:998e:: with SMTP id w14mr9988489lji.100.1606732011004; Mon, 30 Nov 2020 02:26:51 -0800 (PST) Received: from [10.0.1.3] ([194.39.99.206]) by smtp.gmail.com with ESMTPSA id t138sm2411537lff.183.2020.11.30.02.26.49 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Mon, 30 Nov 2020 02:26:50 -0800 (PST) From: Alexander Okonnikov Message-Id: <5D89BE28-934A-4EE3-915A-456AAD7AC59C@gmail.com> Content-Type: multipart/alternative; boundary="Apple-Mail=_A76221E0-EB67-4088-A9E1-170233FBDB86" Mime-Version: 1.0 (Mac OS X Mail 13.4 \(3608.120.23.2.4\)) Date: Mon, 30 Nov 2020 13:26:49 +0300 In-Reply-To: <57b88873-b0e9-c2d3-2732-7f2629eebf27@cisco.com> Cc: lsr@ietf.org To: Peter Psenak References: <61201EB5-3F36-401A-9D39-FB0C577C7966@gmail.com> <3d3d863b-3e1f-ea87-0c45-09e119aa7c8f@cisco.com> <3FE4F6F8-6819-425E-852F-6B5B968ECAF5@gmail.com> <57b88873-b0e9-c2d3-2732-7f2629eebf27@cisco.com> X-Mailer: Apple Mail (2.3608.120.23.2.4) Archived-At: Subject: Re: [Lsr] Link Data value for Multi-area links X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 30 Nov 2020 10:26:55 -0000 --Apple-Mail=_A76221E0-EB67-4088-A9E1-170233FBDB86 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 Hi Peter, > 30 =D0=BD=D0=BE=D1=8F=D0=B1. 2020 =D0=B3., =D0=B2 12:56, Peter Psenak = =D0=BD=D0=B0=D0=BF=D0=B8=D1=81=D0=B0=D0=BB(=D0=B0): >=20 > Hi Alex, >=20 > On 27/11/2020 13:49, Alexander Okonnikov wrote: >> Hi Peter, >> Which kind of ambiguity is meant? In case of numbered point-to-point = each link has its own unique IP address, so there is no ambiguity. >> Per my understanding this problem has appeared due to follow reasons: >> 1) In old versions of the draft (up to -05) it was proposed that = multi-area links are treated as unnumbered. ifIndex to be encoded in = Link Data field, irrespectively whether interface has its own IP address = (numbered) or borrow it (unnumbered); >> 2) =46rom -06 to -08 multi-area links are still treated as = unnumbered, but if interface is numbered, then IP address of the = neighbor (rather than local one) to be encoded into Link Data, in order = to make the link look like unnumbered; >> 3) In version -09 of the draft and in RFC 5185 itself there is no = more mentions that multi-area link to be treated as unnumbered. Rather, = another approach is used - if router's interface is numbered, then link = is also numbered; if router's interface is unnumbered, then link is = unnumbered. The rule that specifies omitting corresponding type 3 link = is added. Mention of 'unnumbered' link is also removed from section 3 in = RFC 5185. > >> Hence, in version -09 with removing unnumbered nature of multi-area = links Link Data for numbered links had to be changed from Neighbor's IP = address to own IP address, as it is specified in RFC 2328. =46rom = perspective of other routers this link can be treated as numbered or = unnumbered, depending on configuration of neighbor's corresponding = interface. >=20 > you are free to advertise the link as unnumbered. RFC5185 is not = mandating to send IP address really. The same valid for numbered ones. I.e. I'm free to advertise the link as = numbered. This is straightforward when the link is numbered indeed. And = if we would prefer to have deal with unnumbered interfaces, we would not = need RFC 5185 (section 1.2). >> One question - how neighboring router will perform next-hop = calculation (in case it needs to do so)? If neighbor is configured with = numbered interface, it will treat Link Data as IP next hop, which will = be its own IP interface address. >> Another question - how router will be able to match Link TLV (RFC = 3630) to corresponding Link in Router LSA? For example, we want to = calculate RSVP-TE LSP based on IGP metric (RFC 3785) and thus router = needs to match IGP link to TE link. >=20 > I don't believe you are going to do any traffic engineering over a = multi-area adjacency. MADJ is there to address the OSPF route preference = rules that may lead to sub-optimal routing. MADJ link is not advertised = for TE purposes. Why not? We need multi-area configuration and at the same time we need = ability to build intra-area RSVP-TE LSPs within each of areas. And what = about calculating IP next hop? Which compatibility is meant in section = 3? > thanks, > Peter Thank you. >> Thank you. >>> 27 =D0=BD=D0=BE=D1=8F=D0=B1. 2020 =D0=B3., =D0=B2 14:50, Peter = Psenak =D0=BD=D0=B0=D0=BF=D0=B8=D1=81=D0=B0=D0=BB(=D0=B0= ): >>>=20 >>> Alexander, >>>=20 >>> On 26/11/2020 17:58, Alexander Okonnikov wrote: >>>> Hi WG, >>>> RFC 5185 says that Neighbor's IP address to be encoded into Link = Data field. Per RFC 2328 router's own IP address to be encoded into Link = Data. What is the reason to advertise neighbor's IP address for = multi-area links and not local IP address? It seems like bug. Could = someone comment on this? >>>=20 >>> Advertising a neighbor address/ifindex helps to eliminate ambiguity = in case of parallel point-to-point adjacencies. It's not perfect, but = that's how it was specified. So it's not a bug. >>>=20 >>> thanks, >>> Peter >>>=20 >>>> Thanks in advance. >>>> _______________________________________________ >>>> Lsr mailing list >>>> Lsr@ietf.org >>>> https://www.ietf.org/mailman/listinfo/lsr --Apple-Mail=_A76221E0-EB67-4088-A9E1-170233FBDB86 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8 Hi = Peter,

30 =D0=BD=D0=BE=D1=8F=D0=B1. 2020 =D0=B3., =D0=B2= 12:56, Peter Psenak <ppsenak@cisco.com> =D0=BD=D0=B0=D0=BF=D0=B8=D1=81=D0=B0=D0= =BB(=D0=B0):

Hi Alex,

On 27/11/2020 13:49, Alexander Okonnikov wrote:
Hi Peter,
Which kind of = ambiguity is meant? In case of numbered point-to-point each link has its = own unique IP address, so there is no ambiguity.
Per my = understanding this problem has appeared due to follow reasons:
1) In old versions of the draft (up to -05) it was proposed = that multi-area links are treated as unnumbered. ifIndex to be encoded = in Link Data field, irrespectively whether interface has its own IP = address (numbered) or borrow it (unnumbered);
2) =46rom = -06 to -08 multi-area links are still treated as unnumbered, but if = interface is numbered, then IP address of the neighbor (rather than = local one) to be encoded into Link Data, in order to make the link look = like unnumbered;
3) In version -09 of the draft and in RFC = 5185 itself there is no more mentions that multi-area link to be treated = as unnumbered. Rather, another approach is used - if router's interface = is numbered, then link is also numbered; if router's interface is = unnumbered, then link is unnumbered. The rule that specifies omitting = corresponding type 3 link is added. Mention of 'unnumbered' link is also = removed from section 3 in RFC 5185. >
Hence, in version = -09 with removing unnumbered nature of multi-area links Link Data for = numbered links had to be changed from Neighbor's IP address to own IP = address, as it is specified in RFC 2328. =46rom perspective of other = routers this link can be treated as numbered or unnumbered, depending on = configuration of neighbor's corresponding interface.

you are free to advertise the link as unnumbered. RFC5185 is = not mandating to send IP address really.

The same valid = for numbered ones. I.e. I'm free to advertise the link as numbered. This = is straightforward when the link is numbered indeed. And if we would = prefer to have deal with unnumbered interfaces, we would not need RFC = 5185 (section 1.2).

One question - how neighboring router = will perform next-hop calculation (in case it needs to do so)? If = neighbor is configured with numbered interface, it will treat Link Data = as IP next hop, which will be its own IP interface address.
Another question - how router will be able to match Link TLV = (RFC 3630) to corresponding Link in Router LSA? For example, we want to = calculate RSVP-TE LSP based on IGP metric (RFC 3785) and thus router = needs to match IGP link to TE link.

I don't believe you are going to do any traffic engineering = over a multi-area adjacency. MADJ is there to address the OSPF route = preference rules that may lead to sub-optimal routing. MADJ link is not = advertised for TE purposes.

Why not? We need multi-area configuration and at the = same time we need ability to build intra-area RSVP-TE LSPs within each = of areas. And what about calculating IP next hop? Which compatibility is = meant in section 3?

thanks,
Peter

Thank you.

Thank = you.
27 =D0=BD=D0=BE=D1= =8F=D0=B1. 2020 =D0=B3., =D0=B2 14:50, Peter Psenak <ppsenak@cisco.com> = =D0=BD=D0=B0=D0=BF=D0=B8=D1=81=D0=B0=D0=BB(=D0=B0):

Alexander,

On 26/11/2020 17:58, = Alexander Okonnikov wrote:
Hi WG,
RFC 5185 says that Neighbor's IP address = to be encoded into Link Data field. Per RFC 2328 router's own IP address = to be encoded into Link Data. What is the reason to advertise neighbor's = IP address for multi-area links and not local IP address? It seems like = bug. Could someone comment on this?

Advertising a neighbor address/ifindex helps to eliminate = ambiguity in case of parallel point-to-point adjacencies. It's not = perfect, but that's how it was specified. So it's not a bug.

thanks,
Peter

Thanks in advance.
_______________________________________________
Lsr mailing list
Lsr@ietf.org
https://www.ietf.org/mailman/listinfo/lsr

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Subject: Re: [Lsr] Link Data value for Multi-area links X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 30 Nov 2020 17:01:05 -0000 --_000_F386F007BA5144B6979518DE3E564D75ciscocom_ Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 SGkgQWxleCwNCg0KTXVsdGktQXJlYSBpbnRlcmZhY2UgZGlzYW1iaWd1YXRpb24gaXMgcmVxdWly ZWQgdG8gc3VwcG9ydCB0aGUgT1NQRiBNSUIgYXMgc3BlY2lmaWVkIGluIFJGQyA0NzUwLiBUaGUg dGFibGUgaW5kZXhpbmcgZG9lc27igJl0IGluY2x1ZGUgdGhlIGFyZWEuIEZvciBleGFtcGxlOg0K DQotLSAgT1NQRiBJbnRlcmZhY2UgVGFibGUNCg0KICBvc3BmSWZUYWJsZSBPQkpFQ1QtVFlQRQ0K ICAgICAgIFNZTlRBWCAgICAgICBTRVFVRU5DRSBPRiBPc3BmSWZFbnRyeQ0KICAgICAgIE1BWC1B Q0NFU1MgICBub3QtYWNjZXNzaWJsZQ0KICAgICAgIFNUQVRVUyAgICAgICBjdXJyZW50DQogICAg ICAgREVTQ1JJUFRJT04NCiAgICAgICAgICAiVGhlIE9TUEYgSW50ZXJmYWNlIFRhYmxlIGRlc2Ny 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[10.0.1.3] ([194.39.99.206]) by smtp.gmail.com with ESMTPSA id h2sm2419360lfc.76.2020.11.30.09.47.06 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Mon, 30 Nov 2020 09:47:06 -0800 (PST) From: Alexander Okonnikov Message-Id: Content-Type: multipart/alternative; boundary="Apple-Mail=_DD054582-A014-4CC6-AF11-30CB73D93E04" Mime-Version: 1.0 (Mac OS X Mail 13.4 \(3608.120.23.2.4\)) Date: Mon, 30 Nov 2020 20:47:05 +0300 In-Reply-To: Cc: "Acee Lindem (acee)" , "Peter Psenak (ppsenak)" , "lsr@ietf.org" To: "Van De Velde, Gunter (Nokia - BE/Antwerp)" References: <61201EB5-3F36-401A-9D39-FB0C577C7966@gmail.com> <3d3d863b-3e1f-ea87-0c45-09e119aa7c8f@cisco.com> <3FE4F6F8-6819-425E-852F-6B5B968ECAF5@gmail.com> <57b88873-b0e9-c2d3-2732-7f2629eebf27@cisco.com> <5D89BE28-934A-4EE3-915A-456AAD7AC59C@gmail.com> X-Mailer: Apple Mail (2.3608.120.23.2.4) Archived-At: Subject: Re: [Lsr] Link Data value for Multi-area links X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 30 Nov 2020 17:47:14 -0000 --Apple-Mail=_DD054582-A014-4CC6-AF11-30CB73D93E04 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 Hi Acee, RFC 5185 says that interface data structure is created for each = multi-area adjacency. I guess that we are not allowed to allocate = several ifIndex values for the same IP interface, because it is property = of router's interface, not OSPF interface. Hence, we have several OSPF = interfaces with the same ifIndex in unnumbered case and, thus, ambiguity = in Interface table. The same for numbered - we have IP interface address = (one), which is the same for multiple OSPF interfaces, and we again = obtain ambiguity. Per my understanding advertising neighbor's IP address = (or ifIndex) in Link Data doesn't help here. > 30 =D0=BD=D0=BE=D1=8F=D0=B1. 2020 =D0=B3., =D0=B2 20:20, Van De Velde, = Gunter (Nokia - BE/Antwerp) = =D0=BD=D0=B0=D0=BF=D0=B8=D1=81=D0=B0=D0=BB(=D0=B0): >=20 > The oddnes is that the architecture decision in RFC5185 to select = remote-ip-address instead of local-ip-address for the =E2=80=98Link = Data=E2=80=99 is making things much more complicated. > I am surprised to see that using the remote-ip-address is seen as the = =E2=80=98better=E2=80=99 choice as selecting local-ip-address. To me it = seems as a worse choice. > =20 > A question that was asked: How router will be able to match Link TLV = (RFC 3630) to corresponding Link in Router LSA? > =20 > Answer: > For unnumbered links we can match Link TLV with Router TLV using the = IfIndex when there is no stub type 3 link (=3Deasy) > For numbered: > we must first look if the there is a stub type 3 link > If stub type 3 exists, then the RFC3630 local ip address must be used = to identify the correspond link within the router TLV to the neighbor > If the stub type 3 link did not exist in Router TLV link, then the = maybe the link is unnumbered, and we try to match upon IfIndex=E2=80=A6 = This may give a match or no match > If there is no match, then maybe the link is MADJ and we must use the = RFC3630 remote IP address to match upon the Link Data > =3D over-complex. (If we used for RFC5185 =E2=80=98Link Data =3D = local ip address=E2=80=99 then (2) would given answer directly) > =20 > In addition, for a router it is much simpler to learn and advertise = local-ip-address in Router LSAs then using a remote-ip-address. > I also believe that if we want to search something in TEDB after = receiving a TE Link TLV. How can we identify from the TE Link TLV if = multi-area or not multi-area? If we can not, then how can we create the = correct key? > =20 > Looking at the above, the choice of using remote-ip-address for = RFC5185 Link Data seems not the best design that we can do, and is = adding OSPF complexity without benefits. > =20 > Should this not be corrected in RFC5185 and simply use = local-ip-address instead of the remote-ip-address for Multi-area Link = Data and avoid the additional unnecessary complexity the current RFC for = numbered links? > =20 > Brgds, > G/ > =20 > =20 > From: Lsr On Behalf Of Acee Lindem (acee) > Sent: Monday, November 30, 2020 18:01 > To: Alexander Okonnikov ; Peter Psenak = (ppsenak) > Cc: lsr@ietf.org > Subject: Re: [Lsr] Link Data value for Multi-area links > =20 > Hi Alex,=20 > =20 > Multi-Area interface disambiguation is required to support the OSPF = MIB as specified in RFC 4750. The table indexing doesn=E2=80=99t include = the area. For example: > =20 > -- OSPF Interface Table > =20 > ospfIfTable OBJECT-TYPE > SYNTAX SEQUENCE OF OspfIfEntry > MAX-ACCESS not-accessible > STATUS current > DESCRIPTION > "The OSPF Interface Table describes the interfaces > from the viewpoint of OSPF. > It augments the ipAddrTable with OSPF specific information." > REFERENCE > "OSPF Version 2, Appendix C.3 Router interface > parameters" > ::=3D { ospf 7 } > =20 > ospfIfEntry OBJECT-TYPE > SYNTAX OspfIfEntry > MAX-ACCESS not-accessible > STATUS current > DESCRIPTION > "The OSPF interface entry describes one interface > from the viewpoint of OSPF. > =20 > Information in this table is persistent and when this object > is written the entity SHOULD save the change to non-volatile > storage." > INDEX { ospfIfIpAddress, ospfAddressLessIf } > ::=3D { ospfIfTable 1 } > =20 > Note that if you really want to support this optimally, you could use = a separate subnet pre-area and have adjacencies on secondary addresses. = My Redback/Ericsson implementation allowed for this. =20 > =20 > Thanks, > Acee > =20 > =20 > From: Lsr > on = behalf of Alexander Okonnikov > > Date: Monday, November 30, 2020 at 5:27 AM > To: "Peter Psenak (ppsenak)" > > Cc: "lsr@ietf.org " > > Subject: Re: [Lsr] Link Data value for Multi-area links > =20 > Hi Peter, > =20 >=20 > 30 =D0=BD=D0=BE=D1=8F=D0=B1. 2020 =D0=B3., =D0=B2 12:56, Peter Psenak = > =D0=BD=D0=B0=D0=BF=D0=B8=D1= =81=D0=B0=D0=BB(=D0=B0): > =20 > Hi Alex, >=20 > On 27/11/2020 13:49, Alexander Okonnikov wrote: >=20 > Hi Peter, > Which kind of ambiguity is meant? In case of numbered point-to-point = each link has its own unique IP address, so there is no ambiguity. > Per my understanding this problem has appeared due to follow reasons: > 1) In old versions of the draft (up to -05) it was proposed that = multi-area links are treated as unnumbered. ifIndex to be encoded in = Link Data field, irrespectively whether interface has its own IP address = (numbered) or borrow it (unnumbered); > 2) =46rom -06 to -08 multi-area links are still treated as unnumbered, = but if interface is numbered, then IP address of the neighbor (rather = than local one) to be encoded into Link Data, in order to make the link = look like unnumbered; > 3) In version -09 of the draft and in RFC 5185 itself there is no more = mentions that multi-area link to be treated as unnumbered. Rather, = another approach is used - if router's interface is numbered, then link = is also numbered; if router's interface is unnumbered, then link is = unnumbered. The rule that specifies omitting corresponding type 3 link = is added. Mention of 'unnumbered' link is also removed from section 3 in = RFC 5185. > > Hence, in version -09 with removing unnumbered nature of multi-area = links Link Data for numbered links had to be changed from Neighbor's IP = address to own IP address, as it is specified in RFC 2328. =46rom = perspective of other routers this link can be treated as numbered or = unnumbered, depending on configuration of neighbor's corresponding = interface. >=20 > you are free to advertise the link as unnumbered. RFC5185 is not = mandating to send IP address really. > =20 > The same valid for numbered ones. I.e. I'm free to advertise the link = as numbered. This is straightforward when the link is numbered indeed. = And if we would prefer to have deal with unnumbered interfaces, we would = not need RFC 5185 (section 1.2). > =20 >=20 > One question - how neighboring router will perform next-hop = calculation (in case it needs to do so)? If neighbor is configured with = numbered interface, it will treat Link Data as IP next hop, which will = be its own IP interface address. > Another question - how router will be able to match Link TLV (RFC = 3630) to corresponding Link in Router LSA? For example, we want to = calculate RSVP-TE LSP based on IGP metric (RFC 3785) and thus router = needs to match IGP link to TE link. >=20 > I don't believe you are going to do any traffic engineering over a = multi-area adjacency. MADJ is there to address the OSPF route preference = rules that may lead to sub-optimal routing. MADJ link is not advertised = for TE purposes. > =20 > Why not? We need multi-area configuration and at the same time we need = ability to build intra-area RSVP-TE LSPs within each of areas. And what = about calculating IP next hop? Which compatibility is meant in section = 3? > =20 > thanks, > Peter > =20 > Thank you. > =20 >=20 > Thank you. >=20 > 27 =D0=BD=D0=BE=D1=8F=D0=B1. 2020 =D0=B3., =D0=B2 14:50, Peter Psenak = > =D0=BD=D0=B0=D0=BF=D0=B8=D1= =81=D0=B0=D0=BB(=D0=B0): >=20 > Alexander, >=20 > On 26/11/2020 17:58, Alexander Okonnikov wrote: >=20 > Hi WG, > RFC 5185 says that Neighbor's IP address to be encoded into Link Data = field. Per RFC 2328 router's own IP address to be encoded into Link = Data. What is the reason to advertise neighbor's IP address for = multi-area links and not local IP address? It seems like bug. Could = someone comment on this? >=20 > Advertising a neighbor address/ifindex helps to eliminate ambiguity in = case of parallel point-to-point adjacencies. It's not perfect, but = that's how it was specified. So it's not a bug. >=20 > thanks, > Peter >=20 >=20 > Thanks in advance. > _______________________________________________ > Lsr mailing list > Lsr@ietf.org > https://www.ietf.org/mailman/listinfo/lsr = --Apple-Mail=_DD054582-A014-4CC6-AF11-30CB73D93E04 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8 Hi = Acee,

RFC 5185 says that interface data structure is created for = each multi-area adjacency. I guess that we are not allowed to allocate = several ifIndex values for the same IP interface, because it is property = of router's interface, not OSPF interface. Hence, we have several OSPF = interfaces with the same ifIndex in unnumbered case and, thus, ambiguity = in Interface table. The same for numbered - we have IP interface address = (one), which is the same for multiple OSPF interfaces, and we again = obtain ambiguity. Per my understanding advertising neighbor's IP address = (or ifIndex) in Link Data doesn't help here.

30 = =D0=BD=D0=BE=D1=8F=D0=B1. 2020 =D0=B3., =D0=B2 20:20, Van De Velde, = Gunter (Nokia - BE/Antwerp) <gunter.van_de_velde@nokia.com> = =D0=BD=D0=B0=D0=BF=D0=B8=D1=81=D0=B0=D0=BB(=D0=B0):

The = oddnes is that the architecture decision in RFC5185 to select = remote-ip-address instead of local-ip-address for the =E2=80=98Link = Data=E2=80=99 is making things much more complicated.
I am = surprised to see that using the remote-ip-address is seen as the = =E2=80=98better=E2=80=99 choice as selecting local-ip-address. To me it = seems as a worse choice.
 
A question that was asked: How router will be able to match = Link TLV (RFC 3630) to corresponding Link in Router LSA?
 
Answer:
For = unnumbered links we can match Link TLV with Router TLV using the IfIndex = when there is no stub type 3 link (=3Deasy)
For = numbered:
  1. we must first look if the there = is a stub type 3 link
  2. If stub type 3 exists, then the = RFC3630 local ip address must be used to identify the correspond link = within the router TLV to the neighbor
  3. If the stub type 3 link did not = exist in Router TLV link, then the maybe the link is unnumbered, and we = try to match upon IfIndex=E2=80=A6 This may give a match or no match
  4. If = there is no match, then maybe the link is MADJ and we must use the = RFC3630 remote IP address to match upon the Link Data
  5. =3D = over-complex. (If we used  for RFC5185 =E2=80=98Link Data =3D local = ip address=E2=80=99 then (2) would given answer directly)
 
In = addition, for a router it is much simpler to learn and advertise = local-ip-address in Router LSAs then using a remote-ip-address.
I also believe that if we want to = search something in TEDB after receiving a TE Link TLV. How can we = identify from the TE Link TLV if multi-area or not multi-area? If we can = not, then how can we create the correct key?
 
Looking = at the above, the choice of using remote-ip-address for RFC5185 Link = Data seems not the best design that we can do, and is adding OSPF = complexity without benefits.
 
Should this not be corrected in RFC5185 = and simply use local-ip-address instead of the remote-ip-address for = Multi-area Link Data and avoid the additional unnecessary complexity the = current RFC for numbered links?
 
Brgds,
G/
 
 
From: Lsr= <lsr-bounces@ietf.org> On Behalf = Of Acee Lindem = (acee)
Sent: Monday, November 30, 2020 = 18:01
To: Alexander Okonnikov <alexander.okonnikov@gmail.com>; Peter Psenak (ppsenak) = <ppsenak@cisco.com>
Cc: lsr@ietf.org
Subject: Re: [Lsr] Link Data value = for Multi-area links
 
Hi Alex, 
 
Multi-Area = interface disambiguation is required to support the OSPF MIB as = specified in RFC 4750. The table indexing doesn=E2=80=99t include the = area. For example:
 
--  OSPF Interface Table
 
  ospfIfTable OBJECT-TYPE
       = SYNTAX       SEQUENCE OF OspfIfEntry
       MAX-ACCESS   = not-accessible
       = STATUS       current
       DESCRIPTION
          "The = OSPF Interface Table describes the interfaces
          from = the viewpoint of OSPF.
          It = augments the ipAddrTable with OSPF specific information."
       REFERENCE
          "OSPF = Version 2, Appendix C.3  Router interface
          = parameters"
       ::=3D { ospf 7 }
 
  = ospfIfEntry OBJECT-TYPE
       = SYNTAX       OspfIfEntry
       MAX-ACCESS   = not-accessible
       = STATUS       current
       DESCRIPTION
          "The = OSPF interface entry describes one interface
          from = the viewpoint of OSPF.
 
          = Information in this table is persistent and when this object
          is = written the entity SHOULD save the change to non-volatile
          = storage."
       INDEX { ospfIfIpAddress, ospfAddressLessIf }
       ::=3D { ospfIfTable 1 = }
 
Note that = if you really want to support this optimally, you could use a separate = subnet pre-area and have adjacencies on secondary addresses. My = Redback/Ericsson implementation allowed for this.   
 
Thanks,
Acee
 
 
From: Lsr <lsr-bounces@ietf.org> on = behalf of Alexander Okonnikov <alexander.okonnikov@gmail.com>
Date: Monday, November 30, = 2020 at 5:27 AM
To: "Peter Psenak = (ppsenak)" <ppsenak@cisco.com>Cc: "lsr@ietf.org" <lsr@ietf.org>
Subject: Re: [Lsr] Link Data = value for Multi-area links
 
Hi Peter,

 

30 =D0=BD=D0=BE=D1=8F=D0=B1. 2020 =D0=B3., =D0=B2 = 12:56, Peter Psenak <ppsenak@cisco.com> =D0=BD=D0=B0=D0=BF=D0=B8=D1=81=D0=B0=D0= =BB(=D0=B0):
 

Hi Alex,

On 27/11/2020 13:49, Alexander Okonnikov = wrote:

Hi Peter,
Which = kind of ambiguity is meant? In case of numbered point-to-point each link = has its own unique IP address, so there is no ambiguity.
Per= my understanding this problem has appeared due to follow reasons:
1) In old versions of the draft (up to -05) it was proposed = that multi-area links are treated as unnumbered. ifIndex to be encoded = in Link Data field, irrespectively whether interface has its own IP = address (numbered) or borrow it (unnumbered);
2) =46rom = -06 to -08 multi-area links are still treated as unnumbered, but if = interface is numbered, then IP address of the neighbor (rather than = local one) to be encoded into Link Data, in order to make the link look = like unnumbered;
3) In version -09 of the draft and in RFC = 5185 itself there is no more mentions that multi-area link to be treated = as unnumbered. Rather, another approach is used - if router's interface = is numbered, then link is also numbered; if router's interface is = unnumbered, then link is unnumbered. The rule that specifies omitting = corresponding type 3 link is added. Mention of 'unnumbered' link is also = removed from section 3 in RFC 5185. >
Hence, in version = -09 with removing unnumbered nature of multi-area links Link Data for = numbered links had to be changed from Neighbor's IP address to own IP = address, as it is specified in RFC 2328. =46rom perspective of other = routers this link can be treated as numbered or unnumbered, depending on = configuration of neighbor's corresponding interface.

you are free to = advertise the link as unnumbered. RFC5185 is not mandating to send IP = address really.
 
The same valid for numbered ones. I.e. I'm free to advertise = the link as numbered. This is straightforward when the link is numbered = indeed. And if we would prefer to have deal with unnumbered interfaces, = we would not need RFC 5185 (section 1.2).

 

One question - how neighboring = router will perform next-hop calculation (in case it needs to do so)? If = neighbor is configured with numbered interface, it will treat Link Data = as IP next hop, which will be its own IP interface address.
Another question - how router will be able to match Link TLV = (RFC 3630) to corresponding Link in Router LSA? For example, we want to = calculate RSVP-TE LSP based on IGP metric (RFC 3785) and thus router = needs to match IGP link to TE link.

I don't believe = you are going to do any traffic engineering over a multi-area adjacency. = MADJ is there to address the OSPF route preference rules that may lead = to sub-optimal routing. MADJ link is not advertised for TE = purposes.
 
Why not? We need multi-area configuration and at the same = time we need ability to build intra-area RSVP-TE LSPs within each of = areas. And what about calculating IP next hop? Which compatibility is = meant in section 3?
 
thanks,
Peter
 
Thank you.

 

Thank you.

27 =D0=BD=D0=BE=D1=8F= =D0=B1. 2020 =D0=B3., =D0=B2 14:50, Peter Psenak <ppsenak@cisco.com> =D0=BD=D0=B0=D0=BF=D0=B8=D1= =81=D0=B0=D0=BB(=D0=B0):

Alexander,

On 26/11/2020 17:58, Alexander Okonnikov = wrote:

Hi WG,
RFC 5185 = says that Neighbor's IP address to be encoded into Link Data field. Per = RFC 2328 router's own IP address to be encoded into Link Data. What is = the reason to advertise neighbor's IP address for multi-area links and = not local IP address? It seems like bug. Could someone comment on = this?


Advertising a neighbor address/ifindex helps to eliminate = ambiguity in case of parallel point-to-point adjacencies. It's not = perfect, but that's how it was specified. So it's not a bug.

thanks,
Peter

Thanks in = advance.
_______________________________________________
Lsr mailing list
Lsr@ietf.org
https://www.ietf.org/mailman/listinfo/lsr

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Subject: Re: [Lsr] Link Data value for Multi-area links X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 30 Nov 2020 17:48:03 -0000 --_000_ED93174AF2214EE49FCF04442218628Dciscocom_ Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 WW91IGFyZSB3ZWxjb21lIHRvIHByb3Bvc2UgYW4gYWx0ZXJuYXRlIHNvbHV0aW9uIHdoaWNoIGNv dWxkIHBvc3NpYmx5IGJlIGFjY2VwdGVkIGFzIGEgQklTIGRvY3VtZW50LiBIb3dldmVyLCB0aGlz IGlzIG5vdCBzb21ldGhpbmcgdGhhdCBjYW4gYmUgc2ltcGx5IGNoYW5nZWQgaW4gYW4gRXJyYXRh IHRvIHJlZHVjZSB0aGUgY29tcGxleGl0eS4NClRoYW5rcywNCkFjZWUNCg0KRnJvbTogTHNyIDxs c3ItYm91bmNlc0BpZXRmLm9yZz4gb24gYmVoYWxmIG9mIEd1bnRlciBWYW4gZGUgVmVsZGUgPGd1 bnRlci52YW5fZGVfdmVsZGVAbm9raWEuY29tPg0KRGF0ZTogTW9uZGF5LCBOb3ZlbWJlciAzMCwg MjAyMCBhdCAxMjoyMSBQTQ0KVG86ICJBY2VlIExpbmRlbSAoYWNlZSkiIDxhY2VlPTQwY2lzY28u 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Subject: Re: [Lsr] Link Data value for Multi-area links X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 30 Nov 2020 17:58:05 -0000 --_000_10D19997F6CA45A2A5C3C14C8FD41069ciscocom_ Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 U3BlYWtpbmcgb24gV0cgbWVtYmVyOg0KDQpIaSBBbGV4LA0KSSBrbmV3IHRoaXMgd2FzIGNvbWlu Zy4gSW4gMjAwOCwgOTkuOSUgb2YgdGhlIHJlcXVpcmVtZW50cyB3ZXJlIGhhbmRsZWQgYnkgc3Vw cG9ydGluZyBhbiBpbnRlcmZhY2UgaW4gYSBwcmltYXJ5IGFyZWEgYW5kIG9uZSBvdGhlciBhcmVh LiBVc2luZyB0aGUgcmVtb3RlIElQIGFkZHJlc3MgZm9yIHRoZSBvdGhlciBhcmVhIGRvZXMgaGFu ZGxlIHRoaXMgY2FzZS4gQXMgSSBzdGF0ZWQgcHJldmlvdXNseSwgaWYgeW91IHN1cHBvcnQgT1NQ RiBhZGphY2VuY2llcyBvbiBzZWNvbmRhcnkgSVAgYWRkcmVzc2VzLCB0aGUgTUlCIGFuZCBvdGhl ciBjb21wbGV4aXRpZXMgYXJlIGFsbCB0YWtlbiBjYXJlIG9mIGFuZCB0aGF0IHdvdWxkIGJlIHRo 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(2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 4WsmqRcKtnuJ for ; Mon, 30 Nov 2020 12:21:58 -0800 (PST) Received: from mail-pf1-x42e.google.com (mail-pf1-x42e.google.com [IPv6:2607:f8b0:4864:20::42e]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 981683A0E1D for ; Mon, 30 Nov 2020 12:21:58 -0800 (PST) Received: by mail-pf1-x42e.google.com with SMTP id b10so9754660pfo.4 for ; Mon, 30 Nov 2020 12:21:58 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:from:date:message-id:subject:to; bh=AZcF1wG3RBcX2L9FiALHc9aJf2Fp2JOLnnszSy8WRIg=; b=uOIgFbqoiYDMAAhlYqvWosUvrobEXplJlwxHjnkyJMUsHeJKOhfGNpHI3BxYh+P4Ba nJJvEWiM962L/sZxJlgVzteE6PbWAcXKWH6AO/53qegI2uUHIYpXJfFwfHDBwBetwFP9 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ABdhPJzFOhBMduaQp4tSagBDszFSdgCGqoNwzFvoKwY9nv68IQPKmdYS+B97zgw52vr5/jrnQ+/kVw3lffnzyM0PNj4= X-Received: by 2002:a65:4241:: with SMTP id d1mr18988563pgq.18.1606767717574; Mon, 30 Nov 2020 12:21:57 -0800 (PST) MIME-Version: 1.0 From: Gyan Mishra Date: Mon, 30 Nov 2020 15:21:47 -0500 Message-ID: To: lsr Content-Type: multipart/alternative; boundary="0000000000000af2e305b558c3a6" Archived-At: Subject: [Lsr] IPv6 Flow Label QOS marking support for 5-tuple ECMP / LAG / MLAG hash X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 30 Nov 2020 20:22:01 -0000 --0000000000000af2e305b558c3a6 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Dear LSR WG experts, Does anyone know if vendors have started or plan to start supporting IPv6 flow label 5-tuple dscp marking for ECMP hashing. IPv6 flow label support for ECMP https://tools.ietf.org/html/rfc6437 IPv4 has traditionally always utilized recommended BCP of flow based load balancing due to issues related to out of order and reordering of packets. Although per packet load balancing is supported by most vendors it is not recommended due to forwarding plane impact. This IPv6 flow label feature of 5-tuple hash provides significant advantages for operators much needed ECMP load balancing entropy as compare to traditional =E2=80=9Cflow or session=E2=80=9D based load balancing which= is the case as well with MPLS entropy label RFC 6790 load balancing contrasted below. IPv6 flow label has significant benefits for operators deploying SRv6 which utilizes the IPv6 data plane to now have =E2=80=9Cnative=E2=80=9D bui= lt in ECMP entropy as part of the protocol as compare to its predecessor IPv4. This gives SRv6 another significant edge over MPLS predecessor. Excerpt from RFC 6437: Forwarding nodes such as routers and load distributors MUST NOT depend only on Flow Label values being uniformly distributed. In any usage such as a hash key for load distribution, the Flow Label bits MUST be combined at least with bits from other sources within the packet, so as to produce a constant hash value for each flow and a suitable distribution of hash values across flows. Typically, the other fields used will be some or all components of the usual 5-tuple. In this way, load distribution will still occur even if the Flow Label values are poorly distributed. Although uniformly distributed flow label values are recommended below, and will always be helpful for load distribution, it is unsafe to assume their presence in the general case, and the use case needs to work even if the flow label value is zero. As a general practice, packet flows should not be reordered, and the use of the Flow Label field does not affect this. In particular, a Flow label value of zero does not imply that reordering is acceptable. Below comparison of IPv6 flow label benefits over MPLS entropy label: ! MPLS Entropy label https://tools.ietf.org/html/rfc6790 As a comparison to MPLS entropy label, the mpls entropy label reduces the control plane label binding and LFIB forwarding plane data structure by not having a per ECMP path label allocation per FEC by adding an additional entropy label to the label stack. However MPLS entropy label is still uses the traditional flow or session based load balancing algorithm which results in uneven load balancing. Kind Regards Gyan --=20 *Gyan Mishra* *Network Solutions A**rchitect * *M 301 502-134713101 Columbia Pike *Silver Spring, MD --0000000000000af2e305b558c3a6 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

Dear LSR WG experts,


Does= anyone know if vendors have started or plan to start supporting IPv6 flow = label 5-tuple dscp marking for ECMP hashing. =C2=A0

IPv6 flow label support for ECMP

<= /div>

IPv4 has traditionally a= lways utilized recommended BCP of flow based load balancing due to issues r= elated to out of order and reordering of packets.=C2=A0 Although per packet= load balancing is supported by most vendors it is not recommended due to f= orwarding plane impact.

= This IPv6 flow label feature of 5-tuple hash provides significant advantage= s for operators much needed ECMP load balancing entropy as compare to tradi= tional =E2=80=9Cflow or session=E2=80=9D based load balancing which is the = case as well with MPLS entropy label RFC 6790 load balancing contrasted bel= ow.

IPv6 flow label has = significant =C2=A0benefits for operators deploying =C2=A0SRv6 which utilize= s the IPv6 data plane to now have =E2=80=9Cnative=E2=80=9D built in ECMP en= tropy as part of the protocol as compare to its predecessor IPv4. =C2=A0

This gives SRv6 another si= gnificant edge over MPLS predecessor.

Excerpt from RFC 6437:

    =
  Forwarding nodes such as routers and load distributors MUST NOT
      depend only on Flow Label values being uniformly distributed.  In
      any usage such as a hash key for load distribution, the Flow Label
      bits MUST be combined at least with bits from other sources within
      the packet, so as to produce a constant hash value for each flow
      and a suitable distribution of hash values across flows.
      Typically, the other fields used will be some or all components of
      the usual 5-tuple.  In this way, load distribution will still
      occur even if the Flow Label values are poorly distributed.

   Although uniformly distributed flow label values are recommended
   below, and will always be helpful for load distribution, it is unsafe
   to assume their presence in the general case, and the use case needs
   to work even if the flow label value is zero.

   As a general practice, packet flows should not be reordered, and the
   use of the Flow Label field does not affect this.  In particular, a
   Flow label value of zero does not imply that reordering is
   acceptable.

= 

Below comparison of IPv6 flow label b=
enefits over MPLS entropy label:


! MPLS Entropy labe= l 



As a compariso=
n to MPLS entropy label, the mpls entropy label reduces the control plane l=
abel binding and LFIB forwarding plane data structure by not having a per E=
CMP path label allocation per FEC by adding an additional entropy label to =
the label stack.

However M=
PLS entropy label is still uses the traditional flow or session based load =
balancing algorithm which results in 
uneven load balancing.  


Kind Regards 

Gyan


--

<= a href=3D"http://www.verizon.com/" style=3D"color:rgb(17,85,204);padding-bo= ttom:1em;display:inline-block" target=3D"_blank">

Gyan Mishra

Network Solutions Architect=C2=A0

To: Gyan Mishra , lsr Thread-Topic: [Lsr] IPv6 Flow Label QOS marking support for 5-tuple ECMP / LAG / MLAG hash Thread-Index: AQHWx1aGLrP0R4SziUKJFn1wBaYj36ngzzGA Date: Mon, 30 Nov 2020 20:39:08 +0000 Message-ID: <6D7A677C-86BC-4A96-8C7B-70B0563631BE@cisco.com> References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: user-agent: Microsoft-MacOutlook/16.43.20110804 authentication-results: gmail.com; dkim=none (message not signed) header.d=none;gmail.com; dmarc=none action=none header.from=cisco.com; x-originating-ip: [136.56.133.70] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 0f5f4130-eab5-47af-538e-08d8956ffcec x-ms-traffictypediagnostic: BY5PR11MB4193: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:10000; x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: 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<6D7A677C-86BC-4A96-8C7B-70B0563631BE@cisco.com> In-Reply-To: <6D7A677C-86BC-4A96-8C7B-70B0563631BE@cisco.com> From: Gyan Mishra Date: Mon, 30 Nov 2020 15:51:29 -0500 Message-ID: To: "Acee Lindem (acee)" Cc: lsr Content-Type: multipart/alternative; boundary="000000000000044d9005b55944ca" Archived-At: Subject: Re: [Lsr] IPv6 Flow Label QOS marking support for 5-tuple ECMP / LAG / MLAG hash X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 30 Nov 2020 20:58:05 -0000 --000000000000044d9005b55944ca Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Thanks Acee. Gyan On Mon, Nov 30, 2020 at 3:39 PM Acee Lindem (acee) wrote: > Speaking as LSR Co-Chair: > > > > Hi Gyan, > > This is more a discussion for the 6MAN WG. Here is the charter for the LS= R > WG: https://datatracker.ietf.org/wg/lsr/about/ > > No need to cross-post to the LSR list=E2=80=A6 > > Thanks, > > Acee > > > > *From: *Lsr on behalf of Gyan Mishra < > hayabusagsm@gmail.com> > *Date: *Monday, November 30, 2020 at 3:22 PM > *To: *lsr > *Subject: *[Lsr] IPv6 Flow Label QOS marking support for 5-tuple ECMP / > LAG / MLAG hash > > > > > > Dear LSR WG experts, > > > > > > Does anyone know if vendors have started or plan to start supporting IPv6 > flow label 5-tuple dscp marking for ECMP hashing. > > > > IPv6 flow label support for ECMP > > > > https://tools.ietf.org/html/rfc6437 > > > > IPv4 has traditionally always utilized recommended BCP of flow based load > balancing due to issues related to out of order and reordering of packets= . > Although per packet load balancing is supported by most vendors it is not > recommended due to forwarding plane impact. > > > > This IPv6 flow label feature of 5-tuple hash provides significant > advantages for operators much needed ECMP load balancing entropy as compa= re > to traditional =E2=80=9Cflow or session=E2=80=9D based load balancing whi= ch is the case as > well with MPLS entropy label RFC 6790 load balancing contrasted below. > > > > IPv6 flow label has significant benefits for operators deploying SRv6 > which utilizes the IPv6 data plane to now have =E2=80=9Cnative=E2=80=9D b= uilt in ECMP > entropy as part of the protocol as compare to its predecessor IPv4. > > > > This gives SRv6 another significant edge over MPLS predecessor. > > > > Excerpt from RFC 6437: > > > > Forwarding nodes such as routers and load distributors MUST NOT > > depend only on Flow Label values being uniformly distributed. In > > any usage such as a hash key for load distribution, the Flow Label > > bits MUST be combined at least with bits from other sources within > > the packet, so as to produce a constant hash value for each flow > > and a suitable distribution of hash values across flows. > > Typically, the other fields used will be some or all components of > > the usual 5-tuple. In this way, load distribution will still > > occur even if the Flow Label values are poorly distributed. > > > > Although uniformly distributed flow label values are recommended > > below, and will always be helpful for load distribution, it is unsafe > > to assume their presence in the general case, and the use case needs > > to work even if the flow label value is zero. > > > > As a general practice, packet flows should not be reordered, and the > > use of the Flow Label field does not affect this. In particular, a > > Flow label value of zero does not imply that reordering is > > acceptable. > > > > > > Below comparison of IPv6 flow label benefits over MPLS entropy label: > > > > > > ! MPLS Entropy label > > https://tools.ietf.org/html/rfc6790 > > > > > > > > As a comparison to MPLS entropy label, the mpls entropy label reduces the= control plane label binding and LFIB forwarding plane data structure by no= t having a per ECMP path label allocation per FEC by adding an additional e= ntropy label to the label stack. > > > > > > However MPLS entropy label is still uses the traditional flow or session = based load balancing algorithm which results in > > uneven load balancing. > > > > > > Kind Regards > > > > Gyan > > > > > > -- > > [image: Image removed by sender.] > > *Gyan Mishra* > > *Network Solutions Architect * > > > > *M 301 502-1347 13101 Columbia Pike *Silver Spring, MD > > > --=20 *Gyan Mishra* *Network Solutions A**rchitect * *M 301 502-134713101 Columbia Pike *Silver Spring, MD --000000000000044d9005b55944ca Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

Thanks Acee.

Gyan

On Mon, Nov 30, = 2020 at 3:39 PM Acee Lindem (acee) <ac= ee@cisco.com> wrote:

Speaking as LSR Co-Chair:

=C2=A0

Hi Gyan,

This is more a discussion for the 6MAN WG. Here is t= he charter for the LSR WG: https://datatracker.ietf.org/wg/lsr/about/<= /u>

No need to cross-post to the LSR list=E2=80=A6

Thanks,

Acee

=C2=A0

From: Lsr <lsr-bounces@ietf.org> o= n behalf of Gyan Mishra <hayabusagsm@gmail.com>
Date: Monday, November 30, 2020 at 3:22 PM
To: lsr <lsr@ie= tf.org>
Subject: [Lsr] IPv6 Flow Label QOS marking support for 5-tuple ECMP = / LAG / MLAG hash

=C2=A0

=C2=A0

Dear LSR WG experts,<= /u>

=C2=A0

=C2=A0

Does anyone know if vend= ors have started or plan to start supporting IPv6 flow label 5-tuple dscp m= arking for ECMP hashing. =C2=A0

=C2=A0

IPv6 flow label support = for ECMP

=C2=A0

=C2=A0

IPv4 has traditionally a= lways utilized recommended BCP of flow based load balancing due to issues r= elated to out of order and reordering of packets.=C2=A0 Although per packet= load balancing is supported by most vendors it is not recommended due to forwarding plane impact.

=C2=A0

This IPv6 flow label fea= ture of 5-tuple hash provides significant advantages for operators much nee= ded ECMP load balancing entropy as compare to traditional =E2=80=9Cflow or = session=E2=80=9D based load balancing which is the case as well with MPLS entropy label RFC 6790 load balancing contrasted below.<= u>

=C2=A0

IPv6 flow label has sign= ificant =C2=A0benefits for operators deploying =C2=A0SRv6 which utilizes th= e IPv6 data plane to now have =E2=80=9Cnative=E2=80=9D built in ECMP entrop= y as part of the protocol as compare to its predecessor IPv4. =C2=A0=

=C2=A0

This gives SRv6 another = significant edge over MPLS predecessor.

=C2=A0

Excerpt from RFC 6437:

=C2=A0

=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Forwarding nodes such as routers and =
load distributors MUST NOT
=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0 depend only on Flow Label values being uniformly dist=
ributed.=C2=A0 In
=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0 any usage such as a hash key for load distribution, t=
he Flow Label
=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0 bits MUST be combined at least with bits from other s=
ources within
=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0 the packet, so as to produce a constant hash value fo=
r each flow
=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0 and a suitable distribution of hash values across flo=
ws.
=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0 Typically, the other fields used will be some or all =
components of
=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0 the usual 5-tuple.=C2=A0 In this way, load distributi=
on will still
=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0 occur even if the Flow Label values are poorly distri=
buted.
=C2=
=A0
=C2=A0=C2=
=A0 Although uniformly distributed flow label values are recommended=

=C2=A0=C2=
=A0 below, and will always be helpful for load distribution, it is unsafe
=C2=A0=C2=
=A0 to assume their presence in the general case, and the use case needs=

=C2=A0=C2=
=A0 to work even if the flow label value is zero.

=C2=
=A0


=C2=A0=C2=
=A0 As a general practice, packet flows should not be reordered, and the=



=C2=A0=C2=
=A0 use of the Flow Label field does not affect this.=C2=A0 In particular, =
a


=C2=A0=C2=
=A0 Flow label value of zero does not imply that reordering is


=C2=A0=C2=
=A0 acceptable.


=C2=A0


=C2=A0


Below comparison of IPv6 flow label benefits over MPLS entropy label=
:


=C2=A0


=C2=A0


! MPLS Entropy label 



=C2=
=A0


=C2=A0


=C2=A0


As a comparison to MPLS entropy label, the mpls entropy label reduce=
s the control plane label binding and LFIB forwarding plane data structure =
by not having a per ECMP path label allocation per FEC by adding an additio=
nal entropy label to the label stack.


=C2=A0


=C2=A0


However MPLS entropy label is still uses the traditional flow or ses=
sion based load balancing algorithm which results in <=
/pre>

uneven load balancing.=C2=A0 


=C2=A0


=C2=A0


Kind Regards 


=C2=A0


Gyan


=C2=A0

=C2=A0

--

3D"Image

Gyan Mishra<= /u>

Network Solutions = Architect=C2=A0

M 301 502-1347
13101 Columbia Pike=C2=A0
Silver Spring, MD

=C2=A0



--

Gyan Mishra

Network Solutions A= rchitect=C2= =A0

M 301 502-1347
13101 Columbia= Pike=C2=A0
Silver Spring, MD


<= /div>
--000000000000044d9005b55944ca-- From nobody Mon Nov 30 13:10:38 2020 Return-Path: X-Original-To: lsr@ietf.org Delivered-To: lsr@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 6DA033A11AD; Mon, 30 Nov 2020 13:10:36 -0800 (PST) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: Cc: lsr@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 7.23.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: lsr@ietf.org Message-ID: <160677063641.7444.3895998386256796985@ietfa.amsl.com> Date: Mon, 30 Nov 2020 13:10:36 -0800 Archived-At: Subject: [Lsr] I-D Action: draft-ietf-lsr-flooding-topo-min-degree-01.txt X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 30 Nov 2020 21:10:36 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Link State Routing WG of the IETF. Title : Flooding Topology Minimum Degree Algorithm Authors : Huaimo Chen Mehmet Toy Yi Yang Aijun Wang Xufeng Liu Yanhe Fan Lei Liu Filename : draft-ietf-lsr-flooding-topo-min-degree-01.txt Pages : 12 Date : 2020-11-30 Abstract: This document proposes an algorithm for a node to compute a flooding topology, which is a subgraph of the complete topology per underline physical network. When every node in an area automatically calculates a flooding topology by using a same algorithm and floods the link states using the flooding topology, the amount of flooding traffic in the network is greatly reduced. This would reduce convergence time with a more stable and optimized routing environment. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-lsr-flooding-topo-min-degree/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-lsr-flooding-topo-min-degree-01 https://datatracker.ietf.org/doc/html/draft-ietf-lsr-flooding-topo-min-degree-01 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-lsr-flooding-topo-min-degree-01 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ From nobody Mon Nov 30 13:23:30 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 722CA3A11BF for ; Mon, 30 Nov 2020 13:23:28 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.087 X-Spam-Level: X-Spam-Status: No, score=-2.087 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_REMOTE_IMAGE=0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id T4vsTR-tGieV for ; Mon, 30 Nov 2020 13:23:26 -0800 (PST) Received: from mail-pg1-x533.google.com (mail-pg1-x533.google.com [IPv6:2607:f8b0:4864:20::533]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 210F23A12D9 for ; Mon, 30 Nov 2020 13:23:14 -0800 (PST) Received: by mail-pg1-x533.google.com with SMTP id t37so10860784pga.7 for ; Mon, 30 Nov 2020 13:23:14 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=WbpExB0xfg0CzzWZZ8AuB+btBNO05AYq3+EZNSDgn7k=; b=u+W+62dDYjgcb2Iq8LV8KFE8w3IlciXP1oZ3YwTdTB7BQc5zZZWFXsb0c0pNvbywdm xRjY5jKctEpzgjEIgecddCWgJyEtclzJhEino2/tZfhR3/axSYDBLqarXQUClmiY3QKa vaZlQ2ch3Lh0C6vYGSoaZxezNoA6qh9shjiXyn8ZwWbph0AbEN663iphpVKFVJoPlpOB JfNrF2y5XGzU0mY2u0i04jh/tn5LQdXfgbawUXZj6GHYxuokMoPUsZhML2/O8/5v6EHh jbZDpCUxdSPVX4r4+wtoYvxjbft5dfuQlZW4IG406nrDqolSKOgZkLCON8784OlMsT4s VLtw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=WbpExB0xfg0CzzWZZ8AuB+btBNO05AYq3+EZNSDgn7k=; b=k/ejV0xGQLm//msHkoW/Oz68vjl715WH1vP3zuwapPKjksaD3lrAwNi64R2tUfQRui oFgw6gdVz7qeRYZ4heZwCW0P/Opw88E6RRj4wXD/Xt1R8//1rLoMiqCJc4nCHzF7FZYW aahHXednc/vVv8qLsOCProQ7vuPuEWayJy3Bj1hkH1u3FrzOVK8I0qGBAs81POcNsWAd mdiAYDELRdTMP3Uw6aCpXVjdf5SOfTFvvyvWkZQ10t/2d9eX3s/LMl+uMUIE0GdYM56T c6r/2zhUEt19lsVi2nGloDMsqkvHnFiIa4QNEfMgySlr4laskemBo6nFlAb1zbQNmC5P qCog== X-Gm-Message-State: AOAM531NnQJKzseFJkh9L9ZzNOB8Lv24fB7q33DmJMy43V/BgUKmAsUu bypSZCo50ZXI+3DlX3PHdyXaCVUAGBeEzYHcq8pVZnMHVVk= X-Google-Smtp-Source: ABdhPJwMQUJrqj/RnXwZAeZjMe3ggIUa4mgJK/koGpAZCoGyyQVKOK5iSzQeF0v+J6p+Ud370RcFpq7h27ryzG1AFR4= X-Received: by 2002:a65:4241:: with SMTP id d1mr19207672pgq.18.1606771393555; Mon, 30 Nov 2020 13:23:13 -0800 (PST) MIME-Version: 1.0 References: <6D7A677C-86BC-4A96-8C7B-70B0563631BE@cisco.com> In-Reply-To: <6D7A677C-86BC-4A96-8C7B-70B0563631BE@cisco.com> From: Gyan Mishra Date: Mon, 30 Nov 2020 16:16:41 -0500 Message-ID: To: "Acee Lindem (acee)" Cc: lsr Content-Type: multipart/alternative; boundary="00000000000025f11405b5599e73" Archived-At: Subject: Re: [Lsr] IPv6 Flow Label QOS marking support for 5-tuple ECMP / LAG / MLAG hash X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 30 Nov 2020 21:23:29 -0000 --00000000000025f11405b5599e73 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi Acee 6MAN deals with the IPv6 protocol specifications and not routing protocols in the ECMP load balancing framework. 6MAN would not have any idea if ISIS or OSPF AFI IPv6 5-tuple ECMP load balancing is supported and industry direction to support this critical feature from a IGP perspective. This question posed is in the context of LSR IGP load balancing framework, OSPF & ISIS AFI IPv6 use of RFC 6437 for 5-tuple hash ECMP load balancing for even 50/50 load balancing hash as opposed to router default flow or session based load balancing. Any feedback related in this context is much appreciated. Kind Regards Gyan On Mon, Nov 30, 2020 at 3:39 PM Acee Lindem (acee) wrote: > Speaking as LSR Co-Chair: > > > > Hi Gyan, > > This is more a discussion for the 6MAN WG. Here is the charter for the LS= R > WG: https://datatracker.ietf.org/wg/lsr/about/ > > No need to cross-post to the LSR list=E2=80=A6 > > Thanks, > > Acee > > > > *From: *Lsr on behalf of Gyan Mishra < > hayabusagsm@gmail.com> > *Date: *Monday, November 30, 2020 at 3:22 PM > *To: *lsr > *Subject: *[Lsr] IPv6 Flow Label QOS marking support for 5-tuple ECMP / > LAG / MLAG hash > > > > > > Dear LSR WG experts, > > > > > > Does anyone know if vendors have started or plan to start supporting IPv6 > flow label 5-tuple dscp marking for ECMP hashing. > > > > IPv6 flow label support for ECMP > > > > https://tools.ietf.org/html/rfc6437 > > > > IPv4 has traditionally always utilized recommended BCP of flow based load > balancing due to issues related to out of order and reordering of packets= . > Although per packet load balancing is supported by most vendors it is not > recommended due to forwarding plane impact. > > > > This IPv6 flow label feature of 5-tuple hash provides significant > advantages for operators much needed ECMP load balancing entropy as compa= re > to traditional =E2=80=9Cflow or session=E2=80=9D based load balancing whi= ch is the case as > well with MPLS entropy label RFC 6790 load balancing contrasted below. > > > > IPv6 flow label has significant benefits for operators deploying SRv6 > which utilizes the IPv6 data plane to now have =E2=80=9Cnative=E2=80=9D b= uilt in ECMP > entropy as part of the protocol as compare to its predecessor IPv4. > > > > This gives SRv6 another significant edge over MPLS predecessor. > > > > Excerpt from RFC 6437: > > > > Forwarding nodes such as routers and load distributors MUST NOT > > depend only on Flow Label values being uniformly distributed. In > > any usage such as a hash key for load distribution, the Flow Label > > bits MUST be combined at least with bits from other sources within > > the packet, so as to produce a constant hash value for each flow > > and a suitable distribution of hash values across flows. > > Typically, the other fields used will be some or all components of > > the usual 5-tuple. In this way, load distribution will still > > occur even if the Flow Label values are poorly distributed. > > > > Although uniformly distributed flow label values are recommended > > below, and will always be helpful for load distribution, it is unsafe > > to assume their presence in the general case, and the use case needs > > to work even if the flow label value is zero. > > > > As a general practice, packet flows should not be reordered, and the > > use of the Flow Label field does not affect this. In particular, a > > Flow label value of zero does not imply that reordering is > > acceptable. > > > > > > Below comparison of IPv6 flow label benefits over MPLS entropy label: > > > > > > ! MPLS Entropy label > > https://tools.ietf.org/html/rfc6790 > > > > > > > > As a comparison to MPLS entropy label, the mpls entropy label reduces the= control plane label binding and LFIB forwarding plane data structure by no= t having a per ECMP path label allocation per FEC by adding an additional e= ntropy label to the label stack. > > > > > > However MPLS entropy label is still uses the traditional flow or session = based load balancing algorithm which results in > > uneven load balancing. > > > > > > Kind Regards > > > > Gyan > > > > > > -- > > [image: Image removed by sender.] > > *Gyan Mishra* > > *Network Solutions Architect * > > > > *M 301 502-1347 13101 Columbia Pike *Silver Spring, MD > > > --=20 *Gyan Mishra* *Network Solutions A**rchitect * *M 301 502-134713101 Columbia Pike *Silver Spring, MD --00000000000025f11405b5599e73 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Acee

6MAN deals with the IPv6 protoc= ol specifications and not routing protocols in the ECMP load balancing fram= ework.=C2=A0=C2=A0

6MAN would not have any idea if= ISIS or OSPF AFI IPv6 5-tuple ECMP load balancing is supported and industr= y direction to support this critical feature from a IGP perspective.=C2=A0<= /div>

This question posed is in the context of LSR IGP l= oad balancing framework, OSPF & ISIS=C2=A0 AFI IPv6 use of RFC 6437 for= 5-tuple hash ECMP load balancing for even 50/50 load balancing hash as opp= osed to router default flow or session based load balancing.

=
Any feedback related in this context is=C2=A0 much appreciated.= =C2=A0

Kind Regards

Gyan<= /div>

On Mon, Nov 30, 2020 at 3:39 PM Acee Lindem (acee) <acee@cisco.com> wrote:

Speaking as LSR Co-Chair:

=C2=A0

Hi Gyan,

This is more a discussion for the 6MAN WG. Here is t= he charter for the LSR WG: https://datatracker.ietf.org/wg/lsr/about/<= /u>

No need to cross-post to the LSR list=E2=80=A6

Thanks,

Acee

=C2=A0

From: Lsr <lsr-bounces@ietf.org> o= n behalf of Gyan Mishra <hayabusagsm@gmail.com>
Date: Monday, November 30, 2020 at 3:22 PM
To: lsr <lsr@ie= tf.org>
Subject: [Lsr] IPv6 Flow Label QOS marking support for 5-tuple ECMP = / LAG / MLAG hash

=C2=A0

=C2=A0

Dear LSR WG experts,<= /u>

=C2=A0

=C2=A0

Does anyone know if vend= ors have started or plan to start supporting IPv6 flow label 5-tuple dscp m= arking for ECMP hashing. =C2=A0

=C2=A0

IPv6 flow label support = for ECMP

=C2=A0

=C2=A0

IPv4 has traditionally a= lways utilized recommended BCP of flow based load balancing due to issues r= elated to out of order and reordering of packets.=C2=A0 Although per packet= load balancing is supported by most vendors it is not recommended due to forwarding plane impact.

=C2=A0

This IPv6 flow label fea= ture of 5-tuple hash provides significant advantages for operators much nee= ded ECMP load balancing entropy as compare to traditional =E2=80=9Cflow or = session=E2=80=9D based load balancing which is the case as well with MPLS entropy label RFC 6790 load balancing contrasted below.<= u>

=C2=A0

IPv6 flow label has sign= ificant =C2=A0benefits for operators deploying =C2=A0SRv6 which utilizes th= e IPv6 data plane to now have =E2=80=9Cnative=E2=80=9D built in ECMP entrop= y as part of the protocol as compare to its predecessor IPv4. =C2=A0=

=C2=A0

This gives SRv6 another = significant edge over MPLS predecessor.

=C2=A0

Excerpt from RFC 6437:

=C2=A0

=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Forwarding nodes such as routers and =
load distributors MUST NOT
=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0 depend only on Flow Label values being uniformly dist=
ributed.=C2=A0 In
=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0 any usage such as a hash key for load distribution, t=
he Flow Label
=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0 bits MUST be combined at least with bits from other s=
ources within
=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0 the packet, so as to produce a constant hash value fo=
r each flow
=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0 and a suitable distribution of hash values across flo=
ws.
=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0 Typically, the other fields used will be some or all =
components of
=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0 the usual 5-tuple.=C2=A0 In this way, load distributi=
on will still
=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0 occur even if the Flow Label values are poorly distri=
buted.
=C2=
=A0
=C2=A0=C2=
=A0 Although uniformly distributed flow label values are recommended=

=C2=A0=C2=
=A0 below, and will always be helpful for load distribution, it is unsafe
=C2=A0=C2=
=A0 to assume their presence in the general case, and the use case needs=

=C2=A0=C2=
=A0 to work even if the flow label value is zero.

=C2=
=A0


=C2=A0=C2=
=A0 As a general practice, packet flows should not be reordered, and the=



=C2=A0=C2=
=A0 use of the Flow Label field does not affect this.=C2=A0 In particular, =
a


=C2=A0=C2=
=A0 Flow label value of zero does not imply that reordering is


=C2=A0=C2=
=A0 acceptable.


=C2=A0


=C2=A0


Below comparison of IPv6 flow label benefits over MPLS entropy label=
:


=C2=A0


=C2=A0


! MPLS Entropy label 



=C2=
=A0


=C2=A0


=C2=A0


As a comparison to MPLS entropy label, the mpls entropy label reduce=
s the control plane label binding and LFIB forwarding plane data structure =
by not having a per ECMP path label allocation per FEC by adding an additio=
nal entropy label to the label stack.


=C2=A0


=C2=A0


However MPLS entropy label is still uses the traditional flow or ses=
sion based load balancing algorithm which results in <=
/pre>

uneven load balancing.=C2=A0 


=C2=A0


=C2=A0


Kind Regards 


=C2=A0


Gyan


=C2=A0

=C2=A0

--

3D"Image

Gyan Mishra<= /u>

Network Solutions = Architect=C2=A0

M 301 502-1347
13101 Columbia Pike=C2=A0
Silver Spring, MD

=C2=A0



--

Gyan Mishra

Network Solutions A= rchitect=C2= =A0

M 301 502-1347
13101 Columbia= Pike=C2=A0
Silver Spring, MD


<= /div>
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15:39:01 -0800 (PST) MIME-Version: 1.0 References: <6D7A677C-86BC-4A96-8C7B-70B0563631BE@cisco.com> In-Reply-To: From: Gyan Mishra Date: Mon, 30 Nov 2020 18:32:30 -0500 Message-ID: To: "Acee Lindem (acee)" Cc: lsr Content-Type: multipart/alternative; boundary="000000000000d3471405b55b83f1" Archived-At: Subject: Re: [Lsr] IPv6 Flow Label QOS marking support for 5-tuple ECMP / LAG / MLAG hash X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 30 Nov 2020 23:39:05 -0000 --000000000000d3471405b55b83f1 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Understood. I think the gap as you stated as far as ECMP hash algorithm for IPv6 is vendor specific implementation which is independent of LSR. This is a vendor implementation question and not a LSR question. Cheers, Gyan On Mon, Nov 30, 2020 at 4:28 PM Acee Lindem (acee) wrote: > There is nothing in OSPF or IS-IS protocols related to the ECMP > load-balancing with respect to the flow label. RFC 6437 is an IPv6 WG > (predecessor of 6MAN) document. Are you just trying to torment me =F0=9F= =98=89 > > > > Acee > > > > *From: *Gyan Mishra > *Date: *Monday, November 30, 2020 at 4:23 PM > *To: *Acee Lindem > *Cc: *lsr > *Subject: *Re: [Lsr] IPv6 Flow Label QOS marking support for 5-tuple ECMP > / LAG / MLAG hash > > > > Hi Acee > > > > 6MAN deals with the IPv6 protocol specifications and not routing protocol= s > in the ECMP load balancing framework. > > > > 6MAN would not have any idea if ISIS or OSPF AFI IPv6 5-tuple ECMP load > balancing is supported and industry direction to support this critical > feature from a IGP perspective. > > > > This question posed is in the context of LSR IGP load balancing framework= , > OSPF & ISIS AFI IPv6 use of RFC 6437 for 5-tuple hash ECMP load balancin= g > for even 50/50 load balancing hash as opposed to router default flow or > session based load balancing. > > > > Any feedback related in this context is much appreciated. > > > > Kind Regards > > > > Gyan > > > > On Mon, Nov 30, 2020 at 3:39 PM Acee Lindem (acee) wrote= : > > Speaking as LSR Co-Chair: > > > > Hi Gyan, > > This is more a discussion for the 6MAN WG. Here is the charter for the LS= R > WG: https://datatracker.ietf.org/wg/lsr/about/ > > No need to cross-post to the LSR list=E2=80=A6 > > Thanks, > > Acee > > > > *From: *Lsr on behalf of Gyan Mishra < > hayabusagsm@gmail.com> > *Date: *Monday, November 30, 2020 at 3:22 PM > *To: *lsr > *Subject: *[Lsr] IPv6 Flow Label QOS marking support for 5-tuple ECMP / > LAG / MLAG hash > > > > > > Dear LSR WG experts, > > > > > > Does anyone know if vendors have started or plan to start supporting IPv6 > flow label 5-tuple dscp marking for ECMP hashing. > > > > IPv6 flow label support for ECMP > > > > https://tools.ietf.org/html/rfc6437 > > > > IPv4 has traditionally always utilized recommended BCP of flow based load > balancing due to issues related to out of order and reordering of packets= . > Although per packet load balancing is supported by most vendors it is not > recommended due to forwarding plane impact. > > > > This IPv6 flow label feature of 5-tuple hash provides significant > advantages for operators much needed ECMP load balancing entropy as compa= re > to traditional =E2=80=9Cflow or session=E2=80=9D based load balancing whi= ch is the case as > well with MPLS entropy label RFC 6790 load balancing contrasted below. > > > > IPv6 flow label has significant benefits for operators deploying SRv6 > which utilizes the IPv6 data plane to now have =E2=80=9Cnative=E2=80=9D b= uilt in ECMP > entropy as part of the protocol as compare to its predecessor IPv4. > > > > This gives SRv6 another significant edge over MPLS predecessor. > > > > Excerpt from RFC 6437: > > > > Forwarding nodes such as routers and load distributors MUST NOT > > depend only on Flow Label values being uniformly distributed. In > > any usage such as a hash key for load distribution, the Flow Label > > bits MUST be combined at least with bits from other sources within > > the packet, so as to produce a constant hash value for each flow > > and a suitable distribution of hash values across flows. > > Typically, the other fields used will be some or all components of > > the usual 5-tuple. In this way, load distribution will still > > occur even if the Flow Label values are poorly distributed. > > > > Although uniformly distributed flow label values are recommended > > below, and will always be helpful for load distribution, it is unsafe > > to assume their presence in the general case, and the use case needs > > to work even if the flow label value is zero. > > > > As a general practice, packet flows should not be reordered, and the > > use of the Flow Label field does not affect this. In particular, a > > Flow label value of zero does not imply that reordering is > > acceptable. > > > > > > Below comparison of IPv6 flow label benefits over MPLS entropy label: > > > > > > ! MPLS Entropy label > > https://tools.ietf.org/html/rfc6790 > > > > > > > > As a comparison to MPLS entropy label, the mpls entropy label reduces the= control plane label binding and LFIB forwarding plane data structure by no= t having a per ECMP path label allocation per FEC by adding an additional e= ntropy label to the label stack. > > > > > > However MPLS entropy label is still uses the traditional flow or session = based load balancing algorithm which results in > > uneven load balancing. > > > > > > Kind Regards > > > > Gyan > > > > > > -- > > *Error! Filename not specified.* > > *Gyan Mishra* > > *Network Solutions Architect * > > > > *M 301 502-1347 13101 Columbia Pike *Silver Spring, MD > > > > > > > -- > > [image: Image removed by sender.] > > *Gyan Mishra* > > *Network Solutions Architect * > > > > *M 301 502-1347 13101 Columbia Pike *Silver Spring, MD > > > --=20 *Gyan Mishra* *Network Solutions A**rchitect * *M 301 502-134713101 Columbia Pike *Silver Spring, MD --000000000000d3471405b55b83f1 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Understood.=C2=A0 I think the gap as you stated as far as = ECMP hash algorithm for IPv6 is vendor=C2=A0specific implementation which i= s independent of LSR.=C2=A0 This is a vendor implementation question and no= t a LSR question.

Cheers,

Gyan<= /div>

On Mon, Nov 30, 2020 at 4:28 PM Acee Lindem (acee) <acee@cisco.com> wrote:

There is nothing in OSPF or IS-IS protocols related = to the ECMP load-balancing with respect to the flow label. RFC 6437 is an I= Pv6 WG (predecessor of 6MAN) document. Are you just trying to torment me =F0=9F=98=89

=C2=A0

Acee

=C2=A0

From: Gyan Mishra <hayabusagsm@gmail.com= >
Date: Monday, November 30, 2020 at 4:23 PM
To: Acee Lindem <acee@cisco.com>
Cc: lsr <lsr@ie= tf.org>
Subject: Re: [Lsr] IPv6 Flow Label QOS marking support for 5-tuple E= CMP / LAG / MLAG hash

=C2=A0

Hi Acee

=C2=A0

6MAN deals with the IPv6= protocol specifications and not routing protocols in the ECMP load balanci= ng framework.=C2=A0=C2=A0

=C2=A0

6MAN would not have any = idea if ISIS or OSPF AFI IPv6 5-tuple ECMP load balancing is supported and = industry direction to support this critical feature from a IGP perspective.= =C2=A0

=C2=A0

This question posed is i= n the context of LSR IGP load balancing framework, OSPF & ISIS=C2=A0 AF= I IPv6 use of RFC 6437 for 5-tuple hash ECMP load balancing for even 50/50 = load balancing hash as opposed to router default flow or session based load balancing.

=C2=A0

Any feedback related in = this context is=C2=A0 much appreciated.=C2=A0

=C2=A0

Kind Regards

=C2=A0

Gyan

=C2=A0

On Mon, Nov 30, 2020 at = 3:39 PM Acee Lindem (acee) <acee@cisco.com> wrote:

Speaking as LSR Co-Chair:

=C2=A0

Hi Gyan,

This is more a discussion for the 6MAN WG. Here is the charter for the LSR = WG: https://datatracker.ietf.org/wg/lsr/about/

No need to cross-post to the LSR list=E2=80=A6

Thanks,

Acee

=C2=A0

From: Lsr <lsr-bounces@ietf.org> on behalf of Gyan Mishr= a <hayabusags= m@gmail.com>
Date: Monday, November 30, 2020 at 3:22 PM
To: lsr <lsr@ie= tf.org>
Subject: [Lsr] IPv6 Flow Label QOS marking support for 5-tuple ECMP = / LAG / MLAG hash

=C2=A0

=C2=A0

Dear LSR WG experts,

=C2=A0

=C2=A0

Does anyone know if vendors have started or plan to start supporting IPv6 f= low label 5-tuple dscp marking for ECMP hashing. =C2=A0

=C2=A0

IPv6 flow label support for ECMP

=C2=A0

=C2=A0

IPv4 has traditionally always utilized recommended BCP of flow based load b= alancing due to issues related to out of order and reordering of packets.= =C2=A0 Although per packet load balancing is supported by most vendors it i= s not recommended due to forwarding plane impact.

=C2=A0

This IPv6 flow label feature of 5-tuple hash provides significant advantage= s for operators much needed ECMP load balancing entropy as compare to tradi= tional =E2=80=9Cflow or session=E2=80=9D based load balancing which is the = case as well with MPLS entropy label RFC 6790 load balancing contrasted below.

=C2=A0

IPv6 flow label has significant =C2=A0benefits for operators deploying =C2= =A0SRv6 which utilizes the IPv6 data plane to now have =E2=80=9Cnative=E2= =80=9D built in ECMP entropy as part of the protocol as compare to its pred= ecessor IPv4. =C2=A0

=C2=A0

This gives SRv6 another significant edge over MPLS predecessor.

=C2=A0

Excerpt from RFC 6437:

=C2=A0

=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Forwarding nodes such as routers and lo=
ad distributors MUST NOT
=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0 depend only on Flow Label values being uniformly distrib=
uted.=C2=A0 In
=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0 any usage such as a hash key for load distribution, the =
Flow Label
=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0 bits MUST be combined at least with bits from other sour=
ces within
=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0 the packet, so as to produce a constant hash value for e=
ach flow
=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0 and a suitable distribution of hash values across flows.=

=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0 Typically, the other fields used will be some or all com=
ponents of
=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0 the usual 5-tuple.=C2=A0 In this way, load distribution =
will still
=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0 occur even if the Flow Label values are poorly distribut=
ed.
=C2=A0=

=C2=A0=C2=A0 =
Although uniformly distributed flow label values are recommended<=
/u>
=C2=A0=C2=A0 =
below, and will always be helpful for load distribution, it is unsafe
=C2=A0=C2=A0 =
to assume their presence in the general case, and the use case needs=

=C2=A0=C2=A0 =
to work even if the flow label value is zero.
=C2=A0=

=C2=A0=C2=A0 =
As a general practice, packet flows should not be reordered, and the=

=C2=A0=C2=A0 =
use of the Flow Label field does not affect this.=C2=A0 In particular, a
=C2=A0=C2=A0 =
Flow label value of zero does not imply that reordering is=

=C2=A0=C2=A0 =
acceptable.
=C2=A0
=C2=A0
Below comparison of IPv6 flow label benefits over MPLS entropy label:<=
/span>
=C2=A0
=C2=A0
! MPLS Entropy label 
=C2=A0=

=C2=A0
=C2=A0
As a comparison to MPLS entropy label, the mpls entropy label reduces =
the control plane label binding and LFIB forwarding plane data structure by=
 not having a per ECMP path label allocation per FEC by adding an additiona=
l entropy label to the label stack.
=C2=A0
=C2=A0
However MPLS entropy label is still uses the traditional flow or sessi=
on based load balancing algorithm which results in 

uneven load balancing.=C2=A0 


=C2=A0


=C2=A0


Kind Regards 


=C2=A0


Gyan


=C2=A0

=C2=A0

--

Error= ! Filename not specified.

Gyan Mishra

Network Solutions = Architect=C2=A0

M 301 502-1347
13101 Columbia Pike=C2=A0
Silver Spring, MD

=C2=A0


=C2=A0

--

3D"Image

Gyan Mishra<= /u>

Network Solutions = Architect=C2=A0

M 301 502-1347
13101 Columbia Pike=C2=A0
Silver Spring, MD

=C2=A0



--

Gyan Mishra

Network Solutions A= rchitect=C2= =A0

M 301 502-1347
13101 Columbia= Pike=C2=A0
Silver Spring, MD


<= /div>
--000000000000d3471405b55b83f1-- From nobody Mon Nov 30 19:52:02 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1BC623A08A5 for ; Mon, 30 Nov 2020 19:52:00 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.918 X-Spam-Level: X-Spam-Status: No, score=-1.918 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=unavailable autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id cD50_vwKs4DM for ; Mon, 30 Nov 2020 19:51:56 -0800 (PST) Received: from mail-m127101.qiye.163.com (mail-m127101.qiye.163.com [115.236.127.101]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 853423A0876 for ; Mon, 30 Nov 2020 19:51:55 -0800 (PST) Received: from DESKTOP2IOH5QC (unknown [219.142.69.75]) by mail-m127101.qiye.163.com (Hmail) with ESMTPA id 41DB746C69; Tue, 1 Dec 2020 11:51:48 +0800 (CST) From: "Aijun Wang" To: "'Acee Lindem \(acee\)'" , "'Alexander Okonnikov'" , "'Van De Velde, Gunter \(Nokia - BE/Antwerp\)'" Cc: , "'Peter Psenak \(ppsenak\)'" References: <61201EB5-3F36-401A-9D39-FB0C577C7966@gmail.com> <3d3d863b-3e1f-ea87-0c45-09e119aa7c8f@cisco.com> <3FE4F6F8-6819-425E-852F-6B5B968ECAF5@gmail.com> <57b88873-b0e9-c2d3-2732-7f2629eebf27@cisco.com> <5D89BE28-934A-4EE3-915A-456AAD7AC59C@gmail.com> <10D19997-F6CA-45A2-A5C3-C14C8FD41069@cisco.com> In-Reply-To: <10D19997-F6CA-45A2-A5C3-C14C8FD41069@cisco.com> Date: Tue, 1 Dec 2020 11:51:47 +0800 Message-ID: <00d801d6c795$4b7d3680$e277a380$@tsinghua.org.cn> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00D9_01D6C7D8.59A3AAD0" X-Mailer: Microsoft Outlook 16.0 Thread-Index: AQJPZKx16EHlYEQ6dUFarTaMgdWqZQGxe/opAbfkCk8B44MDiwJMTvyjAc962aoBv+e1QgIO0I5NAVK5zVmofAq4sA== Content-Language: zh-cn X-HM-Spam-Status: e1kfGhgUHx5ZQUtXWQgYFAkeWUFZS1VLWVdZKFlBSkxLS0o3V1ktWUFJV1 kPCRoVCBIfWUFZSx9PQk1IGk4YGEtIVkpNS01MQk9MS0NOTUJVEwETFhoSFyQUDg9ZV1kWGg8SFR 0UWUFZT0tIVUpKS09ISFVLWQY+ X-HM-Sender-Digest: e1kMHhlZQR0aFwgeV1kSHx4VD1lBWUc6Pxg6HBw4FD8oQkM1OTAOCAMI HB8wCilVSlVKTUtNTEJPTEtCS0hOVTMWGhIXVQwaFRwaEhEOFTsPCBIVHBMOGlUUCRxVGBVFWVdZ EgtZQVlJSkJVSk9JVU1CVUxOWVdZCAFZQU1KTkhONwY+ X-HM-Tid: 0a761c6d85d39865kuuu41db746c69 Archived-At: Subject: Re: [Lsr] Link Data value for Multi-area links X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 01 Dec 2020 03:52:00 -0000 This is a multipart message in MIME format. ------=_NextPart_000_00D9_01D6C7D8.59A3AAD0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi,=20 =20 How about using the stub-link that we proposed and discussed at = https://mailarchive.ietf.org/arch/msg/lsr/LppwUNb_ngr8m4awaprvSHGFfhg/ = to solve the scenario that described in RFC5185? The possible solution is the following: 1) The ABR form only the normal adjacency within the backbone area. 2) For other area(for example, area 1) that they belong, each of = them advertise the stub-link TLV, which include the network prefix that = other area(area 1) belongs to, and also the metric to such prefix. 3) The OSPF treat the prefixes within this stub-link TLV as the = intra-area prefix in other area(area 1) and will prefer to using them = over the inter-area prefix in the non-multi-area solution. 4) More areas can be configured on such ABRs, eliminate the = necessary to configure interface address within each area, also = eliminate the ambiguity for using the remote peer address to = differentiate the different adjacency. 5) It is also easy to correlate such link information with the TE = information that advertised in RFC3630. Are the above proposal acceptable? =20 Best Regards =20 Aijun Wang China Telecom =20 From: lsr-bounces@ietf.org On Behalf Of Acee = Lindem (acee) Sent: Tuesday, December 1, 2020 1:58 AM To: Alexander Okonnikov ; Van De Velde, = Gunter (Nokia - BE/Antwerp) Cc: lsr@ietf.org; Peter Psenak (ppsenak) Subject: Re: [Lsr] Link Data value for Multi-area links =20 Speaking on WG member: =20 Hi Alex,=20 I knew this was coming. In 2008, 99.9% of the requirements were handled = by supporting an interface in a primary area and one other area. Using = the remote IP address for the other area does handle this case. As I = stated previously, if you support OSPF adjacencies on secondary IP = addresses, the MIB and other complexities are all taken care of and that = would be the solution that I would recommend. However, if you guys want = to spend time trying to improve RFC5185, you are perfectly welcome to = submit a draft.=20 =20 Thanks, Acee =20 From: Alexander Okonnikov > Date: Monday, November 30, 2020 at 12:47 PM To: Gunter Van de Velde > Cc: Acee Lindem >, "Peter Psenak = (ppsenak)" >, = "lsr@ietf.org " > Subject: Re: [Lsr] Link Data value for Multi-area links =20 Hi Acee, =20 RFC 5185 says that interface data structure is created for each = multi-area adjacency. I guess that we are not allowed to allocate = several ifIndex values for the same IP interface, because it is property = of router's interface, not OSPF interface. Hence, we have several OSPF = interfaces with the same ifIndex in unnumbered case and, thus, ambiguity = in Interface table. The same for numbered - we have IP interface address = (one), which is the same for multiple OSPF interfaces, and we again = obtain ambiguity. Per my understanding advertising neighbor's IP address = (or ifIndex) in Link Data doesn't help here. =20 30 =D0=BD=D0=BE=D1=8F=D0=B1. 2020 =D0=B3., =D0=B2 20:20, Van De Velde, = Gunter (Nokia - BE/Antwerp) > = =D0=BD=D0=B0=D0=BF=D0=B8=D1=81=D0=B0=D0=BB(=D0=B0): =20 The oddnes is that the architecture decision in RFC5185 to select = remote-ip-address instead of local-ip-address for the =E2=80=98Link = Data=E2=80=99 is making things much more complicated. I am surprised to see that using the remote-ip-address is seen as the = =E2=80=98better=E2=80=99 choice as selecting local-ip-address. To me it = seems as a worse choice. =20 A question that was asked: How router will be able to match Link TLV = (RFC 3630) to corresponding Link in Router LSA? =20 Answer: For unnumbered links we can match Link TLV with Router TLV using the = IfIndex when there is no stub type 3 link (=3Deasy) For numbered: 1. we must first look if the there is a stub type 3 link 2. If stub type 3 exists, then the RFC3630 local ip address must = be used to identify the correspond link within the router TLV to the = neighbor 3. If the stub type 3 link did not exist in Router TLV link, then = the maybe the link is unnumbered, and we try to match upon = IfIndex=E2=80=A6 This may give a match or no match 4. If there is no match, then maybe the link is MADJ and we must = use the RFC3630 remote IP address to match upon the Link Data 5. =3D over-complex. (If we used for RFC5185 =E2=80=98Link Data = =3D local ip address=E2=80=99 then (2) would given answer directly) =20 In addition, for a router it is much simpler to learn and advertise = local-ip-address in Router LSAs then using a remote-ip-address. I also believe that if we want to search something in TEDB after = receiving a TE Link TLV. How can we identify from the TE Link TLV if = multi-area or not multi-area? If we can not, then how can we create the = correct key? =20 Looking at the above, the choice of using remote-ip-address for RFC5185 = Link Data seems not the best design that we can do, and is adding OSPF = complexity without benefits. =20 Should this not be corrected in RFC5185 and simply use local-ip-address = instead of the remote-ip-address for Multi-area Link Data and avoid the = additional unnecessary complexity the current RFC for numbered links? =20 Brgds, G/ =20 =20 From: Lsr > On = Behalf Of Acee Lindem (acee) Sent: Monday, November 30, 2020 18:01 To: Alexander Okonnikov >; Peter Psenak (ppsenak) = > Cc: lsr@ietf.org =20 Subject: Re: [Lsr] Link Data value for Multi-area links =20 Hi Alex,=20 =20 Multi-Area interface disambiguation is required to support the OSPF MIB = as specified in RFC 4750. The table indexing doesn=E2=80=99t include the = area. For example: =20 -- OSPF Interface Table =20 ospfIfTable OBJECT-TYPE SYNTAX SEQUENCE OF OspfIfEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "The OSPF Interface Table describes the interfaces from the viewpoint of OSPF. It augments the ipAddrTable with OSPF specific information." REFERENCE "OSPF Version 2, Appendix C.3 Router interface parameters" ::=3D { ospf 7 } =20 ospfIfEntry OBJECT-TYPE SYNTAX OspfIfEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "The OSPF interface entry describes one interface from the viewpoint of OSPF. =20 Information in this table is persistent and when this object is written the entity SHOULD save the change to non-volatile storage." INDEX { ospfIfIpAddress, ospfAddressLessIf } ::=3D { ospfIfTable 1 } =20 Note that if you really want to support this optimally, you could use a = separate subnet pre-area and have adjacencies on secondary addresses. My = Redback/Ericsson implementation allowed for this. =20 =20 Thanks, Acee =20 =20 From: Lsr > on = behalf of Alexander Okonnikov > Date: Monday, November 30, 2020 at 5:27 AM To: "Peter Psenak (ppsenak)" > Cc: "lsr@ietf.org " > Subject: Re: [Lsr] Link Data value for Multi-area links =20 Hi Peter, =20 30 =D0=BD=D0=BE=D1=8F=D0=B1. 2020 =D0=B3., =D0=B2 12:56, Peter Psenak = > = =D0=BD=D0=B0=D0=BF=D0=B8=D1=81=D0=B0=D0=BB(=D0=B0): =20 Hi Alex, On 27/11/2020 13:49, Alexander Okonnikov wrote: Hi Peter, Which kind of ambiguity is meant? In case of numbered point-to-point = each link has its own unique IP address, so there is no ambiguity. Per my understanding this problem has appeared due to follow reasons: 1) In old versions of the draft (up to -05) it was proposed that = multi-area links are treated as unnumbered. ifIndex to be encoded in = Link Data field, irrespectively whether interface has its own IP address = (numbered) or borrow it (unnumbered); 2) From -06 to -08 multi-area links are still treated as unnumbered, but = if interface is numbered, then IP address of the neighbor (rather than = local one) to be encoded into Link Data, in order to make the link look = like unnumbered; 3) In version -09 of the draft and in RFC 5185 itself there is no more = mentions that multi-area link to be treated as unnumbered. Rather, = another approach is used - if router's interface is numbered, then link = is also numbered; if router's interface is unnumbered, then link is = unnumbered. The rule that specifies omitting corresponding type 3 link = is added. Mention of 'unnumbered' link is also removed from section 3 in = RFC 5185. > Hence, in version -09 with removing unnumbered nature of multi-area = links Link Data for numbered links had to be changed from Neighbor's IP = address to own IP address, as it is specified in RFC 2328. From = perspective of other routers this link can be treated as numbered or = unnumbered, depending on configuration of neighbor's corresponding = interface. you are free to advertise the link as unnumbered. RFC5185 is not = mandating to send IP address really. =20 The same valid for numbered ones. I.e. I'm free to advertise the link as = numbered. This is straightforward when the link is numbered indeed. And = if we would prefer to have deal with unnumbered interfaces, we would not = need RFC 5185 (section 1.2). =20 One question - how neighboring router will perform next-hop calculation = (in case it needs to do so)? If neighbor is configured with numbered = interface, it will treat Link Data as IP next hop, which will be its own = IP interface address. Another question - how router will be able to match Link TLV (RFC 3630) = to corresponding Link in Router LSA? For example, we want to calculate = RSVP-TE LSP based on IGP metric (RFC 3785) and thus router needs to = match IGP link to TE link. I don't believe you are going to do any traffic engineering over a = multi-area adjacency. MADJ is there to address the OSPF route preference = rules that may lead to sub-optimal routing. MADJ link is not advertised = for TE purposes. =20 Why not? We need multi-area configuration and at the same time we need = ability to build intra-area RSVP-TE LSPs within each of areas. And what = about calculating IP next hop? Which compatibility is meant in section = 3? =20 thanks, Peter =20 Thank you. =20 Thank you. 27 =D0=BD=D0=BE=D1=8F=D0=B1. 2020 =D0=B3., =D0=B2 14:50, Peter Psenak = > = =D0=BD=D0=B0=D0=BF=D0=B8=D1=81=D0=B0=D0=BB(=D0=B0): Alexander, On 26/11/2020 17:58, Alexander Okonnikov wrote: Hi WG, RFC 5185 says that Neighbor's IP address to be encoded into Link Data = field. Per RFC 2328 router's own IP address to be encoded into Link = Data. What is the reason to advertise neighbor's IP address for = multi-area links and not local IP address? It seems like bug. Could = someone comment on this? Advertising a neighbor address/ifindex helps to eliminate ambiguity in = case of parallel point-to-point adjacencies. It's not perfect, but = that's how it was specified. So it's not a bug. thanks, Peter Thanks in advance. _______________________________________________ Lsr mailing list Lsr@ietf.org =20 https://www.ietf.org/mailman/listinfo/lsr =20 ------=_NextPart_000_00D9_01D6C7D8.59A3AAD0 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

H= i,

<= o:p> 

H= ow about using the stub-link that we proposed and discussed at https://mailarchive.ietf.org/arch/msg/lsr/LppwUNb_ngr8m4awaprvSHGF= fhg/ to solve the scenario that described in = RFC5185?

T= he possible solution is the following:

<= span style=3D'mso-list:Ignore'>1)     T= he ABR form only the normal adjacency within the backbone = area.

<= span style=3D'mso-list:Ignore'>2)     F= or other area(for example, area 1) that they belong, each of them = advertise the stub-link TLV, which include the network prefix that other = area(area 1) belongs to, and also the metric to such = prefix.

<= span style=3D'mso-list:Ignore'>3)     T= he OSPF treat the prefixes within this stub-link TLV as the intra-area = prefix in other area(area 1) and will prefer to using them over the = inter-area prefix in the non-multi-area = solution.

<= span style=3D'mso-list:Ignore'>4)     M= ore areas can be configured on such ABRs, eliminate the necessary to = configure interface address within each area, also eliminate the = ambiguity for using the remote peer address to differentiate the = different adjacency.

<= span style=3D'mso-list:Ignore'>5)     I= t is also easy to correlate such link information with the TE = information that advertised in RFC3630.

A= re the above proposal acceptable?

<= o:p> 

B= est Regards

<= o:p> 

A= ijun Wang

C= hina Telecom<= o:p>

<= o:p> 

From: lsr-bounces@ietf.org = <lsr-bounces@ietf.org> On Behalf Of Acee Lindem = (acee)
Sent: Tuesday, December 1, 2020 1:58 AM
To: = Alexander Okonnikov <alexander.okonnikov@gmail.com>; Van De Velde, = Gunter (Nokia - BE/Antwerp) = <gunter.van_de_velde@nokia.com>
Cc: lsr@ietf.org; Peter = Psenak (ppsenak) <ppsenak@cisco.com>
Subject: Re: [Lsr] = Link Data value for Multi-area links

 

Speaking on WG member:

 

Hi Alex,

I knew this was coming. In 2008, 99.9% of the requirements = were handled by supporting an interface in a primary area and one other = area. Using the remote IP address for the other area does handle this = case. As I stated previously, if you support OSPF adjacencies on = secondary IP addresses, the MIB and other complexities are all taken = care of and that would be the solution that I would recommend. However, = if you guys want to spend time trying to improve RFC5185, you are = perfectly welcome to submit a draft.

 

Thanks,

Acee

 

From: = Alexander Okonnikov <alexander.okonnikov@gmail.c= om>
Date: Monday, November 30, 2020 at 12:47 = PM
To: Gunter Van de Velde <gunter.van_de_velde@nokia.c= om>
Cc: Acee Lindem <acee@cisco.com>, "Peter = Psenak (ppsenak)" <ppsenak@cisco.com>, "lsr@ietf.org" <lsr@ietf.org>
Subject: Re: = [Lsr] Link Data value for Multi-area = links

 

Hi Acee,

 

RFC 5185 says that interface data structure is created for = each multi-area adjacency. I guess that we are not allowed to allocate = several ifIndex values for the same IP interface, because it is property = of router's interface, not OSPF interface. Hence, we have several OSPF = interfaces with the same ifIndex in unnumbered case and, thus, ambiguity = in Interface table. The same for numbered - we have IP interface address = (one), which is the same for multiple OSPF interfaces, and we again = obtain ambiguity. Per my understanding advertising neighbor's IP address = (or ifIndex) in Link Data doesn't help = here.

 

30 =D0=BD=D0=BE=D1=8F=D0=B1. 2020 =D0=B3., =D0=B2 20:20, = Van De Velde, Gunter (Nokia - BE/Antwerp) <gunter.van_de_velde@nokia.c= om> = =D0=BD=D0=B0=D0=BF=D0=B8=D1=81=D0=B0=D0=BB(=D0=B0):

=

 

The oddnes is that the architecture decision in RFC5185 to = select remote-ip-address instead of local-ip-address for the = =E2=80=98Link Data=E2=80=99 is making things much more = complicated.

I am surprised to see that using the remote-ip-address is = seen as the =E2=80=98better=E2=80=99 choice as selecting = local-ip-address. To me it seems as a worse = choice.

 

A question that was asked: How router will be able to match = Link TLV (RFC 3630) to corresponding Link in Router = LSA?

 

Answer:

For unnumbered links we can match Link TLV with Router TLV = using the IfIndex when there is no stub type 3 link = (=3Deasy)

For numbered:

1.       = we must first look if = the there is a stub type 3 link

2.       = If stub type 3 exists, = then the RFC3630 local ip address must be used to identify the = correspond link within the router TLV to the = neighbor

3.       = If the stub type 3 = link did not exist in Router TLV link, then the maybe the link is = unnumbered, and we try to match upon IfIndex=E2=80=A6 This may give a = match or no match

4.       = If there is no match, = then maybe the link is MADJ and we must use the RFC3630 remote IP = address to match upon the Link Data

5.       = =3D over-complex. (If = we used  for RFC5185 =E2=80=98Link Data =3D local ip = address=E2=80=99 then (2) would given answer = directly)

 

In addition, for a router it is much simpler to learn and = advertise local-ip-address in Router LSAs then using a = remote-ip-address.

I also believe that if we want to search something in TEDB = after receiving a TE Link TLV. How can we identify from the TE Link TLV = if multi-area or not multi-area? If we can not, then how can we create = the correct key?

 

Looking at the above, the choice of using remote-ip-address = for RFC5185 Link Data seems not the best design that we can do, and is = adding OSPF complexity without = benefits.

 

Should this not be corrected in RFC5185 and simply use = local-ip-address instead of the remote-ip-address for Multi-area Link = Data and avoid the additional unnecessary complexity the current RFC for = numbered links?

 

Brgds,

G/

 

 

From: Lsr <lsr-bounces@ietf.org> On Behalf Of Acee Lindem = (acee)
Sent: Monday, November 30, 2020 = 18:01
To: Alexander Okonnikov <alexander.okonnikov@gmail.c= om>; Peter Psenak (ppsenak) <ppsenak@cisco.com>
Cc:=  lsr@ietf.org
Subject: Re: [Lsr] Link Data value for = Multi-area links

 

Hi Alex, 

 

Multi-Area interface disambiguation is required to support = the OSPF MIB as specified in RFC 4750. The table indexing = doesn=E2=80=99t include the area. For = example:

 

--  OSPF Interface = Table

 

  ospfIfTable = OBJECT-TYPE

       = SYNTAX       SEQUENCE OF = OspfIfEntry

       MAX-ACCESS   = not-accessible

       = STATUS       = current

       = DESCRIPTION

          = "The OSPF Interface Table describes the = interfaces

          from = the viewpoint of OSPF.

          It = augments the ipAddrTable with OSPF specific = information."

       = REFERENCE

          = "OSPF Version 2, Appendix C.3  Router = interface

          = parameters"

       ::=3D { ospf 7 = }

 

  ospfIfEntry = OBJECT-TYPE

       = SYNTAX       = OspfIfEntry

       MAX-ACCESS   = not-accessible

       = STATUS       = current

       = DESCRIPTION

          = "The OSPF interface entry describes one = interface

          from = the viewpoint of OSPF.

 

          = Information in this table is persistent and when this = object

          is = written the entity SHOULD save the change to = non-volatile

          = storage."

       INDEX { ospfIfIpAddress, ospfAddressLessIf = }

       ::=3D { ospfIfTable 1 = }

 

Note that if you really want to support this optimally, you = could use a separate subnet pre-area and have adjacencies on secondary = addresses. My Redback/Ericsson implementation allowed for this. =   

 

Thanks,

Acee

 

 

From: Lsr <lsr-bounces@ietf.org> on = behalf of Alexander Okonnikov <alexander.okonnikov@gmail.c= om>
Date: Monday, November 30, 2020 = at 5:27 AM
To: "Peter Psenak = (ppsenak)" <ppsenak@cisco.com>
Cc: "lsr@ietf.org" <lsr@ietf.org>
Subject: Re: [Lsr] Link Data value = for Multi-area links

 

Hi Peter,

 

30 =D0=BD=D0=BE=D1=8F=D0=B1. 2020 =D0=B3., =D0=B2 12:56, = Peter Psenak <ppsenak@cisco.com> = =D0=BD=D0=B0=D0=BF=D0=B8=D1=81=D0=B0=D0=BB(=D0=B0):

=

 

Hi = Alex,

On 27/11/2020 13:49, Alexander Okonnikov wrote:

Hi = Peter,
Which kind of ambiguity is meant? In case of numbered = point-to-point each link has its own unique IP address, so there is no = ambiguity.
Per my understanding this problem has appeared due to = follow reasons:
1) In old versions of the draft (up to -05) it was = proposed that multi-area links are treated as unnumbered. ifIndex to be = encoded in Link Data field, irrespectively whether interface has its own = IP address (numbered) or borrow it (unnumbered);
2) From -06 to -08 = multi-area links are still treated as unnumbered, but if interface is = numbered, then IP address of the neighbor (rather than local one) to be = encoded into Link Data, in order to make the link look like = unnumbered;
3) In version -09 of the draft and in RFC 5185 itself = there is no more mentions that multi-area link to be treated as = unnumbered. Rather, another approach is used - if router's interface is = numbered, then link is also numbered; if router's interface is = unnumbered, then link is unnumbered. The rule that specifies omitting = corresponding type 3 link is added. Mention of 'unnumbered' link is also = removed from section 3 in RFC 5185. >
Hence, in version -09 with = removing unnumbered nature of multi-area links Link Data for numbered = links had to be changed from Neighbor's IP address to own IP address, as = it is specified in RFC 2328. From perspective of other routers this link = can be treated as numbered or unnumbered, depending on configuration of = neighbor's corresponding interface.


you are = free to advertise the link as unnumbered. RFC5185 is not mandating to = send IP address really.

 

The same valid for numbered ones. I.e. I'm free to = advertise the link as numbered. This is straightforward when the link is = numbered indeed. And if we would prefer to have deal with unnumbered = interfaces, we would not need RFC 5185 (section = 1.2).

 

One question = - how neighboring router will perform next-hop calculation (in case it = needs to do so)? If neighbor is configured with numbered interface, it = will treat Link Data as IP next hop, which will be its own IP interface = address.
Another question - how router will be able to match Link TLV = (RFC 3630) to corresponding Link in Router LSA? For example, we want to = calculate RSVP-TE LSP based on IGP metric (RFC 3785) and thus router = needs to match IGP link to TE link.


I don't = believe you are going to do any traffic engineering over a multi-area = adjacency. MADJ is there to address the OSPF route preference rules that = may lead to sub-optimal routing. MADJ link is not advertised for TE = purposes.

 

Why not? We need multi-area configuration and at the same = time we need ability to build intra-area RSVP-TE LSPs within each of = areas. And what about calculating IP next hop? Which compatibility is = meant in section 3?

 

thanks,
Pe= ter

 

Thank you.

 

Thank = you.

27 = =D0=BD=D0=BE=D1=8F=D0=B1. 2020 =D0=B3., =D0=B2 14:50, Peter Psenak = <ppsenak@cisco.com> = =D0=BD=D0=B0=D0=BF=D0=B8=D1=81=D0=B0=D0=BB(=D0=B0):

Alexander,
=
On 26/11/2020 17:58, Alexander Okonnikov wrote:

Hi = WG,
RFC 5185 says that Neighbor's IP address to be encoded into Link = Data field. Per RFC 2328 router's own IP address to be encoded into Link = Data. What is the reason to advertise neighbor's IP address for = multi-area links and not local IP address? It seems like bug. Could = someone comment on this?


Advertisi= ng a neighbor address/ifindex helps to eliminate ambiguity in case of = parallel point-to-point adjacencies. It's not perfect, but that's how it = was specified. So it's not a = bug.

thanks,
Peter

Thanks in = advance.
_______________________________________________
Lsr = mailing list
Lsr@ietf.org
https://www.ietf.org/m= ailman/listinfo/lsr

 

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