
From nobody Sun Jul  1 02:08:41 2018
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Subject: [Lsr] I-D Action: draft-ietf-ospf-lls-interface-id-04.txt
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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           : OSPF LLS Extensions for Local Interface ID Advertisement
        Authors         : Peter Psenak
                          Ketan Jivan Talaulikar
                          Wim Henderickx
                          Padma Pillay-Esnault
	Filename        : draft-ietf-ospf-lls-interface-id-04.txt
	Pages           : 6
	Date            : 2018-07-01

Abstract:
   Every OSPF interface is assigned an identifier, Interface ID, which
   uniquely identifies the interface on the router.  In some cases it is
   useful to know the Interface ID assigned by the adjacent router on
   its side of the adjacency (Remote Interface ID).

   This draft describes the extensions to OSPF link-local signalling to
   advertise the Local Interface Identifier.



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-ospf-lls-interface-id/

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https://www.ietf.org/rfcdiff?url2=draft-ietf-ospf-lls-interface-id-04


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From nobody Sun Jul  1 15:54:27 2018
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Subject: [Lsr] I-D Action: draft-ietf-ospf-sr-yang-05.txt
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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           : Yang Data Model for OSPF SR (Segment Routing) Protocol
        Authors         : Derek Yeung
                          Yingzhen Qu
                          Jeffrey Zhang
                          Ing-Wher Chen
                          Acee Lindem
	Filename        : draft-ietf-ospf-sr-yang-05.txt
	Pages           : 24
	Date            : 2018-07-01

Abstract:
   This document defines a YANG data model that can be used to configure
   and manage OSPF Segment Routing.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-ospf-sr-yang/

There are also htmlized versions available at:
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https://datatracker.ietf.org/doc/html/draft-ietf-ospf-sr-yang-05

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https://www.ietf.org/rfcdiff?url2=draft-ietf-ospf-sr-yang-05


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From nobody Mon Jul  2 01:38:18 2018
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From nobody Mon Jul  2 08:18:24 2018
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Subject: [Lsr] I-D Action: draft-ietf-isis-yang-isis-cfg-21.txt
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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           : YANG Data Model for IS-IS protocol
        Authors         : Stephane Litkowski
                          Derek Yeung
                          Acee Lindem
                          Jeffrey Zhang
                          Ladislav Lhotka
	Filename        : draft-ietf-isis-yang-isis-cfg-21.txt
	Pages           : 104
	Date            : 2018-07-02

Abstract:
   This document defines a YANG data model that can be used to configure
   and manage IS-IS protocol on network elements.



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-isis-yang-isis-cfg/

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From nobody Mon Jul  2 10:01:20 2018
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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           : IS-IS Routing with Reverse Metric
        Authors         : Naiming Shen
                          Shane Amante
                          Mikael Abrahamsson
	Filename        : draft-ietf-isis-reverse-metric-11.txt
	Pages           : 14
	Date            : 2018-07-02

Abstract:
   This document describes a mechanism to allow IS-IS routing to quickly
   and accurately shift traffic away from either a point-to-point or
   multi-access LAN interface during network maintenance or other
   operational events.  This is accomplished by signaling adjacent IS-IS
   neighbors with a higher reverse metric, i.e., the metric towards the
   signaling IS-IS router.


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From nobody Mon Jul  2 13:31:41 2018
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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           : Yang Data Model for OSPF Protocol
        Authors         : Derek Yeung
                          Yingzhen Qu
                          Jeffrey Zhang
                          Ing-Wher Chen
                          Acee Lindem
	Filename        : draft-ietf-ospf-yang-12.txt
	Pages           : 109
	Date            : 2018-07-02

Abstract:
   This document defines a YANG data model that can be used to configure
   and manage OSPF.


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From nobody Tue Jul  3 09:03:30 2018
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From: "\"IETF Secretariat\"" <agenda@ietf.org>
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Subject: [Lsr] lsr - Requested session has been scheduled for IETF 102
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Dear Acee Lindem,

The session(s) that you have requested have been scheduled.
Below is the scheduled session information followed by
the original request. 


    lsr Session 1 (2:30 requested)
    Monday, 16 July 2018, Morning Session I 0930-1200
    Room Name: Van Horne size: 130
    ---------------------------------------------


iCalendar: https://datatracker.ietf.org/meeting/102/sessions/lsr.ics

Request Information:


---------------------------------------------------------
Working Group Name: Link State Routing
Area Name: Routing Area
Session Requester: Acee Lindem

Number of Sessions: 1
Length of Session(s):  2.5 Hours
Number of Attendees: 70
Conflicts to Avoid: 
 First Priority: idr rtgwg rtgarea lsvr rift spring
 Second Priority: bess bier netmod



People who must be present:
  Acee Lindem
  Christian Hopps
  Alvaro Retana

Resources Requested:

Special Requests:
  
---------------------------------------------------------


From nobody Tue Jul  3 09:13:38 2018
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From: "Acee Lindem (acee)" <acee@cisco.com>
To: Lizhenbin <lizhenbin@huawei.com>, "grow@ietf.org" <grow@ietf.org>, "opsawg@ietf.org" <opsawg@ietf.org>
CC: "Guyunan (Yunan Gu, IP Technology Research Dept. NW)" <guyunan@huawei.com>, "lsr@ietf.org" <lsr@ietf.org>, "rtgwg@ietf.org" <rtgwg@ietf.org>
Thread-Topic: [GROW] FW: New Version Notification for draft-gu-network-mornitoring-protol-00.txt
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Date: Tue, 3 Jul 2018 16:08:56 +0000
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References: <E793174E-A65C-4E8D-89D7-DC602C5494E8@cisco.com> <5A5B4DE12C0DAC44AF501CD9A2B01A8D8F43F070@dggemm512-mbx.china.huawei.com>
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From nobody Tue Jul  3 11:46:06 2018
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From: Randy Bush <randy@psg.com>
To: "Acee Lindem (acee)" <acee=40cisco.com@dmarc.ietf.org>
Cc: Lizhenbin <lizhenbin@huawei.com>, "grow@ietf.org" <grow@ietf.org>, "opsawg@ietf.org" <opsawg@ietf.org>, "lsr@ietf.org" <lsr@ietf.org>, "rtgwg@ietf.org" <rtgwg@ietf.org>
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Subject: Re: [Lsr] [OPSAWG] [GROW] FW: New Version Notification for draft-gu-network-mornitoring-protol-00.txt
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i am confused as why this is in grow.  it's protocol.

randy


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Date: Tue, 03 Jul 2018 14:15:06 -0700
From: Jeff Tantsura <jefftant.ietf@gmail.com>
To: "Acee Lindem (acee)" <acee=40cisco.com@dmarc.ietf.org>, Lizhenbin <lizhenbin@huawei.com>, "grow@ietf.org" <grow@ietf.org>, "opsawg@ietf.org" <opsawg@ietf.org>
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Thread-Topic: [Lsr] [GROW] FW: New Version Notification for draft-gu-network-mornitoring-protol-00.txt
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Subject: Re: [Lsr] [GROW] FW: New Version Notification for draft-gu-network-mornitoring-protol-00.txt
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Robin,

Pretty much same comment as Acee - I'm not clear as to why...
Protocol YANG models developed in the last years clearly provide much bette=
r and more scalable approach to what has been proposed in the draft, since w=
e are talking is-is - look at notifications in draft-ietf-isis-yang-isis-cfg=
. How do you propose to corelate operational state to configuration?

gRPC provides high performance RPC framework  to streaming the telemetry da=
ta that is structured, easy to consume and extend.=20

I'm not going to go into technical discussion, however would appreciate you=
r response as to why NMP (please do not restate the points in the section 4 =
of the draft, they are quite incorrect)=20

Thanks!

Cheers,
Jeff

=EF=BB=BFOn 7/3/18, 09:21, "Lsr on behalf of Acee Lindem (acee)" <lsr-bounces@iet=
f.org on behalf of acee=3D40cisco.com@dmarc.ietf.org> wrote:

    Hi Robin,=20
    I'm not arguing to deprecate BMP. What I am arguing is that the fact th=
at BMP was created 15 years ago doesn't necessarily mean we should create an=
 analogous IMP for IS-IS given the current IETF OPS technologies and the fac=
t that faster link speeds and Moore's law facilitate deployment of these new=
 OPS technologies. Anyway, I looked at the agenda and I will definitely atte=
nd GROW on Wednesday afternoon for the discussion.=20
    Thanks,
    Acee=20
   =20
    =EF=BB=BFOn 7/3/18, 6:40 AM, "Lizhenbin" <lizhenbin@huawei.com> wrote:
   =20
        Hi Acee,
        Thank for your attention to the new draft. Please refer to my reply=
 inline.
       =20
        Best Regards,
        Robin
       =20
       =20
       =20
        -----Original Message-----
        From: OPSAWG [mailto:opsawg-bounces@ietf.org] On Behalf Of Acee Lin=
dem (acee)
        Sent: Monday, July 02, 2018 9:24 PM
        To: Guyunan (Yunan Gu, IP Technology Research Dept. NW) <guyunan@hu=
awei.com>; grow@ietf.org; opsawg@ietf.org
        Subject: Re: [OPSAWG] [GROW] FW: New Version Notification for draft=
-gu-network-mornitoring-protol-00.txt
       =20
        Hi Yunan, Shunwan, and Zhenbin,=20
       =20
        What are the advantages of inventing a new protocol over just using=
 YANG and NETCONF, RESTCONF, or gNMI?=20
        [Robin] In the draft we simply mention the difference between NMP a=
nd protocols you mentioned for the management plane. Though there is maybe s=
ome overlap between the two types of protocols, the protocols you mentioned =
is not enough for monitoring the control protocol. For example, would we lik=
e to use YANG and NETCONF, RESTCONF, or gNMI to export the packets of contro=
l protocols such as update message of BGP and/or ISIS PDU, etc. for the purp=
ose of monitoring?
       =20
       =20
        Operators and vendors are doing this anyway. A second alternative w=
ould be to listen passively in IS-IS (or OSPF for that matter). Why would an=
yone want this?=20
        [Robin] In fact we tried the method you proposed. From our point of=
 view, the basic design principle should be that the monitoring entity shoul=
d be decoupled from the monitored entity. This is to avoid following cases:
        1. The failure of operation of the control protocol may affect the =
monitoring at the same time.
        2. The limitation of the control protocol will also have effect on =
the monitoring. For example, for the method of listening passively, if there=
 are multiple hops between the listener and the network devices, it has to s=
et up a tunnel as the virtual link for direct connection. But the TCP-based =
monitoring protocol need not care about it.=20
       =20
       =20
        As far as where it belongs, we have a rather full agenda in LSR so =
I don't think we want to devote time to it there at IETF 102. =20
        [Robin] Though the WG the draft should belong to is not determined =
yet, we think the work belongs to OPS area and send the notice to GROW WG an=
d OPSAWG. We also applied for the presentation in the two WGs. We should hav=
e copied the notice to the related WGs of RTG area. So the LSR WG and RTGWG =
WG mailing list are added. More comments and suggestions are welcome.
       =20
        Thanks,
        Acee
       =20
       =20
       =20
        On 7/2/18, 8:20 AM, "GROW on behalf of Guyunan (Yunan Gu, IP Techno=
logy Research Dept. NW)" <grow-bounces@ietf.org on behalf of guyunan@huawei.=
com> wrote:
       =20
            Dear GROW & OPSAWG WGs,
           =20
            We have proposed a Network Monitoring Protocol (NMP) for the co=
ntrol plane OAM. NMP for ISIS is illustrated in this draft to showcase the b=
enefit and operation of NMP. Yet, we haven't decided which WG it belongs to.=
=20
       =20
          =20
            Comments and suggestions are very welcome!=20
           =20
            Thank you!
           =20
           =20
            Yunan Gu
            Huawei Technologies Co. Ltd
           =20
            -----Original Message-----
            From: internet-drafts@ietf.org [mailto:internet-drafts@ietf.org=
]=20
            Sent: 2018=E5=B9=B47=E6=9C=882=E6=97=A5 20:07
            To: Zhuangshunwan <zhuangshunwan@huawei.com>; Lizhenbin <lizhen=
bin@huawei.com>; Guyunan (Yunan Gu, IP Technology Research Dept. NW) <guyuna=
n@huawei.com>
            Subject: New Version Notification for draft-gu-network-mornitor=
ing-protol-00.txt
           =20
           =20
            A new version of I-D, draft-gu-network-mornitoring-protol-00.tx=
t
            has been successfully submitted by Yunan Gu and posted to the I=
ETF repository.
           =20
            Name:		draft-gu-network-mornitoring-protol
            Revision:	00
            Title:		Network Monitoring Protocol (NMP)
            Document date:	2018-07-02
            Group:		Individual Submission
            Pages:		15
            URL:            https://www.ietf.org/internet-drafts/draft-gu-n=
etwork-mornitoring-protol-00.txt
            Status:         https://datatracker.ietf.org/doc/draft-gu-netwo=
rk-mornitoring-protol/
            Htmlized:       https://tools.ietf.org/html/draft-gu-network-mo=
rnitoring-protol-00
            Htmlized:       https://datatracker.ietf.org/doc/html/draft-gu-=
network-mornitoring-protol
           =20
           =20
            Abstract:
               To enable automated network OAM (Operations, administration =
and
               management), the availability of network protocol running st=
atus
               information is a fundamental step.  In this document, a netw=
ork
               monitoring protocol (NMP) is proposed to provision the infor=
mation
               related to running status of IGP (Interior Gateway Protocol)=
 and
               other control protocols.  It can facilitate the network
               troubleshooting of control protocols in a network domain.  T=
ypical
               network issues are illustrated as the usecases of NMP for IS=
IS to
               showcase the necessity of NMP.  Then the operations and the =
message
               formats of NMP for ISIS are defined.  In this document ISIS =
is used
               as the illustration protocol, and the case of OSPF and other=
 control
               protocols will be included in the future version.
           =20
           =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.iet=
f.org.
           =20
            The IETF Secretariat
           =20
            _______________________________________________
            GROW mailing list
            GROW@ietf.org
            https://www.ietf.org/mailman/listinfo/grow
           =20
       =20
        _______________________________________________
        OPSAWG mailing list
        OPSAWG@ietf.org
        https://www.ietf.org/mailman/listinfo/opsawg
       =20
   =20
    _______________________________________________
    Lsr mailing list
    Lsr@ietf.org
    https://www.ietf.org/mailman/listinfo/lsr
   =20



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Subject: Re: [Lsr] IPR poll for draft-ietf-isis-reverse-metric-10
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<html><head></head><body dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="ApplePlainTextBody"><div class="ApplePlainTextBody">Apologies for the delay in responding. &nbsp;I am not personally aware of IPR related to draft-ietf-isis-reverse-metric-10 and Apple will continue to abide by RFC 8179.<br><br>Thanks,<br><br>-shane<br><br><br><blockquote type="cite">On Jun 18, 2018, at 4:31 PM, Christian Hopps &lt;chopps@chopps.org&gt; wrote:<br><br>Hi Authors,<br><br>Can you please respond (including the mailing list) indicating if you are aware of any IPR relating to draft-ietf-isis-reverse-metric?<br><br>Thanks,<br>Chris.<br><br>_______________________________________________<br>Lsr mailing list<br>Lsr@ietf.org<br>https://www.ietf.org/mailman/listinfo/lsr<br></blockquote><br></div></body></html>


From nobody Tue Jul  3 18:59:20 2018
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From: Lizhenbin <lizhenbin@huawei.com>
To: Randy Bush <randy@psg.com>, "Acee Lindem (acee)" <acee=40cisco.com@dmarc.ietf.org>
CC: "grow@ietf.org" <grow@ietf.org>, "opsawg@ietf.org" <opsawg@ietf.org>, "lsr@ietf.org" <lsr@ietf.org>, "rtgwg@ietf.org" <rtgwg@ietf.org>
Thread-Topic: [OPSAWG] [GROW] FW: New Version Notification for draft-gu-network-mornitoring-protol-00.txt
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Subject: Re: [Lsr] [OPSAWG] [GROW] FW: New Version Notification for draft-gu-network-mornitoring-protol-00.txt
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Hi Randy,
Since BMP is promoted in GROW WG, the work has much similarity with BMP. So=
 we applied for the presentation here.

Best Regards,
Robin



-----Original Message-----
From: Randy Bush [mailto:randy@psg.com]=20
Sent: Wednesday, July 04, 2018 2:46 AM
To: Acee Lindem (acee) <acee=3D40cisco.com@dmarc.ietf.org>
Cc: Lizhenbin <lizhenbin@huawei.com>; grow@ietf.org; opsawg@ietf.org; lsr@i=
etf.org; rtgwg@ietf.org
Subject: Re: [OPSAWG] [GROW] FW: New Version Notification for draft-gu-netw=
ork-mornitoring-protol-00.txt

i am confused as why this is in grow.  it's protocol.

randy


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From: Lizhenbin <lizhenbin@huawei.com>
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From: "Einar Nilsen-Nygaard (einarnn)" <einarnn@cisco.com>
To: Lizhenbin <lizhenbin@huawei.com>
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Thread-Topic: [OPSAWG] [Lsr] [GROW] FW: New Version Notification for draft-gu-network-mornitoring-protol-00.txt
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Date: Thu, 5 Jul 2018 11:45:48 +0000
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From: "Acee Lindem (acee)" <acee@cisco.com>
To: Lizhenbin <lizhenbin@huawei.com>, "grow@ietf.org" <grow@ietf.org>, "opsawg@ietf.org" <opsawg@ietf.org>
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Thread-Topic: [GROW] FW: New Version Notification for draft-gu-network-mornitoring-protol-00.txt
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From: "Acee Lindem (acee)" <acee@cisco.com>
To: Lizhenbin <lizhenbin@huawei.com>, Jeff Tantsura <jefftant.ietf@gmail.com>,  "Acee Lindem (acee)" <acee=40cisco.com@dmarc.ietf.org>, "grow@ietf.org" <grow@ietf.org>, "opsawg@ietf.org" <opsawg@ietf.org>
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Thread-Topic: [GROW] [Lsr] FW: New Version Notification for draft-gu-network-mornitoring-protol-00.txt
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Date: Thu, 05 Jul 2018 16:48:39 -0700
From: Jeff Tantsura <jefftant.ietf@gmail.com>
To: <stephane.litkowski@orange.com>, "=?UTF-8?B?5b6Q5bCP6JmO?=  (=?UTF-8?B?5LmJ5YWI?=)" <xiaohu.xxh@alibaba-inc.com>, "mpls@ietf.org" <mpls@ietf.org>
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Subject: Re: [Lsr] [mpls] Comments on draft-ietf-mpls-spring-entropy-label
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Hi,

=20

Please see inline (MSD section).

Hope this clarifies, thanks!

=20

Cheers,

Jeff

=20

=20

=20

[jeff] both IGP drafts have identical description of the BMI-MSD:

=E2=80=9CBase MPLS Imposition MSD (BMI-MSD) signals the total number of MPLS labe=
ls a node is capable of imposing, including all service/transport/special la=
bels.=E2=80=9D

PCEP draft supports only a subset of overall MSD functionality and in gener=
al it is expected that this info would come from IGPs(BGP-LS).

However the functoriality provided by PCEP is inline with the =C2=A0BMI-MSD def=
inition in the IGP drafts, at the node granularity only though.=20

=20

=20

3. Section 5 introduces the MSD concept. I wonder whether this concept is a=
ligned with the MSD concept as defined in the PCEP-SR draft or the MSD conce=
pt as defined in the IGP-MSD draft. In PCEP-SR draft, it said "
The "Maximum SID Depth" (1
   octet) field (MSD) specifies the maximum number of SIDs (MPLS label
   stack depth in the context of this document) that a PCC is capable of
   imposing on a packet.
=20
In the IGP-MSD draft, it said "
MSD of type 1 (IANA Registry), called Base MSD is used to signal the
   total number of SIDs a node is capable of imposing, to be used by a
   path computation element/controller.  "
=20
If I understand it correctly, the MSD in this draft=3D=3Dthe MSD in PCEP-SR dra=
ft=3D=3Dthe Base MSD (i.e., the MSD of type 1), No?
=20

[SLI] Today, the two IGP drafts does not seem to agree on the definition
ISIS says:=E2=80=9D Base MPLS Imposition MSD (BMI-MSD) signals the total number o=
f MPLS
   labels a node is capable of imposing, including all

   service/transport/special labels.=E2=80=9D
OSPF says:=E2=80=9D MSD of type 1 (IANA Registry) is used to signal the number of=
 SIDs a
   node is capable of imposing, to be used by a path computation

   element/controller and is only relevant to the part of the stack

   created as the result of the computation.=E2=80=9D

=20

MSD is just MSD is defines a maximum number of labels to be pushed. This is=
 the definition we use and it is compliant with the one used in PCEP-SR:
=E2=80=9CThe "Maximum SID Depth" (1
   octet) field (MSD) specifies the maximum number of SIDs (MPLS label

   stack depth in context of this document) that a PCC is capable of

   imposing on a packet.=E2=80=9D

=20

As we also say: =E2=80=9CThis includes any kind of labels (service, entropy, tran=
sport...).=E2=80=9D, we are compliant with the BMI-MSD defined in IS-IS.

=20

=20

=20

Best regards,

Xiaohu
___________________________________________________________________________=
______________________________________________
=20
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urple><div class=3DWordSection1><p class=3DMsoNormal><span style=3D'font-size:11.0=
pt;font-family:"Calibri",sans-serif'>Hi,<o:p></o:p></span></p><p class=3DMsoNo=
rmal><span style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'><o:p>&n=
bsp;</o:p></span></p><p class=3DMsoNormal><span style=3D'font-size:11.0pt;font-f=
amily:"Calibri",sans-serif'>Please see inline (MSD section).<o:p></o:p></spa=
n></p><p class=3DMsoNormal><span style=3D'font-size:11.0pt;font-family:"Calibri"=
,sans-serif'>Hope this clarifies, thanks!<o:p></o:p></span></p><p class=3DMsoN=
ormal><span style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'><o:p>&=
nbsp;</o:p></span></p><div><p class=3DMsoNormal><span style=3D'font-size:11.0pt;=
font-family:"Calibri",sans-serif;color:black'>Cheers,<o:p></o:p></span></p><=
/div><p class=3DMsoNormal><span style=3D'font-size:11.0pt;font-family:"Calibri",=
sans-serif;color:black'>Jeff</span><span style=3D'font-size:11.0pt;font-family=
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'font-size:11.0pt;font-family:"Calibri",sans-serif'><o:p>&nbsp;</o:p></span>=
</p><div><div><div><div><p class=3DMsoNormal><span style=3D'font-size:10.5pt;fon=
t-family:"Tahoma",sans-serif;color:black'>&nbsp;</span><o:p></o:p></p></div>=
<div><p class=3DMsoNormal><span style=3D'font-size:10.5pt;font-family:"Tahoma",s=
ans-serif;border:none windowtext 1.0pt;padding:0in'><o:p>&nbsp;</o:p></span>=
</p><p class=3DMsoNormal><span style=3D'font-size:11.0pt;font-family:"Calibri",s=
ans-serif;border:none windowtext 1.0pt;padding:0in'>[jeff] both IGP drafts h=
ave identical description of the BMI-MSD:<o:p></o:p></span></p><p class=3DMsoN=
ormal><span style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif;border:=
none windowtext 1.0pt;padding:0in'>=E2=80=9CBase MPLS Imposition MSD (BMI-MSD) sig=
nals the total number of MPLS labels a node is capable of imposing, includin=
g all service/transport/special labels.=E2=80=9D<o:p></o:p></span></p><p class=3DMso=
Normal><span style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif;border=
:none windowtext 1.0pt;padding:0in'>PCEP draft supports only a subset of ove=
rall MSD functionality and in general it is expected that this info would co=
me from IGPs(BGP-LS).<o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'f=
ont-size:11.0pt;font-family:"Calibri",sans-serif;border:none windowtext 1.0p=
t;padding:0in'>However the functoriality provided by PCEP is inline with the=
 =C2=A0BMI-MSD definition in the IGP drafts, at the node granularity only though=
. <o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'font-size:11.0pt;fon=
t-family:"Calibri",sans-serif;border:none windowtext 1.0pt;padding:0in'><o:p=
>&nbsp;</o:p></span></p><p class=3DMsoNormal><span style=3D'font-size:11.0pt;fon=
t-family:"Calibri",sans-serif;border:none windowtext 1.0pt;padding:0in'><o:p=
>&nbsp;</o:p></span></p><p class=3DMsoNormal><span style=3D'font-size:10.5pt;fon=
t-family:"Tahoma",sans-serif;color:black;border:none windowtext 1.0pt;paddin=
g:0in'>3. Section 5 introduces the MSD concept. I wonder whether this concep=
t is aligned with the MSD concept as defined in the PCEP-SR draft or the <sp=
an style=3D'background:white'>MSD concept</span> as defined in the IGP-MSD dra=
ft. In PCEP-SR draft, it said &quot;</span><o:p></o:p></p><pre><span style=3D'=
color:black'>The &quot;Maximum SID Depth&quot; (1</span><o:p></o:p></pre><pr=
e><span style=3D'color:black'>&nbsp;&nbsp; octet) field (MSD) specifies the ma=
ximum number of SIDs (MPLS label</span><o:p></o:p></pre><pre><span style=3D'co=
lor:black'>&nbsp;&nbsp; stack depth in the context of this document) that a =
PCC is capable of</span><o:p></o:p></pre><pre><span style=3D'color:black'>&nbs=
p;&nbsp; imposing on a packet.</span><o:p></o:p></pre><pre style=3D'break-befo=
re:page;font-variant-caps:normal;text-align:start'><span style=3D'color:black'=
>&nbsp;</span><o:p></o:p></pre><pre style=3D'break-before:page;font-variant-ca=
ps:normal;text-align:start'><span style=3D'color:black'>In the IGP-MSD draft, =
it said &quot;</span><o:p></o:p></pre><pre style=3D'break-before:page;font-var=
iant-caps:normal;text-align:start'><span style=3D'color:black'>MSD of type 1 (=
IANA Registry), called Base MSD is used to signal the</span><o:p></o:p></pre=
><pre><span style=3D'color:black'>&nbsp;&nbsp; total number of SIDs a node is =
capable of imposing, to be used by a</span><o:p></o:p></pre><pre><span style=
=3D'color:black'>&nbsp;&nbsp; path computation element/controller.&nbsp; &quot=
;</span><o:p></o:p></pre><pre style=3D'break-before:page;font-variant-caps:nor=
mal;text-align:start'><span style=3D'color:black'>&nbsp;</span><o:p></o:p></pr=
e><pre style=3D'break-before:page;font-variant-caps:normal;text-align:start'><=
span style=3D'color:black'>If I understand it correctly, the MSD in this draft=
=3D=3Dthe MSD in PCEP-SR draft=3D=3Dthe Base MSD (i.e., the MSD of type 1), No?</spa=
n><o:p></o:p></pre><p class=3DMsoNormal><span style=3D'font-size:10.5pt;font-fam=
ily:"Tahoma",sans-serif;color:#1F497D'>&nbsp;</span><o:p></o:p></p><p class=3D=
MsoNormal><span style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif;col=
or:#1F497D'>[SLI] Today, the two IGP drafts does not seem to agree on the de=
finition</span><o:p></o:p></p><pre><span style=3D'font-size:11.0pt;font-family=
:"Calibri",sans-serif;color:#1F497D'>ISIS says:=E2=80=9D</span><span style=3D'color:=
black'> Base MPLS Imposition MSD (BMI-MSD) signals the total number of MPLS<=
/span><o:p></o:p></pre><p class=3DMsoNormal><span style=3D'font-size:10.0pt;font=
-family:"Courier New";color:black'>&nbsp;&nbsp; labels a node is capable of =
imposing, including all</span><o:p></o:p></p><p class=3DMsoNormal><span style=3D=
'font-size:10.0pt;font-family:"Courier New";color:black'>&nbsp;&nbsp; servic=
e/transport/special labels.=E2=80=9D</span><o:p></o:p></p><pre><span style=3D'color:=
black'>OSPF says:=E2=80=9D MSD of type 1 (IANA Registry) is used to signal the num=
ber of SIDs a</span><o:p></o:p></pre><p class=3DMsoNormal><span style=3D'font-si=
ze:10.0pt;font-family:"Courier New";color:black'>&nbsp;&nbsp; node is capabl=
e of imposing, to be used by a path computation</span><o:p></o:p></p><p clas=
s=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Courier New";color:bl=
ack'>&nbsp;&nbsp; element/controller and is only relevant to the part of the=
 stack</span><o:p></o:p></p><p class=3DMsoNormal><span style=3D'font-size:10.0pt=
;font-family:"Courier New";color:black'>&nbsp;&nbsp; created as the result o=
f the computation.=E2=80=9D</span><o:p></o:p></p><p class=3DMsoNormal><span style=3D'f=
ont-size:10.0pt;font-family:"Courier New";color:black'>&nbsp;</span><o:p></o=
:p></p><p class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Courier=
 New";color:black'>MSD is just MSD is defines a maximum number of labels to =
be pushed. This is the definition we use and it is compliant with the one us=
ed in PCEP-SR:</span><o:p></o:p></p><pre><span style=3D'color:black'>=E2=80=9CThe &q=
uot;Maximum SID Depth&quot; (1</span><o:p></o:p></pre><p class=3DMsoNormal><sp=
an style=3D'font-size:10.0pt;font-family:"Courier New";color:black'>&nbsp;&nbs=
p; octet) field (MSD) specifies the maximum number of SIDs (MPLS label</span=
><o:p></o:p></p><p class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family=
:"Courier New";color:black'>&nbsp; &nbsp;stack depth in context of this docu=
ment) that a PCC is capable of</span><o:p></o:p></p><p class=3DMsoNormal><span=
 style=3D'font-size:10.0pt;font-family:"Courier New";color:black'>&nbsp;&nbsp;=
 imposing on a packet.=E2=80=9D</span><o:p></o:p></p><p class=3DMsoNormal><span styl=
e=3D'font-size:10.0pt;font-family:"Courier New";color:black'>&nbsp;</span><o:p=
></o:p></p><p class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Cou=
rier New";color:black'>As we also say: =E2=80=9CThis includes any kind of labels (=
service, entropy, transport...).=E2=80=9D, we are compliant with the BMI-MSD defin=
ed in IS-IS.</span><o:p></o:p></p><p class=3DMsoNormal><span style=3D'font-size:=
10.0pt;font-family:"Courier New";color:black'>&nbsp;</span><o:p></o:p></p><p=
 class=3DMsoNormal><span style=3D'font-size:11.0pt;font-family:"Calibri",sans-se=
rif;color:#1F497D'>&nbsp;</span><o:p></o:p></p><p class=3DMsoNormal><span styl=
e=3D'font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>&nbsp;</=
span><o:p></o:p></p></div><div><p class=3DMsoNormal><span style=3D'font-size:10.=
5pt;font-family:"Tahoma",sans-serif;color:black;border:none windowtext 1.0pt=
;padding:0in'>Best regards,</span><o:p></o:p></p></div><div><p class=3DMsoNorm=
al><span style=3D'font-size:10.5pt;font-family:"Tahoma",sans-serif;color:black=
;border:none windowtext 1.0pt;padding:0in'>Xiaohu</span><o:p></o:p></p></div=
></div></div></div><pre>____________________________________________________=
_____________________________________________________________________<o:p></=
o:p></pre><pre><o:p>&nbsp;</o:p></pre><pre>Ce message et ses pieces jointes =
peuvent contenir des informations confidentielles ou privilegiees et ne doiv=
ent donc<o:p></o:p></pre><pre>pas etre diffuses, exploites ou copies sans au=
torisation. Si vous avez recu ce message par erreur, veuillez le signaler<o:=
p></o:p></pre><pre>a l'expediteur et le detruire ainsi que les pieces jointe=
s. Les messages electroniques etant susceptibles d'alteration,<o:p></o:p></p=
re><pre>Orange decline toute responsabilite si ce message a ete altere, defo=
rme ou falsifie. Merci.<o:p></o:p></pre><pre><o:p>&nbsp;</o:p></pre><pre>Thi=
s message and its attachments may contain confidential or privileged informa=
tion that may be protected by law;<o:p></o:p></pre><pre>they should not be d=
istributed, used or copied without authorisation.<o:p></o:p></pre><pre>If yo=
u have received this email in error, please notify the sender and delete thi=
s message and its attachments.<o:p></o:p></pre><pre>As emails may be altered=
, Orange is not liable for messages that have been modified, changed or fals=
ified.<o:p></o:p></pre><pre>Thank you.<o:p></o:p></pre><p class=3DMsoNormal><s=
pan style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'>______________=
_________________________________ mpls mailing list mpls@ietf.org https://ww=
w.ietf.org/mailman/listinfo/mpls <o:p></o:p></span></p></div></body></html>

--B_3613654121_139486885--



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From: Randy Bush <randy@psg.com>
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Subject: Re: [Lsr] [GROW] FW: New Version Notification for draft-gu-network-mornitoring-protol-00.txt
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robin,

> It is not described clearly in the draft that reusing BMP is also a
> possible option for monitoring IGP. We will refine the draft.  

if i could also use bmp for monitoring dns, smtp, and ntp, i could
stop using nagios!

i think what acee is trying to say is that "B" in BMP does not stand
for Bypass.

randy


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From: "Ketan Talaulikar (ketant)" <ketant@cisco.com>
To: =?utf-8?B?5b6Q5bCP6JmOKOS5ieWFiCk=?= <xiaohu.xxh@alibaba-inc.com>, "Jeff Tantsura" <jefftant.ietf@gmail.com>, "stephane.litkowski" <stephane.litkowski@orange.com>, "mpls@ietf.org" <mpls@ietf.org>
CC: "lsr@ietf.org" <lsr@ietf.org>, "pce@ietf.org" <pce@ietf.org>
Thread-Topic: [mpls]  Comments on draft-ietf-mpls-spring-entropy-label
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Date: Fri, 6 Jul 2018 02:23:16 +0000
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References: <43768014-1ce8-43d0-9f9b-04eba6f87904.xiaohu.xxh@alibaba-inc.com> <7608_1530829167_5B3E996F_7608_323_1_9E32478DFA9976438E7A22F69B08FF924B1F0131@OPEXCLILMA4.corporate.adroot.infra.ftgroup>, <EC8F6C49-5D83-467B-9C4D-07EEFC9CBEFE@gmail.com> <2520eff6-aafa-42af-99e7-0374f0dd027b.xiaohu.xxh@alibaba-inc.com>
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From: Huzhibo <huzhibo@huawei.com>
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Thread-Topic: [Lsr] IETF 102 LSR Working Group Call for Agenda Items
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From: Lizhenbin <lizhenbin@huawei.com>
To: "Acee Lindem (acee)" <acee@cisco.com>, Randy Bush <randy@psg.com>, "Jeff Tantsura" <jefftant.ietf@gmail.com>, "Acee Lindem (acee)" <acee=40cisco.com@dmarc.ietf.org>, "grow@ietf.org" <grow@ietf.org>, "opsawg@ietf.org" <opsawg@ietf.org>
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Thread-Topic: [GROW] [Lsr] FW: New Version Notification for draft-gu-network-mornitoring-protol-00.txt
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Thread-Topic: [mpls] Comments on draft-ietf-mpls-spring-entropy-label
Thread-Index: AQHUFBEZ4EJ3HXR8sUadOhOWKPsIEqSBKPaQgAAX8QCAAJpxsA==
Date: Fri, 6 Jul 2018 08:22:57 +0000
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Subject: Re: [Lsr] [mpls] Comments on draft-ietf-mpls-spring-entropy-label
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=E2=80=8BWhy anyone would need BMP wrapper to monitor IGP ?

BGP has been recently polluted enough that it works just perfectly fine
without a new draft/rfc or single line of code change to act as IGP
monitoring protocol.

Just enable  AFI 16388 / SAFI 71 as described in RFC7752 (possibly with
many additional follow-up extensions being currently cooked) and ride on.

r.

On Fri, Jul 6, 2018 at 2:14 AM, Randy Bush <randy@psg.com> wrote:

> robin,
>
> > It is not described clearly in the draft that reusing BMP is also a
> > possible option for monitoring IGP. We will refine the draft.
>
> if i could also use bmp for monitoring dns, smtp, and ntp, i could
> stop using nagios!
>
> i think what acee is trying to say is that "B" in BMP does not stand
> for Bypass.
>
> randy
>
> _______________________________________________
> OPSAWG mailing list
> OPSAWG@ietf.org
> https://www.ietf.org/mailman/listinfo/opsawg
>

--00000000000075815b05705156b7
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-family:arial,he=
lvetica,sans-serif;font-size:small">=E2=80=8BWhy anyone would need BMP wrap=
per to monitor IGP ?=C2=A0</div><div class=3D"gmail_default" style=3D"font-=
family:arial,helvetica,sans-serif;font-size:small"><br></div><div class=3D"=
gmail_default" style=3D"font-family:arial,helvetica,sans-serif;font-size:sm=
all">BGP has been recently polluted enough that it works just perfectly fin=
e without a new draft/rfc or single line of code change to act as IGP monit=
oring protocol.=C2=A0</div><div class=3D"gmail_default" style=3D"font-famil=
y:arial,helvetica,sans-serif;font-size:small"><br></div><div class=3D"gmail=
_default" style=3D"font-family:arial,helvetica,sans-serif;font-size:small">=
Just enable =C2=A0AFI 16388 / SAFI 71 as described in RFC7752 (possibly wit=
h many additional follow-up extensions being currently cooked) and ride on.=
=C2=A0</div><div class=3D"gmail_default" style=3D"font-family:arial,helveti=
ca,sans-serif;font-size:small"><br></div><div class=3D"gmail_default" style=
=3D"font-family:arial,helvetica,sans-serif;font-size:small">r.</div></div><=
div class=3D"gmail_extra"><br><div class=3D"gmail_quote">On Fri, Jul 6, 201=
8 at 2:14 AM, Randy Bush <span dir=3D"ltr">&lt;<a href=3D"mailto:randy@psg.=
com" target=3D"_blank">randy@psg.com</a>&gt;</span> wrote:<br><blockquote c=
lass=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;=
padding-left:1ex">robin,<br>
<span class=3D""><br>
&gt; It is not described clearly in the draft that reusing BMP is also a<br=
>
&gt; possible option for monitoring IGP. We will refine the draft.=C2=A0 <b=
r>
<br>
</span>if i could also use bmp for monitoring dns, smtp, and ntp, i could<b=
r>
stop using nagios!<br>
<br>
i think what acee is trying to say is that &quot;B&quot; in BMP does not st=
and<br>
for Bypass.<br>
<span class=3D"HOEnZb"><font color=3D"#888888"><br>
randy<br>
</font></span><div class=3D"HOEnZb"><div class=3D"h5"><br>
______________________________<wbr>_________________<br>
OPSAWG mailing list<br>
<a href=3D"mailto:OPSAWG@ietf.org">OPSAWG@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/opsawg" rel=3D"noreferrer"=
 target=3D"_blank">https://www.ietf.org/mailman/<wbr>listinfo/opsawg</a><br=
>
</div></div></blockquote></div><br></div>

--00000000000075815b05705156b7--


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To: "Acee Lindem (acee)" <acee=40cisco.com@dmarc.ietf.org>, Lizhenbin <lizhenbin@huawei.com>, Jeff Tantsura <jefftant.ietf@gmail.com>, "grow@ietf.org" <grow@ietf.org>, "opsawg@ietf.org" <opsawg@ietf.org>
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Subject: Re: [Lsr] [GROW] FW: New Version Notification for draft-gu-network-mornitoring-protol-00.txt
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On 05/07/2018 23:03, Acee Lindem (acee) wrote:
> Hi Robin,
>
> I know for a fact that there have been applications written that do passive monitoring using IS-IS and simply advertising yourself in overload mode. Additionally, given that all routes in an area have the same LSDB, you don't really have the same requirements as BGP.
>
> With respect to scalability, I believe the advantage of the YANG models is more in terms of consumption and having a single network programmability paradigm rather unique per-protocol monitoring. Additionally, YANG, NETCONF, RESTCONF, gNMI, and streaming telemetry are happening now irrespective of your proposal.
>
> I agree that a custom protocol will result in fewer bits on the wire and potentially less processing on the network device. However, I certainly don't believe that this alone is a reason to do it.
If we want less bits on the wire, then adding support for a binary 
encoding (e.g. CBOR) to the existing YANG management protocols seems 
like a better path forwards to me since that seems to have the widest 
benefit.Â  CBOR encoded YANG (if using numerical "SIDs" rather than 
strings for the field names, draft-ietf-core-yang-cbor) is a pretty 
tight encoding, and is designed for IOT and constrained devices.Â  A CBOR 
encoding probably won't be quite as compact as custom TLVs, but I doubt 
that it would be significantly bigger either, and it has quite a few 
other benefits (code reuse, can be generically decoded).

Thanks,
Rob


>   
>
> Thanks,
> Acee
>
>
> ï»¿On 7/5/18, 6:49 AM, "GROW on behalf of Lizhenbin" <grow-bounces@ietf.org on behalf of lizhenbin@huawei.com> wrote:
>
>      Hi Jeff,
>      Before we propose the NMP idea, we carefully compared it with the existing NETCONF, gRPC and YANG models work:
>      1. Based on my experience in the YANG model work, it may be not satisfactory for these models does not define config/oper of all features of specific protocol and these models have much relation with each other and it is difficult to stabilize the definition.
>      2. For monitoring the control protocol, it is not enough based on the existing YANG models such as the packets of control protocol which should be monitored but not defined in YANG models.
>      3. Performance concern on the existing NETCONF.
>      4. Standardization of the existing gRPC.
>      
>      We would like to define the NMP based on the usecases. That is, a specific set of parameters exported by NMP can satisfy the purpose of a specific usecase. Thus the protocol can be deployed incrementally.
>      
>      
>      Best Regards,
>      Robin
>      
>      
>      
>      -----Original Message-----
>      From: Jeff Tantsura [mailto:jefftant.ietf@gmail.com]
>      Sent: Wednesday, July 04, 2018 5:15 AM
>      To: Acee Lindem (acee) <acee=40cisco.com@dmarc.ietf.org>; Lizhenbin <lizhenbin@huawei.com>; grow@ietf.org; opsawg@ietf.org
>      Cc: lsr@ietf.org; rtgwg@ietf.org; Guyunan (Yunan Gu, IP Technology Research Dept. NW) <guyunan@huawei.com>
>      Subject: Re: [Lsr] [GROW] FW: New Version Notification for draft-gu-network-mornitoring-protol-00.txt
>      
>      Robin,
>      
>      Pretty much same comment as Acee - I'm not clear as to why...
>      Protocol YANG models developed in the last years clearly provide much better and more scalable approach to what has been proposed in the draft, since we are talking is-is - look at notifications in draft-ietf-isis-yang-isis-cfg. How do you propose to corelate operational state to configuration?
>      
>      gRPC provides high performance RPC framework  to streaming the telemetry data that is structured, easy to consume and extend.
>      
>      I'm not going to go into technical discussion, however would appreciate your response as to why NMP (please do not restate the points in the section 4 of the draft, they are quite incorrect)
>      
>      Thanks!
>      
>      Cheers,
>      Jeff
>      
>      On 7/3/18, 09:21, "Lsr on behalf of Acee Lindem (acee)" <lsr-bounces@ietf.org on behalf of acee=40cisco.com@dmarc.ietf.org> wrote:
>      
>          Hi Robin,
>          I'm not arguing to deprecate BMP. What I am arguing is that the fact that BMP was created 15 years ago doesn't necessarily mean we should create an analogous IMP for IS-IS given the current IETF OPS technologies and the fact that faster link speeds and Moore's law facilitate deployment of these new OPS technologies. Anyway, I looked at the agenda and I will definitely attend GROW on Wednesday afternoon for the discussion.
>          Thanks,
>          Acee
>          
>          On 7/3/18, 6:40 AM, "Lizhenbin" <lizhenbin@huawei.com> wrote:
>          
>              Hi Acee,
>              Thank for your attention to the new draft. Please refer to my reply inline.
>              
>              Best Regards,
>              Robin
>              
>              
>              
>              -----Original Message-----
>              From: OPSAWG [mailto:opsawg-bounces@ietf.org] On Behalf Of Acee Lindem (acee)
>              Sent: Monday, July 02, 2018 9:24 PM
>              To: Guyunan (Yunan Gu, IP Technology Research Dept. NW) <guyunan@huawei.com>; grow@ietf.org; opsawg@ietf.org
>              Subject: Re: [OPSAWG] [GROW] FW: New Version Notification for draft-gu-network-mornitoring-protol-00.txt
>              
>              Hi Yunan, Shunwan, and Zhenbin,
>              
>              What are the advantages of inventing a new protocol over just using YANG and NETCONF, RESTCONF, or gNMI?
>              [Robin] In the draft we simply mention the difference between NMP and protocols you mentioned for the management plane. Though there is maybe some overlap between the two types of protocols, the protocols you mentioned is not enough for monitoring the control protocol. For example, would we like to use YANG and NETCONF, RESTCONF, or gNMI to export the packets of control protocols such as update message of BGP and/or ISIS PDU, etc. for the purpose of monitoring?
>              
>              
>              Operators and vendors are doing this anyway. A second alternative would be to listen passively in IS-IS (or OSPF for that matter). Why would anyone want this?
>              [Robin] In fact we tried the method you proposed. From our point of view, the basic design principle should be that the monitoring entity should be decoupled from the monitored entity. This is to avoid following cases:
>              1. The failure of operation of the control protocol may affect the monitoring at the same time.
>              2. The limitation of the control protocol will also have effect on the monitoring. For example, for the method of listening passively, if there are multiple hops between the listener and the network devices, it has to set up a tunnel as the virtual link for direct connection. But the TCP-based monitoring protocol need not care about it.
>              
>              
>              As far as where it belongs, we have a rather full agenda in LSR so I don't think we want to devote time to it there at IETF 102.
>              [Robin] Though the WG the draft should belong to is not determined yet, we think the work belongs to OPS area and send the notice to GROW WG and OPSAWG. We also applied for the presentation in the two WGs. We should have copied the notice to the related WGs of RTG area. So the LSR WG and RTGWG WG mailing list are added. More comments and suggestions are welcome.
>              
>              Thanks,
>              Acee
>              
>              
>              
>              On 7/2/18, 8:20 AM, "GROW on behalf of Guyunan (Yunan Gu, IP Technology Research Dept. NW)" <grow-bounces@ietf.org on behalf of guyunan@huawei.com> wrote:
>              
>                  Dear GROW & OPSAWG WGs,
>                  
>                  We have proposed a Network Monitoring Protocol (NMP) for the control plane OAM. NMP for ISIS is illustrated in this draft to showcase the benefit and operation of NMP. Yet, we haven't decided which WG it belongs to.
>              
>                 
>                  Comments and suggestions are very welcome!
>                  
>                  Thank you!
>                  
>                  
>                  Yunan Gu
>                  Huawei Technologies Co. Ltd
>                  
>                  -----Original Message-----
>                  From: internet-drafts@ietf.org [mailto:internet-drafts@ietf.org]
>                  Sent: 2018å¹´7æœˆ2æ—¥ 20:07
>                  To: Zhuangshunwan <zhuangshunwan@huawei.com>; Lizhenbin <lizhenbin@huawei.com>; Guyunan (Yunan Gu, IP Technology Research Dept. NW) <guyunan@huawei.com>
>                  Subject: New Version Notification for draft-gu-network-mornitoring-protol-00.txt
>                  
>                  
>                  A new version of I-D, draft-gu-network-mornitoring-protol-00.txt
>                  has been successfully submitted by Yunan Gu and posted to the IETF repository.
>                  
>                  Name:		draft-gu-network-mornitoring-protol
>                  Revision:	00
>                  Title:		Network Monitoring Protocol (NMP)
>                  Document date:	2018-07-02
>                  Group:		Individual Submission
>                  Pages:		15
>                  URL:            https://www.ietf.org/internet-drafts/draft-gu-network-mornitoring-protol-00.txt
>                  Status:         https://datatracker.ietf.org/doc/draft-gu-network-mornitoring-protol/
>                  Htmlized:       https://tools.ietf.org/html/draft-gu-network-mornitoring-protol-00
>                  Htmlized:       https://datatracker.ietf.org/doc/html/draft-gu-network-mornitoring-protol
>                  
>                  
>                  Abstract:
>                     To enable automated network OAM (Operations, administration and
>                     management), the availability of network protocol running status
>                     information is a fundamental step.  In this document, a network
>                     monitoring protocol (NMP) is proposed to provision the information
>                     related to running status of IGP (Interior Gateway Protocol) and
>                     other control protocols.  It can facilitate the network
>                     troubleshooting of control protocols in a network domain.  Typical
>                     network issues are illustrated as the usecases of NMP for ISIS to
>                     showcase the necessity of NMP.  Then the operations and the message
>                     formats of NMP for ISIS are defined.  In this document ISIS is used
>                     as the illustration protocol, and the case of OSPF and other control
>                     protocols will be included in the future version.
>                  
>                  
>                                                                                                    
>                  
>                  
>                  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
>                  
>                  _______________________________________________
>                  GROW mailing list
>                  GROW@ietf.org
>                  https://www.ietf.org/mailman/listinfo/grow
>                  
>              
>              _______________________________________________
>              OPSAWG mailing list
>              OPSAWG@ietf.org
>              https://www.ietf.org/mailman/listinfo/opsawg
>              
>          
>          _______________________________________________
>          Lsr mailing list
>          Lsr@ietf.org
>          https://www.ietf.org/mailman/listinfo/lsr
>          
>      
>      
>      _______________________________________________
>      GROW mailing list
>      GROW@ietf.org
>      https://www.ietf.org/mailman/listinfo/grow
>      
>
> _______________________________________________
> rtgwg mailing list
> rtgwg@ietf.org
> https://www.ietf.org/mailman/listinfo/rtgwg


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From: "Einar Nilsen-Nygaard (einarnn)" <einarnn@cisco.com>
To: Robert Wilton <rwilton=40cisco.com@dmarc.ietf.org>
CC: "Acee Lindem (acee)" <acee=40cisco.com@dmarc.ietf.org>, Lizhenbin <lizhenbin@huawei.com>, Jeff Tantsura <jefftant.ietf@gmail.com>, "grow@ietf.org" <grow@ietf.org>, "opsawg@ietf.org" <opsawg@ietf.org>, "lsr@ietf.org" <lsr@ietf.org>, "rtgwg@ietf.org" <rtgwg@ietf.org>
Thread-Topic: [OPSAWG] [GROW] [Lsr] FW: New Version Notification for draft-gu-network-mornitoring-protol-00.txt
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Date: Fri, 6 Jul 2018 09:59:28 +0000
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From: "Acee Lindem (acee)" <acee@cisco.com>
To: "Ketan Talaulikar (ketant)" <ketant=40cisco.com@dmarc.ietf.org>, =?utf-8?B?5b6Q5bCP6JmOKOS5ieWFiCk=?= <xiaohu.xxh@alibaba-inc.com>, "Jeff Tantsura" <jefftant.ietf@gmail.com>, "stephane.litkowski" <stephane.litkowski@orange.com>, "mpls@ietf.org" <mpls@ietf.org>
CC: "lsr@ietf.org" <lsr@ietf.org>, "pce@ietf.org" <pce@ietf.org>
Thread-Topic: [Lsr] [mpls]  Comments on draft-ietf-mpls-spring-entropy-label
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Date: Fri, 6 Jul 2018 11:20:42 +0000
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Subject: Re: [Lsr] [mpls]  Comments on draft-ietf-mpls-spring-entropy-label
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Subject: Re: [Lsr] [OPSAWG] [GROW] FW: New Version Notification for draft-gu-network-mornitoring-protol-00.txt
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> =E2=80=8BWhy anyone would need BMP wrapper to monitor IGP ?

probably similar reasons that folk seem to need bgp-ls to get the
is-is/ospf databases.  is-is and ospf have decades of complexity
layered on un-simple bases.  so we seek yet another layer of gunk
through which to see them more 'simply.'

i would say an optimistic view might be that it will take a couple
more decades to gunk up bgp-ls and bmp so that we want yet another
layer.  but it would appear that my optimism is not warranted.

randy


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From: "Acee Lindem (acee)" <acee@cisco.com>
To: Randy Bush <randy@psg.com>
CC: Robert Raszuk <robert@raszuk.net>, "lsr@ietf.org" <lsr@ietf.org>, "GMO Crops" <grow@ietf.org>, Robin Li <lizhenbin@huawei.com>, "opsawg@ietf.org" <opsawg@ietf.org>, Routing WG <rtgwg@ietf.org>
Thread-Topic: [Lsr] [OPSAWG] [GROW] FW: New Version Notification for draft-gu-network-mornitoring-protol-00.txt
Thread-Index: AQHUFQxJi2/p2VtYZ0ie8WhKgBdAnaSCa0YAgAAHuQA=
Date: Fri, 6 Jul 2018 13:27:00 +0000
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References: <E793174E-A65C-4E8D-89D7-DC602C5494E8@cisco.com> <5A5B4DE12C0DAC44AF501CD9A2B01A8D8F43F070@dggemm512-mbx.china.huawei.com> <35FD4375-DF78-4E5B-A1A4-ACCC332A8E5E@cisco.com> <5A5B4DE12C0DAC44AF501CD9A2B01A8D8F43FE26@dggemm512-mbx.china.huawei.com> <m2y3ep9q4z.wl-randy@psg.com> <CA+b+ER=1u=nyQ3edrqbyQ_8tuHWtynGoW==BWOEAV_1imTgJPQ@mail.gmail.com> <m2o9fka5at.wl-randy@psg.com>
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Subject: Re: [Lsr] [OPSAWG] [GROW] FW: New Version Notification for draft-gu-network-mornitoring-protol-00.txt
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From: "Acee Lindem (acee)" <acee@cisco.com>
To: Huzhibo <huzhibo@huawei.com>
CC: "lsr@ietf.org" <lsr@ietf.org>
Thread-Topic: [Lsr] IETF 102 LSR Working Group Call for Agenda Items
Thread-Index: AQHUFPkeTNqsE7TLkkCbnub2VqRERKSCeB2A
Date: Fri, 6 Jul 2018 13:44:48 +0000
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Subject: Re: [Lsr] IETF 102 LSR Working Group Call for Agenda Items
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Hi Zhibo,

As I told you, the LSR WG agenda is fully subscribed for IETF 102. Note tha=
t dynamic metric adjustment is not a new idea and is supported by many wire=
less routing protocols (e.g., BABEL) as well as EIGRP. However, I realize t=
hat you are proposed a controller framework as opposed to local network adj=
ustments. Perhaps, you could request a slot in the Routing Working Group as=
 they are meeting twice.

Thanks,
Acee

On Jul 6, 2018, at 3:15 AM, Huzhibo <huzhibo@huawei.com<mailto:huzhibo@huaw=
ei.com>> wrote:

Hi,

Request a slot to discuss Network Automatic Optimization Based on Dynamic A=
djustment of IGP Metrics:

Drafts:
https://datatracker.ietf.org/doc/draft-hu-lsr-network-automatic-optimizatio=
n/
Presenter: ZhiBo Hu

Duration: 15 mins

Thanks!
ZHiBo


From: Lsr [mailto:lsr-bounces@ietf.org] On Behalf Of Acee Lindem (acee)
Sent: Monday, June 18, 2018 9:45 PM
To: lsr@ietf.org<mailto:lsr@ietf.org>
Subject: [Lsr] IETF 102 LSR Working Group Call for Agenda Items

Hi Folks,

The LSR (link-state-routing) WG will be meeting on Monday, July 16, 2018 fr=
om 9:30 to 12:00 (the first WG slot of IETF 102).

Please send us (lsr-chairs@ietf.org<mailto:lsr-chairs@ietf.org>) any reques=
ts for presentation slots.

Thanks,
Acee


--_000_70C116FC16C1409999E83CF6421448DFciscocom_
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<html>
<head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Dus-ascii"=
>
</head>
<body style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; line-break:=
 after-white-space;" class=3D"">
Hi Zhibo,&nbsp;
<div class=3D""><br class=3D"">
</div>
<div class=3D"">As I told you, the LSR WG agenda is fully subscribed for IE=
TF 102. Note that dynamic metric adjustment is not a new idea and is suppor=
ted by many wireless routing protocols (e.g., BABEL) as well as EIGRP. Howe=
ver, I realize that you are proposed
 a controller framework as opposed to local network adjustments. Perhaps, y=
ou could request a slot in the Routing Working Group as they are meeting tw=
ice.&nbsp;</div>
<div class=3D""><br class=3D"">
</div>
<div class=3D"">Thanks,</div>
<div class=3D"">Acee<br class=3D"">
<div><br class=3D"">
<blockquote type=3D"cite" class=3D"">
<div class=3D"">On Jul 6, 2018, at 3:15 AM, Huzhibo &lt;<a href=3D"mailto:h=
uzhibo@huawei.com" class=3D"">huzhibo@huawei.com</a>&gt; wrote:</div>
<br class=3D"Apple-interchange-newline">
<div class=3D"">
<div class=3D"WordSection1" style=3D"page: WordSection1; caret-color: rgb(0=
, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-=
variant-caps: normal; font-weight: normal; letter-spacing: normal; text-ali=
gn: start; text-indent: 0px; text-transform: none; white-space: normal; wor=
d-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;">
<div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: Calib=
ri, sans-serif;" class=3D"">
<span lang=3D"EN-IN" style=3D"font-size: 10pt; font-family: Tahoma, sans-se=
rif; color: rgb(31, 73, 125);" class=3D"">Hi,<o:p class=3D""></o:p></span><=
/div>
<div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: Calib=
ri, sans-serif;" class=3D"">
<span lang=3D"EN-IN" style=3D"font-size: 10pt; font-family: Tahoma, sans-se=
rif; color: rgb(31, 73, 125);" class=3D""><o:p class=3D"">&nbsp;</o:p></spa=
n></div>
<div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: Calib=
ri, sans-serif;" class=3D"">
<span lang=3D"EN-IN" style=3D"font-size: 10pt; font-family: Tahoma, sans-se=
rif; color: rgb(31, 73, 125);" class=3D"">Request a slot to discuss</span><=
b class=3D""><span lang=3D"EN-IN" style=3D"font-size: 11.5pt; font-family: =
&quot;PT Serif&quot;; color: rgb(34, 34, 34);" class=3D""><span class=3D"Ap=
ple-converted-space">&nbsp;</span></span></b><span lang=3D"EN-IN" style=3D"=
font-size: 10pt; font-family: Tahoma, sans-serif; color: rgb(31, 73, 125);"=
 class=3D"">Network
 Automatic Optimization Based on Dynamic Adjustment of IGP Metrics:<o:p cla=
ss=3D""></o:p></span></div>
<div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: Calib=
ri, sans-serif;" class=3D"">
<span lang=3D"EN-IN" style=3D"font-size: 10pt; font-family: Tahoma, sans-se=
rif; color: rgb(31, 73, 125);" class=3D""><o:p class=3D"">&nbsp;</o:p></spa=
n></div>
<div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: Calib=
ri, sans-serif;" class=3D"">
<span lang=3D"EN-IN" style=3D"font-size: 10pt; font-family: Tahoma, sans-se=
rif; color: rgb(31, 73, 125);" class=3D"">Drafts:<o:p class=3D""></o:p></sp=
an></div>
<div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: Calib=
ri, sans-serif;" class=3D"">
<span lang=3D"EN-US" class=3D""><a href=3D"https://datatracker.ietf.org/doc=
/draft-hu-lsr-network-automatic-optimization/" style=3D"color: rgb(149, 79,=
 114); text-decoration: underline;" class=3D"">https://datatracker.ietf.org=
/doc/draft-hu-lsr-network-automatic-optimization/</a><o:p class=3D""></o:p>=
</span></div>
<div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: Calib=
ri, sans-serif;" class=3D"">
<span lang=3D"EN-IN" style=3D"font-size: 10pt; font-family: Tahoma, sans-se=
rif; color: rgb(31, 73, 125);" class=3D"">Presenter: ZhiBo Hu<o:p class=3D"=
"></o:p></span></div>
<div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: Calib=
ri, sans-serif;" class=3D"">
<span lang=3D"EN-IN" style=3D"font-size: 10pt; font-family: Tahoma, sans-se=
rif; color: rgb(31, 73, 125);" class=3D""><o:p class=3D"">&nbsp;</o:p></spa=
n></div>
<div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: Calib=
ri, sans-serif;" class=3D"">
<span lang=3D"EN-IN" style=3D"font-size: 10pt; font-family: Tahoma, sans-se=
rif; color: rgb(31, 73, 125);" class=3D"">Duration: 15 mins<o:p class=3D"">=
</o:p></span></div>
<div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: Calib=
ri, sans-serif;" class=3D"">
<span lang=3D"EN-IN" style=3D"font-size: 10pt; font-family: Tahoma, sans-se=
rif; color: rgb(31, 73, 125);" class=3D""><o:p class=3D"">&nbsp;</o:p></spa=
n></div>
<div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: Calib=
ri, sans-serif;" class=3D"">
<span lang=3D"EN-IN" style=3D"font-size: 10pt; font-family: Tahoma, sans-se=
rif; color: rgb(31, 73, 125);" class=3D"">Thanks!<o:p class=3D""></o:p></sp=
an></div>
<div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: Calib=
ri, sans-serif;" class=3D"">
<span lang=3D"EN-IN" style=3D"font-size: 10pt; font-family: Tahoma, sans-se=
rif; color: rgb(31, 73, 125);" class=3D"">ZHiBo<o:p class=3D""></o:p></span=
></div>
<div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: Calib=
ri, sans-serif;" class=3D"">
<span lang=3D"EN-US" style=3D"font-size: 10.5pt; color: rgb(31, 73, 125);" =
class=3D""><o:p class=3D"">&nbsp;</o:p></span></div>
<div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: Calib=
ri, sans-serif;" class=3D"">
<span lang=3D"EN-US" style=3D"font-size: 10.5pt; color: rgb(31, 73, 125);" =
class=3D""><o:p class=3D"">&nbsp;</o:p></span></div>
<div class=3D"">
<div style=3D"border-style: solid none none; border-top-width: 1pt; border-=
top-color: rgb(225, 225, 225); padding: 3pt 0cm 0cm;" class=3D"">
<div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: Calib=
ri, sans-serif;" class=3D"">
<b class=3D""><span lang=3D"EN-US" style=3D"font-size: 11pt;" class=3D"">Fr=
om:</span></b><span lang=3D"EN-US" style=3D"font-size: 11pt;" class=3D""><s=
pan class=3D"Apple-converted-space">&nbsp;</span>Lsr [<a href=3D"mailto:lsr=
-bounces@ietf.org" style=3D"color: rgb(149, 79, 114); text-decoration: unde=
rline;" class=3D"">mailto:lsr-bounces@ietf.org</a>]<span class=3D"Apple-con=
verted-space">&nbsp;</span><b class=3D"">On
 Behalf Of<span class=3D"Apple-converted-space">&nbsp;</span></b>Acee Linde=
m (acee)<br class=3D"">
<b class=3D"">Sent:</b><span class=3D"Apple-converted-space">&nbsp;</span>M=
onday, June 18, 2018 9:45 PM<br class=3D"">
<b class=3D"">To:</b><span class=3D"Apple-converted-space">&nbsp;</span><a =
href=3D"mailto:lsr@ietf.org" style=3D"color: rgb(149, 79, 114); text-decora=
tion: underline;" class=3D"">lsr@ietf.org</a><br class=3D"">
<b class=3D"">Subject:</b><span class=3D"Apple-converted-space">&nbsp;</spa=
n>[Lsr] IETF 102 LSR Working Group Call for Agenda Items<o:p class=3D""></o=
:p></span></div>
</div>
</div>
<div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: Calib=
ri, sans-serif;" class=3D"">
<span lang=3D"EN-US" class=3D""><o:p class=3D"">&nbsp;</o:p></span></div>
<div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: Calib=
ri, sans-serif;" class=3D"">
<span lang=3D"EN-US" style=3D"font-size: 16pt;" class=3D"">Hi Folks,<o:p cl=
ass=3D""></o:p></span></div>
<div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: Calib=
ri, sans-serif;" class=3D"">
<span lang=3D"EN-US" style=3D"font-size: 16pt;" class=3D""><o:p class=3D"">=
&nbsp;</o:p></span></div>
<div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: Calib=
ri, sans-serif;" class=3D"">
<span lang=3D"EN-US" style=3D"font-size: 16pt;" class=3D"">The LSR (link-st=
ate-routing) WG will be meeting on Monday, July 16, 2018 from 9:30 to 12:00=
 (the first WG slot of IETF 102).<o:p class=3D""></o:p></span></div>
<div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: Calib=
ri, sans-serif;" class=3D"">
<span lang=3D"EN-US" style=3D"font-size: 16pt;" class=3D""><o:p class=3D"">=
&nbsp;</o:p></span></div>
<div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: Calib=
ri, sans-serif;" class=3D"">
<span lang=3D"EN-US" style=3D"font-size: 16pt;" class=3D"">Please send us (=
<a href=3D"mailto:lsr-chairs@ietf.org" style=3D"color: rgb(149, 79, 114); t=
ext-decoration: underline;" class=3D"">lsr-chairs@ietf.org</a>) any request=
s for presentation slots.<o:p class=3D""></o:p></span></div>
<div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: Calib=
ri, sans-serif;" class=3D"">
<span lang=3D"EN-US" style=3D"font-size: 16pt;" class=3D""><o:p class=3D"">=
&nbsp;</o:p></span></div>
<div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: Calib=
ri, sans-serif;" class=3D"">
<span lang=3D"EN-US" style=3D"font-size: 16pt;" class=3D"">Thanks,<o:p clas=
s=3D""></o:p></span></div>
<div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: Calib=
ri, sans-serif;" class=3D"">
<span lang=3D"EN-US" style=3D"font-size: 16pt;" class=3D"">Acee</span></div=
>
</div>
</div>
</blockquote>
</div>
<br class=3D"">
</div>
</body>
</html>

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From: "Acee Lindem (acee)" <acee@cisco.com>
To: Huzhibo <huzhibo@huawei.com>
CC: "lsr@ietf.org" <lsr@ietf.org>
Thread-Topic: [Lsr] IETF 102 LSR Working Group Call for Agenda Items
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--_000_BB6DC69C61874BDF8B882109D55F87CDciscocom_--


From nobody Fri Jul  6 09:22:55 2018
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Subject: [Lsr] Publication has been requested for draft-ietf-isis-reverse-metric-11
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Christian Hopps has requested publication of draft-ietf-isis-reverse-metric-11 as Proposed Standard on behalf of the LSR working group.

Please verify the document's state at https://datatracker.ietf.org/doc/draft-ietf-isis-reverse-metric/


From nobody Sat Jul  7 20:25:32 2018
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From: Randy Bush <randy@psg.com>
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robin,

i am not ignoring you.  i did not want to write unless i had something
possibly useful to say; and that requires pretending to think, always
difficult.

> I would also like to propose following draft for your reference which
> trigger us to move forward for better network maintenance with
> multiple tools in which gRPC/NETCOF and NMP/BMP may play different
> roles: https://datatracker.ietf.org/doc/draft-song-ntf/

[ warning: my memory is likely fuzzy, and the glass is dark ]

at an ietf in the late '90s[0], there was a hastily called meeting of
the snmp standards bearers and a bunch of operators.  the snmp folk were
shocked to learn that no operators used snmp for other than monitoring;
no one had snmp write enabled on devices; ops configured with the
cli[1].  from this was born netconf and the xml path.  credit where due:
phil eng was already well down this path at the time of that meeting.

but netconf/xml was a mechanism and lacked a model.  snmp had models,
whether we thought they were pretty or not.  thus yang was born, and ,
of course, a new generation wants to use the latest modern toys such as
restconf, openconfig, json, ...

draft-song-ntf yearns for an "architectural framework for network
telemetry," a lofty and worthwhile goal not, a priori, a bad one.  but a
few comments from a jaded old dog.

for a new paradigm to gain traction, it must be *significantly* better
than the old one, or the old paradigm must be clearly failing.  in the
story above, snmp was clearly failing, aside from using an unfashionable
encoding.  and yang clearly provided something needed and missing from
netconf.  note that this paradigm shift has taken over 20 years; and we
dis the itu et alia.

second, draft-song-ntf is an export-only model.  while telemetry is
extremely important, i will be very frustrated if i can only hear and
may not speak.  and the more it evolves to a really attractive paradigm
and model, the more annoyed i will be that i can not use it for control.

and lastly, to quote don knuth, "premature optimization is the root of
all evil."  do not get distracted by squeezing bits out of an encoding.
focus on things such as simple, clear, securable, extensible ...

randy

---

0 - i would love help pinning down which meeting

1 - i still have the "it's the cli, stupid" tee shirt.  an american
    political slogan of the era was "it's the economy, stupid."


From nobody Sun Jul  8 15:41:22 2018
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In-Reply-To: <DBE465DC-FEF0-474B-83BA-EBAA7CC71E75@cisco.com>
From: Jeff Tantsura <jefftant.ietf@gmail.com>
Date: Sun, 8 Jul 2018 18:04:50 -0700
Message-ID: <CAFAzdPUB_iz+5=hHM2tgrxz=BFUqqbhKAYypnXZrhVPHPo9MBA@mail.gmail.com>
To: "Einar Nilsen-Nygaard (einarnn)" <einarnn@cisco.com>
Cc: "Acee Lindem (acee)" <acee=40cisco.com@dmarc.ietf.org>, Lizhenbin <lizhenbin@huawei.com>,  "grow@ietf.org" <grow@ietf.org>, "lsr@ietf.org" <lsr@ietf.org>, "opsawg@ietf.org" <opsawg@ietf.org>, "rtgwg@ietf.org" <rtgwg@ietf.org>
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Subject: Re: [Lsr] [OPSAWG] [GROW] FW: New Version Notification for draft-gu-network-mornitoring-protol-00.txt
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Robin,

Einar pointed exactly right points, very little to add.
Let=E2=80=99s keep is-is (narrow) scope.
1. There=E2=80=99s operational state of the protocol - I don=E2=80=99t real=
ly see what=E2=80=99s
missing in IETF/OpenConfig YANG models that would nessesarily require new
work?
Please be specific in your answers

2. What=E2=80=99s in LSDB - to my understanding you are not looking at that=
?
Reading your draft - it only concerns operational state,  not the content,
so BMP is not really a comparable solution either...

Wrt gRPC and some other work being done by OpenConfig/open source community
- besides Einar=E2=80=99s points - we have got great working relationship w=
ith the
team working on these technologies, there are gRPC and gNMI drafts in RTGWG
that would be updated when the need arise.
Wrt performance - there=E2=80=99s significant amount of research/testing an=
d
comparisons of gRPC vs most of other RPC solutions, at scale, we in
networking won=E2=80=99t reach in quite some time, I=E2=80=99d advice to lo=
ok it up. We
could discuss other advantages of running on top of HTTPv2 separately.

Please note - I=E2=80=99m not judging your proposal, but trying to understa=
nd why,
we as the community should be spending time and effort on it, so far you
you didn=E2=80=99t manage to convince me.

Looking forward to your reply.

Thanks,
Jeff

On Thu, Jul 5, 2018 at 04:45 Einar Nilsen-Nygaard (einarnn) <
einarnn@cisco.com> wrote:

> Robin,
>
> With respect to your points below:
>
>
>    - #1 =E2=80=93 The draft ISIS model doesn=E2=80=99t seem to have many =
lateral
>    dependencies as far as I can see. And if it is incomplete from the
>    perspective of monitoring the health of ISIS, then it should be extend=
ed.
>    I=E2=80=99m not sure why it would be difficult to stabilise the defini=
tion?
>    - #2 =E2=80=93 This seems to be the same issue of an incomplete model.=
 Can you
>    clearly articulate any data that you think should be available that *c=
annot
>    be modelled in YANG*?
>    - #3 =E2=80=93 Agreed that exporting high volume, low latency telemetr=
y one
>    the baseline transport suggested in ietf-netconf-yang-push would
>    perhaps have issues. This is one of the reasons why transport extensib=
ility
>    is an explicit part of the draft.
>    - #4 =E2=80=93 IMO, as long as the encoding for data is clearly define=
d in an
>    "open" way, then this is not really an issue yet. I still think we nee=
d to
>    experiment with encodings, but I do not think an entirely new protocol=
 will
>    serve network operators.
>
>
> I=E2=80=99d also like to add to the last point and say that I do not thin=
k adding
> new protocols and new encodings will serve network operators well. Over t=
he
> last few years operators have been making it clear that they want to
> simplify their interactions with the network, and not have more things th=
ey
> need to understand thrown at them. Acee isn=E2=80=99t suggesting deprecat=
ing BMP,
> and neither am I, but in at least two discussions with operators I have
> attended, when introduced to BMP, their initial reaction could be
> summarised as "this looks interesting, but why have you introduced
> *another* protocol for this?"
>
> I completely support identifying the use cases you have, but would really
> like to see us focus on rectifying any deficiencies we can identify with
> existing proposals, rather than dilute our efforts.
>
> Cheers,
>
> Einar
>
> On 5 Jul 2018, at 11:48, Lizhenbin <lizhenbin@huawei.com> wrote:
>
> Hi Jeff,
> Before we propose the NMP idea, we carefully compared it with the existin=
g
> NETCONF, gRPC and YANG models work:
> 1. Based on my experience in the YANG model work, it may be not
> satisfactory for these models does not define config/oper of all features
> of specific protocol and these models have much relation with each other
> and it is difficult to stabilize the definition.
> 2. For monitoring the control protocol, it is not enough based on the
> existing YANG models such as the packets of control protocol which should
> be monitored but not defined in YANG models.
> 3. Performance concern on the existing NETCONF.
> 4. Standardization of the existing gRPC.
>
> We would like to define the NMP based on the usecases. That is, a specifi=
c
> set of parameters exported by NMP can satisfy the purpose of a specific
> usecase. Thus the protocol can be deployed incrementally.
>
>
> Best Regards,
> Robin
>
>
>
> -----Original Message-----
> From: Jeff Tantsura [mailto:jefftant.ietf@gmail.com
> <jefftant.ietf@gmail.com>]
> Sent: Wednesday, July 04, 2018 5:15 AM
> To: Acee Lindem (acee) <acee=3D40cisco.com@dmarc.ietf.org>; Lizhenbin <
> lizhenbin@huawei.com>; grow@ietf.org; opsawg@ietf.org
> Cc: lsr@ietf.org; rtgwg@ietf.org; Guyunan (Yunan Gu, IP Technology
> Research Dept. NW) <guyunan@huawei.com>
> Subject: Re: [Lsr] [GROW] FW: New Version Notification for
> draft-gu-network-mornitoring-protol-00.txt
>
> Robin,
>
> Pretty much same comment as Acee - I'm not clear as to why...
> Protocol YANG models developed in the last years clearly provide much
> better and more scalable approach to what has been proposed in the draft,
> since we are talking is-is - look at notifications in
> draft-ietf-isis-yang-isis-cfg. How do you propose to corelate operational
> state to configuration?
>
> gRPC provides high performance RPC framework  to streaming the telemetry
> data that is structured, easy to consume and extend.
>
> I'm not going to go into technical discussion, however would appreciate
> your response as to why NMP (please do not restate the points in the
> section 4 of the draft, they are quite incorrect)
>
> Thanks!
>
> Cheers,
> Jeff
>
> =EF=BB=BFOn 7/3/18, 09:21, "Lsr on behalf of Acee Lindem (acee)" <
> lsr-bounces@ietf.org on behalf of acee=3D40cisco.com@dmarc.ietf.org> wrot=
e:
>
>    Hi Robin,
>    I'm not arguing to deprecate BMP. What I am arguing is that the fact
> that BMP was created 15 years ago doesn't necessarily mean we should crea=
te
> an analogous IMP for IS-IS given the current IETF OPS technologies and th=
e
> fact that faster link speeds and Moore's law facilitate deployment of the=
se
> new OPS technologies. Anyway, I looked at the agenda and I will definitel=
y
> attend GROW on Wednesday afternoon for the discussion.
>    Thanks,
>    Acee
>
>    =EF=BB=BFOn 7/3/18, 6:40 AM, "Lizhenbin" <lizhenbin@huawei.com> wrote:
>
>        Hi Acee,
>        Thank for your attention to the new draft. Please refer to my repl=
y
> inline.
>
>        Best Regards,
>        Robin
>
>
>
>        -----Original Message-----
>        From: OPSAWG [mailto:opsawg-bounces@ietf.org
> <opsawg-bounces@ietf.org>] On Behalf Of Acee Lindem (acee)
>        Sent: Monday, July 02, 2018 9:24 PM
>        To: Guyunan (Yunan Gu, IP Technology Research Dept. NW) <
> guyunan@huawei.com>; grow@ietf.org; opsawg@ietf.org
>        Subject: Re: [OPSAWG] [GROW] FW: New Version Notification for
> draft-gu-network-mornitoring-protol-00.txt
>
>        Hi Yunan, Shunwan, and Zhenbin,
>
>        What are the advantages of inventing a new protocol over just usin=
g
> YANG and NETCONF, RESTCONF, or gNMI?
>        [Robin] In the draft we simply mention the difference between NMP
> and protocols you mentioned for the management plane. Though there is may=
be
> some overlap between the two types of protocols, the protocols you
> mentioned is not enough for monitoring the control protocol. For example,
> would we like to use YANG and NETCONF, RESTCONF, or gNMI to export the
> packets of control protocols such as update message of BGP and/or ISIS PD=
U,
> etc. for the purpose of monitoring?
>
>
>        Operators and vendors are doing this anyway. A second alternative
> would be to listen passively in IS-IS (or OSPF for that matter). Why woul=
d
> anyone want this?
>        [Robin] In fact we tried the method you proposed. From our point o=
f
> view, the basic design principle should be that the monitoring entity
> should be decoupled from the monitored entity. This is to avoid following
> cases:
>        1. The failure of operation of the control protocol may affect the
> monitoring at the same time.
>        2. The limitation of the control protocol will also have effect on
> the monitoring. For example, for the method of listening passively, if
> there are multiple hops between the listener and the network devices, it
> has to set up a tunnel as the virtual link for direct connection. But the
> TCP-based monitoring protocol need not care about it.
>
>
>        As far as where it belongs, we have a rather full agenda in LSR so
> I don't think we want to devote time to it there at IETF 102.
>        [Robin] Though the WG the draft should belong to is not determined
> yet, we think the work belongs to OPS area and send the notice to GROW WG
> and OPSAWG. We also applied for the presentation in the two WGs. We shoul=
d
> have copied the notice to the related WGs of RTG area. So the LSR WG and
> RTGWG WG mailing list are added. More comments and suggestions are welcom=
e.
>
>        Thanks,
>        Acee
>
>
>
>        On 7/2/18, 8:20 AM, "GROW on behalf of Guyunan (Yunan Gu, IP
> Technology Research Dept. NW)" <grow-bounces@ietf.org on behalf of
> guyunan@huawei.com> wrote:
>
>            Dear GROW & OPSAWG WGs,
>
>            We have proposed a Network Monitoring Protocol (NMP) for the
> control plane OAM. NMP for ISIS is illustrated in this draft to showcase
> the benefit and operation of NMP. Yet, we haven't decided which WG it
> belongs to.
>
>
>            Comments and suggestions are very welcome!
>
>            Thank you!
>
>
>            Yunan Gu
>            Huawei Technologies Co. Ltd
>
>            -----Original Message-----
>            From: internet-drafts@ietf.org [mailto:internet-drafts@ietf.or=
g
> <internet-drafts@ietf.org>]
>            Sent: 2018=E5=B9=B47=E6=9C=882=E6=97=A5 20:07
>            To: Zhuangshunwan <zhuangshunwan@huawei.com>; Lizhenbin <
> lizhenbin@huawei.com>; Guyunan (Yunan Gu, IP Technology Research Dept.
> NW) <guyunan@huawei.com>
>            Subject: New Version Notification for
> draft-gu-network-mornitoring-protol-00.txt
>
>
>            A new version of I-D, draft-gu-network-mornitoring-protol-00.t=
xt
>            has been successfully submitted by Yunan Gu and posted to the
> IETF repository.
>
>            Name: draft-gu-network-mornitoring-protol
>            Revision: 00
>            Title: Network Monitoring Protocol (NMP)
>            Document date: 2018-07-02
>            Group: Individual Submission
>            Pages: 15
>            URL:
> https://www.ietf.org/internet-drafts/draft-gu-network-mornitoring-protol-=
00.txt
>            Status:
> https://datatracker.ietf.org/doc/draft-gu-network-mornitoring-protol/
>            Htmlized:
> https://tools.ietf.org/html/draft-gu-network-mornitoring-protol-00
>            Htmlized:
> https://datatracker.ietf.org/doc/html/draft-gu-network-mornitoring-protol
>
>
>            Abstract:
>               To enable automated network OAM (Operations, administration
> and
>               management), the availability of network protocol running
> status
>               information is a fundamental step.  In this document, a
> network
>               monitoring protocol (NMP) is proposed to provision the
> information
>               related to running status of IGP (Interior Gateway Protocol=
)
> and
>               other control protocols.  It can facilitate the network
>               troubleshooting of control protocols in a network domain.
> Typical
>               network issues are illustrated as the usecases of NMP for
> ISIS to
>               showcase the necessity of NMP.  Then the operations and the
> message
>               formats of NMP for ISIS are defined.  In this document ISIS
> is used
>               as the illustration protocol, and the case of OSPF and othe=
r
> control
>               protocols will be included in the future version.
>
>
>
>
>
>            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
>
>            _______________________________________________
>            GROW mailing list
>            GROW@ietf.org
>            https://www.ietf.org/mailman/listinfo/grow
>
>
>        _______________________________________________
>        OPSAWG mailing list
>        OPSAWG@ietf.org
>        https://www.ietf.org/mailman/listinfo/opsawg
>
>
>    _______________________________________________
>    Lsr mailing list
>    Lsr@ietf.org
>    https://www.ietf.org/mailman/listinfo/lsr
>
>
>
> _______________________________________________
> OPSAWG mailing list
> OPSAWG@ietf.org
> https://www.ietf.org/mailman/listinfo/opsawg
>
>
>

--00000000000058b58d0570869a78
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div><div dir=3D"auto">Robin,</div></div><div dir=3D"auto"><br></div><div d=
ir=3D"auto">Einar pointed exactly right points, very little to add.<br></di=
v><div dir=3D"auto">Let=E2=80=99s keep is-is (narrow) scope.</div><div dir=
=3D"auto">1. There=E2=80=99s operational state of the protocol - I don=E2=
=80=99t really see what=E2=80=99s missing in IETF/OpenConfig YANG models th=
at would nessesarily require new work?</div><div dir=3D"auto">Please be spe=
cific in your answers</div><div dir=3D"auto"><br></div><div dir=3D"auto">2.=
 What=E2=80=99s in LSDB - to my understanding you are not looking at that? =
Reading your draft - it only concerns operational state, =C2=A0not the cont=
ent, so BMP is not really a comparable solution either...</div><div dir=3D"=
auto"><br></div><div dir=3D"auto">Wrt gRPC and some other work being done b=
y OpenConfig/open source community - besides Einar=E2=80=99s points - we ha=
ve got great working relationship with the team working on these technologi=
es, there are gRPC and gNMI drafts in RTGWG that would be updated when the =
need arise.</div><div dir=3D"auto">Wrt performance - there=E2=80=99s signif=
icant amount of research/testing and comparisons of gRPC vs most of other R=
PC solutions, at scale, we in networking won=E2=80=99t reach in quite some =
time, I=E2=80=99d advice to look it up. We could discuss other advantages o=
f running on top of HTTPv2 separately.</div><div dir=3D"auto"><br></div><di=
v dir=3D"auto">Please note - I=E2=80=99m not judging your proposal, but try=
ing to understand why, we as the community should be spending time and effo=
rt on it, so far you you didn=E2=80=99t manage to convince me.</div><div di=
r=3D"auto"><br></div><div dir=3D"auto">Looking forward to your reply.</div>=
<div dir=3D"auto"><br></div><div dir=3D"auto">Thanks,</div><div dir=3D"auto=
">Jeff</div><div><br><div class=3D"gmail_quote"><div dir=3D"ltr">On Thu, Ju=
l 5, 2018 at 04:45 Einar Nilsen-Nygaard (einarnn) &lt;<a href=3D"mailto:ein=
arnn@cisco.com">einarnn@cisco.com</a>&gt; wrote:<br></div><blockquote class=
=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padd=
ing-left:1ex">



<div style=3D"word-wrap:break-word;line-break:after-white-space">
Robin,
<div><br>
</div>
<div>With respect to your points below:</div>
<div><br>
</div>
<div>
<ul class=3D"m_4298705959558982989MailOutline">
<li>#1 =E2=80=93 The draft ISIS model doesn=E2=80=99t seem to have many lat=
eral dependencies as far as I can see. And if it is incomplete from the per=
spective of monitoring the health of ISIS, then it should be extended. I=E2=
=80=99m not sure why it would be difficult to stabilise
 the definition?</li><li>#2 =E2=80=93 This seems to be the same issue of an=
 incomplete model. Can you clearly articulate any data that you think shoul=
d be available that
<b>cannot be=C2=A0modelled in YANG</b>?</li><li>#3 =E2=80=93 Agreed that ex=
porting high volume, low latency telemetry one the baseline transport sugge=
sted in=C2=A0<span style=3D"white-space:pre-wrap">ietf-netconf-yang-push wo=
uld perhaps have issues. This is one of the reasons
 why transport extensibility is an explicit part of the draft.</span></li><=
li><span style=3D"white-space:pre-wrap">#4 =E2=80=93 IMO, as long as the en=
coding for data is clearly defined in an &quot;open&quot; way, then this is=
 not really an issue yet. I still think we need to experiment with encoding=
s, but I
 do not think an entirely new protocol will serve network operators.</span>=
</li></ul>
<div><br>
</div>
<div>I=E2=80=99d also like to add to the last point and say that I do not t=
hink adding new protocols and new encodings will serve network operators we=
ll. Over the last few years operators have been making it clear that they w=
ant to simplify their interactions with
 the network, and not have more things they need to understand thrown at th=
em. Acee isn=E2=80=99t suggesting deprecating BMP, and neither am I, but in=
 at least two discussions with operators I have attended, when introduced t=
o BMP, their initial reaction could be summarised
 as &quot;this looks interesting, but why have you introduced <b>another</b=
>=C2=A0protocol for this?&quot;</div>
<div><br>
</div>
<div>I completely support identifying the use cases you have, but would rea=
lly like to see us focus on rectifying any deficiencies we can identify wit=
h existing proposals, rather than dilute our efforts.</div>
<div><br>
</div>
<div>
<div>Cheers,</div>
<div><br>
</div>
<div>Einar</div>
<div><br>
</div>
</div></div></div><div style=3D"word-wrap:break-word;line-break:after-white=
-space"><div>
<div>
<blockquote type=3D"cite">
<div>On 5 Jul 2018, at 11:48, Lizhenbin &lt;<a href=3D"mailto:lizhenbin@hua=
wei.com" target=3D"_blank">lizhenbin@huawei.com</a>&gt; wrote:</div>
<br class=3D"m_4298705959558982989Apple-interchange-newline">
<div>
<div>Hi Jeff,<br>
Before we propose the NMP idea, we carefully compared it with the existing =
NETCONF, gRPC and YANG models work:<br>
1. Based on my experience in the YANG model work, it may be not satisfactor=
y for these models does not define config/oper of all features of specific =
protocol and these models have much relation with each other and it is diff=
icult to stabilize the definition.<br>
2. For monitoring the control protocol, it is not enough based on the exist=
ing YANG models such as the packets of control protocol which should be mon=
itored but not defined in YANG models.
<br>
3. Performance concern on the existing NETCONF.<br>
4. Standardization of the existing gRPC.<br>
<br>
We would like to define the NMP based on the usecases. That is, a specific =
set of parameters exported by NMP can satisfy the purpose of a specific use=
case. Thus the protocol can be deployed incrementally.<br>
<br>
<br>
Best Regards,<br>
Robin<br>
<br>
<br>
<br>
-----Original Message-----<br>
From: Jeff Tantsura [<a href=3D"mailto:jefftant.ietf@gmail.com" target=3D"_=
blank">mailto:jefftant.ietf@gmail.com</a>]
<br>
Sent: Wednesday, July 04, 2018 5:15 AM<br>
To: Acee Lindem (acee) &lt;<a href=3D"mailto:acee=3D40cisco.com@dmarc.ietf.=
org" target=3D"_blank">acee=3D40cisco.com@dmarc.ietf.org</a>&gt;; Lizhenbin=
 &lt;<a href=3D"mailto:lizhenbin@huawei.com" target=3D"_blank">lizhenbin@hu=
awei.com</a>&gt;;
<a href=3D"mailto:grow@ietf.org" target=3D"_blank">grow@ietf.org</a>; <a hr=
ef=3D"mailto:opsawg@ietf.org" target=3D"_blank">
opsawg@ietf.org</a><br>
Cc: <a href=3D"mailto:lsr@ietf.org" target=3D"_blank">lsr@ietf.org</a>; <a =
href=3D"mailto:rtgwg@ietf.org" target=3D"_blank">
rtgwg@ietf.org</a>; Guyunan (Yunan Gu, IP Technology Research Dept. NW) &lt=
;<a href=3D"mailto:guyunan@huawei.com" target=3D"_blank">guyunan@huawei.com=
</a>&gt;<br>
Subject: Re: [Lsr] [GROW] FW: New Version Notification for draft-gu-network=
-mornitoring-protol-00.txt<br>
<br>
Robin,<br>
<br>
Pretty much same comment as Acee - I&#39;m not clear as to why...<br>
Protocol YANG models developed in the last years clearly provide much bette=
r and more scalable approach to what has been proposed in the draft, since =
we are talking is-is - look at notifications in draft-ietf-isis-yang-isis-c=
fg. How do you propose to corelate
 operational state to configuration?<br>
<br>
gRPC provides high performance RPC framework =C2=A0to streaming the telemet=
ry data that is structured, easy to consume and extend.
<br>
<br>
I&#39;m not going to go into technical discussion, however would appreciate=
 your response as to why NMP (please do not restate the points in the secti=
on 4 of the draft, they are quite incorrect)
<br>
<br>
Thanks!<br>
<br>
Cheers,<br>
Jeff<br>
<br>
=EF=BB=BFOn 7/3/18, 09:21, &quot;Lsr on behalf of Acee Lindem (acee)&quot; =
&lt;<a href=3D"mailto:lsr-bounces@ietf.org" target=3D"_blank">lsr-bounces@i=
etf.org</a> on behalf of
<a href=3D"mailto:acee=3D40cisco.com@dmarc.ietf.org" target=3D"_blank">acee=
=3D40cisco.com@dmarc.ietf.org</a>&gt; wrote:<br>
<br>
=C2=A0=C2=A0=C2=A0Hi Robin, <br>
=C2=A0=C2=A0=C2=A0I&#39;m not arguing to deprecate BMP. What I am arguing i=
s that the fact that BMP was created 15 years ago doesn&#39;t necessarily m=
ean we should create an analogous IMP for IS-IS given the current IETF OPS =
technologies and the fact that faster link speeds and Moore&#39;s
 law facilitate deployment of these new OPS technologies. Anyway, I looked =
at the agenda and I will definitely attend GROW on Wednesday afternoon for =
the discussion.
<br>
=C2=A0=C2=A0=C2=A0Thanks,<br>
=C2=A0=C2=A0=C2=A0Acee <br>
<br>
=C2=A0=C2=A0=C2=A0=EF=BB=BFOn 7/3/18, 6:40 AM, &quot;Lizhenbin&quot; &lt;<a=
 href=3D"mailto:lizhenbin@huawei.com" target=3D"_blank">lizhenbin@huawei.co=
m</a>&gt; wrote:<br>
<br>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0Hi Acee,<br>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0Thank for your attention to the n=
ew draft. Please refer to my reply inline.<br>
<br>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0Best Regards,<br>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0Robin<br>
<br>
<br>
<br>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0-----Original Message-----<br>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0From: OPSAWG [<a href=3D"mailto:o=
psawg-bounces@ietf.org" target=3D"_blank">mailto:opsawg-bounces@ietf.org</a=
>] On Behalf Of Acee Lindem (acee)<br>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0Sent: Monday, July 02, 2018 9:24 =
PM<br>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0To: Guyunan (Yunan Gu, IP Technol=
ogy Research Dept. NW) &lt;<a href=3D"mailto:guyunan@huawei.com" target=3D"=
_blank">guyunan@huawei.com</a>&gt;;
<a href=3D"mailto:grow@ietf.org" target=3D"_blank">grow@ietf.org</a>; <a hr=
ef=3D"mailto:opsawg@ietf.org" target=3D"_blank">
opsawg@ietf.org</a><br>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0Subject: Re: [OPSAWG] [GROW] FW: =
New Version Notification for draft-gu-network-mornitoring-protol-00.txt<br>
<br>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0Hi Yunan, Shunwan, and Zhenbin, <=
br>
<br>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0What are the advantages of invent=
ing a new protocol over just using YANG and NETCONF, RESTCONF, or gNMI?
<br>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0[Robin] In the draft we simply me=
ntion the difference between NMP and protocols you mentioned for the manage=
ment plane. Though there is maybe some overlap between the two types of pro=
tocols, the protocols you mentioned is not enough for monitoring the
 control protocol. For example, would we like to use YANG and NETCONF, REST=
CONF, or gNMI to export the packets of control protocols such as update mes=
sage of BGP and/or ISIS PDU, etc. for the purpose of monitoring?<br>
<br>
<br>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0Operators and vendors are doing t=
his anyway. A second alternative would be to listen passively in IS-IS (or =
OSPF for that matter). Why would anyone want this?
<br>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0[Robin] In fact we tried the meth=
od you proposed. From our point of view, the basic design principle should =
be that the monitoring entity should be decoupled from the monitored entity=
. This is to avoid following cases:<br>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A01. The failure of operation of th=
e control protocol may affect the monitoring at the same time.<br>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A02. The limitation of the control =
protocol will also have effect on the monitoring. For example, for the meth=
od of listening passively, if there are multiple hops between the listener =
and the network devices, it has to set up a tunnel as the virtual link
 for direct connection. But the TCP-based monitoring protocol need not care=
 about it.
<br>
<br>
<br>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0As far as where it belongs, we ha=
ve a rather full agenda in LSR so I don&#39;t think we want to devote time =
to it there at IETF 102. =C2=A0<br>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0[Robin] Though the WG the draft s=
hould belong to is not determined yet, we think the work belongs to OPS are=
a and send the notice to GROW WG and OPSAWG. We also applied for the presen=
tation in the two WGs. We should have copied the notice to the related
 WGs of RTG area. So the LSR WG and RTGWG WG mailing list are added. More c=
omments and suggestions are welcome.<br>
<br>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0Thanks,<br>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0Acee<br>
<br>
<br>
<br>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0On 7/2/18, 8:20 AM, &quot;GROW on=
 behalf of Guyunan (Yunan Gu, IP Technology Research Dept. NW)&quot; &lt;<a=
 href=3D"mailto:grow-bounces@ietf.org" target=3D"_blank">grow-bounces@ietf.=
org</a> on behalf of
<a href=3D"mailto:guyunan@huawei.com" target=3D"_blank">guyunan@huawei.com<=
/a>&gt; wrote:<br>
<br>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0Dear GROW=
 &amp; OPSAWG WGs,<br>
<br>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0We have p=
roposed a Network Monitoring Protocol (NMP) for the control plane OAM. NMP =
for ISIS is illustrated in this draft to showcase the benefit and operation=
 of NMP. Yet, we haven&#39;t decided which WG it belongs to.
<br>
<br>
<br>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0Comments =
and suggestions are very welcome! <br>
<br>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0Thank you=
!<br>
<br>
<br>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0Yunan Gu<=
br>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0Huawei Te=
chnologies Co. Ltd<br>
<br>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0-----Orig=
inal Message-----<br>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0From: <a =
href=3D"mailto:internet-drafts@ietf.org" target=3D"_blank">internet-drafts@=
ietf.org</a> [<a href=3D"mailto:internet-drafts@ietf.org" target=3D"_blank"=
>mailto:internet-drafts@ietf.org</a>]
<br>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0Sent: 201=
8=E5=B9=B47=E6=9C=882=E6=97=A5 20:07<br>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0To: Zhuan=
gshunwan &lt;<a href=3D"mailto:zhuangshunwan@huawei.com" target=3D"_blank">=
zhuangshunwan@huawei.com</a>&gt;; Lizhenbin &lt;<a href=3D"mailto:lizhenbin=
@huawei.com" target=3D"_blank">lizhenbin@huawei.com</a>&gt;; Guyunan (Yunan=
 Gu, IP Technology Research Dept. NW) &lt;<a href=3D"mailto:guyunan@huawei.=
com" target=3D"_blank">guyunan@huawei.com</a>&gt;<br>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0Subject: =
New Version Notification for draft-gu-network-mornitoring-protol-00.txt<br>
<br>
<br>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0A new ver=
sion of I-D, draft-gu-network-mornitoring-protol-00.txt<br>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0has been =
successfully submitted by Yunan Gu and posted to the IETF repository.<br>
<br>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0Name:<spa=
n class=3D"m_4298705959558982989Apple-tab-span" style=3D"white-space:pre-wr=
ap"> </span><span class=3D"m_4298705959558982989Apple-tab-span" style=3D"wh=
ite-space:pre-wrap"></span>draft-gu-network-mornitoring-protol<br>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0Revision:=
<span class=3D"m_4298705959558982989Apple-tab-span" style=3D"white-space:pr=
e-wrap"> </span>
00<br>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0Title:<sp=
an class=3D"m_4298705959558982989Apple-tab-span" style=3D"white-space:pre-w=
rap"> </span><span class=3D"m_4298705959558982989Apple-tab-span" style=3D"w=
hite-space:pre-wrap"></span>Network Monitoring Protocol (NMP)<br>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0Document =
date:<span class=3D"m_4298705959558982989Apple-tab-span" style=3D"white-spa=
ce:pre-wrap"> </span>
2018-07-02<br>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0Group:<sp=
an class=3D"m_4298705959558982989Apple-tab-span" style=3D"white-space:pre-w=
rap"> </span><span class=3D"m_4298705959558982989Apple-tab-span" style=3D"w=
hite-space:pre-wrap"></span>Individual Submission<br>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0Pages:<sp=
an class=3D"m_4298705959558982989Apple-tab-span" style=3D"white-space:pre-w=
rap"> </span><span class=3D"m_4298705959558982989Apple-tab-span" style=3D"w=
hite-space:pre-wrap"></span>15<br>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0URL: =C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0<a href=3D"h=
ttps://www.ietf.org/internet-drafts/draft-gu-network-mornitoring-protol-00.=
txt" target=3D"_blank">https://www.ietf.org/internet-drafts/draft-gu-networ=
k-mornitoring-protol-00.txt</a><br>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0Status: =
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0<a href=3D"https://datatrac=
ker.ietf.org/doc/draft-gu-network-mornitoring-protol/" target=3D"_blank">ht=
tps://datatracker.ietf.org/doc/draft-gu-network-mornitoring-protol/</a><br>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0Htmlized:=
 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0<a href=3D"https://tools.ietf.org/html=
/draft-gu-network-mornitoring-protol-00" target=3D"_blank">https://tools.ie=
tf.org/html/draft-gu-network-mornitoring-protol-00</a><br>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0Htmlized:=
 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0<a href=3D"https://datatracker.ietf.or=
g/doc/html/draft-gu-network-mornitoring-protol" target=3D"_blank">https://d=
atatracker.ietf.org/doc/html/draft-gu-network-mornitoring-protol</a><br>
<br>
<br>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0Abstract:=
<br>
=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=A0To enable automated network OAM (Operations, administration and<br=
>
=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=A0management), the availability of network protocol running status<b=
r>
=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=A0information is a fundamental step.=C2=A0 In this document, a netwo=
rk<br>
=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=A0monitoring protocol (NMP) is proposed to provision the information=
<br>
=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=A0related to running status of IGP (Interior Gateway Protocol) and<b=
r>
=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=A0other control protocols.=C2=A0 It can facilitate the network<br>
=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=A0troubleshooting of control protocols in a network domain.=C2=A0 Ty=
pical<br>
=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=A0network issues are illustrated as the usecases of NMP for ISIS to<=
br>
=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=A0showcase the necessity of NMP.=C2=A0 Then the operations and the m=
essage<br>
=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=A0formats of NMP for ISIS are defined.=C2=A0 In this document ISIS i=
s used<br>
=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=A0as the illustration protocol, and the case of OSPF and other contr=
ol<br>
=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=A0protocols will be included in the future version.<br>
<br>
<br>
<br>
<br>
<br>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0Please no=
te that it may take a couple of minutes from the time of submission until t=
he htmlized version and diff are available at
<a href=3D"http://tools.ietf.org" target=3D"_blank">tools.ietf.org</a>.<br>
<br>
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From: Greg Skinner <gregskinner0@icloud.com>
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Cc: GMO Crops <grow@ietf.org>, opsawg@ietf.org, lsr@ietf.org, rtgwg@ietf.org
To: Randy Bush <randy@psg.com>, lizhenbin@huawei.com
References: <624FB76E-1588-4D6E-8DD6-A666C77A9201@gmail.com> <5A5B4DE12C0DAC44AF501CD9A2B01A8D8F43FE44@dggemm512-mbx.china.huawei.com> <B8E2C2E6-BE62-4624-A2AD-E54647ED8EF1@cisco.com> <5A5B4DE12C0DAC44AF501CD9A2B01A8D8F4403E7@dggemm512-mbx.china.huawei.com> <m236wu8l40.wl-randy@psg.com>
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Subject: Re: [Lsr] [GROW] FW: New Version Notification for draft-gu-network-mornitoring-protol-00.txt
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	charset=utf-8

Randy,

Is the OPS-NM Configuration Management Requirements (ops-nm) Bof =
<https://www.ietf.org/proceedings/52/176.htm> from IETF 52 (10 December =
2001) the meeting you were thinking of?  There are also references to an =
IAB meeting in 2002 about the lack of use of SNMP for network =
configuration in SNMP compared with CLI, Netconf, Netflow =
<https://www.snmpcenter.com/snmp-versus-other-protocols/> that =
culminated in RFC 3535 <https://tools.ietf.org/html/rfc3535>.

Robin,

Regarding the draft in question, I generally agree with the concerns =
others have made that it doesn=E2=80=99t appear to provide anything that =
other technologies such as YANG provide.  Also, IMO, the draft needs =
considerable work to be more easily understood.  For example, there are =
many acronyms such as CSNP and PSNP that are not defined, and may be =
misunderstood by readers not familiar with ISIS.  In the packet format =
sections, there are several uncapitalized uses of =E2=80=98should=E2=80=99=
.  Do the authors consider these to be non-normative requirements?  =
There are also statements such as "Network OAM statistics show that a =
relatively large part of the network issues are caused by the =
disfunction of various routing protocols and MPLS signalings=E2=80=9D =
that are offered without citations.

Regards,
Greg

> On Jul 7, 2018, at 8:25 PM, Randy Bush <randy@psg.com> wrote:
>=20
> robin,
>=20
> i am not ignoring you.  i did not want to write unless i had something
> possibly useful to say; and that requires pretending to think, always
> difficult.
>=20
>> I would also like to propose following draft for your reference which
>> trigger us to move forward for better network maintenance with
>> multiple tools in which gRPC/NETCOF and NMP/BMP may play different
>> roles: https://datatracker.ietf.org/doc/draft-song-ntf/
>=20
> [ warning: my memory is likely fuzzy, and the glass is dark ]
>=20
> at an ietf in the late '90s[0], there was a hastily called meeting of
> the snmp standards bearers and a bunch of operators.  the snmp folk =
were
> shocked to learn that no operators used snmp for other than =
monitoring;
> no one had snmp write enabled on devices; ops configured with the
> cli[1].  from this was born netconf and the xml path.  credit where =
due:
> phil eng was already well down this path at the time of that meeting.
>=20
> but netconf/xml was a mechanism and lacked a model.  snmp had models,
> whether we thought they were pretty or not.  thus yang was born, and ,
> of course, a new generation wants to use the latest modern toys such =
as
> restconf, openconfig, json, ...
>=20
> draft-song-ntf yearns for an "architectural framework for network
> telemetry," a lofty and worthwhile goal not, a priori, a bad one.  but =
a
> few comments from a jaded old dog.
>=20
> for a new paradigm to gain traction, it must be *significantly* better
> than the old one, or the old paradigm must be clearly failing.  in the
> story above, snmp was clearly failing, aside from using an =
unfashionable
> encoding.  and yang clearly provided something needed and missing from
> netconf.  note that this paradigm shift has taken over 20 years; and =
we
> dis the itu et alia.
>=20
> second, draft-song-ntf is an export-only model.  while telemetry is
> extremely important, i will be very frustrated if i can only hear and
> may not speak.  and the more it evolves to a really attractive =
paradigm
> and model, the more annoyed i will be that i can not use it for =
control.
>=20
> and lastly, to quote don knuth, "premature optimization is the root of
> all evil."  do not get distracted by squeezing bits out of an =
encoding.
> focus on things such as simple, clear, securable, extensible ...
>=20
> randy
>=20
> ---
>=20
> 0 - i would love help pinning down which meeting
>=20
> 1 - i still have the "it's the cli, stupid" tee shirt.  an american
>    political slogan of the era was "it's the economy, stupid."
>=20


--Apple-Mail=_B2D33E9D-4BB6-4726-9C0D-4D3504EE01EE
Content-Transfer-Encoding: quoted-printable
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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" =
class=3D"">Randy,<div class=3D""><br class=3D""></div><div class=3D"">Is =
the&nbsp;<a href=3D"https://www.ietf.org/proceedings/52/176.htm" =
class=3D"">OPS-NM Configuration Management Requirements (ops-nm) =
Bof</a>&nbsp;from IETF 52 (10 December 2001) the meeting you were =
thinking of? &nbsp;There are also references to an IAB meeting in 2002 =
about the lack of use of SNMP for network configuration in&nbsp;<a =
href=3D"https://www.snmpcenter.com/snmp-versus-other-protocols/" =
class=3D"">SNMP compared with CLI, Netconf, Netflow</a>&nbsp;that =
culminated in&nbsp;<a href=3D"https://tools.ietf.org/html/rfc3535" =
class=3D"">RFC 3535</a>.<div class=3D""><br class=3D""></div><div =
class=3D"">Robin,</div><div class=3D""><br class=3D""></div><div =
class=3D"">Regarding the draft in question, I generally agree with the =
concerns others have made that it doesn=E2=80=99t appear to provide =
anything that other technologies such as YANG provide. &nbsp;Also, IMO, =
the draft needs considerable work to be more easily understood. =
&nbsp;For example, there are many acronyms such as CSNP and PSNP that =
are not defined, and may be misunderstood by readers not familiar with =
ISIS. &nbsp;In the packet format sections, there are several =
uncapitalized uses of =E2=80=98should=E2=80=99. &nbsp;Do the authors =
consider these to be non-normative requirements? &nbsp;There are also =
statements such as "Network OAM statistics show that a relatively large =
part of the network issues are caused by the disfunction of various =
routing protocols and MPLS signalings=E2=80=9D that are offered without =
citations.</div><div class=3D""><br class=3D""></div><div =
class=3D"">Regards,</div><div class=3D"">Greg</div><div class=3D""><br =
class=3D""><div><blockquote type=3D"cite" class=3D""><div class=3D"">On =
Jul 7, 2018, at 8:25 PM, Randy Bush &lt;<a href=3D"mailto:randy@psg.com" =
class=3D"">randy@psg.com</a>&gt; wrote:</div><br =
class=3D"Apple-interchange-newline"><div class=3D""><div =
class=3D"">robin,<br class=3D""><br class=3D"">i am not ignoring you. =
&nbsp;i did not want to write unless i had something<br =
class=3D"">possibly useful to say; and that requires pretending to =
think, always<br class=3D"">difficult.<br class=3D""><br =
class=3D""><blockquote type=3D"cite" class=3D"">I would also like to =
propose following draft for your reference which<br class=3D"">trigger =
us to move forward for better network maintenance with<br =
class=3D"">multiple tools in which gRPC/NETCOF and NMP/BMP may play =
different<br class=3D"">roles: <a =
href=3D"https://datatracker.ietf.org/doc/draft-song-ntf/" =
class=3D"">https://datatracker.ietf.org/doc/draft-song-ntf/</a><br =
class=3D""></blockquote><br class=3D"">[ warning: my memory is likely =
fuzzy, and the glass is dark ]<br class=3D""><br class=3D"">at an ietf =
in the late '90s[0], there was a hastily called meeting of<br =
class=3D"">the snmp standards bearers and a bunch of operators. =
&nbsp;the snmp folk were<br class=3D"">shocked to learn that no =
operators used snmp for other than monitoring;<br class=3D"">no one had =
snmp write enabled on devices; ops configured with the<br =
class=3D"">cli[1]. &nbsp;from this was born netconf and the xml path. =
&nbsp;credit where due:<br class=3D"">phil eng was already well down =
this path at the time of that meeting.<br class=3D""><br class=3D"">but =
netconf/xml was a mechanism and lacked a model. &nbsp;snmp had =
models,<br class=3D"">whether we thought they were pretty or not. =
&nbsp;thus yang was born, and ,<br class=3D"">of course, a new =
generation wants to use the latest modern toys such as<br =
class=3D"">restconf, openconfig, json, ...<br class=3D""><br =
class=3D"">draft-song-ntf yearns for an "architectural framework for =
network<br class=3D"">telemetry," a lofty and worthwhile goal not, a =
priori, a bad one. &nbsp;but a<br class=3D"">few comments from a jaded =
old dog.<br class=3D""><br class=3D"">for a new paradigm to gain =
traction, it must be *significantly* better<br class=3D"">than the old =
one, or the old paradigm must be clearly failing. &nbsp;in the<br =
class=3D"">story above, snmp was clearly failing, aside from using an =
unfashionable<br class=3D"">encoding. &nbsp;and yang clearly provided =
something needed and missing from<br class=3D"">netconf. &nbsp;note that =
this paradigm shift has taken over 20 years; and we<br class=3D"">dis =
the itu et alia.<br class=3D""><br class=3D"">second, draft-song-ntf is =
an export-only model. &nbsp;while telemetry is<br class=3D"">extremely =
important, i will be very frustrated if i can only hear and<br =
class=3D"">may not speak. &nbsp;and the more it evolves to a really =
attractive paradigm<br class=3D"">and model, the more annoyed i will be =
that i can not use it for control.<br class=3D""><br class=3D"">and =
lastly, to quote don knuth, "premature optimization is the root of<br =
class=3D"">all evil." &nbsp;do not get distracted by squeezing bits out =
of an encoding.<br class=3D"">focus on things such as simple, clear, =
securable, extensible ...<br class=3D""><br class=3D"">randy<br =
class=3D""><br class=3D"">---<br class=3D""><br class=3D"">0 - i would =
love help pinning down which meeting<br class=3D""><br class=3D"">1 - i =
still have the "it's the cli, stupid" tee shirt. &nbsp;an american<br =
class=3D""> &nbsp;&nbsp;&nbsp;political slogan of the era was "it's the =
economy, stupid."<br class=3D""><br =
class=3D""></div></div></blockquote></div><br =
class=3D""></div></div></body></html>=

--Apple-Mail=_B2D33E9D-4BB6-4726-9C0D-4D3504EE01EE--


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From: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
To: "Acee Lindem (acee)" <acee=40cisco.com@dmarc.ietf.org>, Huzhibo <huzhibo@huawei.com>, "lsr@ietf.org" <lsr@ietf.org>
CC: "Dailongfei (Larry, IP Research)" <larry.dai@huawei.com>, Lizhenbin <lizhenbin@huawei.com>, "zhuyq@gsta.com" <zhuyq@gsta.com>
Thread-Topic: Comments on draft-hu-lsr-isis-path-mtu
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Date: Mon, 9 Jul 2018 04:52:00 +0000
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Subject: [Lsr] Comments on draft-hu-lsr-isis-path-mtu
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From: Huzhibo <huzhibo@huawei.com>
To: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>, "Acee Lindem (acee)" <acee=40cisco.com@dmarc.ietf.org>, "lsr@ietf.org" <lsr@ietf.org>
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Thread-Topic: Comments on draft-hu-lsr-isis-path-mtu
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Hi Yingzhen,

thanks for your review.

As regards to first IDNITS warning, not sure about the first one, I took 
the section "Requirements Language" from RFC8395 as suggested by Loa. 
RFC2119 is only referenced there, that should not be a problem though.

I removed the reference to ISO10589.

thanks,
Peter

On 09/07/18 00:41 , Yingzhen Qu wrote:
> Dear authors,
>
> I have done shepherd review of draft-ietf-ospf-lls-id-04 as requested by
> LSR chairs. Iâ€™d like to thank all authors for their contributions on
> this document, also people who have reviewed this document and provided
> valuable comments and discussions.
>
> The document is well written and ready for publication.
>
> IDNITS check found a couple of nits:
>
>    Miscellaneous warnings:
>
>
> ----------------------------------------------------------------------------
>
>    ** The document contains RFC2119-like boilerplate, but doesn't seem to
>
>       mention RFC 2119.  The boilerplate contains a reference [BCP14],
> but that
>
>       reference does not seem to mention RFC 2119 either.
>
>    -- The document date (July 1, 2018) is 7 days in the past.  Is this
>
>       intentional?
>
>    Checking references for intended status: Proposed Standard
>
>
> ----------------------------------------------------------------------------
>
>       (See RFCs 3967 and 4897 for information about using normative
> references
>
>       to lower-maturity documents in RFCs)
>
>    == Unused Reference: 'ISO10589' is defined on line 200, but no explicit
>
>       reference was found in the text
>
>       '[ISO10589] International Organization for Standardization,
> "Intermed...'
>
>    -- Possible downref: Non-RFC (?) normative reference: ref. 'BCP14'
>
>    -- Possible downref: Non-RFC (?) normative reference: ref. 'ISO10589'
>
>       Summary: 1 error (**), 0 flaws (~~), 1 warning (==), 3 comments (--).
>
> --------------------------------------------------------------------------------
>
> Thanks,
>
> Yingzhen
>


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From: "Acee Lindem (acee)" <acee@cisco.com>
To: "Peter Psenak (ppsenak)" <ppsenak@cisco.com>, Yingzhen Qu <yingzhen.qu@huawei.com>, "draft-ietf-ospf-lls-interface-id@ietf.org" <draft-ietf-ospf-lls-interface-id@ietf.org>, "lsr-chairs@ietf.org" <lsr-chairs@ietf.org>
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Thread-Topic: draft-ietf-ospf-lls-interface-id-04 Shepherd review
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Subject: Re: [Lsr] draft-ietf-ospf-lls-interface-id-04 Shepherd review
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Subject: Re: [Lsr] draft-ietf-ospf-lls-interface-id-04 Shepherd review
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Hi Acee,

that is exactly what I have in the draft.

thanks,
Peter

On 09/07/18 13:36 , Acee Lindem (acee) wrote:
> Hi Peter,
>
> The new boiler plate for requirements language, with references to both RFC 2119 and RFC 8174, is:
>
>
> 1.1.  Requirements Language
>
>     The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
>     "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
>     "OPTIONAL" in this document are to be interpreted as described in BCP
>     14 [RFC2119] [RFC8174] when, and only when, they appear in all
>     capitals, as shown here.
>
>
> This should resolve the IDNITS warning.
>
> Thanks,
> Acee
>
> ï»¿On 7/9/18, 5:14 AM, "Peter Psenak (ppsenak)" <ppsenak@cisco.com> wrote:
>
>      Hi Yingzhen,
>
>      thanks for your review.
>
>      As regards to first IDNITS warning, not sure about the first one, I took
>      the section "Requirements Language" from RFC8395 as suggested by Loa.
>      RFC2119 is only referenced there, that should not be a problem though.
>
>      I removed the reference to ISO10589.
>
>      thanks,
>      Peter
>
>      On 09/07/18 00:41 , Yingzhen Qu wrote:
>      > Dear authors,
>      >
>      > I have done shepherd review of draft-ietf-ospf-lls-id-04 as requested by
>      > LSR chairs. Iâ€™d like to thank all authors for their contributions on
>      > this document, also people who have reviewed this document and provided
>      > valuable comments and discussions.
>      >
>      > The document is well written and ready for publication.
>      >
>      > IDNITS check found a couple of nits:
>      >
>      >    Miscellaneous warnings:
>      >
>      >
>      > ----------------------------------------------------------------------------
>      >
>      >    ** The document contains RFC2119-like boilerplate, but doesn't seem to
>      >
>      >       mention RFC 2119.  The boilerplate contains a reference [BCP14],
>      > but that
>      >
>      >       reference does not seem to mention RFC 2119 either.
>      >
>      >    -- The document date (July 1, 2018) is 7 days in the past.  Is this
>      >
>      >       intentional?
>      >
>      >    Checking references for intended status: Proposed Standard
>      >
>      >
>      > ----------------------------------------------------------------------------
>      >
>      >       (See RFCs 3967 and 4897 for information about using normative
>      > references
>      >
>      >       to lower-maturity documents in RFCs)
>      >
>      >    == Unused Reference: 'ISO10589' is defined on line 200, but no explicit
>      >
>      >       reference was found in the text
>      >
>      >       '[ISO10589] International Organization for Standardization,
>      > "Intermed...'
>      >
>      >    -- Possible downref: Non-RFC (?) normative reference: ref. 'BCP14'
>      >
>      >    -- Possible downref: Non-RFC (?) normative reference: ref. 'ISO10589'
>      >
>      >       Summary: 1 error (**), 0 flaws (~~), 1 warning (==), 3 comments (--).
>      >
>      > --------------------------------------------------------------------------------
>      >
>      > Thanks,
>      >
>      > Yingzhen
>      >
>
>
>


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To: "Peter Psenak (ppsenak)" <ppsenak@cisco.com>, Yingzhen Qu <yingzhen.qu@huawei.com>, "draft-ietf-ospf-lls-interface-id@ietf.org" <draft-ietf-ospf-lls-interface-id@ietf.org>, "lsr-chairs@ietf.org" <lsr-chairs@ietf.org>
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Subject: Re: [Lsr] draft-ietf-ospf-lls-interface-id-04 Shepherd review
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From nobody Mon Jul  9 07:13:13 2018
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To: "Acee Lindem (acee)" <acee=40cisco.com@dmarc.ietf.org>, "Peter Psenak (ppsenak)" <ppsenak@cisco.com>, Yingzhen Qu <yingzhen.qu@huawei.com>, "draft-ietf-ospf-lls-interface-id@ietf.org" <draft-ietf-ospf-lls-interface-id@ietf.org>, "lsr-chairs@ietf.org" <lsr-chairs@ietf.org>
Cc: "lsr@ietf.org" <lsr@ietf.org>
References: <6FD38147-EA21-4336-B436-1072BF449DE2@huawei.com> <5B43276F.2040405@cisco.com> <8A3E4F27-F540-424E-8617-2C986FD3DA00@cisco.com> <5B43545B.7070403@cisco.com> <13338F6E-0DFD-4D80-8719-1947514933B9@cisco.com>
From: Loa Andersson <loa@pi.nu>
Message-ID: <aaa8719c-00d3-3b50-86da-093fe334af31@pi.nu>
Date: Mon, 9 Jul 2018 16:13:07 +0200
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Subject: Re: [Lsr] draft-ietf-ospf-lls-interface-id-04 Shepherd review
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Folks,

I agree - no reason to delay!

There is one small difference between what is in the document and what 
is in the RFC I pointed to

The document has "...as described in [BCP 14] [RFC2119] [RFC8174]..."

While RFC has "...as described in BCP 14 [RFC2119] [RFC8174]..."

The reference list in the RFC do not have BCP 14 listed as a reference.
I don't know if this helps.

Acee

BCP 14 is both [RFC2119] and [RFC8174].

/Loa

On 2018-07-09 14:29, Acee Lindem (acee) wrote:
> Hi Peter,
> 
> Strange, I'd remove the reference to [BCP14] since RFC 8174 and BCP 14 are the same document. I'm going to request publication as this certainly isn't enough to delay for an update.
> 
> Thanks,
> Acee
> 
> ï»¿On 7/9/18, 8:26 AM, "Peter Psenak (ppsenak)" <ppsenak@cisco.com> wrote:
> 
>      Hi Acee,
>      
>      that is exactly what I have in the draft.
>      
>      thanks,
>      Peter
>      
>      On 09/07/18 13:36 , Acee Lindem (acee) wrote:
>      > Hi Peter,
>      >
>      > The new boiler plate for requirements language, with references to both RFC 2119 and RFC 8174, is:
>      >
>      >
>      > 1.1.  Requirements Language
>      >
>      >     The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
>      >     "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
>      >     "OPTIONAL" in this document are to be interpreted as described in BCP
>      >     14 [RFC2119] [RFC8174] when, and only when, they appear in all
>      >     capitals, as shown here.
>      >
>      >
>      > This should resolve the IDNITS warning.
>      >
>      > Thanks,
>      > Acee
>      >
>      > On 7/9/18, 5:14 AM, "Peter Psenak (ppsenak)" <ppsenak@cisco.com> wrote:
>      >
>      >      Hi Yingzhen,
>      >
>      >      thanks for your review.
>      >
>      >      As regards to first IDNITS warning, not sure about the first one, I took
>      >      the section "Requirements Language" from RFC8395 as suggested by Loa.
>      >      RFC2119 is only referenced there, that should not be a problem though.
>      >
>      >      I removed the reference to ISO10589.
>      >
>      >      thanks,
>      >      Peter
>      >
>      >      On 09/07/18 00:41 , Yingzhen Qu wrote:
>      >      > Dear authors,
>      >      >
>      >      > I have done shepherd review of draft-ietf-ospf-lls-id-04 as requested by
>      >      > LSR chairs. Iâ€™d like to thank all authors for their contributions on
>      >      > this document, also people who have reviewed this document and provided
>      >      > valuable comments and discussions.
>      >      >
>      >      > The document is well written and ready for publication.
>      >      >
>      >      > IDNITS check found a couple of nits:
>      >      >
>      >      >    Miscellaneous warnings:
>      >      >
>      >      >
>      >      > ----------------------------------------------------------------------------
>      >      >
>      >      >    ** The document contains RFC2119-like boilerplate, but doesn't seem to
>      >      >
>      >      >       mention RFC 2119.  The boilerplate contains a reference [BCP14],
>      >      > but that
>      >      >
>      >      >       reference does not seem to mention RFC 2119 either.
>      >      >
>      >      >    -- The document date (July 1, 2018) is 7 days in the past.  Is this
>      >      >
>      >      >       intentional?
>      >      >
>      >      >    Checking references for intended status: Proposed Standard
>      >      >
>      >      >
>      >      > ----------------------------------------------------------------------------
>      >      >
>      >      >       (See RFCs 3967 and 4897 for information about using normative
>      >      > references
>      >      >
>      >      >       to lower-maturity documents in RFCs)
>      >      >
>      >      >    == Unused Reference: 'ISO10589' is defined on line 200, but no explicit
>      >      >
>      >      >       reference was found in the text
>      >      >
>      >      >       '[ISO10589] International Organization for Standardization,
>      >      > "Intermed...'
>      >      >
>      >      >    -- Possible downref: Non-RFC (?) normative reference: ref. 'BCP14'
>      >      >
>      >      >    -- Possible downref: Non-RFC (?) normative reference: ref. 'ISO10589'
>      >      >
>      >      >       Summary: 1 error (**), 0 flaws (~~), 1 warning (==), 3 comments (--).
>      >      >
>      >      > --------------------------------------------------------------------------------
>      >      >
>      >      > Thanks,
>      >      >
>      >      > Yingzhen
>      >      >
>      >
>      >
>      >
>      
>      
> 
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr
> 

-- 


Loa Andersson                        email: loa@pi.nu
Senior MPLS Expert
Bronze Dragon Consulting             phone: +46 739 81 21 64


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From: "Acee Lindem (acee)" <acee@cisco.com>
To: Loa Andersson <loa@pi.nu>, "Peter Psenak (ppsenak)" <ppsenak@cisco.com>, Yingzhen Qu <yingzhen.qu@huawei.com>, "draft-ietf-ospf-lls-interface-id@ietf.org" <draft-ietf-ospf-lls-interface-id@ietf.org>, "lsr-chairs@ietf.org" <lsr-chairs@ietf.org>
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Thread-Topic: [Lsr] draft-ietf-ospf-lls-interface-id-04 Shepherd review
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Subject: Re: [Lsr] draft-ietf-ospf-lls-interface-id-04 Shepherd review
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Hi Loa,

thanks for pointing that out.
I'll fix it.

thanks,
Peter

On 09/07/18 16:13 , Loa Andersson wrote:
> Folks,
>
> I agree - no reason to delay!
>
> There is one small difference between what is in the document and what
> is in the RFC I pointed to
>
> The document has "...as described in [BCP 14] [RFC2119] [RFC8174]..."
>
> While RFC has "...as described in BCP 14 [RFC2119] [RFC8174]..."
>
> The reference list in the RFC do not have BCP 14 listed as a reference.
> I don't know if this helps.
>
> Acee
>
> BCP 14 is both [RFC2119] and [RFC8174].
>
> /Loa
>
> On 2018-07-09 14:29, Acee Lindem (acee) wrote:
>> Hi Peter,
>>
>> Strange, I'd remove the reference to [BCP14] since RFC 8174 and BCP 14
>> are the same document. I'm going to request publication as this
>> certainly isn't enough to delay for an update.
>>
>> Thanks,
>> Acee
>>
>> ï»¿On 7/9/18, 8:26 AM, "Peter Psenak (ppsenak)" <ppsenak@cisco.com> wrote:
>>
>>      Hi Acee,
>>      that is exactly what I have in the draft.
>>      thanks,
>>      Peter
>>      On 09/07/18 13:36 , Acee Lindem (acee) wrote:
>>      > Hi Peter,
>>      >
>>      > The new boiler plate for requirements language, with references
>> to both RFC 2119 and RFC 8174, is:
>>      >
>>      >
>>      > 1.1.  Requirements Language
>>      >
>>      >     The key words "MUST", "MUST NOT", "REQUIRED", "SHALL",
>> "SHALL NOT",
>>      >     "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED",
>> "MAY", and
>>      >     "OPTIONAL" in this document are to be interpreted as
>> described in BCP
>>      >     14 [RFC2119] [RFC8174] when, and only when, they appear in all
>>      >     capitals, as shown here.
>>      >
>>      >
>>      > This should resolve the IDNITS warning.
>>      >
>>      > Thanks,
>>      > Acee
>>      >
>>      > On 7/9/18, 5:14 AM, "Peter Psenak (ppsenak)"
>> <ppsenak@cisco.com> wrote:
>>      >
>>      >      Hi Yingzhen,
>>      >
>>      >      thanks for your review.
>>      >
>>      >      As regards to first IDNITS warning, not sure about the
>> first one, I took
>>      >      the section "Requirements Language" from RFC8395 as
>> suggested by Loa.
>>      >      RFC2119 is only referenced there, that should not be a
>> problem though.
>>      >
>>      >      I removed the reference to ISO10589.
>>      >
>>      >      thanks,
>>      >      Peter
>>      >
>>      >      On 09/07/18 00:41 , Yingzhen Qu wrote:
>>      >      > Dear authors,
>>      >      >
>>      >      > I have done shepherd review of draft-ietf-ospf-lls-id-04
>> as requested by
>>      >      > LSR chairs. Iâ€™d like to thank all authors for their
>> contributions on
>>      >      > this document, also people who have reviewed this
>> document and provided
>>      >      > valuable comments and discussions.
>>      >      >
>>      >      > The document is well written and ready for publication.
>>      >      >
>>      >      > IDNITS check found a couple of nits:
>>      >      >
>>      >      >    Miscellaneous warnings:
>>      >      >
>>      >      >
>>      >      >
>> ----------------------------------------------------------------------------
>>
>>      >      >
>>      >      >    ** The document contains RFC2119-like boilerplate,
>> but doesn't seem to
>>      >      >
>>      >      >       mention RFC 2119.  The boilerplate contains a
>> reference [BCP14],
>>      >      > but that
>>      >      >
>>      >      >       reference does not seem to mention RFC 2119 either.
>>      >      >
>>      >      >    -- The document date (July 1, 2018) is 7 days in the
>> past.  Is this
>>      >      >
>>      >      >       intentional?
>>      >      >
>>      >      >    Checking references for intended status: Proposed
>> Standard
>>      >      >
>>      >      >
>>      >      >
>> ----------------------------------------------------------------------------
>>
>>      >      >
>>      >      >       (See RFCs 3967 and 4897 for information about
>> using normative
>>      >      > references
>>      >      >
>>      >      >       to lower-maturity documents in RFCs)
>>      >      >
>>      >      >    == Unused Reference: 'ISO10589' is defined on line
>> 200, but no explicit
>>      >      >
>>      >      >       reference was found in the text
>>      >      >
>>      >      >       '[ISO10589] International Organization for
>> Standardization,
>>      >      > "Intermed...'
>>      >      >
>>      >      >    -- Possible downref: Non-RFC (?) normative reference:
>> ref. 'BCP14'
>>      >      >
>>      >      >    -- Possible downref: Non-RFC (?) normative reference:
>> ref. 'ISO10589'
>>      >      >
>>      >      >       Summary: 1 error (**), 0 flaws (~~), 1 warning
>> (==), 3 comments (--).
>>      >      >
>>      >      >
>> --------------------------------------------------------------------------------
>>
>>      >      >
>>      >      > Thanks,
>>      >      >
>>      >      > Yingzhen
>>      >      >
>>      >
>>      >
>>      >
>>
>> _______________________________________________
>> Lsr mailing list
>> Lsr@ietf.org
>> https://www.ietf.org/mailman/listinfo/lsr
>>
>


From nobody Mon Jul  9 09:13:54 2018
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Subject: [Lsr] Publication has been requested for draft-ietf-ospf-lls-interface-id-04
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Acee Lindem has requested publication of draft-ietf-ospf-lls-interface-id-04 as Proposed Standard on behalf of the LSR working group.

Please verify the document's state at https://datatracker.ietf.org/doc/draft-ietf-ospf-lls-interface-id/


From nobody Mon Jul  9 14:57:39 2018
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To: Randy Bush <randy@psg.com>, Lizhenbin <lizhenbin@huawei.com>
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Thread-Topic: [OPSAWG] [GROW] [Lsr] FW: New Version Notification for draft-gu-network-mornitoring-protol-00.txt
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Hi Randy,

Thank you for comments on draft-song-ntf.
I'm not sure I understand your second point. Could you please clarify it?
Please note we didn't enforce any specific model on the telemetry yet. This=
 doc only concerns the aspect on how to acquire data from networks. It does=
 support the dynamic and interactive configuration for data acquirement. Bu=
t control is out of scope of this document, although we confirm that teleme=
try plus control complete the closed control loop. Maybe I misunderstood yo=
ur point.
Thanks!

Haoyu

-----Original Message-----
From: OPSAWG [mailto:opsawg-bounces@ietf.org] On Behalf Of Randy Bush
Sent: Saturday, July 07, 2018 8:25 PM
To: Lizhenbin <lizhenbin@huawei.com>
Cc: lsr@ietf.org; GMO Crops <grow@ietf.org>; opsawg@ietf.org; rtgwg@ietf.or=
g
Subject: Re: [OPSAWG] [GROW] [Lsr] FW: New Version Notification for draft-g=
u-network-mornitoring-protol-00.txt

robin,

i am not ignoring you.  i did not want to write unless i had something poss=
ibly useful to say; and that requires pretending to think, always difficult=
.

> I would also like to propose following draft for your reference which=20
> trigger us to move forward for better network maintenance with=20
> multiple tools in which gRPC/NETCOF and NMP/BMP may play different
> roles: https://datatracker.ietf.org/doc/draft-song-ntf/

[ warning: my memory is likely fuzzy, and the glass is dark ]

at an ietf in the late '90s[0], there was a hastily called meeting of the s=
nmp standards bearers and a bunch of operators.  the snmp folk were shocked=
 to learn that no operators used snmp for other than monitoring; no one had=
 snmp write enabled on devices; ops configured with the cli[1].  from this =
was born netconf and the xml path.  credit where due:
phil eng was already well down this path at the time of that meeting.

but netconf/xml was a mechanism and lacked a model.  snmp had models, wheth=
er we thought they were pretty or not.  thus yang was born, and , of course=
, a new generation wants to use the latest modern toys such as restconf, op=
enconfig, json, ...

draft-song-ntf yearns for an "architectural framework for network telemetry=
," a lofty and worthwhile goal not, a priori, a bad one.  but a few comment=
s from a jaded old dog.

for a new paradigm to gain traction, it must be *significantly* better than=
 the old one, or the old paradigm must be clearly failing.  in the story ab=
ove, snmp was clearly failing, aside from using an unfashionable encoding. =
 and yang clearly provided something needed and missing from netconf.  note=
 that this paradigm shift has taken over 20 years; and we dis the itu et al=
ia.

second, draft-song-ntf is an export-only model.  while telemetry is extreme=
ly important, i will be very frustrated if i can only hear and may not spea=
k.  and the more it evolves to a really attractive paradigm and model, the =
more annoyed i will be that i can not use it for control.

and lastly, to quote don knuth, "premature optimization is the root of all =
evil."  do not get distracted by squeezing bits out of an encoding.
focus on things such as simple, clear, securable, extensible ...

randy

---

0 - i would love help pinning down which meeting

1 - i still have the "it's the cli, stupid" tee shirt.  an american
    political slogan of the era was "it's the economy, stupid."

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From: "Tim Evens (tievens)" <tievens@cisco.com>
To: Greg Skinner <gregskinner0=40icloud.com@dmarc.ietf.org>, Randy Bush <randy@psg.com>, "lizhenbin@huawei.com" <lizhenbin@huawei.com>
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Thread-Topic: [GROW] [Lsr] FW: New Version Notification for draft-gu-network-mornitoring-protol-00.txt
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Date: Wed, 11 Jul 2018 00:40:58 +0000
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Subject: Re: [Lsr] [GROW] FW: New Version Notification for draft-gu-network-mornitoring-protol-00.txt
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Tim,

I already suggested use of BGP-LS *as-is* in this thread on Jul 6th.

But I guess we all agree that this is not the best use of BGP protocol to
be now a vehicle of NMS only because it is easy with BGP to establish a TCP
session and to distribute "stuff" in a relatively loop free fashion.

Thx,
R.

On Wed, Jul 11, 2018 at 2:40 AM, Tim Evens (tievens) <
tievens=3D40cisco.com@dmarc.ietf.org> wrote:

> Hi Robin, Yunan, Shunwan,
>
>
>
> I'm a little late to this thread due to being preoccupied with a newborn.
>
>
>
> Below are my comments, which take into consideration the other comments=
=E2=80=A6
> sans the YANG/telemetry debate.  Considering we do use BGP-LS extensively=
,
> I don't think YANG is the only solution to these link-state monitoring
> use-cases.
>
>
>
> BMP doesn't change or limit what's available in BGP. It encapsulates and
> multiplexes BGP over a single stream for remote monitoring.   BGP-LS
> (RFC7752) can be used today to monitor link state protocols (ISIS, OSPF).
> BGP-LS also can be used to monitor EPE and direct/static routes, which is=
 a
> bit of a stretch on putting that in BGP-LS, but nonetheless=E2=80=A6  BGP=
-LS is
> available via BMP.
>
>
>
> "Section 3.1, ISIS Adjacency Issues"
>
>
>
> As written, this is covered by BGP-LS LINK NLRI.  We see a LINK change
> (advertised verses withdrawn) when the adjacency changes.  If the router
> dies or the control-plane fails in some way, we still see the NLRI change
> from the other side of the adjacency (perspective).
>
>
>
> What we are missing is a BGP-LS "attribute" tlv (on local entries) for
> links/nodes that indicates the REASON why the LINK (also NODE) is
> withdrawn, but.... this is not available without changing the IGP protoco=
l
> itself (e.g. new ISIS TLV) or by implementing a solution architecture tha=
t
> requires BGP-LS feeds from all ISIS/OSPF nodes.  As written, I see NMP
> (including Netconf/gNMI/telemetry) requiring sessions from all nodes sinc=
e
> the targeted data is not available in ISIS TLV's today.   For example, th=
e
> ISIS LSDB on node-A does not have any local (device specific) information
> from all the other nodes unless there are TLV's to convey that informatio=
n.
>
>
>
> Regarding requiring BGP-LS feeds from many or all nodes...  We need this
> regardless of this draft because of segment-routing/egress peer
> engineering.   Due to EPE, we already recommend BGP-LS peering (feeds) fr=
om
> all EPE nodes (normally via a peering server) so that we can
> collect/monitor EPE (hopefully using https://tools.ietf.org/html/
> draft-ietf-grow-bmp-local-rib-01). Adding LINK/NODE withdrawal/down
> reason should not overstep into YANG/Netconf/Telemetry.
>
>
>
> "3.2.  Forwarding Path Disconnection"
>
>
>
> This seems to be more of a fit for telemetry with interface/link
> monitoring.  Although, if the link was working at some point and it goes
> down due to MTU or otherwise, the BGP-LS REASON attribute should be able =
to
> convey that.  BGP-LS wouldn't convey anything if the link was never
> established.  Currently, it's assumed that the link advertisement means
> it's established.  This could be changed if we added a LINK NLRI state
> TLV.   The LINK could be updated (advertised) multiple times, changing
> based on state.   If the LINK doesn't establish, the withdrawal could
> indicate the reason.
>
>
>
> "3.3.  ISIS LSP Synchronization Failure"
>
>
>
> If a new BGP-LS LINK attribute is used as mentioned above to convey LINK
> adv state, it should then be feasible to add a state to indicate
> inconsistency. If the link/adj changes to down, then the withdrawal LINK
> reason attribute could indicate the cause.
>
>
>
> The BGP-LS reason and state tlv's would only apply to the links/nodes tha=
t
> originate from the BGP-LS speaker.  Other node/link advertisements would
> not have the attribute/tlv.   This is why the solution would recommend
> enabling BGP-LS feeds from nodes that matter enough to get this level of
> local info.  This btw would solve a problem we have with BGP-LS today whe=
re
> optional TLV's are not present unless ISIS/OSPF have specific features
> enabled, such as traffic-engineering... even IPv4/IPv6 router ID's are no=
t
> included unless enabled specifically (isis) per node.
>
>
>
> "4.  Extensions of NMP for ISIS"
>
>
>
> Most of the new messages are redundant to the existing BGP-LS
> advertisements and withdrawals.  Telemetry of course could also convey
> this=E2=80=A6
>
>
>
> The initiation message could lead to overloading it with all kinds of
> device specific info.   Some constraint is needed.
>
>
>
> The per peer (adjacency) header is missing multi-topology.  BGP-LS
> includes the protocol type (e.g. CT) and MT (missing from this draft).
>
>
>
> All in all, I believe the use-cases described have merit and I think we
> can do this with BGP-LS, which doesn't require BMP but could be used.
>
>
>
> Thanks,
>
> Tim
>
>
>
>
>
> On 7/8/18, 8:59 PM, "GROW on behalf of Greg Skinner" <
> grow-bounces@ietf.org on behalf of gregskinner0=3D40icloud.com@
> dmarc.ietf.org> wrote:
>
>
>
> Randy,
>
>
>
> Is the OPS-NM Configuration Management Requirements (ops-nm) Bof
> <https://www.ietf.org/proceedings/52/176.htm> from IETF 52 (10 December
> 2001) the meeting you were thinking of?  There are also references to an
> IAB meeting in 2002 about the lack of use of SNMP for network configurati=
on
> in SNMP compared with CLI, Netconf, Netflow
> <https://www.snmpcenter.com/snmp-versus-other-protocols/> that culminated
> in RFC 3535 <https://tools.ietf.org/html/rfc3535>.
>
>
>
> Robin,
>
>
>
> Regarding the draft in question, I generally agree with the concerns
> others have made that it doesn=E2=80=99t appear to provide anything that =
other
> technologies such as YANG provide.  Also, IMO, the draft needs considerab=
le
> work to be more easily understood.  For example, there are many acronyms
> such as CSNP and PSNP that are not defined, and may be misunderstood by
> readers not familiar with ISIS.  In the packet format sections, there are
> several uncapitalized uses of =E2=80=98should=E2=80=99.  Do the authors c=
onsider these to
> be non-normative requirements?  There are also statements such as "Networ=
k
> OAM statistics show that a relatively large part of the network issues ar=
e
> caused by the disfunction of various routing protocols and MPLS signaling=
s=E2=80=9D
> that are offered without citations.
>
>
>
> Regards,
>
> Greg
>
>
>
> On Jul 7, 2018, at 8:25 PM, Randy Bush <randy@psg.com> wrote:
>
>
>
> robin,
>
> i am not ignoring you.  i did not want to write unless i had something
> possibly useful to say; and that requires pretending to think, always
> difficult.
>
>
> I would also like to propose following draft for your reference which
> trigger us to move forward for better network maintenance with
> multiple tools in which gRPC/NETCOF and NMP/BMP may play different
> roles: https://datatracker.ietf.org/doc/draft-song-ntf/
>
>
> [ warning: my memory is likely fuzzy, and the glass is dark ]
>
> at an ietf in the late '90s[0], there was a hastily called meeting of
> the snmp standards bearers and a bunch of operators.  the snmp folk were
> shocked to learn that no operators used snmp for other than monitoring;
> no one had snmp write enabled on devices; ops configured with the
> cli[1].  from this was born netconf and the xml path.  credit where due:
> phil eng was already well down this path at the time of that meeting.
>
> but netconf/xml was a mechanism and lacked a model.  snmp had models,
> whether we thought they were pretty or not.  thus yang was born, and ,
> of course, a new generation wants to use the latest modern toys such as
> restconf, openconfig, json, ...
>
> draft-song-ntf yearns for an "architectural framework for network
> telemetry," a lofty and worthwhile goal not, a priori, a bad one.  but a
> few comments from a jaded old dog.
>
> for a new paradigm to gain traction, it must be *significantly* better
> than the old one, or the old paradigm must be clearly failing.  in the
> story above, snmp was clearly failing, aside from using an unfashionable
> encoding.  and yang clearly provided something needed and missing from
> netconf.  note that this paradigm shift has taken over 20 years; and we
> dis the itu et alia.
>
> second, draft-song-ntf is an export-only model.  while telemetry is
> extremely important, i will be very frustrated if i can only hear and
> may not speak.  and the more it evolves to a really attractive paradigm
> and model, the more annoyed i will be that i can not use it for control.
>
> and lastly, to quote don knuth, "premature optimization is the root of
> all evil."  do not get distracted by squeezing bits out of an encoding.
> focus on things such as simple, clear, securable, extensible ...
>
> randy
>
> ---
>
> 0 - i would love help pinning down which meeting
>
> 1 - i still have the "it's the cli, stupid" tee shirt.  an american
>    political slogan of the era was "it's the economy, stupid."
>
>
>
> _______________________________________________
> GROW mailing list
> GROW@ietf.org
> https://www.ietf.org/mailman/listinfo/grow
>
>

--000000000000baff480570b5d146
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-family:arial,he=
lvetica,sans-serif;font-size:small">Tim,</div><div class=3D"gmail_default" =
style=3D"font-family:arial,helvetica,sans-serif;font-size:small"><br></div>=
<div class=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-seri=
f;font-size:small">I already suggested use of BGP-LS *as-is* in this thread=
 on Jul 6th.=C2=A0</div><div class=3D"gmail_default" style=3D"font-family:a=
rial,helvetica,sans-serif;font-size:small"><br></div><div class=3D"gmail_de=
fault" style=3D"font-family:arial,helvetica,sans-serif;font-size:small">But=
 I guess we all agree that this is not the best use of BGP protocol to be n=
ow a vehicle of NMS only because it is easy with BGP to establish a TCP ses=
sion and to distribute &quot;stuff&quot; in a relatively loop free fashion.=
=C2=A0</div><div class=3D"gmail_default" style=3D"font-family:arial,helveti=
ca,sans-serif;font-size:small"><br></div><div class=3D"gmail_default" style=
=3D"font-family:arial,helvetica,sans-serif;font-size:small">Thx,<br>R.</div=
></div><div class=3D"gmail_extra"><br><div class=3D"gmail_quote">On Wed, Ju=
l 11, 2018 at 2:40 AM, Tim Evens (tievens) <span dir=3D"ltr">&lt;<a href=3D=
"mailto:tievens=3D40cisco.com@dmarc.ietf.org" target=3D"_blank">tievens=3D4=
0cisco.com@dmarc.ietf.org</a>&gt;</span> wrote:<br><blockquote class=3D"gma=
il_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-lef=
t:1ex">





<div lang=3D"EN-US" link=3D"blue" vlink=3D"purple">
<div class=3D"m_6213673854627750197WordSection1">
<p class=3D"MsoNormal">Hi Robin, Yunan, Shunwan,<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">I&#39;m a little late to this thread due to being pr=
eoccupied with a newborn.=C2=A0
<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">Below are my comments, which take into consideration=
 the other comments=E2=80=A6 sans the YANG/telemetry debate.=C2=A0 Consider=
ing we do use BGP-LS extensively, I don&#39;t think YANG is the only soluti=
on to these link-state monitoring use-cases.
<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">BMP doesn&#39;t change or limit what&#39;s available=
 in BGP. It encapsulates and multiplexes BGP over a single stream for remot=
e monitoring.=C2=A0=C2=A0 BGP-LS (RFC7752) can be used today to monitor lin=
k state protocols (ISIS, OSPF).=C2=A0 BGP-LS also can be
 used to monitor EPE and direct/static routes, which is a bit of a stretch =
on putting that in BGP-LS, but nonetheless=E2=80=A6 =C2=A0BGP-LS is availab=
le via BMP.
<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">&quot;Section 3.1, ISIS Adjacency Issues&quot;<u></u=
><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">As written, this is covered by BGP-LS LINK NLRI.=C2=
=A0 We see a LINK change (advertised verses withdrawn) when the adjacency c=
hanges.=C2=A0 If the router dies or the control-plane fails in some way, we=
 still see the NLRI change from the other side
 of the adjacency (perspective).=C2=A0=C2=A0 <u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">What we are missing is a BGP-LS &quot;attribute&quot=
; tlv (on local entries) for links/nodes that indicates the REASON why the =
LINK (also NODE) is withdrawn, but.... this is not available without changi=
ng the IGP protocol itself (e.g. new ISIS TLV)
 or by implementing a solution architecture that requires BGP-LS feeds from=
 all ISIS/OSPF nodes.=C2=A0 As written, I see NMP (including Netconf/gNMI/t=
elemetry) requiring sessions from all nodes since the targeted data is not =
available in ISIS TLV&#39;s today.=C2=A0 =C2=A0For
 example, the ISIS LSDB on node-A does not have any local (device specific)=
 information from all the other nodes unless there are TLV&#39;s to convey =
that information.<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">Regarding requiring BGP-LS feeds from many or all no=
des...=C2=A0 We need this regardless of this draft because of segment-routi=
ng/egress peer engineering.=C2=A0=C2=A0 Due to EPE, we already recommend BG=
P-LS peering (feeds) from all EPE nodes (normally
 via a peering server) so that we can collect/monitor EPE (hopefully using =
<a href=3D"https://tools.ietf.org/html/draft-ietf-grow-bmp-local-rib-01" ta=
rget=3D"_blank">https://tools.ietf.org/html/<wbr>draft-ietf-grow-bmp-local-=
rib-<wbr>01</a>). Adding LINK/NODE withdrawal/down reason should not overst=
ep into YANG/Netconf/Telemetry.=C2=A0=C2=A0
<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">&quot;3.2.=C2=A0 Forwarding Path Disconnection&quot;=
 <u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">This seems to be more of a fit for telemetry with in=
terface/link monitoring.=C2=A0 Although, if the link was working at some po=
int and it goes down due to MTU or otherwise, the BGP-LS REASON attribute s=
hould be able to convey that.=C2=A0 BGP-LS wouldn&#39;t
 convey anything if the link was never established.=C2=A0 Currently, it&#39=
;s assumed that the link advertisement means it&#39;s established.=C2=A0 Th=
is could be changed if we added a LINK NLRI state TLV.=C2=A0 =C2=A0The LINK=
 could be updated (advertised) multiple times, changing based
 on state. =C2=A0=C2=A0If the LINK doesn&#39;t establish, the withdrawal co=
uld indicate the reason. =C2=A0<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">&quot;3.3.=C2=A0 ISIS LSP Synchronization Failure&qu=
ot;<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">If a new BGP-LS LINK attribute is used as mentioned =
above to convey LINK adv state, it should then be feasible to add a state t=
o indicate inconsistency. If the link/adj changes to down, then the withdra=
wal LINK reason attribute could indicate
 the cause.<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">The BGP-LS reason and state tlv&#39;s would only app=
ly to the links/nodes that originate from the BGP-LS speaker.=C2=A0 Other n=
ode/link advertisements would not have the attribute/tlv.=C2=A0=C2=A0 This =
is why the solution would recommend enabling BGP-LS feeds
 from nodes that matter enough to get this level of local info.=C2=A0 This =
btw would solve a problem we have with BGP-LS today where optional TLV&#39;=
s are not present unless ISIS/OSPF have specific features enabled, such as =
traffic-engineering... even IPv4/IPv6 router
 ID&#39;s are not included unless enabled specifically (isis) per node.=C2=
=A0 <u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">&quot;4.=C2=A0 Extensions of NMP for ISIS&quot; <u><=
/u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">Most of the new messages are redundant to the existi=
ng BGP-LS advertisements and withdrawals.=C2=A0 Telemetry of course could a=
lso convey this=E2=80=A6
<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">The initiation message could lead to overloading it =
with all kinds of device specific info.=C2=A0 =C2=A0Some constraint is need=
ed.<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">The per peer (adjacency) header is missing multi-top=
ology.=C2=A0 BGP-LS includes the protocol type (e.g. CT) and MT (missing fr=
om this draft).
<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">All in all, I believe the use-cases described have m=
erit and I think we can do this with BGP-LS, which doesn&#39;t require BMP =
but could be used.
<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">Thanks,<u></u><u></u></p>
<p class=3D"MsoNormal">Tim<u></u><u></u></p><div><div class=3D"h5">
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">On 7/8/18, 8:59 PM, &quot=
;GROW on behalf of Greg Skinner&quot; &lt;<a href=3D"mailto:grow-bounces@ie=
tf.org" target=3D"_blank">grow-bounces@ietf.org</a> on behalf of
<a href=3D"mailto:gregskinner0=3D40icloud.com@dmarc.ietf.org" target=3D"_bl=
ank">gregskinner0=3D40icloud.com@<wbr>dmarc.ietf.org</a>&gt; wrote:<u></u><=
u></u></p>
</div>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><u></u>=C2=A0<u></u></p>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">Randy, <u></u><u></u></p>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">Is the=C2=A0<a href=3D"ht=
tps://www.ietf.org/proceedings/52/176.htm" target=3D"_blank">OPS-NM Configu=
ration Management Requirements (ops-nm) Bof</a>=C2=A0from IETF 52 (10 Decem=
ber 2001) the meeting you were thinking of?=C2=A0 There are also references
 to an IAB meeting in 2002 about the lack of use of SNMP for network config=
uration in=C2=A0<a href=3D"https://www.snmpcenter.com/snmp-versus-other-pro=
tocols/" target=3D"_blank">SNMP compared with CLI, Netconf, Netflow</a>=C2=
=A0that culminated in=C2=A0<a href=3D"https://tools.ietf.org/html/rfc3535" =
target=3D"_blank">RFC
 3535</a>. <u></u><u></u></p>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">Robin,<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">Regarding the draft in qu=
estion, I generally agree with the concerns others have made that it doesn=
=E2=80=99t appear to provide anything that other technologies such as YANG =
provide.=C2=A0 Also, IMO, the draft needs considerable
 work to be more easily understood.=C2=A0 For example, there are many acron=
yms such as CSNP and PSNP that are not defined, and may be misunderstood by=
 readers not familiar with ISIS.=C2=A0 In the packet format sections, there=
 are several uncapitalized uses of =E2=80=98should=E2=80=99.
 =C2=A0Do the authors consider these to be non-normative requirements?=C2=
=A0 There are also statements such as &quot;Network OAM statistics show tha=
t a relatively large part of the network issues are caused by the disfuncti=
on of various routing protocols and MPLS signalings=E2=80=9D
 that are offered without citations.<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">Regards,<u></u><u></u></p=
>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">Greg<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><u></u>=C2=A0<u></u></p>
<div>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">On Jul 7, 2018, at 8:25 P=
M, Randy Bush &lt;<a href=3D"mailto:randy@psg.com" target=3D"_blank">randy@=
psg.com</a>&gt; wrote:<u></u><u></u></p>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><u></u>=C2=A0<u></u></p>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">robin,<br>
<br>
i am not ignoring you. =C2=A0i did not want to write unless i had something=
<br>
possibly useful to say; and that requires pretending to think, always<br>
difficult.<br>
<br>
<br>
<u></u><u></u></p>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt">
<p class=3D"MsoNormal" style=3D"margin-left:.5in">I would also like to prop=
ose following draft for your reference which<br>
trigger us to move forward for better network maintenance with<br>
multiple tools in which gRPC/NETCOF and NMP/BMP may play different<br>
roles: <a href=3D"https://datatracker.ietf.org/doc/draft-song-ntf/" target=
=3D"_blank">https://datatracker.ietf.org/<wbr>doc/draft-song-ntf/</a><u></u=
><u></u></p>
</blockquote>
<p class=3D"MsoNormal" style=3D"margin-right:0in;margin-bottom:12.0pt;margi=
n-left:.5in">
<br>
[ warning: my memory is likely fuzzy, and the glass is dark ]<br>
<br>
at an ietf in the late &#39;90s[0], there was a hastily called meeting of<b=
r>
the snmp standards bearers and a bunch of operators. =C2=A0the snmp folk we=
re<br>
shocked to learn that no operators used snmp for other than monitoring;<br>
no one had snmp write enabled on devices; ops configured with the<br>
cli[1]. =C2=A0from this was born netconf and the xml path. =C2=A0credit whe=
re due:<br>
phil eng was already well down this path at the time of that meeting.<br>
<br>
but netconf/xml was a mechanism and lacked a model. =C2=A0snmp had models,<=
br>
whether we thought they were pretty or not. =C2=A0thus yang was born, and ,=
<br>
of course, a new generation wants to use the latest modern toys such as<br>
restconf, openconfig, json, ...<br>
<br>
draft-song-ntf yearns for an &quot;architectural framework for network<br>
telemetry,&quot; a lofty and worthwhile goal not, a priori, a bad one. =C2=
=A0but a<br>
few comments from a jaded old dog.<br>
<br>
for a new paradigm to gain traction, it must be *significantly* better<br>
than the old one, or the old paradigm must be clearly failing. =C2=A0in the=
<br>
story above, snmp was clearly failing, aside from using an unfashionable<br=
>
encoding. =C2=A0and yang clearly provided something needed and missing from=
<br>
netconf. =C2=A0note that this paradigm shift has taken over 20 years; and w=
e<br>
dis the itu et alia.<br>
<br>
second, draft-song-ntf is an export-only model. =C2=A0while telemetry is<br=
>
extremely important, i will be very frustrated if i can only hear and<br>
may not speak. =C2=A0and the more it evolves to a really attractive paradig=
m<br>
and model, the more annoyed i will be that i can not use it for control.<br=
>
<br>
and lastly, to quote don knuth, &quot;premature optimization is the root of=
<br>
all evil.&quot; =C2=A0do not get distracted by squeezing bits out of an enc=
oding.<br>
focus on things such as simple, clear, securable, extensible ...<br>
<br>
randy<br>
<br>
---<br>
<br>
0 - i would love help pinning down which meeting<br>
<br>
1 - i still have the &quot;it&#39;s the cli, stupid&quot; tee shirt. =C2=A0=
an american<br>
=C2=A0=C2=A0=C2=A0political slogan of the era was &quot;it&#39;s the econom=
y, stupid.&quot;<u></u><u></u></p>
</div>
</div>
</blockquote>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><u></u>=C2=A0<u></u></p>
</div>
</div>
</div></div></div>
</div>

<br>______________________________<wbr>_________________<br>
GROW mailing list<br>
<a href=3D"mailto:GROW@ietf.org">GROW@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/grow" rel=3D"noreferrer" t=
arget=3D"_blank">https://www.ietf.org/mailman/<wbr>listinfo/grow</a><br>
<br></blockquote></div><br></div>

--000000000000baff480570b5d146--


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Date: Wed, 11 Jul 2018 08:56:30 -0400
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From: Randy Bush <randy@psg.com>
To: Robert Raszuk <robert@raszuk.net>
Cc: "Tim Evens (tievens)" <tievens=40cisco.com@dmarc.ietf.org>, Greg Skinner <gregskinner0=40icloud.com@dmarc.ietf.org>, "lizhenbin@huawei.com" <lizhenbin@huawei.com>, "lsr@ietf.org" <lsr@ietf.org>, GMO Crops <grow@ietf.org>, "opsawg@ietf.org" <opsawg@ietf.org>, "rtgwg@ietf.org" <rtgwg@ietf.org>
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Subject: Re: [Lsr] [GROW] FW: New Version Notification for draft-gu-network-mornitoring-protol-00.txt
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> But I guess we all agree that this is not the best use of BGP protocol to
> be now a vehicle of NMS only because it is easy with BGP to establish a TCP
> session and to distribute "stuff" in a relatively loop free fashion.

now that dns over tcp/tls is being deployed, we can return to the other
overused protocol.  < emoji for drippinng sarcasm >

randy


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To: Greg Skinner <gregskinner0=40icloud.com@dmarc.ietf.org>, Randy Bush <randy@psg.com>, "rwilton=40cisco.com@dmarc.ietf.org" <rwilton=40cisco.com@dmarc.ietf.org>, "acee@cisco.com" <acee@cisco.com>, "einarnn=40cisco.com@dmarc.ietf.org" <einarnn=40cisco.com@dmarc.ietf.org>, "jefftant.ietf@gmail.com" <jefftant.ietf@gmail.com>
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From: "Guyunan (Yunan Gu, IP Technology Research Dept. NW)" <guyunan@huawei.com>
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Thread-Topic: [GROW] [Lsr] FW: New Version Notification for draft-gu-network-mornitoring-protol-00.txt
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--_000_C01B0098369B2D4391851938DA6700B7CA5CFDDGGEMI524MBSchina_--


From nobody Mon Jul 16 07:26:42 2018
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Subject: [Lsr] I-D Action: draft-ietf-isis-yang-isis-cfg-22.txt
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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           : YANG Data Model for IS-IS protocol
        Authors         : Stephane Litkowski
                          Derek Yeung
                          Acee Lindem
                          Jeffrey Zhang
                          Ladislav Lhotka
	Filename        : draft-ietf-isis-yang-isis-cfg-22.txt
	Pages           : 104
	Date            : 2018-07-16

Abstract:
   This document defines a YANG data model that can be used to configure
   and manage IS-IS protocol on network elements.



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-isis-yang-isis-cfg/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-isis-yang-isis-cfg-22
https://datatracker.ietf.org/doc/html/draft-ietf-isis-yang-isis-cfg-22

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-isis-yang-isis-cfg-22


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/


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From: "Ketan Talaulikar (ketant)" <ketant@cisco.com>
To: "uma.chunduri@huawei.com" <uma.chunduri@huawei.com>, "lsr@ietf.org" <lsr@ietf.org>
CC: "spring@ietf.org" <spring@ietf.org>
Thread-Topic: Concerns with draft-chunduri-lsr-isis-preferred-path-routing
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Date: Tue, 17 Jul 2018 11:13:27 +0000
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Subject: [Lsr] Concerns with draft-chunduri-lsr-isis-preferred-path-routing
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Hi Uma,

I would like share more context on the concerns that I raised on this propo=
sal in LSR WG yesterday where we could not complete our discussion on the m=
ike due to time constraints.

IGPs were originally invented for topology computation and then route progr=
amming based on the SPT computed. We've extended IGPs to carry/flood inform=
ation and this includes information that were meant for various application=
s. IGPs always do distribute topology computation - that is the core princi=
ple.

The PPR proposal takes IGPs into the area of flooding p2p paths and then se=
tting up forwarding state along the path - essentially introducing path pro=
visioning capabilities into it. Essentially adding a new functionality that=
 is NOT distributed topology computation.

For clarity, I could summarize the PPR as follows (please correct if wrong)=
:
- Someone (head-end or controller) computes a SR Path which is expressed as=
 a SID List (it's a list of EROs just like in RSVP-TE - loose or strict)
- The head-end floods this SR Path (and its EROs) into the IGP domain so al=
l routers in the area get the P2P paths computed by all head-ends
- Each router then must look at every such SR Path flooded by every router =
and examine if it is part of the ERO list; if so then it needs to program t=
he forwarding state for that PPR id (aka label)
- The headend can then just look at this like a "tunnel" and do something l=
ike IGP shortcut to the destination behind it

This is picking EROs from RSVP-TE and putting them into IGPs for flooding p=
2p path state pervasively. Consider the kind of flooding scale and challeng=
es when all these SR Paths go to every router irrespective of whether they =
need/use it. Then on top of that, we are proposing IGPs to program a local =
cross-connect if they are on that SR Path.

My question is, why not just use RSVP-TE in this case? RSVP-TE does signall=
ing but it does it only on the nodes that matter for a specific LSP.=20

This is called SR but it introduces a forwarding state on each of the hops =
(i.e. the PPR label cross-connect) - something different from SR architectu=
re. Including SPRING group as well for the review of this proposed SR solut=
ion.

Seems like a mishmash of SR and RSVP-TE to me and I am concerned about wher=
e this takes IGPs.

Thanks,
Ketan


From nobody Tue Jul 17 05:57:20 2018
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From: Uma Chunduri <uma.chunduri@huawei.com>
To: "Ketan Talaulikar (ketant)" <ketant@cisco.com>, "lsr@ietf.org" <lsr@ietf.org>
CC: "spring@ietf.org" <spring@ietf.org>
Thread-Topic: Concerns with draft-chunduri-lsr-isis-preferred-path-routing
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Date: Tue, 17 Jul 2018 12:56:59 +0000
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Subject: Re: [Lsr] Concerns with draft-chunduri-lsr-isis-preferred-path-routing
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Hi Ketan,


In-line [Uma]:
--
Uma C.

-----Original Message-----
From: Ketan Talaulikar (ketant) [mailto:ketant@cisco.com]=20
Sent: Tuesday, July 17, 2018 7:13 AM
To: Uma Chunduri <uma.chunduri@huawei.com>; lsr@ietf.org
Cc: spring@ietf.org
Subject: Concerns with draft-chunduri-lsr-isis-preferred-path-routing

Hi Uma,

I would like share more context on the concerns that I raised on this propo=
sal in LSR WG yesterday where we could not complete our discussion on the m=
ike due to time constraints.

IGPs were originally invented for topology computation and then route progr=
amming based on the SPT computed. We've extended IGPs to carry/flood inform=
ation and this includes information that were meant for various application=
s. IGPs always do distribute topology computation - that is the core princi=
ple.

The PPR proposal takes IGPs into the area of flooding p2p paths and then se=
tting up forwarding state along the path - essentially introducing path pro=
visioning capabilities into it. Essentially adding a new functionality that=
 is NOT distributed topology computation.

For clarity, I could summarize the PPR as follows (please correct if wrong)=
:
- Someone (head-end or controller) computes a SR Path which is expressed as=
 a SID List (it's a list of EROs just like in RSVP-TE - loose or strict)
- The head-end floods this SR Path (and its EROs) into the IGP domain so al=
l routers in the area get the P2P paths computed by all head-ends
- Each router then must look at every such SR Path flooded by every router =
and examine if it is part of the ERO list; if so then it needs to program t=
he forwarding state for that PPR id (aka label)
- The headend can then just look at this like a "tunnel" and do something l=
ike IGP shortcut to the destination behind it

This is picking EROs from RSVP-TE and putting them into IGPs for flooding p=
2p path state pervasively. Consider the kind of flooding scale and challeng=
es when all these SR Paths go to every router irrespective of whether they =
need/use it. Then on top of that, we are proposing IGPs to program a local =
cross-connect if they are on that SR Path. My question is, why not just use=
 RSVP-TE in this case? RSVP-TE does signalling but it does it only on the n=
odes that matter for a specific LSP.=20

[Uma]:  This helps in deployments, who is seeking source routing paradigm, =
but SID stack on the packet is unsustainable. This statement is applicable =
for both MPLS and IPv6 case.=20
                 Coming to the EROs in IGP - it was there in SR drafts, inc=
luding as working group draft for 3 years.  But what completely lacked was =
how to use those. There are significant differences in the format and impor=
tantly usage to solve various issues including hardware=20
                Compatibilities of various line cards (and hence available =
paths), MTU and line rate issues. I don't think you can use RSVP-TE to solv=
e these SR issues.

This is called SR but it introduces a forwarding state on each of the hops =
(i.e. the PPR label cross-connect) - something different from SR architectu=
re.=20

[Uma]:  You already introduced per path state in various cases (binding sid=
s to local policy, flex-algo).  This has been discussed lately as part of r=
e-chartering discussion.=20
                 This thread discusses that in detail and I fully concur wh=
at Dave said here https://www.ietf.org/mail-archive/web/spring/current/msg0=
3794.html=20



From nobody Tue Jul 17 06:33:59 2018
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Subject: Re: [Lsr] Concerns with draft-chunduri-lsr-isis-preferred-path-routing
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Hi Uma,

On 17/07/18 08:56 , Uma Chunduri wrote:
> Hi Ketan,
>
>
> In-line [Uma]:
> --
> Uma C.
>
> -----Original Message-----
> From: Ketan Talaulikar (ketant) [mailto:ketant@cisco.com]
> Sent: Tuesday, July 17, 2018 7:13 AM
> To: Uma Chunduri <uma.chunduri@huawei.com>; lsr@ietf.org
> Cc: spring@ietf.org
> Subject: Concerns with draft-chunduri-lsr-isis-preferred-path-routing
>
> Hi Uma,
>
> I would like share more context on the concerns that I raised on this proposal in LSR WG yesterday where we could not complete our discussion on the mike due to time constraints.
>
> IGPs were originally invented for topology computation and then route programming based on the SPT computed. We've extended IGPs to carry/flood information and this includes information that were meant for various applications. IGPs always do distribute topology computation - that is the core principle.
>
> The PPR proposal takes IGPs into the area of flooding p2p paths and then setting up forwarding state along the path - essentially introducing path provisioning capabilities into it. Essentially adding a new functionality that is NOT distributed topology computation.
>
> For clarity, I could summarize the PPR as follows (please correct if wrong):
> - Someone (head-end or controller) computes a SR Path which is expressed as a SID List (it's a list of EROs just like in RSVP-TE - loose or strict)
> - The head-end floods this SR Path (and its EROs) into the IGP domain so all routers in the area get the P2P paths computed by all head-ends
> - Each router then must look at every such SR Path flooded by every router and examine if it is part of the ERO list; if so then it needs to program the forwarding state for that PPR id (aka label)
> - The headend can then just look at this like a "tunnel" and do something like IGP shortcut to the destination behind it
>
> This is picking EROs from RSVP-TE and putting them into IGPs for flooding p2p path state pervasively. Consider the kind of flooding scale and challenges when all these SR Paths go to every router irrespective of whether they need/use it. Then on top of that, we are proposing IGPs to program a local cross-connect if they are on that SR Path. My question is, why not just use RSVP-TE in this case? RSVP-TE does signalling but it does it only on the nodes that matter for a specific LSP.
>
> [Uma]:  This helps in deployments, who is seeking source routing paradigm, but SID stack on the packet is unsustainable. This statement is applicable for both MPLS and IPv6 case.
>                   Coming to the EROs in IGP - it was there in SR drafts, including as working group draft for 3 years.  But what completely lacked was how to use those. There are significant differences in the format and importantly usage to solve various issues including hardware
>                  Compatibilities of various line cards (and hence available paths), MTU and line rate issues. I don't think you can use RSVP-TE to solve these SR issues.
>
> This is called SR but it introduces a forwarding state on each of the hops (i.e. the PPR label cross-connect) - something different from SR architecture.
>
> [Uma]:  You already introduced per path state in various cases (binding sids to local policy, flex-algo).  This has been discussed lately as part of re-chartering discussion.

flex-algo is NOT a per path state. It's a regular prefix-SID, which is 
bound to a prefix only.

The problem with your proposal is that you flood all paths to all 
routers in the area and ask every router to evaluate all of them and see 
which of them may apply. This scale poorly.

thanks,
Peter

>                   This thread discusses that in detail and I fully concur what Dave said here https://www.ietf.org/mail-archive/web/spring/current/msg03794.html
>
>
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr
> .
>


From nobody Tue Jul 17 06:43:22 2018
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From: Uma Chunduri <uma.chunduri@huawei.com>
To: Peter Psenak <ppsenak@cisco.com>, "Ketan Talaulikar (ketant)" <ketant@cisco.com>, "lsr@ietf.org" <lsr@ietf.org>
CC: "spring@ietf.org" <spring@ietf.org>
Thread-Topic: [Lsr] Concerns with draft-chunduri-lsr-isis-preferred-path-routing
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Subject: Re: [Lsr] Concerns with draft-chunduri-lsr-isis-preferred-path-routing
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Hi Peter,


-----Original Message-----
From: Peter Psenak [mailto:ppsenak@cisco.com]=20
Sent: Tuesday, July 17, 2018 9:34 AM
To: Uma Chunduri <uma.chunduri@huawei.com>; Ketan Talaulikar (ketant) <keta=
nt@cisco.com>; lsr@ietf.org
Cc: spring@ietf.org
Subject: Re: [Lsr] Concerns with draft-chunduri-lsr-isis-preferred-path-rou=
ting


	> flex-algo is NOT a per path state. It's a regular prefix-SID, which is b=
ound to a prefix only.

Not quite. I will come back to this bit later.

	>The problem with your proposal is that you flood all paths to all routers=
 in the area and ask every router to evaluate all of them and see which of =
them may apply. This scale poorly.

Please see Section 6, in 01 version.

--
Uma C.


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From: "Ketan Talaulikar (ketant)" <ketant@cisco.com>
To: "Acee Lindem (acee)" <acee@cisco.com>, "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>, Christian Hopps <chopps@chopps.org>, "lsr@ietf.org" <lsr@ietf.org>
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Thread-Topic: [Lsr] WG Last Call for draft-ietf-lsr-isis-rfc7810bis-00
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From: "Ketan Talaulikar (ketant)" <ketant@cisco.com>
To: Uma Chunduri <uma.chunduri@huawei.com>, "lsr@ietf.org" <lsr@ietf.org>
CC: "spring@ietf.org" <spring@ietf.org>
Thread-Topic: Concerns with draft-chunduri-lsr-isis-preferred-path-routing
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Subject: Re: [Lsr] Concerns with draft-chunduri-lsr-isis-preferred-path-routing
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Hi Uma,

Please check inline below.

Thanks,
Ketan

-----Original Message-----
From: Uma Chunduri <uma.chunduri@huawei.com>=20
Sent: 17 July 2018 08:57
To: Ketan Talaulikar (ketant) <ketant@cisco.com>; lsr@ietf.org
Cc: spring@ietf.org
Subject: RE: Concerns with draft-chunduri-lsr-isis-preferred-path-routing

Hi Ketan,


In-line [Uma]:
--
Uma C.

-----Original Message-----
From: Ketan Talaulikar (ketant) [mailto:ketant@cisco.com]=20
Sent: Tuesday, July 17, 2018 7:13 AM
To: Uma Chunduri <uma.chunduri@huawei.com>; lsr@ietf.org
Cc: spring@ietf.org
Subject: Concerns with draft-chunduri-lsr-isis-preferred-path-routing

Hi Uma,

I would like share more context on the concerns that I raised on this propo=
sal in LSR WG yesterday where we could not complete our discussion on the m=
ike due to time constraints.

IGPs were originally invented for topology computation and then route progr=
amming based on the SPT computed. We've extended IGPs to carry/flood inform=
ation and this includes information that were meant for various application=
s. IGPs always do distribute topology computation - that is the core princi=
ple.

The PPR proposal takes IGPs into the area of flooding p2p paths and then se=
tting up forwarding state along the path - essentially introducing path pro=
visioning capabilities into it. Essentially adding a new functionality that=
 is NOT distributed topology computation.

For clarity, I could summarize the PPR as follows (please correct if wrong)=
:
- Someone (head-end or controller) computes a SR Path which is expressed as=
 a SID List (it's a list of EROs just like in RSVP-TE - loose or strict)
- The head-end floods this SR Path (and its EROs) into the IGP domain so al=
l routers in the area get the P2P paths computed by all head-ends
- Each router then must look at every such SR Path flooded by every router =
and examine if it is part of the ERO list; if so then it needs to program t=
he forwarding state for that PPR id (aka label)
- The headend can then just look at this like a "tunnel" and do something l=
ike IGP shortcut to the destination behind it

This is picking EROs from RSVP-TE and putting them into IGPs for flooding p=
2p path state pervasively. Consider the kind of flooding scale and challeng=
es when all these SR Paths go to every router irrespective of whether they =
need/use it. Then on top of that, we are proposing IGPs to program a local =
cross-connect if they are on that SR Path. My question is, why not just use=
 RSVP-TE in this case? RSVP-TE does signalling but it does it only on the n=
odes that matter for a specific LSP.=20

[Uma]:  This helps in deployments, who is seeking source routing paradigm, =
but SID stack on the packet is unsustainable. This statement is applicable =
for both MPLS and IPv6 case.=20
[KT] Could we look at why the SID stack is getting "unsustainable" in the f=
irst place?

                 Coming to the EROs in IGP - it was there in SR drafts, inc=
luding as working group draft for 3 years.  But what completely lacked was =
how to use those.
[KT] Right and I never thought/realized that this was the purpose of those =
EROs. I repeat the scale challenge and that you are proposing to re-purpose=
 IGPs for programming MPLS cross-connects for hop-by-hop LSP setup. This is=
 my concern.

 There are significant differences in the format and importantly usage to s=
olve various issues including hardware=20
                Compatibilities of various line cards (and hence available =
paths), MTU and line rate issues. I don't think you can use RSVP-TE to solv=
e these SR issues.

This is called SR but it introduces a forwarding state on each of the hops =
(i.e. the PPR label cross-connect) - something different from SR architectu=
re.=20

[Uma]:  You already introduced per path state in various cases (binding sid=
s to local policy, flex-algo).  This has been discussed lately as part of r=
e-chartering discussion.=20
                 This thread discusses that in detail and I fully concur wh=
at Dave said here https://www.ietf.org/mail-archive/web/spring/current/msg0=
3794.html=20
[KT] Dave's argument was in multicast context while he was giving the p2p e=
xample perhaps as a worst case theoretical example. IMHO we should not look=
 at such worst case scenarios. To me, this is a hybrid proposal to bring a =
hop by hop path (which is why the SID stack is so huge) like in RSVP-TE int=
o an SR network and then try to figure out a way to do this in IGPs. You ca=
n feel free to disagree :-)

Thanks,
Ketan



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From: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
To: "Ketan Talaulikar (ketant)" <ketant@cisco.com>, "Acee Lindem (acee)" <acee@cisco.com>, Christian Hopps <chopps@chopps.org>, "lsr@ietf.org" <lsr@ietf.org>
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From: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
To: Uma Chunduri <uma.chunduri@huawei.com>, "Peter Psenak (ppsenak)" <ppsenak@cisco.com>, "Ketan Talaulikar (ketant)" <ketant@cisco.com>, "lsr@ietf.org" <lsr@ietf.org>
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Thread-Topic: [Lsr] Concerns with draft-chunduri-lsr-isis-preferred-path-routing
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Subject: Re: [Lsr] Concerns with draft-chunduri-lsr-isis-preferred-path-routing
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Uma -

I share the concerns expressed by Ketan and Peter.

Although I will certainly consider the additional response you seem to have=
 hinted at in your reply to Peter, it seems to me that Section 6 of your dr=
aft acknowledges that there is a scaling problem - and then references what=
 seems to be a non-existent draft (I could not find "draft-ce-ppr-graph-00"=
 ???) as a proposed solution.

In any further response you make it would be good if you did indicate wheth=
er you agree PPR has a scaling issue - and given the contents of Section 6 =
of your draft - also discuss why we should consider PPR + some additional s=
caling enhancements when we already have at least one solution which does s=
cale linearly.

Thanx.

    Les


> -----Original Message-----
> From: Lsr <lsr-bounces@ietf.org> On Behalf Of Uma Chunduri
> Sent: Tuesday, July 17, 2018 6:43 AM
> To: Peter Psenak (ppsenak) <ppsenak@cisco.com>; Ketan Talaulikar (ketant)
> <ketant@cisco.com>; lsr@ietf.org
> Cc: spring@ietf.org
> Subject: Re: [Lsr] Concerns with draft-chunduri-lsr-isis-preferred-path-r=
outing
>=20
> Hi Peter,
>=20
>=20
> -----Original Message-----
> From: Peter Psenak [mailto:ppsenak@cisco.com]
> Sent: Tuesday, July 17, 2018 9:34 AM
> To: Uma Chunduri <uma.chunduri@huawei.com>; Ketan Talaulikar (ketant)
> <ketant@cisco.com>; lsr@ietf.org
> Cc: spring@ietf.org
> Subject: Re: [Lsr] Concerns with draft-chunduri-lsr-isis-preferred-path-r=
outing
>=20
>=20
> 	> flex-algo is NOT a per path state. It's a regular prefix-SID, which is
> bound to a prefix only.
>=20
> Not quite. I will come back to this bit later.
>=20
> 	>The problem with your proposal is that you flood all paths to all route=
rs
> in the area and ask every router to evaluate all of them and see which of=
 them
> may apply. This scale poorly.
>=20
> Please see Section 6, in 01 version.
>=20
> --
> Uma C.
>=20
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr


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From: "Ketan Talaulikar (ketant)" <ketant@cisco.com>
To: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>, "Acee Lindem (acee)" <acee@cisco.com>, Christian Hopps <chopps@chopps.org>, "lsr@ietf.org" <lsr@ietf.org>
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Thread-Topic: [Lsr] WG Last Call for draft-ietf-lsr-isis-rfc7810bis-00
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From nobody Tue Jul 17 11:40:12 2018
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From: Uma Chunduri <uma.chunduri@gmail.com>
Date: Tue, 17 Jul 2018 14:40:06 -0400
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Subject: Re: [Lsr] [spring] Concerns with draft-chunduri-lsr-isis-preferred-path-routing
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                > [Uma]:  This helps in deployments, who is seeking source
routing paradigm, but SID stack on the packet is unsustainable. This
statement is applicable for both MPLS and IPv6 case.

                >[KT] Could we look at why the SID stack is getting
"unsustainable" in the first place?



I am not sure what you want to look - plz don't ask topology of a
particular deployment and how the SRH/SR-MPLS path is crafted?

Please see the generic example and some of the references in the draft.  You
have to tell me the issues summarized for various deployments (including
brownfield scenarios) are not an issue.

If this is not an issue there is no need for MSD capability either and all
the hoops to discover this capability and work around. I don't think you  can
definitely say, you can limit X SR SIDs in SRH and Y labels etc..



                 >[KT] Dave's argument was in multicast context while he
was giving the p2p example perhaps as a worst case theoretical example.
IMHO we should not look at such worst case scenarios.

                 >To me, this is a hybrid proposal to bring a hop by hop
path (which is why the SID stack is so huge) like in RSVP-TE into an SR
network and then try to figure out a way to do this in IGPs. You can feel
free to disagree :-)



This is not the worst case scenario (I just referred to the thread overall
and discussion of adding a FIB entry is considered OK and being argued it
is not OK stating that as considered as  "state" - I feel at some level we
are confusing with this and the soft state and refresh required thereof );
it could be the base scenario, depending on the deployment.



--

Uma C.

--0000000000006228c3057136463f
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div class=3D"gmail_extra">


















<p class=3D"gmail-MsoPlainText" style=3D"margin:0in 0in 0.0001pt;font-size:=
11pt;font-family:Calibri,sans-serif"><a name=3D"_MailOriginal"><span>=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 </span>&gt;
[Uma]:<span>=C2=A0 </span>This helps in deployments, who is
seeking source routing paradigm, but SID stack on the packet is unsustainab=
le.
This statement is applicable for both MPLS and IPv6 case. <span></span></a>=
</p>

<p class=3D"gmail-MsoPlainText" style=3D"margin:0in 0in 0.0001pt;font-size:=
11pt;font-family:Calibri,sans-serif"><span><span>=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 </span>&=
gt;[KT] Could we look at why
the SID stack is getting &quot;unsustainable&quot; in the first place?<span=
></span></span></p>

<p class=3D"gmail-MsoPlainText" style=3D"margin:0in 0in 0.0001pt;font-size:=
11pt;font-family:Calibri,sans-serif"><span><span>=C2=A0</span></span></p>

<p class=3D"gmail-MsoPlainText" style=3D"margin:0in 0in 0.0001pt;font-size:=
11pt;font-family:Calibri,sans-serif"><span><span style=3D"color:black">I am=
 not sure what you want to look - plz don&#39;t ask topology of a
particular deployment and how the SRH/SR-MPLS path is crafted?=C2=A0</span>=
</span></p><p class=3D"gmail-MsoPlainText" style=3D"margin:0in 0in 0.0001pt=
;font-size:11pt;font-family:Calibri,sans-serif"><span><span style=3D"color:=
black">Please see the generic example and some of the references in the
draft.<span>=C2=A0 </span>You have to tell me the issues summarized
for various deployments (including brownfield scenarios) are not an issue.=
=C2=A0</span></span></p><p class=3D"gmail-MsoPlainText" style=3D"margin:0in=
 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span><span st=
yle=3D"color:black">If
this is not an issue there is no need for MSD capability either and all the
hoops to discover this capability and work around. I don&#39;t think you <s=
pan>=C2=A0</span>can definitely say, you can limit X SR SIDs in
SRH and Y labels etc..<span></span></span></span></p>

<p class=3D"gmail-MsoPlainText" style=3D"margin:0in 0in 0.0001pt;font-size:=
11pt;font-family:Calibri,sans-serif"><span><span style=3D"color:black"><spa=
n>=C2=A0</span></span></span></p>

<p class=3D"gmail-MsoPlainText" style=3D"margin:0in 0in 0.0001pt;font-size:=
11pt;font-family:Calibri,sans-serif"><span><span>=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 </span><=
span>=C2=A0</span>&gt;[KT] Dave&#39;s argument was in multicast
context while he was giving the p2p example perhaps as a worst case theoret=
ical
example. IMHO we should not look at such worst case scenarios. <span></span=
></span></p>

<p class=3D"gmail-MsoPlainText" style=3D"margin:0in 0in 0.0001pt;font-size:=
11pt;font-family:Calibri,sans-serif"><span><span>=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 </span><=
span>=C2=A0</span>&gt;To me, this is a hybrid proposal to bring
a hop by hop path (which is why the SID stack is so huge) like in RSVP-TE i=
nto
an SR network and then try to figure out a way to do this in IGPs. You can =
feel
free to disagree :-)<span></span></span></p>

<p class=3D"gmail-MsoPlainText" style=3D"margin:0in 0in 0.0001pt;font-size:=
11pt;font-family:Calibri,sans-serif"><span><span>=C2=A0</span></span></p>

<p class=3D"gmail-MsoPlainText" style=3D"margin:0in 0in 0.0001pt"><font col=
or=3D"#000000" face=3D"Calibri, sans-serif"><span style=3D"font-size:11pt">=
This is not the worst case scenario (I just referred to the
thread overall and discussion of adding a FIB entry is considered </span><s=
pan style=3D"font-size:14.6667px">OK</span><span style=3D"font-size:11pt">=
=C2=A0and being
argued it is not </span><span style=3D"font-size:14.6667px">OK</span><span =
style=3D"font-size:11pt">=C2=A0stating that as considered as </span></font>=
<span style=3D"color:black;font-family:Calibri,sans-serif;font-size:11pt">=
=C2=A0</span><font color=3D"#000000" face=3D"Calibri, sans-serif"><span sty=
le=3D"font-size:11pt">&quot;state&quot; - I feel at some level we
are confusing with this and the soft state and refresh required thereof ); =
it could be the
base scenario, depending on the deployment.</span><span style=3D"font-size:=
11pt"></span></font></p>

<p class=3D"gmail-MsoPlainText" style=3D"margin:0in 0in 0.0001pt;font-size:=
11pt;font-family:Calibri,sans-serif"><span><span style=3D"color:black"><spa=
n>=C2=A0</span></span></span></p>

<p class=3D"gmail-MsoPlainText" style=3D"margin:0in 0in 0.0001pt;font-size:=
11pt;font-family:Calibri,sans-serif"><span><span style=3D"color:black">--<s=
pan></span></span></span></p>

<p class=3D"gmail-MsoPlainText" style=3D"margin:0in 0in 0.0001pt;font-size:=
11pt;font-family:Calibri,sans-serif"><span><span style=3D"color:black">Uma =
C.<span></span></span></span></p>





<br></div></div>

--0000000000006228c3057136463f--


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From: Uma Chunduri <uma.chunduri@gmail.com>
Date: Tue, 17 Jul 2018 14:43:38 -0400
Message-ID: <CA+t703xFRRakRB7rfJGFL-Dp8zoKddtcEXM7HRcgcRB0PSvMBg@mail.gmail.com>
To: "Les Ginsberg (ginsberg)" <ginsberg=40cisco.com@dmarc.ietf.org>
Cc: Uma Chunduri <uma.chunduri@huawei.com>, "Peter Psenak (ppsenak)" <ppsenak@cisco.com>,  "Ketan Talaulikar (ketant)" <ketant@cisco.com>, "lsr@ietf.org" <lsr@ietf.org>,  "spring@ietf.org" <spring@ietf.org>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/tSTTRjnC-KOlVUyJ1qbSn5o6-Ts>
Subject: Re: [Lsr] [spring] Concerns with draft-chunduri-lsr-isis-preferred-path-routing
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--00000000000008a2160571365307
Content-Type: text/plain; charset="UTF-8"

Les -

in-line

..


>
> Although I will certainly consider the additional response you seem to
> have hinted at in your reply to Peter, it seems to me that Section 6 of
> your draft acknowledges that there is a scaling problem


[Uma]:  What it says is there is no scale issue in certain deployments
where only limited number of pats are required (examples given).  In that
case you don't need any *further extensions* as referred.
              As we noted this is fully backward compatible for SR-MPLS and
SRH data planes and one can go ahead and use it one can't find a path and
SID depth is an issue (in terms of  any of these, HW compatibility, Line
rate, header tax or MTU).


> - and then references what seems to be a non-existent draft (I could not
> find "draft-ce-ppr-graph-00" ???) as a proposed solution.
>

[Uma]: This will be posted soon, few things are being worked out. This
helps in certain cases (you will see soon), where you want to scale
optimized paths.


>
> In any further response you make it would be good if you did indicate
> whether you agree PPR has a scaling issue -


[Uma]: Plz see above..


> Thanx.
>
>     Les
>
>

--00000000000008a2160571365307
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<div dir=3D"ltr"><div class=3D"gmail_extra"><div class=3D"gmail_quote"><div=
>Les -</div><div><br></div><div>in-line</div><div><br></div><div>..</div><d=
iv>=C2=A0</div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex=
;border-left:1px #ccc solid;padding-left:1ex">
<br>
Although I will certainly consider the additional response you seem to have=
 hinted at in your reply to Peter, it seems to me that Section 6 of your dr=
aft acknowledges that there is a scaling problem</blockquote><div><br></div=
><div>[Uma]:=C2=A0 What it says is there is no scale issue in certain deplo=
yments where only limited number of pats are required (examples given).=C2=
=A0 In that case you don&#39;t need any *further extensions* as referred.</=
div><div>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 As we noted this =
is fully backward compatible for SR-MPLS and SRH data planes and one can go=
 ahead and use it one can&#39;t find a path and SID depth is an issue (in t=
erms of=C2=A0 any of these, HW compatibility, Line rate, header tax or MTU)=
.=C2=A0</div><div>=C2=A0</div><blockquote class=3D"gmail_quote" style=3D"ma=
rgin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> - and then re=
ferences what seems to be a non-existent draft (I could not find &quot;draf=
t-ce-ppr-graph-00&quot; ???) as a proposed solution.<br></blockquote><div>=
=C2=A0</div><div>[Uma]: This will be posted soon, few things are being work=
ed out. This helps in certain cases (you will see soon), where you want to =
scale optimized paths.</div><div>=C2=A0</div><blockquote class=3D"gmail_quo=
te" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"=
>
<br>
In any further response you make it would be good if you did indicate wheth=
er you agree PPR has a scaling issue - </blockquote><div><br></div><div>[Um=
a]: Plz see above..</div><div><br></div><blockquote class=3D"gmail_quote" s=
tyle=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<br>
Thanx.<br>
<span class=3D"HOEnZb"><font color=3D"#888888"><br>
=C2=A0 =C2=A0 Les<br>
</font></span><div class=3D"HOEnZb"><div class=3D"h5"><br></div></div></blo=
ckquote></div></div></div>

--00000000000008a2160571365307--


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From: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
To: "Ketan Talaulikar (ketant)" <ketant@cisco.com>, "Acee Lindem (acee)" <acee@cisco.com>, Christian Hopps <chopps@chopps.org>, "lsr@ietf.org" <lsr@ietf.org>
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Thread-Topic: [Lsr] WG Last Call for draft-ietf-lsr-isis-rfc7810bis-00
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Thread-Topic: OSPF/IS-IS Entropy Label Signaling Drafts 
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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           : IS-IS Traffic Engineering (TE) Metric Extensions
        Authors         : Les Ginsberg
                          Stefano Previdi
                          Spencer Giacolone
                          Dave Ward
                          John Drake
                          Qin Wu
	Filename        : draft-ietf-lsr-isis-rfc7810bis-01.txt
	Pages           : 19
	Date            : 2018-07-17

Abstract:
   In certain networks, such as, but not limited to, financial
   information networks (e.g., stock market data providers), network-
   performance criteria (e.g., latency) are becoming as critical to
   data-path selection as other metrics.

   This document describes extensions to IS-IS Traffic Engineering
   Extensions (RFC 5305) such that network-performance information can
   be distributed and collected in a scalable fashion.  The information
   distributed using IS-IS TE Metric Extensions can then be used to make
   path-selection decisions based on network performance.

   Note that this document only covers the mechanisms with which
   network-performance information is distributed.  The mechanisms for
   measuring network performance or acting on that information, once
   distributed, are outside the scope of this document.

   This document obsoletes RFC 7810.



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-rfc7810bis/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-lsr-isis-rfc7810bis-01
https://datatracker.ietf.org/doc/html/draft-ietf-lsr-isis-rfc7810bis-01

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-lsr-isis-rfc7810bis-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/


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From: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
To: "Les Ginsberg (ginsberg)" <ginsberg=40cisco.com@dmarc.ietf.org>, "Ketan Talaulikar (ketant)" <ketant@cisco.com>, "Acee Lindem (acee)" <acee@cisco.com>, Christian Hopps <chopps@chopps.org>, "lsr@ietf.org" <lsr@ietf.org>
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Thread-Topic: [Lsr] WG Last Call for draft-ietf-lsr-isis-rfc7810bis-00
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Date: Tue, 17 Jul 2018 21:31:34 +0000
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From: Uma Chunduri <umac.ietf@gmail.com>
Date: Tue, 17 Jul 2018 18:26:13 -0400
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Subject: [Lsr] Fwd: IPR Poll follow up on draft-ietf-isis-segment-routing-extensions-16
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---------- Forwarded message ----------
From: Saku Ytti <saku@ytti.fi>
Date: Fri, Jun 22, 2018 at 5:17 PM
Subject: Re: IPR Poll follow up on
draft-ietf-isis-segment-routing-extensions-16
To: umac.ietf@gmail.com
Cc: draft-ietf-isis-segment-routing-extensions@ietf.org, "Horneffer,
Martin" <Martin.Horneffer@telekom.de>, Edward Crabbe <
edward.crabbe@gmail.com>, robjs@google.com, milojevicigor@gmail.com,
sluong@cisco.com, lsr-chairs@ietf.org


Not aware of any IPR.

On Sat, 23 Jun 2018 at 00:16, Uma Chunduri <umac.ietf@gmail.com> wrote:
>
> Dear All,
>
> All authors have responded to the IPR Poll.
>
> Still couple of contributors (as listed) need to respond to the IPR Poll
>  - Martin H.
>  - Edward C.
>  - Rob S.
>  - Igor M.
> - Saku Y.
>
> Please respond to the LSR list thread.
>
> --
> Uma C.
>
> On Fri, Jun 15, 2018 at 9:16 AM, Uma Chunduri <umac.ietf@gmail.com> wrote:
>>
>> Still need one author's and couple of contributors response for the
above subject.
>>
>> Please respond to  the LSR list thread.
>>
>> --
>> Uma C.
>
>


-- 
  ++ytti

--000000000000120a3b0571396f86
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><br><div class=3D"gmail_quote">---------- Forwarded messag=
e ----------<br>From: <b class=3D"gmail_sendername">Saku Ytti</b> <span dir=
=3D"ltr">&lt;<a href=3D"mailto:saku@ytti.fi">saku@ytti.fi</a>&gt;</span><br=
>Date: Fri, Jun 22, 2018 at 5:17 PM<br>Subject: Re: IPR Poll follow up on d=
raft-ietf-isis-segment-routing-extensions-16<br>To: <a href=3D"mailto:umac.=
ietf@gmail.com">umac.ietf@gmail.com</a><br>Cc: <a href=3D"mailto:draft-ietf=
-isis-segment-routing-extensions@ietf.org">draft-ietf-isis-segment-routing-=
extensions@ietf.org</a>, &quot;Horneffer, Martin&quot; &lt;<a href=3D"mailt=
o:Martin.Horneffer@telekom.de">Martin.Horneffer@telekom.de</a>&gt;, Edward =
Crabbe &lt;<a href=3D"mailto:edward.crabbe@gmail.com">edward.crabbe@gmail.c=
om</a>&gt;, <a href=3D"mailto:robjs@google.com">robjs@google.com</a>, <a hr=
ef=3D"mailto:milojevicigor@gmail.com">milojevicigor@gmail.com</a>, <a href=
=3D"mailto:sluong@cisco.com">sluong@cisco.com</a>, <a href=3D"mailto:lsr-ch=
airs@ietf.org">lsr-chairs@ietf.org</a><br><br><br>Not aware of any IPR.<br>
<div class=3D"HOEnZb"><div class=3D"h5"><br>
On Sat, 23 Jun 2018 at 00:16, Uma Chunduri &lt;<a href=3D"mailto:umac.ietf@=
gmail.com">umac.ietf@gmail.com</a>&gt; wrote:<br>
&gt;<br>
&gt; Dear All,<br>
&gt;<br>
&gt; All authors have responded to the IPR Poll.<br>
&gt;<br>
&gt; Still couple of contributors (as listed) need to respond to the IPR Po=
ll<br>
&gt;=C2=A0 - Martin H.<br>
&gt;=C2=A0 - Edward C.<br>
&gt;=C2=A0 - Rob S.<br>
&gt;=C2=A0 - Igor M.<br>
&gt; - Saku Y.<br>
&gt;<br>
&gt; Please respond to the LSR list thread.<br>
&gt;<br>
&gt; --<br>
&gt; Uma C.<br>
&gt;<br>
&gt; On Fri, Jun 15, 2018 at 9:16 AM, Uma Chunduri &lt;<a href=3D"mailto:um=
ac.ietf@gmail.com">umac.ietf@gmail.com</a>&gt; wrote:<br>
&gt;&gt;<br>
&gt;&gt; Still need one author&#39;s and couple of contributors response fo=
r the above subject.<br>
&gt;&gt;<br>
&gt;&gt; Please respond to=C2=A0 the LSR list thread.<br>
&gt;&gt;<br>
&gt;&gt; --<br>
&gt;&gt; Uma C.<br>
&gt;<br>
&gt;<br>
<br>
<br>
</div></div><span class=3D"HOEnZb"><font color=3D"#888888">-- <br>
=C2=A0 ++ytti<br>
</font></span></div><br></div>

--000000000000120a3b0571396f86--


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From: Uma Chunduri <umac.ietf@gmail.com>
Date: Tue, 17 Jul 2018 18:26:44 -0400
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Subject: [Lsr] Fwd: IPR Poll follow up on draft-ietf-isis-segment-routing-extensions-16
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--000000000000e8c9b405713970f2
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---------- Forwarded message ----------
From: Igor Milojevic <milojevicigor@gmail.com>
Date: Sat, Jun 23, 2018 at 1:27 AM
Subject: Re: IPR Poll follow up on
draft-ietf-isis-segment-routing-extensions-16
To: Uma Chunduri <umac.ietf@gmail.com>
Cc: Edward Crabbe <edward.crabbe@gmail.com>, Martin.Horneffer@telekom.de,
Rob Shakir <robjs@google.com>, Saku Ytti <saku@ytti.fi>,
draft-ietf-isis-segment-routing-extensions@ietf.org, lsr-chairs@ietf.org,
sluong@cisco.com


Not aware of any IPR related.

Igor

On Fri, 22 Jun 2018 at 23:16, Uma Chunduri <umac.ietf@gmail.com> wrote:

> Dear All,
>
> All authors have responded to the IPR Poll.
>
> Still couple of contributors (as listed) need to respond to the IPR Poll
>  - Martin H.
>  - Edward C.
>  - Rob S.
>  - Igor M.
> - Saku Y.
>
> Please respond to the LSR list thread.
>
> --
> Uma C.
>
> On Fri, Jun 15, 2018 at 9:16 AM, Uma Chunduri <umac.ietf@gmail.com> wrote:
>
>> Still need one author's and couple of contributors response for the above
>> subject.
>>
>> Please respond to  the LSR list thread.
>>
>> --
>> Uma C.
>>
>
>

--000000000000e8c9b405713970f2
Content-Type: text/html; charset="UTF-8"
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<div dir=3D"ltr"><br><div class=3D"gmail_quote">---------- Forwarded messag=
e ----------<br>From: <b class=3D"gmail_sendername">Igor Milojevic</b> <spa=
n dir=3D"ltr">&lt;<a href=3D"mailto:milojevicigor@gmail.com">milojevicigor@=
gmail.com</a>&gt;</span><br>Date: Sat, Jun 23, 2018 at 1:27 AM<br>Subject: =
Re: IPR Poll follow up on draft-ietf-isis-segment-routing-extensions-16<br>=
To: Uma Chunduri &lt;<a href=3D"mailto:umac.ietf@gmail.com">umac.ietf@gmail=
.com</a>&gt;<br>Cc: Edward Crabbe &lt;<a href=3D"mailto:edward.crabbe@gmail=
.com">edward.crabbe@gmail.com</a>&gt;, <a href=3D"mailto:Martin.Horneffer@t=
elekom.de">Martin.Horneffer@telekom.de</a>, Rob Shakir &lt;<a href=3D"mailt=
o:robjs@google.com">robjs@google.com</a>&gt;, Saku Ytti &lt;<a href=3D"mail=
to:saku@ytti.fi">saku@ytti.fi</a>&gt;, <a href=3D"mailto:draft-ietf-isis-se=
gment-routing-extensions@ietf.org">draft-ietf-isis-segment-routing-extensio=
ns@ietf.org</a>, <a href=3D"mailto:lsr-chairs@ietf.org">lsr-chairs@ietf.org=
</a>, <a href=3D"mailto:sluong@cisco.com">sluong@cisco.com</a><br><br><br><=
div><div dir=3D"auto">Not aware of any IPR related.</div></div><div><span c=
lass=3D"HOEnZb"><font color=3D"#888888"><div dir=3D"auto"><br></div><div>Ig=
or</div></font></span><div><div class=3D"h5"><div dir=3D"auto"><br><div cla=
ss=3D"gmail_quote" dir=3D"auto"><div>On Fri, 22 Jun 2018 at 23:16, Uma Chun=
duri &lt;<a href=3D"mailto:umac.ietf@gmail.com" target=3D"_blank">umac.ietf=
@gmail.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=
=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div>Dea=
r All,<div><br></div><div>All authors have responded to the IPR Poll.<br><d=
iv><br></div><div>Still couple of contributors (as listed) need to respond =
to the IPR Poll=C2=A0</div><div>=C2=A0- Martin H.</div><div>=C2=A0- Edward =
C.</div><div>=C2=A0- Rob S.</div><div>=C2=A0- Igor M.</div><div>- Saku Y.</=
div></div></div><div><div><div><br></div><div>Please respond to the LSR lis=
t thread.</div><div><br></div><div>--</div><div>Uma C.</div></div></div><di=
v><div><div class=3D"gmail_extra"><br><div class=3D"gmail_quote">On Fri, Ju=
n 15, 2018 at 9:16 AM, Uma Chunduri <span>&lt;<a href=3D"mailto:umac.ietf@g=
mail.com" target=3D"_blank">umac.ietf@gmail.com</a>&gt;</span> wrote:<br><b=
lockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px =
#ccc solid;padding-left:1ex"><div>Still need one author&#39;s and couple of=
 contributors response for the above subject.<div><br></div><div>Please res=
pond to=C2=A0 the LSR list thread.</div><div><br></div><div>--</div><div>Um=
a C.</div></div>
</blockquote></div><br></div></div></div></blockquote></div></div>
</div></div></div>
</div><br></div>

--000000000000e8c9b405713970f2--


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From: Uma Chunduri <umac.ietf@gmail.com>
Date: Tue, 17 Jul 2018 18:27:22 -0400
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Subject: [Lsr] Fwd: IPR Poll follow up on draft-ietf-isis-segment-routing-extensions-16
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--0000000000002f8e46057139737d
Content-Type: text/plain; charset="UTF-8"

---------- Forwarded message ----------
From: Rob Shakir <robjs@google.com>
Date: Fri, Jun 22, 2018 at 6:52 PM
Subject: Re: IPR Poll follow up on
draft-ietf-isis-segment-routing-extensions-16
To: Saku Ytti <saku@ytti.fi>
Cc: umac.ietf@gmail.com, draft-ietf-isis-segment-routing-extensions@ietf.org,
"Horneffer, Martin" <Martin.Horneffer@telekom.de>, Edward Crabbe <
edward.crabbe@gmail.com>, milojevicigor@gmail.com, sluong@cisco.com,
lsr-chairs@ietf.org


I am not aware of any IPR other than that already disclosed.

Thanks,
r.


>
>

--0000000000002f8e46057139737d
Content-Type: text/html; charset="UTF-8"
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<div dir=3D"ltr"><br><div class=3D"gmail_quote">---------- Forwarded messag=
e ----------<br>From: <b class=3D"gmail_sendername">Rob Shakir</b> <span di=
r=3D"ltr">&lt;<a href=3D"mailto:robjs@google.com">robjs@google.com</a>&gt;<=
/span><br>Date: Fri, Jun 22, 2018 at 6:52 PM<br>Subject: Re: IPR Poll follo=
w up on draft-ietf-isis-segment-routing-extensions-16<br>To: Saku Ytti &lt;=
<a href=3D"mailto:saku@ytti.fi">saku@ytti.fi</a>&gt;<br>Cc: <a href=3D"mail=
to:umac.ietf@gmail.com">umac.ietf@gmail.com</a>, <a href=3D"mailto:draft-ie=
tf-isis-segment-routing-extensions@ietf.org">draft-ietf-isis-segment-routin=
g-extensions@ietf.org</a>, &quot;Horneffer, Martin&quot; &lt;<a href=3D"mai=
lto:Martin.Horneffer@telekom.de">Martin.Horneffer@telekom.de</a>&gt;, Edwar=
d Crabbe &lt;<a href=3D"mailto:edward.crabbe@gmail.com">edward.crabbe@gmail=
.com</a>&gt;, <a href=3D"mailto:milojevicigor@gmail.com">milojevicigor@gmai=
l.com</a>, <a href=3D"mailto:sluong@cisco.com">sluong@cisco.com</a>, <a hre=
f=3D"mailto:lsr-chairs@ietf.org">lsr-chairs@ietf.org</a><br><br><br><div di=
r=3D"ltr">I am not aware of any IPR other than that already disclosed.<div>=
<br></div><div>Thanks,</div><div>r.</div></div><div class=3D"HOEnZb"><div c=
lass=3D"h5"><br><div class=3D"gmail_quote"><blockquote class=3D"gmail_quote=
" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><=
br><br></blockquote></div></div></div></div></div>

--0000000000002f8e46057139737d--


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Subject: [Lsr] I-D Action: draft-ietf-ospf-lls-interface-id-05.txt
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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           : OSPF LLS Extensions for Local Interface ID Advertisement
        Authors         : Peter Psenak
                          Ketan Jivan Talaulikar
                          Wim Henderickx
                          Padma Pillay-Esnault
	Filename        : draft-ietf-ospf-lls-interface-id-05.txt
	Pages           : 7
	Date            : 2018-07-18

Abstract:
   Every OSPF interface is assigned an identifier, Interface ID, which
   uniquely identifies the interface on the router.  In some cases it is
   useful to know the Interface ID assigned by the adjacent router on
   its side of the adjacency (Remote Interface ID).

   This draft describes the extensions to OSPF link-local signalling to
   advertise the Local Interface Identifier.



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-ospf-lls-interface-id/

There are also htmlized versions available at:
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https://datatracker.ietf.org/doc/html/draft-ietf-ospf-lls-interface-id-05

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From nobody Wed Jul 18 08:23:43 2018
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Subject: Re: [Lsr] Concerns with draft-chunduri-lsr-isis-preferred-path-routing
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Hi Uma,

On 17/07/18 09:43 , Uma Chunduri wrote:
> Hi Peter,
>
>
> -----Original Message-----
> From: Peter Psenak [mailto:ppsenak@cisco.com]
> Sent: Tuesday, July 17, 2018 9:34 AM
> To: Uma Chunduri <uma.chunduri@huawei.com>; Ketan Talaulikar (ketant) <ketant@cisco.com>; lsr@ietf.org
> Cc: spring@ietf.org
> Subject: Re: [Lsr] Concerns with draft-chunduri-lsr-isis-preferred-path-routing
>
>
> 	> flex-algo is NOT a per path state. It's a regular prefix-SID, which is bound to a prefix only.
>
> Not quite. I will come back to this bit later.

please do so, as I don't know what do you mean by "Not quite".

>
> 	>The problem with your proposal is that you flood all paths to all routers in the area and ask every router to evaluate all of them and see which of them may apply. This scale poorly.
>
> Please see Section 6, in 01 version.

the section 6 points to a solution that does not exist as of yet. I can 
only comment once it is available, but the fact that you need an extra 
hooks to address the scalability just confirms the limited scaling 
property of the basic proposal.

thanks,
Peter

>
> --
> Uma C.
>
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr
> .
>


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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           : IS-IS Extensions for Segment Routing
        Authors         : Stefano Previdi
                          Les Ginsberg
                          Clarence Filsfils
                          Ahmed Bashandy
                          Hannes Gredler
                          Stephane Litkowski
                          Bruno Decraene
                          Jeff Tantsura
	Filename        : draft-ietf-isis-segment-routing-extensions-19.txt
	Pages           : 35
	Date            : 2018-07-19

Abstract:
   Segment Routing (SR) allows for a flexible definition of end-to-end
   paths within IGP topologies by encoding paths as sequences of
   topological sub-paths, called "segments".  These segments are
   advertised by the link-state routing protocols (IS-IS and OSPF).

   This draft describes the necessary IS-IS extensions that need to be
   introduced for Segment Routing operating on an MPLS data-plane.



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From: "Acee Lindem (acee)" <acee@cisco.com>
To: Uma Chunduri <umac.ietf@gmail.com>
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Thread-Topic: IPR Poll follow up on draft-ietf-isis-segment-routing-extensions-16
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Date: Sat, 21 Jul 2018 20:35:37 +0000
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Subject: [Lsr] FW: IPR Poll follow up on draft-ietf-isis-segment-routing-extensions-16
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From: Uma Chunduri <umac.ietf@gmail.com>
Date: Sun, 22 Jul 2018 18:07:42 -0700
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Subject: Re: [Lsr] FW: IPR Poll follow up on draft-ietf-isis-segment-routing-extensions-16
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Content-Type: text/plain; charset="UTF-8"

Sure, thx Acee.

Write-up has been updated to reflect on this (and few other things as
well).

Hope chairs can move this draft to the next stage.

--
Uma C.

On Sat, Jul 21, 2018 at 1:35 PM, Acee Lindem (acee) <acee@cisco.com> wrote:

> Hi Uma,
>
> Here is the response from Ed. Since things were hectic at IETF 102, I
> neglected to forward it to the list.
>
> Thanks,
>
> Acee
>
> *From: *Edward Crabbe <edward.crabbe@oracle.com>
> *Date: *Wednesday, July 18, 2018 at 7:56 PM
> *To: *Jeff Tantsura <jefftant@gmail.com>
> *Cc: *"draft-ietf-isis-segment-routing-extensions@ietf.org" <
> draft-ietf-isis-segment-routing-extensions@ietf.org>
> *Subject: *Re: IPR Poll follow up on draft-ietf-isis-segment-
> routing-extensions-16
> *Resent-From: *<alias-bounces@ietf.org>
> *Resent-To: *Acee Lindem <acee@cisco.com>, Christian Hopps <
> chopps@chopps.org>, Yingzhen Qu <yingzhen.qu@huawei.com>
> *Resent-Date: *Wednesday, July 18, 2018 at 7:57 PM
>
>
>
>
>
> Apologies for the dilatory response; apparently there is an issue with
> list mail on the account listed for this draft.
>
>
>
> I am not aware of any IPR related to this draft.
>
>
>
> On Jul 18, 2018, at 4:42 PM, Jeff Tantsura <jefftant@gmail.com> wrote:
>
>
>
> Please respond ASAP
>
>
>
>
>
> *From:* Uma Chunduri <umac.ietf@gmail.com>
> *Sent:* Tuesday, July 17, 2018 3:32 PM
> *To:* draft-ietf-isis-segment-routing-extensions@ietf.org
> *Cc:* lsr-chairs@ietf.org
> *Subject:* Re: IPR Poll follow up on draft-ietf-isis-segment-
> routing-extensions-16
>
>
>
> Dear Authors,
>
>
>
>
>
> Edward C. didn't respond his IPR response (despite multiple reminders).
>
>
>
> Per Chris one option is to try few more days (may be his mail ID changed
> and one of the authors can contact him)  or else  remove him from the
> contributors list to quickly move forward.
>
>
>
> Once that is done, I have to make small update in the write up (regarding
> the IPR poll status) and chairs can take the next steps.
>
>
>
> Best,
>
>
>
> --
>
> Uma C.
>
>
>
> On Fri, Jun 22, 2018 at 5:16 PM, Uma Chunduri <umac.ietf@gmail.com> wrote:
>
> Dear All,
>
>
>
> All authors have responded to the IPR Poll.
>
>
>
> Still couple of contributors (as listed) need to respond to the IPR Poll
>
>  - Martin H.
>
>  - Edward C.
>
>  - Rob S.
>
>  - Igor M.
>
> - Saku Y.
>
>
>
> Please respond to the LSR list thread.
>
>
>
> --
>
> Uma C.
>
>
>
> On Fri, Jun 15, 2018 at 9:16 AM, Uma Chunduri <umac.ietf@gmail.com> wrote:
>
> Still need one author's and couple of contributors response for the above
> subject.
>
>
>
> Please respond to  the LSR list thread.
>
>
>
> --
>
> Uma C.
>
>
>
>
>
>
>
>
>
>

--000000000000ce4bfe0571a04568
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<div dir=3D"ltr">Sure, thx Acee.<div><br></div><div>Write-up has been updat=
ed to reflect on this (and few other things as well).=C2=A0</div><div><br><=
/div><div>Hope chairs can move this=C2=A0draft=C2=A0to the next stage.</div=
><div><br></div><div>--</div><div>Uma C.</div></div><div class=3D"gmail_ext=
ra"><br><div class=3D"gmail_quote">On Sat, Jul 21, 2018 at 1:35 PM, Acee Li=
ndem (acee) <span dir=3D"ltr">&lt;<a href=3D"mailto:acee@cisco.com" target=
=3D"_blank">acee@cisco.com</a>&gt;</span> wrote:<br><blockquote class=3D"gm=
ail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-le=
ft:1ex">





<div lang=3D"EN-US" link=3D"blue" vlink=3D"purple">
<div class=3D"m_4891599366746661135WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt">Hi Uma, <u></u><u><=
/u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt">Here is the respons=
e from Ed. Since things were hectic at IETF 102, I neglected to forward it =
to the list.
<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt">Thanks,<u></u><u></=
u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt">Acee<u></u><u></u><=
/span></p>
<div style=3D"border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><b><span style=3D"font-si=
ze:12.0pt;color:black">From:
</span></b><span style=3D"font-size:12.0pt;color:black">Edward Crabbe &lt;<=
a href=3D"mailto:edward.crabbe@oracle.com" target=3D"_blank">edward.crabbe@=
oracle.com</a>&gt;<br>
<b>Date: </b>Wednesday, July 18, 2018 at 7:56 PM<br>
<b>To: </b>Jeff Tantsura &lt;<a href=3D"mailto:jefftant@gmail.com" target=
=3D"_blank">jefftant@gmail.com</a>&gt;<br>
<b>Cc: </b>&quot;<a href=3D"mailto:draft-ietf-isis-segment-routing-extensio=
ns@ietf.org" target=3D"_blank">draft-ietf-isis-segment-<wbr>routing-extensi=
ons@ietf.org</a>&quot; &lt;<a href=3D"mailto:draft-ietf-isis-segment-routin=
g-extensions@ietf.org" target=3D"_blank">draft-ietf-isis-segment-<wbr>routi=
ng-extensions@ietf.org</a>&gt;<span class=3D""><br>
<b>Subject: </b>Re: IPR Poll follow up on draft-ietf-isis-segment-<wbr>rout=
ing-extensions-16<br>
</span><span class=3D""><b>Resent-From: </b>&lt;<a href=3D"mailto:alias-bou=
nces@ietf.org" target=3D"_blank">alias-bounces@ietf.org</a>&gt;<br>
<b>Resent-To: </b>Acee Lindem &lt;<a href=3D"mailto:acee@cisco.com" target=
=3D"_blank">acee@cisco.com</a>&gt;, Christian Hopps &lt;<a href=3D"mailto:c=
hopps@chopps.org" target=3D"_blank">chopps@chopps.org</a>&gt;, Yingzhen Qu =
&lt;<a href=3D"mailto:yingzhen.qu@huawei.com" target=3D"_blank">yingzhen.qu=
@huawei.com</a>&gt;<br>
</span><b>Resent-Date: </b>Wednesday, July 18, 2018 at 7:57 PM<u></u><u></u=
></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><a name=3D"m_489159936674=
6661135__MailOriginalBody"><u></u>=C2=A0<u></u></a></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span>Apologies for the d=
ilatory response; apparently there is an issue with list mail on the accoun=
t listed for this draft.=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span><u></u>=C2=A0<u></u=
></span></p>
</div>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span>I am not aware of a=
ny IPR related to this draft.<u></u><u></u></span></p>
</div>
<p class=3D"MsoNormal" style=3D"margin-right:0in;margin-bottom:12.0pt;margi=
n-left:.5in">
<span><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span>On Jul 18, 2018, at=
 4:42 PM, Jeff Tantsura &lt;</span><a href=3D"mailto:jefftant@gmail.com" ta=
rget=3D"_blank"><span>jefftant@gmail.com</span><span></span></a><span>&gt;
 wrote:<u></u><u></u></span></p>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span><u></u>=C2=A0<u></u=
></span></p>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span>Please respond ASAP=
<u></u><u></u></span></p><div><div class=3D"h5">
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span><br>
<br>
<u></u><u></u></span></p>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span><u></u>=C2=A0<u></u=
></span></p>
</div>
<div>
<div>
<blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0i=
n 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in">
<div>
<div>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #e1e1e1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal" style=3D"margin-left:.5in">
<span><b>From:</b> Uma Chunduri &lt;</span><a href=3D"mailto:umac.ietf@gmai=
l.com" target=3D"_blank"><span>umac.ietf@gmail.com</span><span></span></a><=
span>&gt;
<br>
<b>Sent:</b> Tuesday, July 17, 2018 3:32 PM<br>
<b>To:</b> </span><a href=3D"mailto:draft-ietf-isis-segment-routing-extensi=
ons@ietf.org" target=3D"_blank"><span>draft-ietf-isis-segment-<wbr>routing-=
extensions@ietf.org</span><span></span></a><span><br>
<b>Cc:</b> </span><a href=3D"mailto:lsr-chairs@ietf.org" target=3D"_blank">=
<span>lsr-chairs@ietf.org</span><span></span></a><span><br>
<b>Subject:</b> Re: IPR Poll follow up on draft-ietf-isis-segment-<wbr>rout=
ing-extensions-16<u></u><u></u></span></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">
<span>=C2=A0<u></u><u></u></span></p>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">
<span>Dear Authors,<u></u><u></u></span></p>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">
<span>=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">
<span>=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">
<span>Edward C. didn&#39;t respond his IPR response (despite multiple remin=
ders).<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">
<span>=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">
<span>Per Chris one option is to try few more days (may be his mail ID chan=
ged and one of the authors can contact him)=C2=A0 or else=C2=A0 remove him =
from the contributors list to quickly move forward.<u></u><u></u></span></p=
>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">
<span>=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">
<span>Once that is done, I have to make small update in the write up (regar=
ding the IPR poll status) and chairs can take the next steps.<u></u><u></u>=
</span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">
<span>=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">
<span>Best,<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">
<span>=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">
<span>--<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">
<span>Uma C.<u></u><u></u></span></p>
</div>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">
<span>=C2=A0<u></u><u></u></span></p>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">
<span>On Fri, Jun 22, 2018 at 5:16 PM, Uma Chunduri &lt;</span><a href=3D"m=
ailto:umac.ietf@gmail.com" target=3D"_blank"><span>umac.ietf@gmail.com</spa=
n><span></span></a><span>&gt;
 wrote:<u></u><u></u></span></p>
<blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0i=
n 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-=
bottom:5.0pt">
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">
<span>Dear All,<u></u><u></u></span></p>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">
<span>=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">
<span>All authors have responded to the IPR Poll.<u></u><u></u></span></p>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">
<span>=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">
<span>Still couple of contributors (as listed) need to respond to the IPR P=
oll=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">
<span>=C2=A0- Martin H.<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">
<span>=C2=A0- Edward C.<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">
<span>=C2=A0- Rob S.<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">
<span>=C2=A0- Igor M.<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">
<span>- Saku Y.<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">
<span>=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">
<span>Please respond to the LSR list thread.<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">
<span>=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">
<span>--<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">
<span>Uma C.<u></u><u></u></span></p>
</div>
<div>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">
<span>=C2=A0<u></u><u></u></span></p>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">
<span>On Fri, Jun 15, 2018 at 9:16 AM, Uma Chunduri &lt;</span><a href=3D"m=
ailto:umac.ietf@gmail.com" target=3D"_blank"><span>umac.ietf@gmail.com</spa=
n><span></span></a><span>&gt;
 wrote:<u></u><u></u></span></p>
<blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0i=
n 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-=
bottom:5.0pt">
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">
<span>Still need one author&#39;s and couple of contributors response for t=
he above subject.<u></u><u></u></span></p>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">
<span>=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">
<span>Please respond to=C2=A0 the LSR list thread.<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">
<span>=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">
<span>--<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">
<span>Uma C.<u></u><u></u></span></p>
</div>
</div>
</blockquote>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">
<span>=C2=A0<u></u><u></u></span></p>
</div>
</div>
</div>
</div>
</div>
</blockquote>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">
<span>=C2=A0<u></u><u></u></span></p>
</div>
</div>
</div>
</div>
</blockquote>
</div>
</div>
</blockquote>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span><u></u>=C2=A0<u></u=
></span></p>
</div></div></div>
</div>
</blockquote>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span><br>
<br>
</span><u></u><u></u></p>
</div>
</div>

</blockquote></div><br></div>

--000000000000ce4bfe0571a04568--


From nobody Mon Jul 23 00:49:37 2018
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From: "Aijun Wang" <wangaijun@tsinghua.org.cn>
To: "'Peter Psenak'" <ppsenak@cisco.com>, <chopps@chopps.org>
Cc: <lsr@ietf.org>, "'Acee Lindem \(acee\)'" <acee@cisco.com>, "'Ketan Talaulikar \(ketant\)'" <ketant@cisco.com>, "'Dongjie \(Jimmy\)'" <jie.dong@huawei.com>
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Subject: [Lsr] Regarding OSPF extension for inter-area topology retrieval
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(Sorry for my previous mail sent wrongly to the IDR mail list, please reply
on this thread within the LSR wg)

 

Hi, Peter:

 

I am Aijun Wang from China Telecom, the author of draft about
<https://datatracker.ietf.org/doc/draft-wang-lsr-ospf-inter-area-topology-ex
t/> "OSPF extension for inter-area topology retrieval", which is presented
by Mr.Jie Dong during the IETF102 meeting.

Thanks for your comments on the presentation material
<https://datatracker.ietf.org/meeting/102/materials/slides-102-lsr-ospf-inte
r-area-topology-retrieval-00> .

Below are my explanation that regarding to the question about "how it
retrievals the inter-area topology based on the extension information":

 

Let's see the graph that illustrates in Fig.1 at section 3
<https://tools.ietf.org/html/draft-wang-lsr-ospf-inter-area-topology-ext-00#
section-3>  of the draft(I copy it also below for your conveniences ):

 



 

Assuming we want to rebuild the connection between router S1 and router S2
that locates in area 1:

1)       Normally, router S1 will advertise prefix N1 within its router LSA

2)       When this router LSA reaches the ABR router R1, it will convert it
into summary LSA, add the "Source Router Information", which is router id of
S1 in this example, as proposed in this draft.

3)       R1 then floods this extension summary LSA to R0, which is running
BGP-LS protocol with IP SDN Controller. The controller then knows the
prefixes of N1 is from S1.

4)       Router S2 will do the similar process, and the controller will also
knows the prefixes N1 is also from S2

5)       Then it can reconstruct the connection between S1 and S2, which
prefix is N1. The topology within Area 1 can then be recovered accordingly.


 

Does the above explanation can answer your question. if so, I can add it
into the context of this draft in updated version.

 

 

Best Regards.

 

Aijun Wang

Network R&D and Operation Support Department

China Telecom Corporation Limited Beijing Research Institute,Beijing, China.

 

 


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vlink=3Dpurple style=3D'text-justify-trim:punctuation'><div =
class=3DWordSection1><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#1F497D'>(Sorry for my previous mail sent wrongly to the =
IDR mail list, please reply on this thread within the LSR =
wg)<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US>Hi, Peter:<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US>I am Aijun Wang from China Telecom, =
the author of draft about <a =
href=3D"https://datatracker.ietf.org/doc/draft-wang-lsr-ospf-inter-area-t=
opology-ext/">&#8220;OSPF extension for inter-area topology =
retrieval&#8221;</a>, which is presented by Mr.Jie Dong during the =
IETF102 meeting.<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US>Thanks for your comments on the <a =
href=3D"https://datatracker.ietf.org/meeting/102/materials/slides-102-lsr=
-ospf-inter-area-topology-retrieval-00">presentation =
material</a>.<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US>Below are my explanation that regarding to the question =
about &#8220;how it retrievals the inter-area topology based on the =
extension information&#8221;:<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US>Let&#8217;s see the graph that =
illustrates in Fig.1 at <a =
href=3D"https://tools.ietf.org/html/draft-wang-lsr-ospf-inter-area-topolo=
gy-ext-00#section-3">section 3</a> of the draft(I copy it also below for =
your conveniences ):<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US><img border=3D0 width=3D547 height=3D338 =
id=3D"_x56fe__x7247__x0020_2" =
src=3D"cid:image001.png@01D42297.74CBB3E0"><o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US>Assuming we want to rebuild the =
connection between router S1 and router S2 that locates in area =
1:<o:p></o:p></span></p><p class=3DMsoListParagraph =
style=3D'margin-left:18.0pt;text-indent:-18.0pt;mso-list:l0 level1 =
lfo2'><![if !supportLists]><span lang=3DEN-US><span =
style=3D'mso-list:Ignore'>1)<span style=3D'font:7.0pt "Times New =
Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
</span></span></span><![endif]><span lang=3DEN-US>Normally, router S1 =
will advertise prefix N1 within its router LSA<o:p></o:p></span></p><p =
class=3DMsoListParagraph =
style=3D'margin-left:18.0pt;text-indent:-18.0pt;mso-list:l0 level1 =
lfo2'><![if !supportLists]><span lang=3DEN-US><span =
style=3D'mso-list:Ignore'>2)<span style=3D'font:7.0pt "Times New =
Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
</span></span></span><![endif]><span lang=3DEN-US>When this router LSA =
reaches the ABR router R1, it will convert it into summary LSA, add the =
&#8220;Source Router Information&#8221;, which is router id of S1 in =
this example, as proposed in this draft.<o:p></o:p></span></p><p =
class=3DMsoListParagraph =
style=3D'margin-left:18.0pt;text-indent:-18.0pt;mso-list:l0 level1 =
lfo2'><![if !supportLists]><span lang=3DEN-US><span =
style=3D'mso-list:Ignore'>3)<span style=3D'font:7.0pt "Times New =
Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
</span></span></span><![endif]><span lang=3DEN-US>R1 then floods this =
extension summary LSA to R0, which is running BGP-LS protocol with IP =
SDN Controller. The controller then knows the prefixes of N1 is from =
S1.<o:p></o:p></span></p><p class=3DMsoListParagraph =
style=3D'margin-left:18.0pt;text-indent:-18.0pt;mso-list:l0 level1 =
lfo2'><![if !supportLists]><span lang=3DEN-US><span =
style=3D'mso-list:Ignore'>4)<span style=3D'font:7.0pt "Times New =
Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
</span></span></span><![endif]><span lang=3DEN-US>Router S2 will do the =
similar process, and the controller will also knows the prefixes N1 is =
also from S2<o:p></o:p></span></p><p class=3DMsoListParagraph =
style=3D'margin-left:18.0pt;text-indent:-18.0pt;mso-list:l0 level1 =
lfo2'><![if !supportLists]><span lang=3DEN-US><span =
style=3D'mso-list:Ignore'>5)<span style=3D'font:7.0pt "Times New =
Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
</span></span></span><![endif]><span lang=3DEN-US>Then it can =
reconstruct the connection between S1 and S2, which prefix is N1. The =
topology within Area 1 can then be recovered accordingly. =
&nbsp;&nbsp;<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US>Does the above explanation can answer your question. if so, =
I can add it into the context of this draft in updated =
version.<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US>Best Regards.<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US>Aijun Wang<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US>Network R&amp;D and Operation =
Support Department<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US>China Telecom Corporation Limited Beijing Research =
Institute,Beijing, China.<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p></div></body></html>
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Subject: Re: [Lsr] Regarding OSPF extension for inter-area topology retrieval
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Hi Aijun,

you are trying to reconstruct the topology of the remote area based on 
the fact that two routers are connected to the same subnet. It does not 
work because:

1. connections between routers can be unnumbered
2. routers can be connected via LAN, in which case only DR announces the 
prefix.

In summary, what you propose does not work.

thanks,
Peter



On 23/07/18 09:49 , Aijun Wang wrote:
> (Sorry for my previous mail sent wrongly to the IDR mail list, please
> reply on this thread within the LSR wg)
>
> Hi, Peter:
>
> I am Aijun Wang from China Telecom, the author of draft about “OSPF
> extension for inter-area topology retrieval”
> <https://datatracker.ietf.org/doc/draft-wang-lsr-ospf-inter-area-topology-ext/>,
> which is presented by Mr.Jie Dong during the IETF102 meeting.
>
> Thanks for your comments on the presentation material
> <https://datatracker.ietf.org/meeting/102/materials/slides-102-lsr-ospf-inter-area-topology-retrieval-00>.
>
> Below are my explanation that regarding to the question about “how it
> retrievals the inter-area topology based on the extension information”:
>
> Let’s see the graph that illustrates in Fig.1 at section 3
> <https://tools.ietf.org/html/draft-wang-lsr-ospf-inter-area-topology-ext-00#section-3>
> of the draft(I copy it also below for your conveniences ):
>
> Assuming we want to rebuild the connection between router S1 and router
> S2 that locates in area 1:
>
> 1)Normally, router S1 will advertise prefix N1 within its router LSA
>
> 2)When this router LSA reaches the ABR router R1, it will convert it
> into summary LSA, add the “Source Router Information”, which is router
> id of S1 in this example, as proposed in this draft.
>
> 3)R1 then floods this extension summary LSA to R0, which is running
> BGP-LS protocol with IP SDN Controller. The controller then knows the
> prefixes of N1 is from S1.
>
> 4)Router S2 will do the similar process, and the controller will also
> knows the prefixes N1 is also from S2
>
> 5)Then it can reconstruct the connection between S1 and S2, which prefix
> is N1. The topology within Area 1 can then be recovered accordingly.
>
> Does the above explanation can answer your question. if so, I can add it
> into the context of this draft in updated version.
>
> Best Regards.
>
> Aijun Wang
>
> Network R&D and Operation Support Department
>
> China Telecom Corporation Limited Beijing Research Institute,Beijing, China.
>


From nobody Mon Jul 23 02:16:32 2018
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To: "'Peter Psenak'" <ppsenak=40cisco.com@dmarc.ietf.org>, <chopps@chopps.org>
Cc: <lsr@ietf.org>, "'Ketan Talaulikar \(ketant\)'" <ketant@cisco.com>, "'Acee Lindem \(acee\)'" <acee@cisco.com>, "'Dongjie \(Jimmy\)'" <jie.dong@huawei.com>
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Hi, Peter:

Actually, I consider mainly the point-to-point connection and the =
numbered
interface, which are normal in our network.
For the two situations that you mentioned, I will investigation the =
possible
solutions and feedback you later.

For the point-to-point and numbered interface, do you have other =
questions
then?

Best Regards.

Aijun Wang
Network R&D and Operation Support Department
China Telecom Corporation Limited Beijing Research Institute,Beijing, =
China.

-----=D3=CA=BC=FE=D4=AD=BC=FE-----
=B7=A2=BC=FE=C8=CB: Peter Psenak =
[mailto:ppsenak=3D40cisco.com@dmarc.ietf.org]=20
=B7=A2=CB=CD=CA=B1=BC=E4: 2018=C4=EA7=D4=C223=C8=D5 16:15
=CA=D5=BC=FE=C8=CB: Aijun Wang; chopps@chopps.org
=B3=AD=CB=CD: lsr@ietf.org; 'Ketan Talaulikar (ketant)'; 'Acee Lindem =
(acee)';
'Dongjie (Jimmy)'
=D6=F7=CC=E2: Re: [Lsr] Regarding OSPF extension for inter-area topology =
retrieval

Hi Aijun,

you are trying to reconstruct the topology of the remote area based on =
the
fact that two routers are connected to the same subnet. It does not work
because:

1. connections between routers can be unnumbered 2. routers can be =
connected
via LAN, in which case only DR announces the prefix.

In summary, what you propose does not work.

thanks,
Peter



On 23/07/18 09:49 , Aijun Wang wrote:
> (Sorry for my previous mail sent wrongly to the IDR mail list, please=20
> reply on this thread within the LSR wg)
>
> Hi, Peter:
>
> I am Aijun Wang from China Telecom, the author of draft about =
=A1=B0OSPF=20
> extension for inter-area topology retrieval=A1=B1
> <https://datatracker.ietf.org/doc/draft-wang-lsr-ospf-inter-area-topol
> ogy-ext/>, which is presented by Mr.Jie Dong during the IETF102=20
> meeting.
>
> Thanks for your comments on the presentation material=20
>
<https://datatracker.ietf.org/meeting/102/materials/slides-102-lsr-ospf-i=
nte
r-area-topology-retrieval-00>.
>
> Below are my explanation that regarding to the question about =
=A1=B0how it=20
> retrievals the inter-area topology based on the extension =
information=A1=B1:
>
> Let=A1=AFs see the graph that illustrates in Fig.1 at section 3=20
> <https://tools.ietf.org/html/draft-wang-lsr-ospf-inter-area-topology-e
> xt-00#section-3> of the draft(I copy it also below for your=20
> conveniences ):
>
> Assuming we want to rebuild the connection between router S1 and=20
> router
> S2 that locates in area 1:
>
> 1)Normally, router S1 will advertise prefix N1 within its router LSA
>
> 2)When this router LSA reaches the ABR router R1, it will convert it=20
> into summary LSA, add the =A1=B0Source Router Information=A1=B1, which =
is router=20
> id of S1 in this example, as proposed in this draft.
>
> 3)R1 then floods this extension summary LSA to R0, which is running=20
> BGP-LS protocol with IP SDN Controller. The controller then knows the=20
> prefixes of N1 is from S1.
>
> 4)Router S2 will do the similar process, and the controller will also=20
> knows the prefixes N1 is also from S2
>
> 5)Then it can reconstruct the connection between S1 and S2, which=20
> prefix is N1. The topology within Area 1 can then be recovered
accordingly.
>
> Does the above explanation can answer your question. if so, I can add=20
> it into the context of this draft in updated version.
>
> Best Regards.
>
> Aijun Wang
>
> Network R&D and Operation Support Department
>
> China Telecom Corporation Limited Beijing Research Institute,Beijing,
China.
>

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


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Hi Aijun,

On 23/07/18 11:16 , Aijun Wang wrote:
> Hi, Peter:
> 
> Actually, I consider mainly the point-to-point connection and the numbered
> interface, which are normal in our network.
> For the two situations that you mentioned, I will investigation the possible
> solutions and feedback you later.
> 
> For the point-to-point and numbered interface, do you have other questions
> then?

the fact that two routers announce the same subnet, does not mean they
are connected together by p2p link. Anycast prefix is an example.

The idea you are proposing simply does not work.

thanks,
Peter


> 
> Best Regards.
> 
> Aijun Wang
> Network R&D and Operation Support Department
> China Telecom Corporation Limited Beijing Research Institute,Beijing, China.
> 
> -----ÓÊ¼þÔ­¼þ-----
> ·¢¼þÈË: Peter Psenak [mailto:ppsenak=40cisco.com@dmarc.ietf.org]
> ·¢ËÍÊ±¼ä: 2018Äê7ÔÂ23ÈÕ 16:15
> ÊÕ¼þÈË: Aijun Wang; chopps@chopps.org
> ³­ËÍ: lsr@ietf.org; 'Ketan Talaulikar (ketant)'; 'Acee Lindem (acee)';
> 'Dongjie (Jimmy)'
> Ö÷Ìâ: Re: [Lsr] Regarding OSPF extension for inter-area topology retrieval
> 
> Hi Aijun,
> 
> you are trying to reconstruct the topology of the remote area based on the
> fact that two routers are connected to the same subnet. It does not work
> because:
> 
> 1. connections between routers can be unnumbered 2. routers can be connected
> via LAN, in which case only DR announces the prefix.
> 
> In summary, what you propose does not work.
> 
> thanks,
> Peter
> 
> 
> 
> On 23/07/18 09:49 , Aijun Wang wrote:
>> (Sorry for my previous mail sent wrongly to the IDR mail list, please
>> reply on this thread within the LSR wg)
>>
>> Hi, Peter:
>>
>> I am Aijun Wang from China Telecom, the author of draft about ¡°OSPF
>> extension for inter-area topology retrieval¡±
>> <https://datatracker.ietf.org/doc/draft-wang-lsr-ospf-inter-area-topol
>> ogy-ext/>, which is presented by Mr.Jie Dong during the IETF102
>> meeting.
>>
>> Thanks for your comments on the presentation material
>>
> <https://datatracker.ietf.org/meeting/102/materials/slides-102-lsr-ospf-inte
> r-area-topology-retrieval-00>.
>>
>> Below are my explanation that regarding to the question about ¡°how it
>> retrievals the inter-area topology based on the extension information¡±:
>>
>> Let¡¯s see the graph that illustrates in Fig.1 at section 3
>> <https://tools.ietf.org/html/draft-wang-lsr-ospf-inter-area-topology-e
>> xt-00#section-3> of the draft(I copy it also below for your
>> conveniences ):
>>
>> Assuming we want to rebuild the connection between router S1 and
>> router
>> S2 that locates in area 1:
>>
>> 1)Normally, router S1 will advertise prefix N1 within its router LSA
>>
>> 2)When this router LSA reaches the ABR router R1, it will convert it
>> into summary LSA, add the ¡°Source Router Information¡±, which is router
>> id of S1 in this example, as proposed in this draft.
>>
>> 3)R1 then floods this extension summary LSA to R0, which is running
>> BGP-LS protocol with IP SDN Controller. The controller then knows the
>> prefixes of N1 is from S1.
>>
>> 4)Router S2 will do the similar process, and the controller will also
>> knows the prefixes N1 is also from S2
>>
>> 5)Then it can reconstruct the connection between S1 and S2, which
>> prefix is N1. The topology within Area 1 can then be recovered
> accordingly.
>>
>> Does the above explanation can answer your question. if so, I can add
>> it into the context of this draft in updated version.
>>
>> Best Regards.
>>
>> Aijun Wang
>>
>> Network R&D and Operation Support Department
>>
>> China Telecom Corporation Limited Beijing Research Institute,Beijing,
> China.
>>
> 
> _______________________________________________
> 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
> 


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From: "Aijun Wang" <wangaijun@tsinghua.org.cn>
To: "'Peter Psenak'" <ppsenak=40cisco.com@dmarc.ietf.org>, <chopps@chopps.org>
Cc: <lsr@ietf.org>, "'Ketan Talaulikar \(ketant\)'" <ketant@cisco.com>, "'Acee Lindem \(acee\)'" <acee@cisco.com>, "'Dongjie \(Jimmy\)'" <jie.dong@huawei.com>
References: <001601d42259$a860fff0$f922ffd0$@org.cn> <5B558E76.3010703@cisco.com> <003201d42265$cd011af0$670350d0$@org.cn> <5B55ABB5.60806@cisco.com>
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Hi, Peter:

For routers that connected by LAN, the router will establish adjacent
neighbor with DR, but not only DR advertises the connected prefixes. DR =
and
DRother will all advertise type 1 and type 2 LSA with each other, then =
the
process and proposal described in this draft will still work.
We seldom use the ip unnumbered features in our network, can we ignore =
it
then? Or other persons has some idea on such situation?
Anycast prefixes are often /32 long, this can be easily filtered by SDN
controller because the link prefixes between two routers will be no =
larger
than /32 for IPv4 network.

Best Regards.

Aijun Wang
Network R&D and Operation Support Department
China Telecom Corporation Limited Beijing Research Institute,Beijing, =
China.

-----=D3=CA=BC=FE=D4=AD=BC=FE-----
=B7=A2=BC=FE=C8=CB: Peter Psenak =
[mailto:ppsenak=3D40cisco.com@dmarc.ietf.org]=20
=B7=A2=CB=CD=CA=B1=BC=E4: 2018=C4=EA7=D4=C223=C8=D5 18:20
=CA=D5=BC=FE=C8=CB: Aijun Wang; 'Peter Psenak'; chopps@chopps.org
=B3=AD=CB=CD: lsr@ietf.org; 'Ketan Talaulikar (ketant)'; 'Acee Lindem =
(acee)';
'Dongjie (Jimmy)'
=D6=F7=CC=E2: Re: [Lsr] =B4=F0=B8=B4: Regarding OSPF extension for =
inter-area topology
retrieval

Hi Aijun,

On 23/07/18 11:16 , Aijun Wang wrote:
> Hi, Peter:
>=20
> Actually, I consider mainly the point-to-point connection and the=20
> numbered interface, which are normal in our network.
> For the two situations that you mentioned, I will investigation the=20
> possible solutions and feedback you later.
>=20
> For the point-to-point and numbered interface, do you have other=20
> questions then?

the fact that two routers announce the same subnet, does not mean they =
are
connected together by p2p link. Anycast prefix is an example.

The idea you are proposing simply does not work.

thanks,
Peter


>=20
> Best Regards.
>=20
> Aijun Wang
> Network R&D and Operation Support Department China Telecom Corporation =

> Limited Beijing Research Institute,Beijing, China.
>=20
> -----=D3=CA=BC=FE=D4=AD=BC=FE-----
> =B7=A2=BC=FE=C8=CB: Peter Psenak =
[mailto:ppsenak=3D40cisco.com@dmarc.ietf.org]
> =B7=A2=CB=CD=CA=B1=BC=E4: 2018=C4=EA7=D4=C223=C8=D5 16:15
> =CA=D5=BC=FE=C8=CB: Aijun Wang; chopps@chopps.org
> =B3=AD=CB=CD: lsr@ietf.org; 'Ketan Talaulikar (ketant)'; 'Acee Lindem =
(acee)';=20
> 'Dongjie (Jimmy)'
> =D6=F7=CC=E2: Re: [Lsr] Regarding OSPF extension for inter-area =
topology=20
> retrieval
>=20
> Hi Aijun,
>=20
> you are trying to reconstruct the topology of the remote area based on =

> the fact that two routers are connected to the same subnet. It does=20
> not work
> because:
>=20
> 1. connections between routers can be unnumbered 2. routers can be=20
> connected via LAN, in which case only DR announces the prefix.
>=20
> In summary, what you propose does not work.
>=20
> thanks,
> Peter
>=20
>=20
>=20
> On 23/07/18 09:49 , Aijun Wang wrote:
>> (Sorry for my previous mail sent wrongly to the IDR mail list, please =

>> reply on this thread within the LSR wg)
>>
>> Hi, Peter:
>>
>> I am Aijun Wang from China Telecom, the author of draft about =
=A1=B0OSPF=20
>> extension for inter-area topology retrieval=A1=B1
>> <https://datatracker.ietf.org/doc/draft-wang-lsr-ospf-inter-area-topo
>> l ogy-ext/>, which is presented by Mr.Jie Dong during the IETF102=20
>> meeting.
>>
>> Thanks for your comments on the presentation material
>>
> <https://datatracker.ietf.org/meeting/102/materials/slides-102-lsr-osp
> f-inte
> r-area-topology-retrieval-00>.
>>
>> Below are my explanation that regarding to the question about =
=A1=B0how it=20
>> retrievals the inter-area topology based on the extension =
information=A1=B1:
>>
>> Let=A1=AFs see the graph that illustrates in Fig.1 at section 3=20
>> <https://tools.ietf.org/html/draft-wang-lsr-ospf-inter-area-topology-
>> e xt-00#section-3> of the draft(I copy it also below for your=20
>> conveniences ):
>>
>> Assuming we want to rebuild the connection between router S1 and=20
>> router
>> S2 that locates in area 1:
>>
>> 1)Normally, router S1 will advertise prefix N1 within its router LSA
>>
>> 2)When this router LSA reaches the ABR router R1, it will convert it=20
>> into summary LSA, add the =A1=B0Source Router Information=A1=B1, =
which is=20
>> router id of S1 in this example, as proposed in this draft.
>>
>> 3)R1 then floods this extension summary LSA to R0, which is running=20
>> BGP-LS protocol with IP SDN Controller. The controller then knows the =

>> prefixes of N1 is from S1.
>>
>> 4)Router S2 will do the similar process, and the controller will also =

>> knows the prefixes N1 is also from S2
>>
>> 5)Then it can reconstruct the connection between S1 and S2, which=20
>> prefix is N1. The topology within Area 1 can then be recovered
> accordingly.
>>
>> Does the above explanation can answer your question. if so, I can add =

>> it into the context of this draft in updated version.
>>
>> Best Regards.
>>
>> Aijun Wang
>>
>> Network R&D and Operation Support Department
>>
>> China Telecom Corporation Limited Beijing Research Institute,Beijing,
> China.
>>
>=20
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr
>=20
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr
>=20

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


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References: <001601d42259$a860fff0$f922ffd0$@org.cn> <5B558E76.3010703@cisco.com> <003201d42265$cd011af0$670350d0$@org.cn> <5B55ABB5.60806@cisco.com> <003f01d42275$5ec00eb0$1c402c10$@org.cn>
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Hi Aijun,

On 23/07/18 13:07 , Aijun Wang wrote:
> Hi, Peter:
> 
> For routers that connected by LAN, the router will establish adjacent
> neighbor with DR, but not only DR advertises the connected prefixes. 

only the Network LSA includes the network mask, other routers would
include the interface address only.


> DR and
> DRother will all advertise type 1 and type 2 LSA with each other, then the
> process and proposal described in this draft will still work.
> We seldom use the ip unnumbered features in our network, can we ignore it
> then? Or other persons has some idea on such situation?

the fact that you do not use unnumbered is not really relevant. IETF
defines solutions that MUST work for all possible scenarios, not only
for a specific one.

> Anycast prefixes are often /32 long, this can be easily filtered by SDN
> controller because the link prefixes between two routers will be no larger
> than /32 for IPv4 network.

protocol allows to advertise the same prefix with an arbitrary mask from
multiple routers without these routers being directly connected. Your
proposal is based on the assumptions that are incorrect.

thanks,
Peter

> 
> Best Regards.
> 
> Aijun Wang
> Network R&D and Operation Support Department
> China Telecom Corporation Limited Beijing Research Institute,Beijing, China.
> 
> -----ÓÊ¼þÔ­¼þ-----
> ·¢¼þÈË: Peter Psenak [mailto:ppsenak=40cisco.com@dmarc.ietf.org]
> ·¢ËÍÊ±¼ä: 2018Äê7ÔÂ23ÈÕ 18:20
> ÊÕ¼þÈË: Aijun Wang; 'Peter Psenak'; chopps@chopps.org
> ³­ËÍ: lsr@ietf.org; 'Ketan Talaulikar (ketant)'; 'Acee Lindem (acee)';
> 'Dongjie (Jimmy)'
> Ö÷Ìâ: Re: [Lsr] ´ð¸´: Regarding OSPF extension for inter-area topology
> retrieval
> 
> Hi Aijun,
> 
> On 23/07/18 11:16 , Aijun Wang wrote:
>> Hi, Peter:
>>
>> Actually, I consider mainly the point-to-point connection and the
>> numbered interface, which are normal in our network.
>> For the two situations that you mentioned, I will investigation the
>> possible solutions and feedback you later.
>>
>> For the point-to-point and numbered interface, do you have other
>> questions then?
> 
> the fact that two routers announce the same subnet, does not mean they are
> connected together by p2p link. Anycast prefix is an example.
> 
> The idea you are proposing simply does not work.
> 
> thanks,
> Peter
> 
> 
>>
>> Best Regards.
>>
>> Aijun Wang
>> Network R&D and Operation Support Department China Telecom Corporation
>> Limited Beijing Research Institute,Beijing, China.
>>
>> -----ÓÊ¼þÔ­¼þ-----
>> ·¢¼þÈË: Peter Psenak [mailto:ppsenak=40cisco.com@dmarc.ietf.org]
>> ·¢ËÍÊ±¼ä: 2018Äê7ÔÂ23ÈÕ 16:15
>> ÊÕ¼þÈË: Aijun Wang; chopps@chopps.org
>> ³­ËÍ: lsr@ietf.org; 'Ketan Talaulikar (ketant)'; 'Acee Lindem (acee)';
>> 'Dongjie (Jimmy)'
>> Ö÷Ìâ: Re: [Lsr] Regarding OSPF extension for inter-area topology
>> retrieval
>>
>> Hi Aijun,
>>
>> you are trying to reconstruct the topology of the remote area based on
>> the fact that two routers are connected to the same subnet. It does
>> not work
>> because:
>>
>> 1. connections between routers can be unnumbered 2. routers can be
>> connected via LAN, in which case only DR announces the prefix.
>>
>> In summary, what you propose does not work.
>>
>> thanks,
>> Peter
>>
>>
>>
>> On 23/07/18 09:49 , Aijun Wang wrote:
>>> (Sorry for my previous mail sent wrongly to the IDR mail list, please
>>> reply on this thread within the LSR wg)
>>>
>>> Hi, Peter:
>>>
>>> I am Aijun Wang from China Telecom, the author of draft about ¡°OSPF
>>> extension for inter-area topology retrieval¡±
>>> <https://datatracker.ietf.org/doc/draft-wang-lsr-ospf-inter-area-topo
>>> l ogy-ext/>, which is presented by Mr.Jie Dong during the IETF102
>>> meeting.
>>>
>>> Thanks for your comments on the presentation material
>>>
>> <https://datatracker.ietf.org/meeting/102/materials/slides-102-lsr-osp
>> f-inte
>> r-area-topology-retrieval-00>.
>>>
>>> Below are my explanation that regarding to the question about ¡°how it
>>> retrievals the inter-area topology based on the extension information¡±:
>>>
>>> Let¡¯s see the graph that illustrates in Fig.1 at section 3
>>> <https://tools.ietf.org/html/draft-wang-lsr-ospf-inter-area-topology-
>>> e xt-00#section-3> of the draft(I copy it also below for your
>>> conveniences ):
>>>
>>> Assuming we want to rebuild the connection between router S1 and
>>> router
>>> S2 that locates in area 1:
>>>
>>> 1)Normally, router S1 will advertise prefix N1 within its router LSA
>>>
>>> 2)When this router LSA reaches the ABR router R1, it will convert it
>>> into summary LSA, add the ¡°Source Router Information¡±, which is
>>> router id of S1 in this example, as proposed in this draft.
>>>
>>> 3)R1 then floods this extension summary LSA to R0, which is running
>>> BGP-LS protocol with IP SDN Controller. The controller then knows the
>>> prefixes of N1 is from S1.
>>>
>>> 4)Router S2 will do the similar process, and the controller will also
>>> knows the prefixes N1 is also from S2
>>>
>>> 5)Then it can reconstruct the connection between S1 and S2, which
>>> prefix is N1. The topology within Area 1 can then be recovered
>> accordingly.
>>>
>>> Does the above explanation can answer your question. if so, I can add
>>> it into the context of this draft in updated version.
>>>
>>> Best Regards.
>>>
>>> Aijun Wang
>>>
>>> Network R&D and Operation Support Department
>>>
>>> China Telecom Corporation Limited Beijing Research Institute,Beijing,
>> China.
>>>
>>
>> _______________________________________________
>> 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
> 
> .
> 


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From: Rob Shakir <rjs@rob.sh>
Date: Mon, 23 Jul 2018 19:03:48 -0400
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To: Peter Psenak <ppsenak=40cisco.com@dmarc.ietf.org>
Cc: Aijun Wang <wangaijun@tsinghua.org.cn>, chopps@chopps.org, lsr@ietf.org,  "Ketan Talaulikar (ketant)" <ketant@cisco.com>, "Acee Lindem (acee)" <acee@cisco.com>,  "Dongjie (Jimmy)" <jie.dong@huawei.com>
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Subject: Re: [Lsr]  =?utf-8?b?562U5aSNOiDnrZTlpI06IFJlZ2FyZGluZyBPU1BGIGV4dGVu?= =?utf-8?q?sion_for_inter-area_topology_retrieval?=
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+1 to Peter. We should not define fragile solutions within the IETF.

There are also a multitude of other solutions here already:

1) IGP adjacency with one router in each area (at a minimum - probably two
for a robust system) over a tunnel. Deployed in many networks for years.
2) BGP-LS to one router (ditto robustness comment) in each area.
3) streaming telemetry of the LSDB contents via gNMI.

All these solutions exist in shipping implementations - please let=E2=80=99=
s not
add to the system complexity of the IGP here.

r.
On Mon, Jul 23, 2018 at 12:30 Peter Psenak <ppsenak=3D
40cisco.com@dmarc.ietf.org> wrote:

> Hi Aijun,
>
> On 23/07/18 13:07 , Aijun Wang wrote:
> > Hi, Peter:
> >
> > For routers that connected by LAN, the router will establish adjacent
> > neighbor with DR, but not only DR advertises the connected prefixes.
>
> only the Network LSA includes the network mask, other routers would
> include the interface address only.
>
>
> > DR and
> > DRother will all advertise type 1 and type 2 LSA with each other, then
> the
> > process and proposal described in this draft will still work.
> > We seldom use the ip unnumbered features in our network, can we ignore =
it
> > then? Or other persons has some idea on such situation?
>
> the fact that you do not use unnumbered is not really relevant. IETF
> defines solutions that MUST work for all possible scenarios, not only
> for a specific one.
>
> > Anycast prefixes are often /32 long, this can be easily filtered by SDN
> > controller because the link prefixes between two routers will be no
> larger
> > than /32 for IPv4 network.
>
> protocol allows to advertise the same prefix with an arbitrary mask from
> multiple routers without these routers being directly connected. Your
> proposal is based on the assumptions that are incorrect.
>
> thanks,
> Peter
>
> >
> > Best Regards.
> >
> > Aijun Wang
> > Network R&D and Operation Support Department
> > China Telecom Corporation Limited Beijing Research Institute,Beijing,
> China.
> >
> > -----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6-----
> > =E5=8F=91=E4=BB=B6=E4=BA=BA: Peter Psenak [mailto:ppsenak=3D40cisco.com=
@dmarc.ietf.org]
> > =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2018=E5=B9=B47=E6=9C=8823=E6=97=
=A5 18:20
> > =E6=94=B6=E4=BB=B6=E4=BA=BA: Aijun Wang; 'Peter Psenak'; chopps@chopps.=
org
> > =E6=8A=84=E9=80=81: lsr@ietf.org; 'Ketan Talaulikar (ketant)'; 'Acee Li=
ndem (acee)';
> > 'Dongjie (Jimmy)'
> > =E4=B8=BB=E9=A2=98: Re: [Lsr] =E7=AD=94=E5=A4=8D: Regarding OSPF extens=
ion for inter-area topology
> > retrieval
> >
> > Hi Aijun,
> >
> > On 23/07/18 11:16 , Aijun Wang wrote:
> >> Hi, Peter:
> >>
> >> Actually, I consider mainly the point-to-point connection and the
> >> numbered interface, which are normal in our network.
> >> For the two situations that you mentioned, I will investigation the
> >> possible solutions and feedback you later.
> >>
> >> For the point-to-point and numbered interface, do you have other
> >> questions then?
> >
> > the fact that two routers announce the same subnet, does not mean they
> are
> > connected together by p2p link. Anycast prefix is an example.
> >
> > The idea you are proposing simply does not work.
> >
> > thanks,
> > Peter
> >
> >
> >>
> >> Best Regards.
> >>
> >> Aijun Wang
> >> Network R&D and Operation Support Department China Telecom Corporation
> >> Limited Beijing Research Institute,Beijing, China.
> >>
> >> -----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6-----
> >> =E5=8F=91=E4=BB=B6=E4=BA=BA: Peter Psenak [mailto:ppsenak=3D40cisco.co=
m@dmarc.ietf.org]
> >> =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2018=E5=B9=B47=E6=9C=8823=E6=97=
=A5 16:15
> >> =E6=94=B6=E4=BB=B6=E4=BA=BA: Aijun Wang; chopps@chopps.org
> >> =E6=8A=84=E9=80=81: lsr@ietf.org; 'Ketan Talaulikar (ketant)'; 'Acee L=
indem (acee)';
> >> 'Dongjie (Jimmy)'
> >> =E4=B8=BB=E9=A2=98: Re: [Lsr] Regarding OSPF extension for inter-area =
topology
> >> retrieval
> >>
> >> Hi Aijun,
> >>
> >> you are trying to reconstruct the topology of the remote area based on
> >> the fact that two routers are connected to the same subnet. It does
> >> not work
> >> because:
> >>
> >> 1. connections between routers can be unnumbered 2. routers can be
> >> connected via LAN, in which case only DR announces the prefix.
> >>
> >> In summary, what you propose does not work.
> >>
> >> thanks,
> >> Peter
> >>
> >>
> >>
> >> On 23/07/18 09:49 , Aijun Wang wrote:
> >>> (Sorry for my previous mail sent wrongly to the IDR mail list, please
> >>> reply on this thread within the LSR wg)
> >>>
> >>> Hi, Peter:
> >>>
> >>> I am Aijun Wang from China Telecom, the author of draft about =E2=80=
=9COSPF
> >>> extension for inter-area topology retrieval=E2=80=9D
> >>> <https://datatracker.ietf.org/doc/draft-wang-lsr-ospf-inter-area-topo
> >>> l ogy-ext/>, which is presented by Mr.Jie Dong during the IETF102
> >>> meeting.
> >>>
> >>> Thanks for your comments on the presentation material
> >>>
> >> <https://datatracker.ietf.org/meeting/102/materials/slides-102-lsr-osp
> >> f-inte
> >> r-area-topology-retrieval-00>.
> >>>
> >>> Below are my explanation that regarding to the question about =E2=80=
=9Chow it
> >>> retrievals the inter-area topology based on the extension information=
=E2=80=9D:
> >>>
> >>> Let=E2=80=99s see the graph that illustrates in Fig.1 at section 3
> >>> <https://tools.ietf.org/html/draft-wang-lsr-ospf-inter-area-topology-
> >>> e xt-00#section-3> of the draft(I copy it also below for your
> >>> conveniences ):
> >>>
> >>> Assuming we want to rebuild the connection between router S1 and
> >>> router
> >>> S2 that locates in area 1:
> >>>
> >>> 1)Normally, router S1 will advertise prefix N1 within its router LSA
> >>>
> >>> 2)When this router LSA reaches the ABR router R1, it will convert it
> >>> into summary LSA, add the =E2=80=9CSource Router Information=E2=80=9D=
, which is
> >>> router id of S1 in this example, as proposed in this draft.
> >>>
> >>> 3)R1 then floods this extension summary LSA to R0, which is running
> >>> BGP-LS protocol with IP SDN Controller. The controller then knows the
> >>> prefixes of N1 is from S1.
> >>>
> >>> 4)Router S2 will do the similar process, and the controller will also
> >>> knows the prefixes N1 is also from S2
> >>>
> >>> 5)Then it can reconstruct the connection between S1 and S2, which
> >>> prefix is N1. The topology within Area 1 can then be recovered
> >> accordingly.
> >>>
> >>> Does the above explanation can answer your question. if so, I can add
> >>> it into the context of this draft in updated version.
> >>>
> >>> Best Regards.
> >>>
> >>> Aijun Wang
> >>>
> >>> Network R&D and Operation Support Department
> >>>
> >>> China Telecom Corporation Limited Beijing Research Institute,Beijing,
> >> China.
> >>>
> >>
> >> _______________________________________________
> >> 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
> >
> > .
> >
>
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr
>

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+1 to Peter. We should not define fragile solutions within the IETF.<br><br=
>There are also a multitude of other solutions here already:<br><br>1) IGP =
adjacency with one router in each area (at a minimum - probably two for a r=
obust system) over a tunnel. Deployed in many networks for years. <br>2) BG=
P-LS to one router (ditto robustness comment) in each area. <br>3) streamin=
g telemetry of the LSDB contents via gNMI.<br><br>All these solutions exist=
 in shipping implementations - please let=E2=80=99s not add to the system c=
omplexity of the IGP here.<br><br>r. <br><div class=3D"gmail_quote"><div di=
r=3D"ltr">On Mon, Jul 23, 2018 at 12:30 Peter Psenak &lt;ppsenak=3D<a href=
=3D"mailto:40cisco.com@dmarc.ietf.org">40cisco.com@dmarc.ietf.org</a>&gt; w=
rote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex=
;border-left:1px #ccc solid;padding-left:1ex">Hi Aijun,<br>
<br>
On 23/07/18 13:07 , Aijun Wang wrote:<br>
&gt; Hi, Peter:<br>
&gt; <br>
&gt; For routers that connected by LAN, the router will establish adjacent<=
br>
&gt; neighbor with DR, but not only DR advertises the connected prefixes. <=
br>
<br>
only the Network LSA includes the network mask, other routers would<br>
include the interface address only.<br>
<br>
<br>
&gt; DR and<br>
&gt; DRother will all advertise type 1 and type 2 LSA with each other, then=
 the<br>
&gt; process and proposal described in this draft will still work.<br>
&gt; We seldom use the ip unnumbered features in our network, can we ignore=
 it<br>
&gt; then? Or other persons has some idea on such situation?<br>
<br>
the fact that you do not use unnumbered is not really relevant. IETF<br>
defines solutions that MUST work for all possible scenarios, not only<br>
for a specific one.<br>
<br>
&gt; Anycast prefixes are often /32 long, this can be easily filtered by SD=
N<br>
&gt; controller because the link prefixes between two routers will be no la=
rger<br>
&gt; than /32 for IPv4 network.<br>
<br>
protocol allows to advertise the same prefix with an arbitrary mask from<br=
>
multiple routers without these routers being directly connected. Your<br>
proposal is based on the assumptions that are incorrect.<br>
<br>
thanks,<br>
Peter<br>
<br>
&gt; <br>
&gt; Best Regards.<br>
&gt; <br>
&gt; Aijun Wang<br>
&gt; Network R&amp;D and Operation Support Department<br>
&gt; China Telecom Corporation Limited Beijing Research Institute,Beijing, =
China.<br>
&gt; <br>
&gt; -----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6-----<br>
&gt; =E5=8F=91=E4=BB=B6=E4=BA=BA: Peter Psenak [mailto:<a href=3D"mailto:pp=
senak" target=3D"_blank">ppsenak</a>=3D<a href=3D"mailto:40cisco.com@dmarc.=
ietf.org" target=3D"_blank">40cisco.com@dmarc.ietf.org</a>]<br>
&gt; =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2018=E5=B9=B47=E6=9C=8823=E6=97=
=A5 18:20<br>
&gt; =E6=94=B6=E4=BB=B6=E4=BA=BA: Aijun Wang; &#39;Peter Psenak&#39;; <a hr=
ef=3D"mailto:chopps@chopps.org" target=3D"_blank">chopps@chopps.org</a><br>
&gt; =E6=8A=84=E9=80=81: <a href=3D"mailto:lsr@ietf.org" target=3D"_blank">=
lsr@ietf.org</a>; &#39;Ketan Talaulikar (ketant)&#39;; &#39;Acee Lindem (ac=
ee)&#39;;<br>
&gt; &#39;Dongjie (Jimmy)&#39;<br>
&gt; =E4=B8=BB=E9=A2=98: Re: [Lsr] =E7=AD=94=E5=A4=8D: Regarding OSPF exten=
sion for inter-area topology<br>
&gt; retrieval<br>
&gt; <br>
&gt; Hi Aijun,<br>
&gt; <br>
&gt; On 23/07/18 11:16 , Aijun Wang wrote:<br>
&gt;&gt; Hi, Peter:<br>
&gt;&gt;<br>
&gt;&gt; Actually, I consider mainly the point-to-point connection and the<=
br>
&gt;&gt; numbered interface, which are normal in our network.<br>
&gt;&gt; For the two situations that you mentioned, I will investigation th=
e<br>
&gt;&gt; possible solutions and feedback you later.<br>
&gt;&gt;<br>
&gt;&gt; For the point-to-point and numbered interface, do you have other<b=
r>
&gt;&gt; questions then?<br>
&gt; <br>
&gt; the fact that two routers announce the same subnet, does not mean they=
 are<br>
&gt; connected together by p2p link. Anycast prefix is an example.<br>
&gt; <br>
&gt; The idea you are proposing simply does not work.<br>
&gt; <br>
&gt; thanks,<br>
&gt; Peter<br>
&gt; <br>
&gt; <br>
&gt;&gt;<br>
&gt;&gt; Best Regards.<br>
&gt;&gt;<br>
&gt;&gt; Aijun Wang<br>
&gt;&gt; Network R&amp;D and Operation Support Department China Telecom Cor=
poration<br>
&gt;&gt; Limited Beijing Research Institute,Beijing, China.<br>
&gt;&gt;<br>
&gt;&gt; -----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6-----<br>
&gt;&gt; =E5=8F=91=E4=BB=B6=E4=BA=BA: Peter Psenak [mailto:<a href=3D"mailt=
o:ppsenak" target=3D"_blank">ppsenak</a>=3D<a href=3D"mailto:40cisco.com@dm=
arc.ietf.org" target=3D"_blank">40cisco.com@dmarc.ietf.org</a>]<br>
&gt;&gt; =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2018=E5=B9=B47=E6=9C=8823=E6=
=97=A5 16:15<br>
&gt;&gt; =E6=94=B6=E4=BB=B6=E4=BA=BA: Aijun Wang; <a href=3D"mailto:chopps@=
chopps.org" target=3D"_blank">chopps@chopps.org</a><br>
&gt;&gt; =E6=8A=84=E9=80=81: <a href=3D"mailto:lsr@ietf.org" target=3D"_bla=
nk">lsr@ietf.org</a>; &#39;Ketan Talaulikar (ketant)&#39;; &#39;Acee Lindem=
 (acee)&#39;;<br>
&gt;&gt; &#39;Dongjie (Jimmy)&#39;<br>
&gt;&gt; =E4=B8=BB=E9=A2=98: Re: [Lsr] Regarding OSPF extension for inter-a=
rea topology<br>
&gt;&gt; retrieval<br>
&gt;&gt;<br>
&gt;&gt; Hi Aijun,<br>
&gt;&gt;<br>
&gt;&gt; you are trying to reconstruct the topology of the remote area base=
d on<br>
&gt;&gt; the fact that two routers are connected to the same subnet. It doe=
s<br>
&gt;&gt; not work<br>
&gt;&gt; because:<br>
&gt;&gt;<br>
&gt;&gt; 1. connections between routers can be unnumbered 2. routers can be=
<br>
&gt;&gt; connected via LAN, in which case only DR announces the prefix.<br>
&gt;&gt;<br>
&gt;&gt; In summary, what you propose does not work.<br>
&gt;&gt;<br>
&gt;&gt; thanks,<br>
&gt;&gt; Peter<br>
&gt;&gt;<br>
&gt;&gt;<br>
&gt;&gt;<br>
&gt;&gt; On 23/07/18 09:49 , Aijun Wang wrote:<br>
&gt;&gt;&gt; (Sorry for my previous mail sent wrongly to the IDR mail list,=
 please<br>
&gt;&gt;&gt; reply on this thread within the LSR wg)<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; Hi, Peter:<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; I am Aijun Wang from China Telecom, the author of draft about =
=E2=80=9COSPF<br>
&gt;&gt;&gt; extension for inter-area topology retrieval=E2=80=9D<br>
&gt;&gt;&gt; &lt;<a href=3D"https://datatracker.ietf.org/doc/draft-wang-lsr=
-ospf-inter-area-topo" rel=3D"noreferrer" target=3D"_blank">https://datatra=
cker.ietf.org/doc/draft-wang-lsr-ospf-inter-area-topo</a><br>
&gt;&gt;&gt; l ogy-ext/&gt;, which is presented by Mr.Jie Dong during the I=
ETF102<br>
&gt;&gt;&gt; meeting.<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; Thanks for your comments on the presentation material<br>
&gt;&gt;&gt;<br>
&gt;&gt; &lt;<a href=3D"https://datatracker.ietf.org/meeting/102/materials/=
slides-102-lsr-osp" rel=3D"noreferrer" target=3D"_blank">https://datatracke=
r.ietf.org/meeting/102/materials/slides-102-lsr-osp</a><br>
&gt;&gt; f-inte<br>
&gt;&gt; r-area-topology-retrieval-00&gt;.<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; Below are my explanation that regarding to the question about =
=E2=80=9Chow it<br>
&gt;&gt;&gt; retrievals the inter-area topology based on the extension info=
rmation=E2=80=9D:<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; Let=E2=80=99s see the graph that illustrates in Fig.1 at secti=
on 3<br>
&gt;&gt;&gt; &lt;<a href=3D"https://tools.ietf.org/html/draft-wang-lsr-ospf=
-inter-area-topology-" rel=3D"noreferrer" target=3D"_blank">https://tools.i=
etf.org/html/draft-wang-lsr-ospf-inter-area-topology-</a><br>
&gt;&gt;&gt; e xt-00#section-3&gt; of the draft(I copy it also below for yo=
ur<br>
&gt;&gt;&gt; conveniences ):<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; Assuming we want to rebuild the connection between router S1 a=
nd<br>
&gt;&gt;&gt; router<br>
&gt;&gt;&gt; S2 that locates in area 1:<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; 1)Normally, router S1 will advertise prefix N1 within its rout=
er LSA<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; 2)When this router LSA reaches the ABR router R1, it will conv=
ert it<br>
&gt;&gt;&gt; into summary LSA, add the =E2=80=9CSource Router Information=
=E2=80=9D, which is<br>
&gt;&gt;&gt; router id of S1 in this example, as proposed in this draft.<br=
>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; 3)R1 then floods this extension summary LSA to R0, which is ru=
nning<br>
&gt;&gt;&gt; BGP-LS protocol with IP SDN Controller. The controller then kn=
ows the<br>
&gt;&gt;&gt; prefixes of N1 is from S1.<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; 4)Router S2 will do the similar process, and the controller wi=
ll also<br>
&gt;&gt;&gt; knows the prefixes N1 is also from S2<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; 5)Then it can reconstruct the connection between S1 and S2, wh=
ich<br>
&gt;&gt;&gt; prefix is N1. The topology within Area 1 can then be recovered=
<br>
&gt;&gt; accordingly.<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; Does the above explanation can answer your question. if so, I =
can add<br>
&gt;&gt;&gt; it into the context of this draft in updated version.<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; Best Regards.<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; Aijun Wang<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; Network R&amp;D and Operation Support Department<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; China Telecom Corporation Limited Beijing Research Institute,B=
eijing,<br>
&gt;&gt; China.<br>
&gt;&gt;&gt;<br>
&gt;&gt;<br>
&gt;&gt; _______________________________________________<br>
&gt;&gt; Lsr mailing list<br>
&gt;&gt; <a href=3D"mailto:Lsr@ietf.org" target=3D"_blank">Lsr@ietf.org</a>=
<br>
&gt;&gt; <a href=3D"https://www.ietf.org/mailman/listinfo/lsr" rel=3D"noref=
errer" target=3D"_blank">https://www.ietf.org/mailman/listinfo/lsr</a><br>
&gt;&gt;<br>
&gt;&gt; _______________________________________________<br>
&gt;&gt; Lsr mailing list<br>
&gt;&gt; <a href=3D"mailto:Lsr@ietf.org" target=3D"_blank">Lsr@ietf.org</a>=
<br>
&gt;&gt; <a href=3D"https://www.ietf.org/mailman/listinfo/lsr" rel=3D"noref=
errer" target=3D"_blank">https://www.ietf.org/mailman/listinfo/lsr</a><br>
&gt;&gt;<br>
&gt; <br>
&gt; _______________________________________________<br>
&gt; Lsr mailing list<br>
&gt; <a href=3D"mailto:Lsr@ietf.org" target=3D"_blank">Lsr@ietf.org</a><br>
&gt; <a href=3D"https://www.ietf.org/mailman/listinfo/lsr" rel=3D"noreferre=
r" target=3D"_blank">https://www.ietf.org/mailman/listinfo/lsr</a><br>
&gt; <br>
&gt; .<br>
&gt; <br>
<br>
_______________________________________________<br>
Lsr mailing list<br>
<a href=3D"mailto:Lsr@ietf.org" target=3D"_blank">Lsr@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/lsr" rel=3D"noreferrer" ta=
rget=3D"_blank">https://www.ietf.org/mailman/listinfo/lsr</a><br>
</blockquote></div>

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From: "Aijun Wang" <wangaijun@tsinghua.org.cn>
To: "'Rob Shakir'" <rjs@rob.sh>, "'Peter Psenak'" <ppsenak=40cisco.com@dmarc.ietf.org>
Cc: "'Dongjie \(Jimmy\)'" <jie.dong@huawei.com>, <chopps@chopps.org>, "'Ketan Talaulikar \(ketant\)'" <ketant@cisco.com>, <lsr@ietf.org>, "'Acee Lindem \(acee\)'" <acee@cisco.com>
References: <001601d42259$a860fff0$f922ffd0$@org.cn> <5B558E76.3010703@cisco.com> <003201d42265$cd011af0$670350d0$@org.cn> <5B55ABB5.60806@cisco.com> <003f01d42275$5ec00eb0$1c402c10$@org.cn> <5B55BC38.3050605@cisco.com> <CAHxMReYo_e+dDJ611X3eihV0WCToYqFDa2c+CLnfzhF8_L2YDA@mail.gmail.com>
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Hi, Peter:

=20

For point-to-point interface, as described in  OSPFv2(RFC2328 12.4.1.1.  =
Describing point-to-point interfaces) =
<https://tools.ietf.org/html/rfc2328#page-130> , the router LSA will =
include two links description for each interface, within which the =
=E2=80=9Ctype 3 link=E2=80=9D(stub network) will describe the subnet =
mask of the point-to-point interface.

For broadcast/NBMA interface, the DR will be elected and it will =
generate the network LSA which will include also the subnet mask of the =
connected interface.

For unnumbered and virtual link, if you consider we should include them =
also for all possible scenarios even if we seldom use them in large =
network, we can consider expand the summary LSA to cover it, as done by =
this draft.

For Anycast prefixes situation that you described(although we seldom =
plan our network in such way), the PCE controller will not deduce the =
wrong information from the reported information------Different router =
advertise the same prefix, why can=E2=80=99t they be connected in =
logically?=20

=20

On summary, the ABR can know and report the originator of the connected =
interface=E2=80=99s prefixes, and also the connected information for the =
unnumbered/virtual link from the traditional router LSA/network LSA =
message, thus can transfer them to the router that run BGP-LS, then to =
the PCE controller to retrieval the topology.

=20

To Rob:=20

=20

BGP-LS is one prominent method to get the underlay network topology and =
has more flexibility to control the topology export as described in RFC =
7752 <https://tools.ietf.org/html/rfc7752#section-1> .=20

=20

Solution 1) that you proposed is possible, but we will not run two =
different methods to get the topology.

Solution 2) is also one possible deployment, but it eliminates the =
advantage of the BGP-LS, in which it needs several interaction points =
with the underlay network. and such deployment is not belong to =
redundancy category as information got from different areaes are =
different.

Solution 3)--Streaming telemetry technology should be used mainly for =
the monitor of network devices, it requires the PCE controller to =
contact with every router in the network, is also not the optimal =
solution when compared with BGP-LS.

=20

We can update the current draft to include all possible scenarios that =
we are not aiming at beginning for integrity consideration. The proposed =
extension does not add to complexity of IGP. What we discussed here is =
the complexity of IGP protocol itself.

=20

Best Regards.

=20

Aijun Wang

Network R&D and Operation Support Department

China Telecom Corporation Limited Beijing Research Institute,Beijing, =
China.

=20

=E5=8F=91=E4=BB=B6=E4=BA=BA: Rob Shakir [mailto:rjs@rob.sh]=20
=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2018=E5=B9=B47=E6=9C=8824=E6=97=A5 =
7:04
=E6=94=B6=E4=BB=B6=E4=BA=BA: Peter Psenak
=E6=8A=84=E9=80=81: Dongjie (Jimmy); chopps@chopps.org; Ketan Talaulikar =
(ketant); Aijun Wang; lsr@ietf.org; Acee Lindem (acee)
=E4=B8=BB=E9=A2=98: Re: [Lsr] =E7=AD=94=E5=A4=8D: =E7=AD=94=E5=A4=8D: =
Regarding OSPF extension for inter-area topology retrieval

=20

+1 to Peter. We should not define fragile solutions within the IETF.

There are also a multitude of other solutions here already:

1) IGP adjacency with one router in each area (at a minimum - probably =
two for a robust system) over a tunnel. Deployed in many networks for =
years.=20
2) BGP-LS to one router (ditto robustness comment) in each area.=20
3) streaming telemetry of the LSDB contents via gNMI.

All these solutions exist in shipping implementations - please =
let=E2=80=99s not add to the system complexity of the IGP here.

r.=20

On Mon, Jul 23, 2018 at 12:30 Peter Psenak =
<ppsenak=3D40cisco.com@dmarc.ietf.org> wrote:

Hi Aijun,

On 23/07/18 13:07 , Aijun Wang wrote:
> Hi, Peter:
>=20
> For routers that connected by LAN, the router will establish adjacent
> neighbor with DR, but not only DR advertises the connected prefixes.=20

only the Network LSA includes the network mask, other routers would
include the interface address only.


> DR and
> DRother will all advertise type 1 and type 2 LSA with each other, then =
the
> process and proposal described in this draft will still work.
> We seldom use the ip unnumbered features in our network, can we ignore =
it
> then? Or other persons has some idea on such situation?

the fact that you do not use unnumbered is not really relevant. IETF
defines solutions that MUST work for all possible scenarios, not only
for a specific one.

> Anycast prefixes are often /32 long, this can be easily filtered by =
SDN
> controller because the link prefixes between two routers will be no =
larger
> than /32 for IPv4 network.

protocol allows to advertise the same prefix with an arbitrary mask from
multiple routers without these routers being directly connected. Your
proposal is based on the assumptions that are incorrect.

thanks,
Peter

>=20
> Best Regards.
>=20
> Aijun Wang
> Network R&D and Operation Support Department
> China Telecom Corporation Limited Beijing Research Institute,Beijing, =
China.
>=20
> -----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6-----
> =E5=8F=91=E4=BB=B6=E4=BA=BA: Peter Psenak =
[mailto:ppsenak=3D40cisco.com@dmarc.ietf.org]
> =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: =
2018=E5=B9=B47=E6=9C=8823=E6=97=A5 18:20
> =E6=94=B6=E4=BB=B6=E4=BA=BA: Aijun Wang; 'Peter Psenak'; =
chopps@chopps.org
> =E6=8A=84=E9=80=81: lsr@ietf.org; 'Ketan Talaulikar (ketant)'; 'Acee =
Lindem (acee)';
> 'Dongjie (Jimmy)'
> =E4=B8=BB=E9=A2=98: Re: [Lsr] =E7=AD=94=E5=A4=8D: Regarding OSPF =
extension for inter-area topology
> retrieval
>=20
> Hi Aijun,
>=20
> On 23/07/18 11:16 , Aijun Wang wrote:
>> Hi, Peter:
>>
>> Actually, I consider mainly the point-to-point connection and the
>> numbered interface, which are normal in our network.
>> For the two situations that you mentioned, I will investigation the
>> possible solutions and feedback you later.
>>
>> For the point-to-point and numbered interface, do you have other
>> questions then?
>=20
> the fact that two routers announce the same subnet, does not mean they =
are
> connected together by p2p link. Anycast prefix is an example.
>=20
> The idea you are proposing simply does not work.
>=20
> thanks,
> Peter
>=20
>=20
>>
>> Best Regards.
>>
>> Aijun Wang
>> Network R&D and Operation Support Department China Telecom =
Corporation
>> Limited Beijing Research Institute,Beijing, China.
>>
>> -----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6-----
>> =E5=8F=91=E4=BB=B6=E4=BA=BA: Peter Psenak =
[mailto:ppsenak=3D40cisco.com@dmarc.ietf.org]
>> =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: =
2018=E5=B9=B47=E6=9C=8823=E6=97=A5 16:15
>> =E6=94=B6=E4=BB=B6=E4=BA=BA: Aijun Wang; chopps@chopps.org
>> =E6=8A=84=E9=80=81: lsr@ietf.org; 'Ketan Talaulikar (ketant)'; 'Acee =
Lindem (acee)';
>> 'Dongjie (Jimmy)'
>> =E4=B8=BB=E9=A2=98: Re: [Lsr] Regarding OSPF extension for inter-area =
topology
>> retrieval
>>
>> Hi Aijun,
>>
>> you are trying to reconstruct the topology of the remote area based =
on
>> the fact that two routers are connected to the same subnet. It does
>> not work
>> because:
>>
>> 1. connections between routers can be unnumbered 2. routers can be
>> connected via LAN, in which case only DR announces the prefix.
>>
>> In summary, what you propose does not work.
>>
>> thanks,
>> Peter
>>
>>
>>
>> On 23/07/18 09:49 , Aijun Wang wrote:
>>> (Sorry for my previous mail sent wrongly to the IDR mail list, =
please
>>> reply on this thread within the LSR wg)
>>>
>>> Hi, Peter:
>>>
>>> I am Aijun Wang from China Telecom, the author of draft about =
=E2=80=9COSPF
>>> extension for inter-area topology retrieval=E2=80=9D
>>> =
<https://datatracker.ietf.org/doc/draft-wang-lsr-ospf-inter-area-topo
>>> l ogy-ext/>, which is presented by Mr.Jie Dong during the IETF102
>>> meeting.
>>>
>>> Thanks for your comments on the presentation material
>>>
>> =
<https://datatracker.ietf.org/meeting/102/materials/slides-102-lsr-osp
>> f-inte
>> r-area-topology-retrieval-00>.
>>>
>>> Below are my explanation that regarding to the question about =
=E2=80=9Chow it
>>> retrievals the inter-area topology based on the extension =
information=E2=80=9D:
>>>
>>> Let=E2=80=99s see the graph that illustrates in Fig.1 at section 3
>>> =
<https://tools.ietf.org/html/draft-wang-lsr-ospf-inter-area-topology-
>>> e xt-00#section-3> of the draft(I copy it also below for your
>>> conveniences ):
>>>
>>> Assuming we want to rebuild the connection between router S1 and
>>> router
>>> S2 that locates in area 1:
>>>
>>> 1)Normally, router S1 will advertise prefix N1 within its router LSA
>>>
>>> 2)When this router LSA reaches the ABR router R1, it will convert it
>>> into summary LSA, add the =E2=80=9CSource Router =
Information=E2=80=9D, which is
>>> router id of S1 in this example, as proposed in this draft.
>>>
>>> 3)R1 then floods this extension summary LSA to R0, which is running
>>> BGP-LS protocol with IP SDN Controller. The controller then knows =
the
>>> prefixes of N1 is from S1.
>>>
>>> 4)Router S2 will do the similar process, and the controller will =
also
>>> knows the prefixes N1 is also from S2
>>>
>>> 5)Then it can reconstruct the connection between S1 and S2, which
>>> prefix is N1. The topology within Area 1 can then be recovered
>> accordingly.
>>>
>>> Does the above explanation can answer your question. if so, I can =
add
>>> it into the context of this draft in updated version.
>>>
>>> Best Regards.
>>>
>>> Aijun Wang
>>>
>>> Network R&D and Operation Support Department
>>>
>>> China Telecom Corporation Limited Beijing Research =
Institute,Beijing,
>> China.
>>>
>>
>> _______________________________________________
>> 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
> _______________________________________________
> 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


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vlink=3Dpurple><div class=3DWordSection1><p class=3DMsoNormal><u><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>Hi, Peter:<o:p></o:p></span></u></p><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'><o:p>&nbsp;</o:p></span></p><pre><span lang=3DEN-US =
style=3D'font-size:10.0pt;color:black'>For point-to-point interface, as =
described in </span><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>=C2=A0</span><span lang=3DEN-US =
style=3D'font-size:10.0pt;color:black'><a =
href=3D"https://tools.ietf.org/html/rfc2328#page-130">OSPFv2(RFC2328 =
12.4.1.1.=C2=A0 Describing point-to-point interfaces)</a>, the router =
LSA will include two links description for each interface, within which =
the =E2=80=9Ctype 3 link=E2=80=9D(stub network) will describe the subnet =
mask of the point-to-point interface.<o:p></o:p></span></pre><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.0pt;color:black'>For broadcast/NBMA interface, the =
DR will be elected and it will generate the network LSA which will =
include also the subnet mask of the connected =
interface.<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.0pt;color:black'>For unnumbered and virtual link, =
if you consider we should include them also for all possible scenarios =
even if we seldom use them in large network, we can consider expand the =
summary LSA to cover it, as done by this draft.<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.0pt;color:black'>For Anycast prefixes situation =
that you described(although we seldom plan our network in such way), the =
PCE controller will not deduce the wrong information from the reported =
information------Different router advertise the same prefix, why =
can=E2=80=99t they be connected in logically? <o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.0pt;color:black'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.0pt;color:black'>On summary, the ABR can know and =
report the originator of the connected interface=E2=80=99s prefixes, and =
also the connected information for the unnumbered/virtual link from the =
traditional router LSA/network LSA message, thus can transfer them to =
the router that run BGP-LS, then to the PCE controller to retrieval the =
topology.<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.0pt;color:black'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><u><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>To Rob: <o:p></o:p></span></u></p><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:10.0pt;color:black'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.0pt;color:black'>BGP-LS is one prominent method to =
get the underlay network topology and has more flexibility to control =
the topology export as described in <a =
href=3D"https://tools.ietf.org/html/rfc7752#section-1">RFC 7752</a>. =
<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.0pt;color:black'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.0pt;color:black'>Solution 1) that you proposed is =
possible, but we will not run two different methods to get the =
topology.<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.0pt;color:black'>Solution 2) is also one possible =
deployment, but it eliminates the advantage of the BGP-LS, in which it =
needs several interaction points with the underlay network. and such =
deployment is not belong to redundancy category as information got from =
different areaes are different.<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.0pt;color:black'>Solution 3)--Streaming telemetry =
technology should be used mainly for the monitor of network devices, it =
requires the PCE controller to contact with every router in the network, =
is also not the optimal solution when compared with =
BGP-LS.<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.0pt;color:black'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.0pt;color:black'>We can update the current draft =
to include all possible scenarios that we are not aiming at beginning =
for integrity consideration. The proposed extension does not add to =
complexity of IGP. What we discussed here is the complexity of IGP =
protocol itself.<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal =
style=3D'text-align:justify;text-justify:inter-ideograph'><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>Best Regards.<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'text-align:justify;text-justify:inter-ideograph'><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal =
style=3D'text-align:justify;text-justify:inter-ideograph'><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>Aijun Wang<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'text-align:justify;text-justify:inter-ideograph'><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>Network R&amp;D and Operation Support =
Department<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'text-align:justify;text-justify:inter-ideograph'><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>China Telecom Corporation Limited Beijing Research Institute,Beijing, =
China.</span><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'><o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'><o:p>&nbsp;</o:p></span></p><div =
style=3D'border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm'><p class=3DMsoNormal><b><span =
style=3D'font-size:10.0pt'>=E5=8F=91=E4=BB=B6=E4=BA=BA<span =
lang=3DEN-US>:</span></span></b><span lang=3DEN-US =
style=3D'font-size:10.0pt'> Rob Shakir [mailto:rjs@rob.sh] =
<br></span><b><span =
style=3D'font-size:10.0pt'>=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4<span =
lang=3DEN-US>:</span></span></b><span lang=3DEN-US =
style=3D'font-size:10.0pt'> 2018</span><span =
style=3D'font-size:10.0pt'>=E5=B9=B4<span =
lang=3DEN-US>7</span>=E6=9C=88<span lang=3DEN-US>24</span>=E6=97=A5<span =
lang=3DEN-US> 7:04<br></span><b>=E6=94=B6=E4=BB=B6=E4=BA=BA<span =
lang=3DEN-US>:</span></b><span lang=3DEN-US> Peter =
Psenak<br></span><b>=E6=8A=84=E9=80=81<span =
lang=3DEN-US>:</span></b><span lang=3DEN-US> Dongjie (Jimmy); =
chopps@chopps.org; Ketan Talaulikar (ketant); Aijun Wang; lsr@ietf.org; =
Acee Lindem (acee)<br></span><b>=E4=B8=BB=E9=A2=98<span =
lang=3DEN-US>:</span></b><span lang=3DEN-US> Re: [Lsr] =
</span>=E7=AD=94=E5=A4=8D<span lang=3DEN-US>: =
</span>=E7=AD=94=E5=A4=8D<span lang=3DEN-US>: Regarding OSPF extension =
for inter-area topology retrieval<o:p></o:p></span></span></p></div><p =
class=3DMsoNormal><span lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US>+1 to Peter. We should not define =
fragile solutions within the IETF.<br><br>There are also a multitude of =
other solutions here already:<br><br>1) IGP adjacency with one router in =
each area (at a minimum - probably two for a robust system) over a =
tunnel. Deployed in many networks for years. <br>2) BGP-LS to one router =
(ditto robustness comment) in each area. <br>3) streaming telemetry of =
the LSDB contents via gNMI.<br><br>All these solutions exist in shipping =
implementations - please let=E2=80=99s not add to the system complexity =
of the IGP here.<br><br>r. <o:p></o:p></span></p><div><div><p =
class=3DMsoNormal><span lang=3DEN-US>On Mon, Jul 23, 2018 at 12:30 Peter =
Psenak &lt;ppsenak=3D<a =
href=3D"mailto:40cisco.com@dmarc.ietf.org">40cisco.com@dmarc.ietf.org</a>=
&gt; wrote:<o:p></o:p></span></p></div><blockquote =
style=3D'border:none;border-left:solid #CCCCCC 1.0pt;padding:0cm 0cm 0cm =
6.0pt;margin-left:4.8pt;margin-right:0cm'><p class=3DMsoNormal><span =
lang=3DEN-US>Hi Aijun,<br><br>On 23/07/18 13:07 , Aijun Wang =
wrote:<br>&gt; Hi, Peter:<br>&gt; <br>&gt; For routers that connected by =
LAN, the router will establish adjacent<br>&gt; neighbor with DR, but =
not only DR advertises the connected prefixes. <br><br>only the Network =
LSA includes the network mask, other routers would<br>include the =
interface address only.<br><br><br>&gt; DR and<br>&gt; DRother will all =
advertise type 1 and type 2 LSA with each other, then the<br>&gt; =
process and proposal described in this draft will still work.<br>&gt; We =
seldom use the ip unnumbered features in our network, can we ignore =
it<br>&gt; then? Or other persons has some idea on such =
situation?<br><br>the fact that you do not use unnumbered is not really =
relevant. IETF<br>defines solutions that MUST work for all possible =
scenarios, not only<br>for a specific one.<br><br>&gt; Anycast prefixes =
are often /32 long, this can be easily filtered by SDN<br>&gt; =
controller because the link prefixes between two routers will be no =
larger<br>&gt; than /32 for IPv4 network.<br><br>protocol allows to =
advertise the same prefix with an arbitrary mask from<br>multiple =
routers without these routers being directly connected. Your<br>proposal =
is based on the assumptions that are =
incorrect.<br><br>thanks,<br>Peter<br><br>&gt; <br>&gt; Best =
Regards.<br>&gt; <br>&gt; Aijun Wang<br>&gt; Network R&amp;D and =
Operation Support Department<br>&gt; China Telecom Corporation Limited =
Beijing Research Institute,Beijing, China.<br>&gt; <br>&gt; =
-----</span>=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6<span =
lang=3DEN-US>-----<br>&gt; </span>=E5=8F=91=E4=BB=B6=E4=BA=BA<span =
lang=3DEN-US>: Peter Psenak [mailto:<a href=3D"mailto:ppsenak" =
target=3D"_blank">ppsenak</a>=3D<a =
href=3D"mailto:40cisco.com@dmarc.ietf.org" =
target=3D"_blank">40cisco.com@dmarc.ietf.org</a>]<br>&gt; =
</span>=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4<span lang=3DEN-US>: =
2018</span>=E5=B9=B4<span lang=3DEN-US>7</span>=E6=9C=88<span =
lang=3DEN-US>23</span>=E6=97=A5<span lang=3DEN-US> 18:20<br>&gt; =
</span>=E6=94=B6=E4=BB=B6=E4=BA=BA<span lang=3DEN-US>: Aijun Wang; =
'Peter Psenak'; <a href=3D"mailto:chopps@chopps.org" =
target=3D"_blank">chopps@chopps.org</a><br>&gt; =
</span>=E6=8A=84=E9=80=81<span lang=3DEN-US>: <a =
href=3D"mailto:lsr@ietf.org" target=3D"_blank">lsr@ietf.org</a>; 'Ketan =
Talaulikar (ketant)'; 'Acee Lindem (acee)';<br>&gt; 'Dongjie =
(Jimmy)'<br>&gt; </span>=E4=B8=BB=E9=A2=98<span lang=3DEN-US>: Re: [Lsr] =
</span>=E7=AD=94=E5=A4=8D<span lang=3DEN-US>: Regarding OSPF extension =
for inter-area topology<br>&gt; retrieval<br>&gt; <br>&gt; Hi =
Aijun,<br>&gt; <br>&gt; On 23/07/18 11:16 , Aijun Wang =
wrote:<br>&gt;&gt; Hi, Peter:<br>&gt;&gt;<br>&gt;&gt; Actually, I =
consider mainly the point-to-point connection and the<br>&gt;&gt; =
numbered interface, which are normal in our network.<br>&gt;&gt; For the =
two situations that you mentioned, I will investigation the<br>&gt;&gt; =
possible solutions and feedback you later.<br>&gt;&gt;<br>&gt;&gt; For =
the point-to-point and numbered interface, do you have other<br>&gt;&gt; =
questions then?<br>&gt; <br>&gt; the fact that two routers announce the =
same subnet, does not mean they are<br>&gt; connected together by p2p =
link. Anycast prefix is an example.<br>&gt; <br>&gt; The idea you are =
proposing simply does not work.<br>&gt; <br>&gt; thanks,<br>&gt; =
Peter<br>&gt; <br>&gt; <br>&gt;&gt;<br>&gt;&gt; Best =
Regards.<br>&gt;&gt;<br>&gt;&gt; Aijun Wang<br>&gt;&gt; Network R&amp;D =
and Operation Support Department China Telecom Corporation<br>&gt;&gt; =
Limited Beijing Research Institute,Beijing, =
China.<br>&gt;&gt;<br>&gt;&gt; =
-----</span>=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6<span =
lang=3DEN-US>-----<br>&gt;&gt; </span>=E5=8F=91=E4=BB=B6=E4=BA=BA<span =
lang=3DEN-US>: Peter Psenak [mailto:<a href=3D"mailto:ppsenak" =
target=3D"_blank">ppsenak</a>=3D<a =
href=3D"mailto:40cisco.com@dmarc.ietf.org" =
target=3D"_blank">40cisco.com@dmarc.ietf.org</a>]<br>&gt;&gt; =
</span>=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4<span lang=3DEN-US>: =
2018</span>=E5=B9=B4<span lang=3DEN-US>7</span>=E6=9C=88<span =
lang=3DEN-US>23</span>=E6=97=A5<span lang=3DEN-US> 16:15<br>&gt;&gt; =
</span>=E6=94=B6=E4=BB=B6=E4=BA=BA<span lang=3DEN-US>: Aijun Wang; <a =
href=3D"mailto:chopps@chopps.org" =
target=3D"_blank">chopps@chopps.org</a><br>&gt;&gt; =
</span>=E6=8A=84=E9=80=81<span lang=3DEN-US>: <a =
href=3D"mailto:lsr@ietf.org" target=3D"_blank">lsr@ietf.org</a>; 'Ketan =
Talaulikar (ketant)'; 'Acee Lindem (acee)';<br>&gt;&gt; 'Dongjie =
(Jimmy)'<br>&gt;&gt; </span>=E4=B8=BB=E9=A2=98<span lang=3DEN-US>: Re: =
[Lsr] Regarding OSPF extension for inter-area topology<br>&gt;&gt; =
retrieval<br>&gt;&gt;<br>&gt;&gt; Hi Aijun,<br>&gt;&gt;<br>&gt;&gt; you =
are trying to reconstruct the topology of the remote area based =
on<br>&gt;&gt; the fact that two routers are connected to the same =
subnet. It does<br>&gt;&gt; not work<br>&gt;&gt; =
because:<br>&gt;&gt;<br>&gt;&gt; 1. connections between routers can be =
unnumbered 2. routers can be<br>&gt;&gt; connected via LAN, in which =
case only DR announces the prefix.<br>&gt;&gt;<br>&gt;&gt; In summary, =
what you propose does not work.<br>&gt;&gt;<br>&gt;&gt; =
thanks,<br>&gt;&gt; =
Peter<br>&gt;&gt;<br>&gt;&gt;<br>&gt;&gt;<br>&gt;&gt; On 23/07/18 09:49 =
, Aijun Wang wrote:<br>&gt;&gt;&gt; (Sorry for my previous mail sent =
wrongly to the IDR mail list, please<br>&gt;&gt;&gt; reply on this =
thread within the LSR wg)<br>&gt;&gt;&gt;<br>&gt;&gt;&gt; Hi, =
Peter:<br>&gt;&gt;&gt;<br>&gt;&gt;&gt; I am Aijun Wang from China =
Telecom, the author of draft about =E2=80=9COSPF<br>&gt;&gt;&gt; =
extension for inter-area topology retrieval=E2=80=9D<br>&gt;&gt;&gt; =
&lt;<a =
href=3D"https://datatracker.ietf.org/doc/draft-wang-lsr-ospf-inter-area-t=
opo" =
target=3D"_blank">https://datatracker.ietf.org/doc/draft-wang-lsr-ospf-in=
ter-area-topo</a><br>&gt;&gt;&gt; l ogy-ext/&gt;, which is presented by =
Mr.Jie Dong during the IETF102<br>&gt;&gt;&gt; =
meeting.<br>&gt;&gt;&gt;<br>&gt;&gt;&gt; Thanks for your comments on the =
presentation material<br>&gt;&gt;&gt;<br>&gt;&gt; &lt;<a =
href=3D"https://datatracker.ietf.org/meeting/102/materials/slides-102-lsr=
-osp" =
target=3D"_blank">https://datatracker.ietf.org/meeting/102/materials/slid=
es-102-lsr-osp</a><br>&gt;&gt; f-inte<br>&gt;&gt; =
r-area-topology-retrieval-00&gt;.<br>&gt;&gt;&gt;<br>&gt;&gt;&gt; Below =
are my explanation that regarding to the question about =E2=80=9Chow =
it<br>&gt;&gt;&gt; retrievals the inter-area topology based on the =
extension information=E2=80=9D:<br>&gt;&gt;&gt;<br>&gt;&gt;&gt; =
Let=E2=80=99s see the graph that illustrates in Fig.1 at section =
3<br>&gt;&gt;&gt; &lt;<a =
href=3D"https://tools.ietf.org/html/draft-wang-lsr-ospf-inter-area-topolo=
gy-" =
target=3D"_blank">https://tools.ietf.org/html/draft-wang-lsr-ospf-inter-a=
rea-topology-</a><br>&gt;&gt;&gt; e xt-00#section-3&gt; of the draft(I =
copy it also below for your<br>&gt;&gt;&gt; conveniences =
):<br>&gt;&gt;&gt;<br>&gt;&gt;&gt; Assuming we want to rebuild the =
connection between router S1 and<br>&gt;&gt;&gt; router<br>&gt;&gt;&gt; =
S2 that locates in area 1:<br>&gt;&gt;&gt;<br>&gt;&gt;&gt; 1)Normally, =
router S1 will advertise prefix N1 within its router =
LSA<br>&gt;&gt;&gt;<br>&gt;&gt;&gt; 2)When this router LSA reaches the =
ABR router R1, it will convert it<br>&gt;&gt;&gt; into summary LSA, add =
the =E2=80=9CSource Router Information=E2=80=9D, which =
is<br>&gt;&gt;&gt; router id of S1 in this example, as proposed in this =
draft.<br>&gt;&gt;&gt;<br>&gt;&gt;&gt; 3)R1 then floods this extension =
summary LSA to R0, which is running<br>&gt;&gt;&gt; BGP-LS protocol with =
IP SDN Controller. The controller then knows the<br>&gt;&gt;&gt; =
prefixes of N1 is from S1.<br>&gt;&gt;&gt;<br>&gt;&gt;&gt; 4)Router S2 =
will do the similar process, and the controller will =
also<br>&gt;&gt;&gt; knows the prefixes N1 is also from =
S2<br>&gt;&gt;&gt;<br>&gt;&gt;&gt; 5)Then it can reconstruct the =
connection between S1 and S2, which<br>&gt;&gt;&gt; prefix is N1. The =
topology within Area 1 can then be recovered<br>&gt;&gt; =
accordingly.<br>&gt;&gt;&gt;<br>&gt;&gt;&gt; Does the above explanation =
can answer your question. if so, I can add<br>&gt;&gt;&gt; it into the =
context of this draft in updated =
version.<br>&gt;&gt;&gt;<br>&gt;&gt;&gt; Best =
Regards.<br>&gt;&gt;&gt;<br>&gt;&gt;&gt; Aijun =
Wang<br>&gt;&gt;&gt;<br>&gt;&gt;&gt; Network R&amp;D and Operation =
Support Department<br>&gt;&gt;&gt;<br>&gt;&gt;&gt; China Telecom =
Corporation Limited Beijing Research Institute,Beijing,<br>&gt;&gt; =
China.<br>&gt;&gt;&gt;<br>&gt;&gt;<br>&gt;&gt; =
_______________________________________________<br>&gt;&gt; Lsr mailing =
list<br>&gt;&gt; <a href=3D"mailto:Lsr@ietf.org" =
target=3D"_blank">Lsr@ietf.org</a><br>&gt;&gt; <a =
href=3D"https://www.ietf.org/mailman/listinfo/lsr" =
target=3D"_blank">https://www.ietf.org/mailman/listinfo/lsr</a><br>&gt;&g=
t;<br>&gt;&gt; =
_______________________________________________<br>&gt;&gt; Lsr mailing =
list<br>&gt;&gt; <a href=3D"mailto:Lsr@ietf.org" =
target=3D"_blank">Lsr@ietf.org</a><br>&gt;&gt; <a =
href=3D"https://www.ietf.org/mailman/listinfo/lsr" =
target=3D"_blank">https://www.ietf.org/mailman/listinfo/lsr</a><br>&gt;&g=
t;<br>&gt; <br>&gt; =
_______________________________________________<br>&gt; Lsr mailing =
list<br>&gt; <a href=3D"mailto:Lsr@ietf.org" =
target=3D"_blank">Lsr@ietf.org</a><br>&gt; <a =
href=3D"https://www.ietf.org/mailman/listinfo/lsr" =
target=3D"_blank">https://www.ietf.org/mailman/listinfo/lsr</a><br>&gt; =
<br>&gt; .<br>&gt; =
<br><br>_______________________________________________<br>Lsr mailing =
list<br><a href=3D"mailto:Lsr@ietf.org" =
target=3D"_blank">Lsr@ietf.org</a><br><a =
href=3D"https://www.ietf.org/mailman/listinfo/lsr" =
target=3D"_blank">https://www.ietf.org/mailman/listinfo/lsr</a><o:p></o:p=
></span></p></blockquote></div></div></body></html>
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Hi Aijun,

On 24/07/18 05:37 , Aijun Wang wrote:
> _Hi, Peter:_
>
> For point-to-point interface, as described in  OSPFv2(RFC2328 12.4.1.1.  Describing point-to-point interfaces)  <https://tools.ietf.org/html/rfc2328#page-130>, the router LSA will include two links description for each interface, within which the â€œtype 3 linkâ€�(stub network) will describe the subnet mask of the point-to-point interface.
>
> For broadcast/NBMA interface, the DR will be elected and it will
> generate the network LSA which will include also the subnet mask of the
> connected interface.
>
> For unnumbered and virtual link, if you consider we should include them
> also for all possible scenarios even if we seldom use them in large
> network, we can consider expand the summary LSA to cover it, as done by
> this draft.

there is no way to address unnumbered p2p case your way, because there 
is no Summary LSA generated to other area in such case.

Anyway, reconstructing a topology of a remote area based on the prefix 
announcements that come from it is a broken concept. I have given you 
several examples where your proposal does not work.

thanks,
Peter

>
> For Anycast prefixes situation that you described(although we seldom
> plan our network in such way), the PCE controller will not deduce the
> wrong information from the reported information------Different router
> advertise the same prefix, why canâ€™t they be connected in logically?
>
> On summary, the ABR can know and report the originator of the connected
> interfaceâ€™s prefixes, and also the connected information for the
> unnumbered/virtual link from the traditional router LSA/network LSA
> message, thus can transfer them to the router that run BGP-LS, then to
> the PCE controller to retrieval the topology.
>
> _To Rob: _
>
> BGP-LS is one prominent method to get the underlay network topology and
> has more flexibility to control the topology export as described in RFC
> 7752 <https://tools.ietf.org/html/rfc7752#section-1>.
>
> Solution 1) that you proposed is possible, but we will not run two
> different methods to get the topology.
>
> Solution 2) is also one possible deployment, but it eliminates the
> advantage of the BGP-LS, in which it needs several interaction points
> with the underlay network. and such deployment is not belong to
> redundancy category as information got from different areaes are different.
>
> Solution 3)--Streaming telemetry technology should be used mainly for
> the monitor of network devices, it requires the PCE controller to
> contact with every router in the network, is also not the optimal
> solution when compared with BGP-LS.
>
> We can update the current draft to include all possible scenarios that
> we are not aiming at beginning for integrity consideration. The proposed
> extension does not add to complexity of IGP. What we discussed here is
> the complexity of IGP protocol itself.
>
> Best Regards.
>
> Aijun Wang
>
> Network R&D and Operation Support Department
>
> China Telecom Corporation Limited Beijing Research Institute,Beijing, China.
>
> *å�‘ä»¶äºº:*Rob Shakir [mailto:rjs@rob.sh]
> *å�‘é€�æ—¶é—´:*2018å¹´7æœˆ24æ—¥7:04
> *æ”¶ä»¶äºº:*Peter Psenak
> *æŠ„é€�:*Dongjie (Jimmy); chopps@chopps.org; Ketan Talaulikar (ketant);
> Aijun Wang; lsr@ietf.org; Acee Lindem (acee)
> *ä¸»é¢˜:*Re: [Lsr] ç­”å¤�: ç­”å¤�: Regarding OSPF extension for inter-area
> topology retrieval
>
> +1 to Peter. We should not define fragile solutions within the IETF.
>
> There are also a multitude of other solutions here already:
>
> 1) IGP adjacency with one router in each area (at a minimum - probably
> two for a robust system) over a tunnel. Deployed in many networks for
> years.
> 2) BGP-LS to one router (ditto robustness comment) in each area.
> 3) streaming telemetry of the LSDB contents via gNMI.
>
> All these solutions exist in shipping implementations - please letâ€™s not
> add to the system complexity of the IGP here.
>
> r.
>
> On Mon, Jul 23, 2018 at 12:30 Peter Psenak
> <ppsenak=40cisco.com@dmarc.ietf.org <mailto:40cisco.com@dmarc.ietf.org>>
> wrote:
>
>     Hi Aijun,
>
>     On 23/07/18 13:07 , Aijun Wang wrote:
>     > Hi, Peter:
>     >
>     > For routers that connected by LAN, the router will establish adjacent
>     > neighbor with DR, but not only DR advertises the connected prefixes.
>
>     only the Network LSA includes the network mask, other routers would
>     include the interface address only.
>
>
>     > DR and
>     > DRother will all advertise type 1 and type 2 LSA with each other, then the
>     > process and proposal described in this draft will still work.
>     > We seldom use the ip unnumbered features in our network, can we ignore it
>     > then? Or other persons has some idea on such situation?
>
>     the fact that you do not use unnumbered is not really relevant. IETF
>     defines solutions that MUST work for all possible scenarios, not only
>     for a specific one.
>
>     > Anycast prefixes are often /32 long, this can be easily filtered by SDN
>     > controller because the link prefixes between two routers will be no larger
>     > than /32 for IPv4 network.
>
>     protocol allows to advertise the same prefix with an arbitrary mask from
>     multiple routers without these routers being directly connected. Your
>     proposal is based on the assumptions that are incorrect.
>
>     thanks,
>     Peter
>
>     >
>     > Best Regards.
>     >
>     > Aijun Wang
>     > Network R&D and Operation Support Department
>     > China Telecom Corporation Limited Beijing Research Institute,Beijing, China.
>     >
>     > -----é‚®ä»¶åŽŸä»¶-----
>     >å�‘ä»¶äºº: Peter Psenak [mailto:ppsenak
>     <mailto:ppsenak>=40cisco.com@dmarc.ietf.org
>     <mailto:40cisco.com@dmarc.ietf.org>]
>     >å�‘é€�æ—¶é—´: 2018å¹´7æœˆ23æ—¥18:20
>     >æ”¶ä»¶äºº: Aijun Wang; 'Peter Psenak'; chopps@chopps.org
>     <mailto:chopps@chopps.org>
>     >æŠ„é€�: lsr@ietf.org <mailto:lsr@ietf.org>; 'Ketan Talaulikar
>     (ketant)'; 'Acee Lindem (acee)';
>     > 'Dongjie (Jimmy)'
>     >ä¸»é¢˜: Re: [Lsr] ç­”å¤�: Regarding OSPF extension for inter-area topology
>     > retrieval
>     >
>     > Hi Aijun,
>     >
>     > On 23/07/18 11:16 , Aijun Wang wrote:
>     >> Hi, Peter:
>     >>
>     >> Actually, I consider mainly the point-to-point connection and the
>     >> numbered interface, which are normal in our network.
>     >> For the two situations that you mentioned, I will investigation the
>     >> possible solutions and feedback you later.
>     >>
>     >> For the point-to-point and numbered interface, do you have other
>     >> questions then?
>     >
>     > the fact that two routers announce the same subnet, does not mean they are
>     > connected together by p2p link. Anycast prefix is an example.
>     >
>     > The idea you are proposing simply does not work.
>     >
>     > thanks,
>     > Peter
>     >
>     >
>     >>
>     >> Best Regards.
>     >>
>     >> Aijun Wang
>     >> Network R&D and Operation Support Department China Telecom Corporation
>     >> Limited Beijing Research Institute,Beijing, China.
>     >>
>     >> -----é‚®ä»¶åŽŸä»¶-----
>     >>å�‘ä»¶äºº: Peter Psenak [mailto:ppsenak
>     <mailto:ppsenak>=40cisco.com@dmarc.ietf.org
>     <mailto:40cisco.com@dmarc.ietf.org>]
>     >>å�‘é€�æ—¶é—´: 2018å¹´7æœˆ23æ—¥16:15
>     >>æ”¶ä»¶äºº: Aijun Wang; chopps@chopps.org <mailto:chopps@chopps.org>
>     >>æŠ„é€�: lsr@ietf.org <mailto:lsr@ietf.org>; 'Ketan Talaulikar
>     (ketant)'; 'Acee Lindem (acee)';
>     >> 'Dongjie (Jimmy)'
>     >>ä¸»é¢˜: Re: [Lsr] Regarding OSPF extension for inter-area topology
>     >> retrieval
>     >>
>     >> Hi Aijun,
>     >>
>     >> you are trying to reconstruct the topology of the remote area based on
>     >> the fact that two routers are connected to the same subnet. It does
>     >> not work
>     >> because:
>     >>
>     >> 1. connections between routers can be unnumbered 2. routers can be
>     >> connected via LAN, in which case only DR announces the prefix.
>     >>
>     >> In summary, what you propose does not work.
>     >>
>     >> thanks,
>     >> Peter
>     >>
>     >>
>     >>
>     >> On 23/07/18 09:49 , Aijun Wang wrote:
>     >>> (Sorry for my previous mail sent wrongly to the IDR mail list, please
>     >>> reply on this thread within the LSR wg)
>     >>>
>     >>> Hi, Peter:
>     >>>
>     >>> I am Aijun Wang from China Telecom, the author of draft about â€œOSPF
>     >>> extension for inter-area topology retrievalâ€�
>     >>> <https://datatracker.ietf.org/doc/draft-wang-lsr-ospf-inter-area-topo
>     >>> l ogy-ext/>, which is presented by Mr.Jie Dong during the IETF102
>     >>> meeting.
>     >>>
>     >>> Thanks for your comments on the presentation material
>     >>>
>     >> <https://datatracker.ietf.org/meeting/102/materials/slides-102-lsr-osp
>     >> f-inte
>     >> r-area-topology-retrieval-00>.
>     >>>
>     >>> Below are my explanation that regarding to the question about â€œhow it
>     >>> retrievals the inter-area topology based on the extension informationâ€�:
>     >>>
>     >>> Letâ€™s see the graph that illustrates in Fig.1 at section 3
>     >>> <https://tools.ietf.org/html/draft-wang-lsr-ospf-inter-area-topology-
>     >>> e xt-00#section-3> of the draft(I copy it also below for your
>     >>> conveniences ):
>     >>>
>     >>> Assuming we want to rebuild the connection between router S1 and
>     >>> router
>     >>> S2 that locates in area 1:
>     >>>
>     >>> 1)Normally, router S1 will advertise prefix N1 within its router LSA
>     >>>
>     >>> 2)When this router LSA reaches the ABR router R1, it will convert it
>     >>> into summary LSA, add the â€œSource Router Informationâ€�, which is
>     >>> router id of S1 in this example, as proposed in this draft.
>     >>>
>     >>> 3)R1 then floods this extension summary LSA to R0, which is running
>     >>> BGP-LS protocol with IP SDN Controller. The controller then knows the
>     >>> prefixes of N1 is from S1.
>     >>>
>     >>> 4)Router S2 will do the similar process, and the controller will also
>     >>> knows the prefixes N1 is also from S2
>     >>>
>     >>> 5)Then it can reconstruct the connection between S1 and S2, which
>     >>> prefix is N1. The topology within Area 1 can then be recovered
>     >> accordingly.
>     >>>
>     >>> Does the above explanation can answer your question. if so, I can add
>     >>> it into the context of this draft in updated version.
>     >>>
>     >>> Best Regards.
>     >>>
>     >>> Aijun Wang
>     >>>
>     >>> Network R&D and Operation Support Department
>     >>>
>     >>> China Telecom Corporation Limited Beijing Research Institute,Beijing,
>     >> China.
>     >>>
>     >>
>     >> _______________________________________________
>     >> Lsr mailing list
>     >>Lsr@ietf.org <mailto:Lsr@ietf.org>
>     >>https://www.ietf.org/mailman/listinfo/lsr
>     >>
>     >> _______________________________________________
>     >> Lsr mailing list
>     >>Lsr@ietf.org <mailto:Lsr@ietf.org>
>     >>https://www.ietf.org/mailman/listinfo/lsr
>     >>
>     >
>     > _______________________________________________
>     > Lsr mailing list
>     >Lsr@ietf.org <mailto:Lsr@ietf.org>
>     >https://www.ietf.org/mailman/listinfo/lsr
>     >
>     > .
>     >
>
>     _______________________________________________
>     Lsr mailing list
>     Lsr@ietf.org <mailto:Lsr@ietf.org>
>     https://www.ietf.org/mailman/listinfo/lsr
>


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Subject: Re: [Lsr] OSPF/IS-IS Entropy Label Signaling Drafts
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From: "Ketan Talaulikar (ketant)" <ketant@cisco.com>
To: "Peter Psenak (ppsenak)" <ppsenak@cisco.com>, Aijun Wang <wangaijun@tsinghua.org.cn>, "'Rob Shakir'" <rjs@rob.sh>
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Date: Tue, 24 Jul 2018 11:44:40 +0000
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From: "Acee Lindem (acee)" <acee@cisco.com>
To: "Ketan Talaulikar (ketant)" <ketant@cisco.com>, "Peter Psenak (ppsenak)" <ppsenak@cisco.com>, Aijun Wang <wangaijun@tsinghua.org.cn>, "'Rob Shakir'" <rjs@rob.sh>
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Date: Tue, 24 Jul 2018 14:37:13 +0000
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From: "Ketan Talaulikar (ketant)" <ketant@cisco.com>
To: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>, "Les Ginsberg (ginsberg)" <ginsberg=40cisco.com@dmarc.ietf.org>, "Acee Lindem (acee)" <acee@cisco.com>, Christian Hopps <chopps@chopps.org>, "lsr@ietf.org" <lsr@ietf.org>
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From: "Ketan Talaulikar (ketant)" <ketant@cisco.com>
To: "Acee Lindem (acee)" <acee@cisco.com>, "Peter Psenak (ppsenak)" <ppsenak@cisco.com>, Aijun Wang <wangaijun@tsinghua.org.cn>, "'Rob Shakir'" <rjs@rob.sh>
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From: Rob Shakir <rjs@rob.sh>
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On 23 July 2018 at 23:37, Aijun Wang <wangaijun@tsinghua.org.cn> wrote:

>
>
> *To Rob: *
>
>
>
> BGP-LS is one prominent method to get the underlay network topology and
> has more flexibility to control the topology export as described in RFC
> 7752 <https://tools.ietf.org/html/rfc7752#section-1>.
>
>
>
> Solution 1) that you proposed is possible, but we will not run two
> different methods to get the topology.
>

What is the other method that you're running alongside an IGP adjacency?
This is a single method that just uses the IGP protocol that you have today.


> Solution 2) is also one possible deployment, but it eliminates the
> advantage of the BGP-LS, in which it needs several interaction points with
> the underlay network. and such deployment is not belong to redundancy
> category as information got from different areaes are different.
>

Yes, the information is different but this is why you have areas within the
IGP. Are you implying that your controller cannot merge topologies from
different areas? I'd suggest that this is something that is relatively
trivial to add into that code, rather than changing the code running on
your routers.


> Solution 3)--Streaming telemetry technology should be used mainly for the
> monitor of network devices, it requires the PCE controller to contact with
> every router in the network, is also not the optimal solution when compared
> with BGP-LS.
>

This is not true. LSDB export via streaming telemetry (for the entire LSDB)
is possible in today's running code with IS-IS, and models are written for
OSPF's LSDB. The controller just needs to interact with one device per area
per the existing discussion.

Assertion that this is not the optimal solution seems more like opinion to
me. Some justification would be useful for us to understand why the
existing solutions that are shipping aren't suitable. Why should we further
complicate protocols that ship for everyone if there is no technical reason
to do so?


>  We can update the current draft to include all possible scenarios that
> we are not aiming at beginning for integrity consideration. The proposed
> extension does not add to complexity of IGP. What we discussed here is the
> complexity of IGP protocol itself.
>

 You're asking for information that is explicitly partitioned (based on the
fact that your network is partitioned into areas) to be exported into an
area simply to reduce the number of adjacencies between a controller and
the network to N (where N is the redundancy of the controller) rather than
N*areas -- why is this the right trade-off?

r.

--0000000000002a9c7a0571c1294e
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><br><div class=3D"gmail_extra"><br><div class=3D"gmail_quo=
te">On 23 July 2018 at 23:37, Aijun Wang <span dir=3D"ltr">&lt;<a href=3D"m=
ailto:wangaijun@tsinghua.org.cn" target=3D"_blank">wangaijun@tsinghua.org.c=
n</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" style=3D"margi=
n:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div lang=3D"ZH-C=
N" link=3D"blue" vlink=3D"purple"><div class=3D"m_3999036541179811400WordSe=
ction1"><p class=3D"MsoNormal"><span style=3D"color:black;font-size:10pt">=
=C2=A0</span><br></p><p class=3D"MsoNormal"><u><span lang=3D"EN-US" style=
=3D"font-size:10.5pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;=
;color:#1f497d">To Rob: <u></u><u></u></span></u></p><p class=3D"MsoNormal"=
><span lang=3D"EN-US" style=3D"font-size:10.0pt;color:black"><u></u>=C2=A0<=
u></u></span></p><p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-=
size:10.0pt;color:black">BGP-LS is one prominent method to get the underlay=
 network topology and has more flexibility to control the topology export a=
s described in <a href=3D"https://tools.ietf.org/html/rfc7752#section-1" ta=
rget=3D"_blank">RFC 7752</a>. <u></u><u></u></span></p><p class=3D"MsoNorma=
l"><span lang=3D"EN-US" style=3D"font-size:10.0pt;color:black"><u></u>=C2=
=A0<u></u></span></p><p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"f=
ont-size:10.0pt;color:black">Solution 1) that you proposed is possible, but=
 we will not run two different methods to get the topology.</span></p></div=
></div></blockquote><div><br></div><div>What is the other method that you&#=
39;re running alongside an IGP adjacency? This is a single method that just=
 uses the IGP protocol that you have today.</div><div>=C2=A0</div><blockquo=
te class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc so=
lid;padding-left:1ex"><div lang=3D"ZH-CN" link=3D"blue" vlink=3D"purple"><d=
iv class=3D"m_3999036541179811400WordSection1"><p class=3D"MsoNormal"><span=
 lang=3D"EN-US" style=3D"font-size:10.0pt;color:black"><u></u><u></u></span=
></p><p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;=
color:black">Solution 2) is also one possible deployment, but it eliminates=
 the advantage of the BGP-LS, in which it needs several interaction points =
with the underlay network. and such deployment is not belong to redundancy =
category as information got from different areaes are different.</span></p>=
</div></div></blockquote><div><br></div><div>Yes, the information is differ=
ent but this is why you have areas within the IGP. Are you implying that yo=
ur controller cannot merge topologies from different areas? I&#39;d suggest=
 that this is something that is relatively trivial to add into that code, r=
ather than changing the code running on your routers.</div><div>=C2=A0</div=
><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1=
px #ccc solid;padding-left:1ex"><div lang=3D"ZH-CN" link=3D"blue" vlink=3D"=
purple"><div class=3D"m_3999036541179811400WordSection1"><p class=3D"MsoNor=
mal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;color:black"><u></u><u>=
</u></span></p><p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-si=
ze:10.0pt;color:black">Solution 3)--Streaming telemetry technology should b=
e used mainly for the monitor of network devices, it requires the PCE contr=
oller to contact with every router in the network, is also not the optimal =
solution when compared with BGP-LS.</span></p></div></div></blockquote><div=
><br></div><div>This is not true. LSDB export via streaming telemetry (for =
the entire LSDB) is possible in today&#39;s running code with IS-IS, and mo=
dels are written for OSPF&#39;s LSDB. The controller just needs to interact=
 with one device per area per the existing discussion.=C2=A0</div><div><br>=
</div><div>Assertion that this is not the optimal solution seems more like =
opinion to me. Some justification would be useful for us to understand why =
the existing solutions that are shipping aren&#39;t suitable. Why should we=
 further complicate protocols that ship for everyone if there is no technic=
al reason to do so?</div><div>=C2=A0</div><blockquote class=3D"gmail_quote"=
 style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><d=
iv lang=3D"ZH-CN" link=3D"blue" vlink=3D"purple"><div class=3D"m_3999036541=
179811400WordSection1"><p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D=
"font-size:10.0pt;color:black"><u></u><u></u></span></p><p class=3D"MsoNorm=
al"><span lang=3D"EN-US" style=3D"font-size:10.0pt;color:black"><u></u>=C2=
=A0</span><span style=3D"color:black;font-size:10pt">We can update the curr=
ent draft to include all possible scenarios that we are not aiming at begin=
ning for integrity consideration. The proposed extension does not add to co=
mplexity of IGP. What we discussed here is the complexity of IGP protocol i=
tself.</span></p></div></div></blockquote><div><font color=3D"#000000"><br>=
</font></div><div><font color=3D"#000000">=C2=A0You&#39;re asking for infor=
mation that is explicitly partitioned (based on the fact that your network =
is partitioned into areas) to be exported into an area simply to reduce the=
 number of adjacencies between a controller and the network to N (where N i=
s the redundancy of the controller) rather than N*areas -- why is this the =
right trade-off?</font></div><div><font color=3D"#000000"><br></font></div>=
<div><font color=3D"#000000">r.</font></div></div></div></div>

--0000000000002a9c7a0571c1294e--


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From: "Amanda Baber via RT" <iana-questions@iana.org>
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To: acee@cisco.com, aretana.ietf@gmail.com, draft-ietf-isis-segment-routing-msd@ietf.org, lsr@ietf.org
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Subject: [Lsr] [IANA #1117133] Early Allocation Request for "Signaling MSD (Maximum SID Depth) using IS-IS"
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Hi Acee,

We actually aren't able to create registries through the RFC 7120 early allocation process. We'll have to hold off until the IESG notifies us that they've approved the document for publication.

Best regards,
Amanda

On Tue Jul 24 14:50:47 2018, acee@cisco.com wrote:
> Hi Amanda, et al,
> 
> Can we get the registry for â€œIGP MSD Typesâ€� created as well? We now
> have another draft allocating a code point. The IS-IS TLVs have
> already been allocated through the early allocation process.
> 
> Hi Authors,
> 
> Please change â€œMSD Typesâ€� to â€œIGP MSD Typesâ€� in the IANA section
> consistent with other registries in the â€œInterior Gateway Protocol
> (IGP) Parametersâ€� registry grouping.
> 
> https://www.iana.org/assignments/igp-parameters/igp-
> parameters.xhtml#igp-algorithm-types
> 
> Thanks,
> Acee




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To: "iana-questions@iana.org" <iana-questions@iana.org>, "aretana.ietf@gmail.com" <aretana.ietf@gmail.com>, "draft-ietf-isis-segment-routing-msd@ietf.org" <draft-ietf-isis-segment-routing-msd@ietf.org>, "lsr@ietf.org" <lsr@ietf.org>
Thread-Topic: [IANA #1117133] Early Allocation Request for "Signaling MSD (Maximum SID Depth) using IS-IS"
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From nobody Tue Jul 24 13:55:08 2018
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Subject: Re: [Lsr] [IANA #1117133] Early Allocation Request for "Signaling MSD (Maximum SID Depth) using IS-IS"
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Hi Amanda, 

It seems to me that we created the RFC 7684 TLV registry via early allocation so that we could allocate code points from other drafts. 

If this is, in fact, the case, we'll need to manage the IGP MSD Type in the WG.

Thanks,
Acee 

ï»¿On 7/24/18, 4:25 PM, "Amanda Baber via RT" <iana-questions@iana.org> wrote:

    Hi Acee,
    
    We actually aren't able to create registries through the RFC 7120 early allocation process. We'll have to hold off until the IESG notifies us that they've approved the document for publication.
    
    Best regards,
    Amanda
    
    On Tue Jul 24 14:50:47 2018, acee@cisco.com wrote:
    > Hi Amanda, et al,
    > 
    > Can we get the registry for â€œIGP MSD Typesâ€� created as well? We now
    > have another draft allocating a code point. The IS-IS TLVs have
    > already been allocated through the early allocation process.
    > 
    > Hi Authors,
    > 
    > Please change â€œMSD Typesâ€� to â€œIGP MSD Typesâ€� in the IANA section
    > consistent with other registries in the â€œInterior Gateway Protocol
    > (IGP) Parametersâ€� registry grouping.
    > 
    > https://www.iana.org/assignments/igp-parameters/igp-
    > parameters.xhtml#igp-algorithm-types
    > 
    > Thanks,
    > Acee
    
    
    
    



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Subject: [Lsr] [IANA #1117133] Early Allocation Request for "Signaling MSD (Maximum SID Depth) using IS-IS"
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Hi Acee,

According to our logs, although we made individual registrations through the early allocation process, it looks like all of the RFC 7684 registries at https://www.iana.org/assignments/ospfv2-parameters were created in September 2015, after the document was approved by the IESG. 

Amanda

On Tue Jul 24 20:54:52 2018, acee@cisco.com wrote:
> Hi Amanda,
> 
> It seems to me that we created the RFC 7684 TLV registry via early
> allocation so that we could allocate code points from other drafts.
> 
> If this is, in fact, the case, we'll need to manage the IGP MSD Type
> in the WG.
> 
> Thanks,
>  Acee
> 
> ï»¿On 7/24/18, 4:25 PM, "Amanda Baber via RT" <iana-questions@iana.org>
> wrote:
> 
> Hi Acee,
> 
> We actually aren't able to create registries through the RFC 7120
> early allocation process. We'll have to hold off until the IESG
> notifies us that they've approved the document for publication.
> 
> Best regards,
> Amanda
> 
> On Tue Jul 24 14:50:47 2018, acee@cisco.com wrote:
> > Hi Amanda, et al,
> >
> > Can we get the registry for â€œIGP MSD Typesâ€� created as well? We now
> > have another draft allocating a code point. The IS-IS TLVs have
> > already been allocated through the early allocation process.
> >
> > Hi Authors,
> >
> > Please change â€œMSD Typesâ€� to â€œIGP MSD Typesâ€� in the IANA section
> > consistent with other registries in the â€œInterior Gateway Protocol
> > (IGP) Parametersâ€� registry grouping.
> >
> > https://www.iana.org/assignments/igp-parameters/igp-
> > parameters.xhtml#igp-algorithm-types
> >
> > Thanks,
> > Acee
> 
> 
> 
> 
> 




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Subject: [Lsr] I-D Action: draft-ietf-isis-segment-routing-msd-13.txt
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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           : Signaling MSD (Maximum SID Depth) using IS-IS
        Authors         : Jeff Tantsura
                          Uma Chunduri
                          Sam Aldrin
                          Les Ginsberg
	Filename        : draft-ietf-isis-segment-routing-msd-13.txt
	Pages           : 9
	Date            : 2018-07-24

Abstract:
   This document defines a way for an IS-IS Router to advertise multiple
   types of supported Maximum SID Depths (MSDs) at node and/or link
   granularity.  Such advertisements allow entities (e.g., centralized
   controllers) to determine whether a particular SID stack can be
   supported in a given network.  This document only defines one type of
   MSD maximum label imposition, but defines an encoding that can
   support other MSD types.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-isis-segment-routing-msd/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-isis-segment-routing-msd-13
https://datatracker.ietf.org/doc/html/draft-ietf-isis-segment-routing-msd-13

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-isis-segment-routing-msd-13


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/


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Date: Tue, 24 Jul 2018 15:53:37 -0700
From: Jeff Tantsura <jefftant.ietf@gmail.com>
To: <lsr@ietf.org>
Message-ID: <F55BA7EB-77BA-4DF2-9F4C-87C536DB8795@gmail.com>
Thread-Topic: [Lsr] I-D Action: draft-ietf-isis-segment-routing-msd-13.txt
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Subject: Re: [Lsr] I-D Action: draft-ietf-isis-segment-routing-msd-13.txt
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Folks,

The only update is the correct name for the registry - from "MSD Types" to =
"IGP MSD Types"

Cheers,
Jeff

=EF=BB=BFOn 7/24/18, 15:51, "lsr-bounces@ietf.org on behalf of internet-drafts@ie=
tf.org" <lsr-bounces@ietf.org on behalf of internet-drafts@ietf.org> wrote:

   =20
    A New Internet-Draft is available from the on-line Internet-Drafts dire=
ctories.
    This draft is a work item of the Link State Routing WG of the IETF.
   =20
            Title           : Signaling MSD (Maximum SID Depth) using IS-IS
            Authors         : Jeff Tantsura
                              Uma Chunduri
                              Sam Aldrin
                              Les Ginsberg
    	Filename        : draft-ietf-isis-segment-routing-msd-13.txt
    	Pages           : 9
    	Date            : 2018-07-24
   =20
    Abstract:
       This document defines a way for an IS-IS Router to advertise multipl=
e
       types of supported Maximum SID Depths (MSDs) at node and/or link
       granularity.  Such advertisements allow entities (e.g., centralized
       controllers) to determine whether a particular SID stack can be
       supported in a given network.  This document only defines one type o=
f
       MSD maximum label imposition, but defines an encoding that can
       support other MSD types.
   =20
   =20
    The IETF datatracker status page for this draft is:
    https://datatracker.ietf.org/doc/draft-ietf-isis-segment-routing-msd/
   =20
    There are also htmlized versions available at:
    https://tools.ietf.org/html/draft-ietf-isis-segment-routing-msd-13
    https://datatracker.ietf.org/doc/html/draft-ietf-isis-segment-routing-m=
sd-13
   =20
    A diff from the previous version is available at:
    https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-isis-segment-routing-msd-1=
3
   =20
   =20
    Please note that it may take a couple of minutes from the time of submi=
ssion
    until the htmlized version and diff are available at tools.ietf.org.
   =20
    Internet-Drafts are also available by anonymous FTP at:
    ftp://ftp.ietf.org/internet-drafts/
   =20
    _______________________________________________
    Lsr mailing list
    Lsr@ietf.org
    https://www.ietf.org/mailman/listinfo/lsr
   =20



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Subject: [Lsr] I-D Action: draft-ietf-ospf-segment-routing-msd-15.txt
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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           : Signaling MSD (Maximum SID Depth) using OSPF
        Authors         : Jeff Tantsura
                          Uma Chunduri
                          Sam Aldrin
                          Peter Psenak
	Filename        : draft-ietf-ospf-segment-routing-msd-15.txt
	Pages           : 10
	Date            : 2018-07-24

Abstract:
   This document defines a way for an OSPF Router to advertise multiple
   types of supported Maximum SID Depths (MSDs) at node and/or link
   granularity.  Such advertisements allow entities (e.g., centralized
   controllers) to determine whether a particular SID stack can be
   supported in a given network.  This document defines only one type of
   MSD, but defines an encoding that can support other MSD types.  Here
   the term OSPF means both OSPFv2 and OSPFv3.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-ospf-segment-routing-msd/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-ospf-segment-routing-msd-15
https://datatracker.ietf.org/doc/html/draft-ietf-ospf-segment-routing-msd-15

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-ospf-segment-routing-msd-15


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/


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From: "Aijun Wang" <wangaijun@tsinghua.org.cn>
To: "'Ketan Talaulikar \(ketant\)'" <ketant@cisco.com>, "'Acee Lindem \(acee\)'" <acee@cisco.com>, "'Peter Psenak \(ppsenak\)'" <ppsenak@cisco.com>, "'Rob Shakir'" <rjs@rob.sh>
Cc: "'Dongjie \(Jimmy\)'" <jie.dong@huawei.com>, <chopps@chopps.org>, <lsr@ietf.org>
References: <001601d42259$a860fff0$f922ffd0$@org.cn> <5B558E76.3010703@cisco.com> <003201d42265$cd011af0$670350d0$@org.cn> <5B55ABB5.60806@cisco.com> <003f01d42275$5ec00eb0$1c402c10$@org.cn> <5B55BC38.3050605@cisco.com> <CAHxMReYo_e+dDJ611X3eihV0WCToYqFDa2c+CLnfzhF8_L2YDA@mail.gmail.com> <003701d422ff$a1b203b0$e5160b10$@org.cn> <5B56E18C.4060903@cisco.com> <a1de561505bb4d46855dfadb3a59b239@XCH-ALN-008.cisco.com> <44287233-F703-4B4A-A70A-622AE7C1811D@cisco.com> <dd4a6c2e9825470ba1bd2c8cec76de11@XCH-ALN-008.cisco.com>
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Date: Wed, 25 Jul 2018 07:53:37 +0800
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Subject: [Lsr] =?utf-8?b?562U5aSNOiDnrZTlpI06ICAg562U5aSNOiAg562U5aSNOiBS?= =?utf-8?q?egarding_OSPF_extension_for_inter-area_topology_retrieval?=
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Hi, Ketan and Acee:

I am working on the other use cases of "Source Router ID" extension, =
which may corresponding to that in RFC7794. Once finished, I will update =
the draft.
RFC5392 and RFC5316 are for inter-AS TE extension, not inter-area =
scenario and solution that proposed in this draft.

-----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6-----
=E5=8F=91=E4=BB=B6=E4=BA=BA: Ketan Talaulikar (ketant) =
[mailto:ketant@cisco.com]=20
=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2018=E5=B9=B47=E6=9C=8824=E6=97=A5 =
23:56
=E6=94=B6=E4=BB=B6=E4=BA=BA: Acee Lindem (acee); Peter Psenak (ppsenak); =
Aijun Wang; 'Rob Shakir'
=E6=8A=84=E9=80=81: 'Dongjie (Jimmy)'; chopps@chopps.org; lsr@ietf.org
=E4=B8=BB=E9=A2=98: RE: =E7=AD=94=E5=A4=8D: [Lsr] =E7=AD=94=E5=A4=8D: =
=E7=AD=94=E5=A4=8D: Regarding OSPF extension for inter-area topology =
retrieval

Ack and IMHO the reference to this inter-AS use-case should be removed =
as it is very specific and works in very limited cases as opposed to =
rfc5392 which presented a proper OSPF solution for this specific problem =
(rfc5316 does same for IS-IS).

Thanks,
Ketan

-----Original Message-----
From: Acee Lindem (acee)=20
Sent: 24 July 2018 10:37
To: Ketan Talaulikar (ketant) <ketant@cisco.com>; Peter Psenak (ppsenak) =
<ppsenak@cisco.com>; Aijun Wang <wangaijun@tsinghua.org.cn>; 'Rob =
Shakir' <rjs@rob.sh>
Cc: 'Dongjie (Jimmy)' <jie.dong@huawei.com>; chopps@chopps.org; =
lsr@ietf.org
Subject: Re: =E7=AD=94=E5=A4=8D: [Lsr] =E7=AD=94=E5=A4=8D: =
=E7=AD=94=E5=A4=8D: Regarding OSPF extension for inter-area topology =
retrieval

Hi Ketan,=20

=EF=BB=BFOn 7/24/18, 7:44 AM, "Ketan Talaulikar (ketant)" =
<ketant@cisco.com> wrote:

    Hi Aijun,
   =20
    Your draft introduces the Source Router ID which is, by itself, an =
useful protocol extension.

I agree. What is the use case for advertisement in IS-IS? Perhaps this =
could be used as the primary motivation.=20


   However, the use-case on inter-as topology retrieval has issues which =
has been shared by many of us at the mike, offline and on the list.

And this could be moved to an appendix or even completely.=20

Thanks,
Acee=20
   =20
    Could you consider de-coupling the two?
   =20
    Also, if the proposal for learning inter-AS as described by you =
works for your own specific network design (and you don't think any of =
the points made affect that decision), then please go ahead. However, I =
do not see the point of trying to get that as an IETF document?
   =20
    Thanks,
    Ketan
   =20
    -----Original Message-----
    From: Peter Psenak (ppsenak)=20
    Sent: 24 July 2018 04:22
    To: Aijun Wang <wangaijun@tsinghua.org.cn>; 'Rob Shakir' =
<rjs@rob.sh>
    Cc: 'Dongjie (Jimmy)' <jie.dong@huawei.com>; chopps@chopps.org; =
Ketan Talaulikar (ketant) <ketant@cisco.com>; lsr@ietf.org; Acee Lindem =
(acee) <acee@cisco.com>
    Subject: Re: =E7=AD=94=E5=A4=8D: [Lsr] =E7=AD=94=E5=A4=8D: =
=E7=AD=94=E5=A4=8D: Regarding OSPF extension for inter-area topology =
retrieval
   =20
    Hi Aijun,
   =20
    On 24/07/18 05:37 , Aijun Wang wrote:
    > _Hi, Peter:_
    >
    > For point-to-point interface, as described in  OSPFv2(RFC2328 =
12.4.1.1.  Describing point-to-point interfaces)  =
<https://tools.ietf.org/html/rfc2328#page-130>, the router LSA will =
include two links description for each interface, within which the =
=E2=80=9Ctype 3 link=E2=80=9D(stub network) will describe the subnet =
mask of the point-to-point interface.
    >
    > For broadcast/NBMA interface, the DR will be elected and it will=20
    > generate the network LSA which will include also the subnet mask =
of=20
    > the connected interface.
    >
    > For unnumbered and virtual link, if you consider we should include =

    > them also for all possible scenarios even if we seldom use them in =

    > large network, we can consider expand the summary LSA to cover it, =
as=20
    > done by this draft.
   =20
    there is no way to address unnumbered p2p case your way, because =
there is no Summary LSA generated to other area in such case.
   =20
    Anyway, reconstructing a topology of a remote area based on the =
prefix announcements that come from it is a broken concept. I have given =
you several examples where your proposal does not work.
   =20
    thanks,
    Peter
   =20
    >
    > For Anycast prefixes situation that you described(although we =
seldom=20
    > plan our network in such way), the PCE controller will not deduce =
the=20
    > wrong information from the reported information------Different =
router=20
    > advertise the same prefix, why can=E2=80=99t they be connected in =
logically?
    >
    > On summary, the ABR can know and report the originator of the=20
    > connected interface=E2=80=99s prefixes, and also the connected =
information for=20
    > the unnumbered/virtual link from the traditional router =
LSA/network=20
    > LSA message, thus can transfer them to the router that run BGP-LS, =

    > then to the PCE controller to retrieval the topology.
    >
    > _To Rob: _
    >
    > BGP-LS is one prominent method to get the underlay network =
topology=20
    > and has more flexibility to control the topology export as =
described=20
    > in RFC
    > 7752 <https://tools.ietf.org/html/rfc7752#section-1>.
    >
    > Solution 1) that you proposed is possible, but we will not run two =

    > different methods to get the topology.
    >
    > Solution 2) is also one possible deployment, but it eliminates the =

    > advantage of the BGP-LS, in which it needs several interaction =
points=20
    > with the underlay network. and such deployment is not belong to=20
    > redundancy category as information got from different areaes are =
different.
    >
    > Solution 3)--Streaming telemetry technology should be used mainly =
for=20
    > the monitor of network devices, it requires the PCE controller to=20
    > contact with every router in the network, is also not the optimal=20
    > solution when compared with BGP-LS.
    >
    > We can update the current draft to include all possible scenarios =
that=20
    > we are not aiming at beginning for integrity consideration. The=20
    > proposed extension does not add to complexity of IGP. What we=20
    > discussed here is the complexity of IGP protocol itself.
    >
    > Best Regards.
    >
    > Aijun Wang
    >
    > Network R&D and Operation Support Department
    >
    > China Telecom Corporation Limited Beijing Research =
Institute,Beijing, China.
    >
    > *=E5=8F=91=E4=BB=B6=E4=BA=BA:*Rob Shakir [mailto:rjs@rob.sh]
    > =
*=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4:*2018=E5=B9=B47=E6=9C=8824=E6=97=A5=
7:04
    > *=E6=94=B6=E4=BB=B6=E4=BA=BA:*Peter Psenak
    > *=E6=8A=84=E9=80=81:*Dongjie (Jimmy); chopps@chopps.org; Ketan =
Talaulikar (ketant);=20
    > Aijun Wang; lsr@ietf.org; Acee Lindem (acee)
    > *=E4=B8=BB=E9=A2=98:*Re: [Lsr] =E7=AD=94=E5=A4=8D: =
=E7=AD=94=E5=A4=8D: Regarding OSPF extension for inter-area=20
    > topology retrieval
    >
    > +1 to Peter. We should not define fragile solutions within the =
IETF.
    >
    > There are also a multitude of other solutions here already:
    >
    > 1) IGP adjacency with one router in each area (at a minimum - =
probably=20
    > two for a robust system) over a tunnel. Deployed in many networks =
for=20
    > years.
    > 2) BGP-LS to one router (ditto robustness comment) in each area.
    > 3) streaming telemetry of the LSDB contents via gNMI.
    >
    > All these solutions exist in shipping implementations - please =
let=E2=80=99s=20
    > not add to the system complexity of the IGP here.
    >
    > r.
    >
    > On Mon, Jul 23, 2018 at 12:30 Peter Psenak=20
    > <ppsenak=3D40cisco.com@dmarc.ietf.org=20
    > <mailto:40cisco.com@dmarc.ietf.org>>
    > wrote:
    >
    >     Hi Aijun,
    >
    >     On 23/07/18 13:07 , Aijun Wang wrote:
    >     > Hi, Peter:
    >     >
    >     > For routers that connected by LAN, the router will establish =
adjacent
    >     > neighbor with DR, but not only DR advertises the connected =
prefixes.
    >
    >     only the Network LSA includes the network mask, other routers =
would
    >     include the interface address only.
    >
    >
    >     > DR and
    >     > DRother will all advertise type 1 and type 2 LSA with each =
other, then the
    >     > process and proposal described in this draft will still =
work.
    >     > We seldom use the ip unnumbered features in our network, can =
we ignore it
    >     > then? Or other persons has some idea on such situation?
    >
    >     the fact that you do not use unnumbered is not really =
relevant. IETF
    >     defines solutions that MUST work for all possible scenarios, =
not only
    >     for a specific one.
    >
    >     > Anycast prefixes are often /32 long, this can be easily =
filtered by SDN
    >     > controller because the link prefixes between two routers =
will be no larger
    >     > than /32 for IPv4 network.
    >
    >     protocol allows to advertise the same prefix with an arbitrary =
mask from
    >     multiple routers without these routers being directly =
connected. Your
    >     proposal is based on the assumptions that are incorrect.
    >
    >     thanks,
    >     Peter
    >
    >     >
    >     > Best Regards.
    >     >
    >     > Aijun Wang
    >     > Network R&D and Operation Support Department
    >     > China Telecom Corporation Limited Beijing Research =
Institute,Beijing, China.
    >     >
    >     > -----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6-----
    >     >=E5=8F=91=E4=BB=B6=E4=BA=BA: Peter Psenak [mailto:ppsenak
    >     <mailto:ppsenak>=3D40cisco.com@dmarc.ietf.org
    >     <mailto:40cisco.com@dmarc.ietf.org>]
    >     >=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: =
2018=E5=B9=B47=E6=9C=8823=E6=97=A518:20
    >     >=E6=94=B6=E4=BB=B6=E4=BA=BA: Aijun Wang; 'Peter Psenak'; =
chopps@chopps.org
    >     <mailto:chopps@chopps.org>
    >     >=E6=8A=84=E9=80=81: lsr@ietf.org <mailto:lsr@ietf.org>; =
'Ketan Talaulikar
    >     (ketant)'; 'Acee Lindem (acee)';
    >     > 'Dongjie (Jimmy)'
    >     >=E4=B8=BB=E9=A2=98: Re: [Lsr] =E7=AD=94=E5=A4=8D: Regarding =
OSPF extension for inter-area topology
    >     > retrieval
    >     >
    >     > Hi Aijun,
    >     >
    >     > On 23/07/18 11:16 , Aijun Wang wrote:
    >     >> Hi, Peter:
    >     >>
    >     >> Actually, I consider mainly the point-to-point connection =
and the
    >     >> numbered interface, which are normal in our network.
    >     >> For the two situations that you mentioned, I will =
investigation the
    >     >> possible solutions and feedback you later.
    >     >>
    >     >> For the point-to-point and numbered interface, do you have =
other
    >     >> questions then?
    >     >
    >     > the fact that two routers announce the same subnet, does not =
mean they are
    >     > connected together by p2p link. Anycast prefix is an =
example.
    >     >
    >     > The idea you are proposing simply does not work.
    >     >
    >     > thanks,
    >     > Peter
    >     >
    >     >
    >     >>
    >     >> Best Regards.
    >     >>
    >     >> Aijun Wang
    >     >> Network R&D and Operation Support Department China Telecom =
Corporation
    >     >> Limited Beijing Research Institute,Beijing, China.
    >     >>
    >     >> -----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6-----
    >     >>=E5=8F=91=E4=BB=B6=E4=BA=BA: Peter Psenak [mailto:ppsenak
    >     <mailto:ppsenak>=3D40cisco.com@dmarc.ietf.org
    >     <mailto:40cisco.com@dmarc.ietf.org>]
    >     >>=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: =
2018=E5=B9=B47=E6=9C=8823=E6=97=A516:15
    >     >>=E6=94=B6=E4=BB=B6=E4=BA=BA: Aijun Wang; chopps@chopps.org =
<mailto:chopps@chopps.org>
    >     >>=E6=8A=84=E9=80=81: lsr@ietf.org <mailto:lsr@ietf.org>; =
'Ketan Talaulikar
    >     (ketant)'; 'Acee Lindem (acee)';
    >     >> 'Dongjie (Jimmy)'
    >     >>=E4=B8=BB=E9=A2=98: Re: [Lsr] Regarding OSPF extension for =
inter-area topology
    >     >> retrieval
    >     >>
    >     >> Hi Aijun,
    >     >>
    >     >> you are trying to reconstruct the topology of the remote =
area based on
    >     >> the fact that two routers are connected to the same subnet. =
It does
    >     >> not work
    >     >> because:
    >     >>
    >     >> 1. connections between routers can be unnumbered 2. routers =
can be
    >     >> connected via LAN, in which case only DR announces the =
prefix.
    >     >>
    >     >> In summary, what you propose does not work.
    >     >>
    >     >> thanks,
    >     >> Peter
    >     >>
    >     >>
    >     >>
    >     >> On 23/07/18 09:49 , Aijun Wang wrote:
    >     >>> (Sorry for my previous mail sent wrongly to the IDR mail =
list, please
    >     >>> reply on this thread within the LSR wg)
    >     >>>
    >     >>> Hi, Peter:
    >     >>>
    >     >>> I am Aijun Wang from China Telecom, the author of draft =
about =E2=80=9COSPF
    >     >>> extension for inter-area topology retrieval=E2=80=9D
    >     >>> =
<https://datatracker.ietf.org/doc/draft-wang-lsr-ospf-inter-area-topo
    >     >>> l ogy-ext/>, which is presented by Mr.Jie Dong during the =
IETF102
    >     >>> meeting.
    >     >>>
    >     >>> Thanks for your comments on the presentation material
    >     >>>
    >     >> =
<https://datatracker.ietf.org/meeting/102/materials/slides-102-lsr-osp
    >     >> f-inte
    >     >> r-area-topology-retrieval-00>.
    >     >>>
    >     >>> Below are my explanation that regarding to the question =
about =E2=80=9Chow it
    >     >>> retrievals the inter-area topology based on the extension =
information=E2=80=9D:
    >     >>>
    >     >>> Let=E2=80=99s see the graph that illustrates in Fig.1 at =
section 3
    >     >>> =
<https://tools.ietf.org/html/draft-wang-lsr-ospf-inter-area-topology-
    >     >>> e xt-00#section-3> of the draft(I copy it also below for =
your
    >     >>> conveniences ):
    >     >>>
    >     >>> Assuming we want to rebuild the connection between router =
S1 and
    >     >>> router
    >     >>> S2 that locates in area 1:
    >     >>>
    >     >>> 1)Normally, router S1 will advertise prefix N1 within its =
router LSA
    >     >>>
    >     >>> 2)When this router LSA reaches the ABR router R1, it will =
convert it
    >     >>> into summary LSA, add the =E2=80=9CSource Router =
Information=E2=80=9D, which is
    >     >>> router id of S1 in this example, as proposed in this =
draft.
    >     >>>
    >     >>> 3)R1 then floods this extension summary LSA to R0, which =
is running
    >     >>> BGP-LS protocol with IP SDN Controller. The controller =
then knows the
    >     >>> prefixes of N1 is from S1.
    >     >>>
    >     >>> 4)Router S2 will do the similar process, and the =
controller will also
    >     >>> knows the prefixes N1 is also from S2
    >     >>>
    >     >>> 5)Then it can reconstruct the connection between S1 and =
S2, which
    >     >>> prefix is N1. The topology within Area 1 can then be =
recovered
    >     >> accordingly.
    >     >>>
    >     >>> Does the above explanation can answer your question. if =
so, I can add
    >     >>> it into the context of this draft in updated version.
    >     >>>
    >     >>> Best Regards.
    >     >>>
    >     >>> Aijun Wang
    >     >>>
    >     >>> Network R&D and Operation Support Department
    >     >>>
    >     >>> China Telecom Corporation Limited Beijing Research =
Institute,Beijing,
    >     >> China.
    >     >>>
    >     >>
    >     >> _______________________________________________
    >     >> Lsr mailing list
    >     >>Lsr@ietf.org <mailto:Lsr@ietf.org>
    >     >>https://www.ietf.org/mailman/listinfo/lsr
    >     >>
    >     >> _______________________________________________
    >     >> Lsr mailing list
    >     >>Lsr@ietf.org <mailto:Lsr@ietf.org>
    >     >>https://www.ietf.org/mailman/listinfo/lsr
    >     >>
    >     >
    >     > _______________________________________________
    >     > Lsr mailing list
    >     >Lsr@ietf.org <mailto:Lsr@ietf.org>
    >     >https://www.ietf.org/mailman/listinfo/lsr
    >     >
    >     > .
    >     >
    >
    >     _______________________________________________
    >     Lsr mailing list
    >     Lsr@ietf.org <mailto:Lsr@ietf.org>
    >     https://www.ietf.org/mailman/listinfo/lsr
    >
   =20
   =20



From nobody Tue Jul 24 19:58:54 2018
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Subject: [Lsr] I-D Action: draft-ietf-isis-mpls-elc-04.txt
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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           : Signaling Entropy Label Capability and Entropy Readable Label Depth Using IS-IS
        Authors         : Xiaohu Xu
                          Sriganesh Kini
                          Siva Sivabalan
                          Clarence Filsfils
                          Stephane Litkowski
	Filename        : draft-ietf-isis-mpls-elc-04.txt
	Pages           : 6
	Date            : 2018-07-24

Abstract:
   Multiprotocol Label Switching (MPLS) has defined a mechanism to load
   balance traffic flows using Entropy Labels (EL).  An ingress Label
   Switching Router (LSR) cannot insert ELs for packets going into a
   given tunnel unless an egress LSR has indicated via signaling that it
   has the capability of processing ELs, referred to as Entropy Label
   Capability (ELC), on that tunnel.  In addition, it would be useful
   for ingress LSRs to know each LSR's capability of reading the maximum
   label stack depth and performing EL-based load-balancing, referred to
   as Entropy Readable Label Depth (ERLD), in the cases where stacked
   LSPs are used for whatever reasons.  This document defines mechanisms
   to signal these two capabilities using IS-IS.  These mechanisms are
   useful when the label advertisement is also done via IS-IS.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-isis-mpls-elc/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-isis-mpls-elc-04
https://datatracker.ietf.org/doc/html/draft-ietf-isis-mpls-elc-04

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-isis-mpls-elc-04


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:
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From nobody Tue Jul 24 20:40:13 2018
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From: "Aijun Wang" <wangaijun@tsinghua.org.cn>
To: "'Peter Psenak'" <ppsenak=40cisco.com@dmarc.ietf.org>, "'Rob Shakir'" <rjs@rob.sh>
Cc: "'Dongjie \(Jimmy\)'" <jie.dong@huawei.com>, "'Ketan Talaulikar \(ketant\)'" <ketant@cisco.com>, <chopps@chopps.org>, "'Acee Lindem \(acee\)'" <acee@cisco.com>, <lsr@ietf.org>
References: <001601d42259$a860fff0$f922ffd0$@org.cn> <5B558E76.3010703@cisco.com> <003201d42265$cd011af0$670350d0$@org.cn> <5B55ABB5.60806@cisco.com> <003f01d42275$5ec00eb0$1c402c10$@org.cn> <5B55BC38.3050605@cisco.com> <CAHxMReYo_e+dDJ611X3eihV0WCToYqFDa2c+CLnfzhF8_L2YDA@mail.gmail.com> <003701d422ff$a1b203b0$e5160b10$@org.cn> <5B56E18C.4060903@cisco.com>
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Subject: [Lsr] =?utf-8?b?562U5aSNOiAgIOetlOWkjTogICDnrZTlpI06IOetlOWkjTog?= =?utf-8?q?Regarding_OSPF_extension_for_inter-area_topology_retrieval?=
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Hi, Peter:

Actually, only the unnumbered scenario that you insisted has no =
straightforward solution for the topology reconstruction. As I had =
explained previously, unnumbered interface deployment is very seldom =
within our network, because it is unavailable for remote testing and =
management.
If we still need to cover it, one viable way is to let "summary LSA" =
also announced it, with "Link State ID" is identical to the neighboring =
router, and the proposed "source router ID" is the original router =
itself. PCE/SDN controller can then recognize and reconstruct the =
topology correctly under such scenario.

>From the view of other point, let the "summary LSA" carry the "source =
router ID" can aid us reconstruct the underlay multi-area topology in =
most of common scenario, will do no harm to the traditional IGP flooding =
and SPF calculation. I am also investigating other use case of this =
extension as suggested by Acee and Ketan.

Very thanks for your comments to this draft again, and wish you can work =
together with us for the suitable solution.


Best Regards.

Aijun Wang
Network R&D and Operation Support Department
China Telecom Corporation Limited Beijing Research Institute,Beijing, =
China.

-----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6-----
=E5=8F=91=E4=BB=B6=E4=BA=BA: Peter Psenak =
[mailto:ppsenak=3D40cisco.com@dmarc.ietf.org]=20
=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2018=E5=B9=B47=E6=9C=8824=E6=97=A5 =
16:22
=E6=94=B6=E4=BB=B6=E4=BA=BA: Aijun Wang; 'Rob Shakir'
=E6=8A=84=E9=80=81: 'Dongjie (Jimmy)'; 'Ketan Talaulikar (ketant)'; =
chopps@chopps.org; 'Acee Lindem (acee)'; lsr@ietf.org
=E4=B8=BB=E9=A2=98: Re: [Lsr] =E7=AD=94=E5=A4=8D: =E7=AD=94=E5=A4=8D: =
=E7=AD=94=E5=A4=8D: Regarding OSPF extension for inter-area topology =
retrieval

Hi Aijun,

On 24/07/18 05:37 , Aijun Wang wrote:
> _Hi, Peter:_
>
> For point-to-point interface, as described in  OSPFv2(RFC2328 =
12.4.1.1.  Describing point-to-point interfaces)  =
<https://tools.ietf.org/html/rfc2328#page-130>, the router LSA will =
include two links description for each interface, within which the =
=E2=80=9Ctype 3 link=E2=80=9D(stub network) will describe the subnet =
mask of the point-to-point interface.
>
> For broadcast/NBMA interface, the DR will be elected and it will=20
> generate the network LSA which will include also the subnet mask of=20
> the connected interface.
>
> For unnumbered and virtual link, if you consider we should include=20
> them also for all possible scenarios even if we seldom use them in=20
> large network, we can consider expand the summary LSA to cover it, as=20
> done by this draft.

there is no way to address unnumbered p2p case your way, because there =
is no Summary LSA generated to other area in such case.

Anyway, reconstructing a topology of a remote area based on the prefix =
announcements that come from it is a broken concept. I have given you =
several examples where your proposal does not work.

thanks,
Peter

>
> For Anycast prefixes situation that you described(although we seldom=20
> plan our network in such way), the PCE controller will not deduce the=20
> wrong information from the reported information------Different router=20
> advertise the same prefix, why can=E2=80=99t they be connected in =
logically?
>
> On summary, the ABR can know and report the originator of the=20
> connected interface=E2=80=99s prefixes, and also the connected =
information for=20
> the unnumbered/virtual link from the traditional router LSA/network=20
> LSA message, thus can transfer them to the router that run BGP-LS,=20
> then to the PCE controller to retrieval the topology.
>
> _To Rob: _
>
> BGP-LS is one prominent method to get the underlay network topology=20
> and has more flexibility to control the topology export as described=20
> in RFC
> 7752 <https://tools.ietf.org/html/rfc7752#section-1>.
>
> Solution 1) that you proposed is possible, but we will not run two=20
> different methods to get the topology.
>
> Solution 2) is also one possible deployment, but it eliminates the=20
> advantage of the BGP-LS, in which it needs several interaction points=20
> with the underlay network. and such deployment is not belong to=20
> redundancy category as information got from different areaes are =
different.
>
> Solution 3)--Streaming telemetry technology should be used mainly for=20
> the monitor of network devices, it requires the PCE controller to=20
> contact with every router in the network, is also not the optimal=20
> solution when compared with BGP-LS.
>
> We can update the current draft to include all possible scenarios that =

> we are not aiming at beginning for integrity consideration. The=20
> proposed extension does not add to complexity of IGP. What we=20
> discussed here is the complexity of IGP protocol itself.
>
> Best Regards.
>
> Aijun Wang
>
> Network R&D and Operation Support Department
>
> China Telecom Corporation Limited Beijing Research Institute,Beijing, =
China.
>
> *=E5=8F=91=E4=BB=B6=E4=BA=BA:*Rob Shakir [mailto:rjs@rob.sh]
> =
*=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4:*2018=E5=B9=B47=E6=9C=8824=E6=97=A5=
7:04
> *=E6=94=B6=E4=BB=B6=E4=BA=BA:*Peter Psenak
> *=E6=8A=84=E9=80=81:*Dongjie (Jimmy); chopps@chopps.org; Ketan =
Talaulikar (ketant);=20
> Aijun Wang; lsr@ietf.org; Acee Lindem (acee)
> *=E4=B8=BB=E9=A2=98:*Re: [Lsr] =E7=AD=94=E5=A4=8D: =E7=AD=94=E5=A4=8D: =
Regarding OSPF extension for inter-area=20
> topology retrieval
>
> +1 to Peter. We should not define fragile solutions within the IETF.
>
> There are also a multitude of other solutions here already:
>
> 1) IGP adjacency with one router in each area (at a minimum - probably =

> two for a robust system) over a tunnel. Deployed in many networks for=20
> years.
> 2) BGP-LS to one router (ditto robustness comment) in each area.
> 3) streaming telemetry of the LSDB contents via gNMI.
>
> All these solutions exist in shipping implementations - please =
let=E2=80=99s=20
> not add to the system complexity of the IGP here.
>
> r.
>
> On Mon, Jul 23, 2018 at 12:30 Peter Psenak=20
> <ppsenak=3D40cisco.com@dmarc.ietf.org=20
> <mailto:40cisco.com@dmarc.ietf.org>>
> wrote:
>
>     Hi Aijun,
>
>     On 23/07/18 13:07 , Aijun Wang wrote:
>     > Hi, Peter:
>     >
>     > For routers that connected by LAN, the router will establish =
adjacent
>     > neighbor with DR, but not only DR advertises the connected =
prefixes.
>
>     only the Network LSA includes the network mask, other routers =
would
>     include the interface address only.
>
>
>     > DR and
>     > DRother will all advertise type 1 and type 2 LSA with each =
other, then the
>     > process and proposal described in this draft will still work.
>     > We seldom use the ip unnumbered features in our network, can we =
ignore it
>     > then? Or other persons has some idea on such situation?
>
>     the fact that you do not use unnumbered is not really relevant. =
IETF
>     defines solutions that MUST work for all possible scenarios, not =
only
>     for a specific one.
>
>     > Anycast prefixes are often /32 long, this can be easily filtered =
by SDN
>     > controller because the link prefixes between two routers will be =
no larger
>     > than /32 for IPv4 network.
>
>     protocol allows to advertise the same prefix with an arbitrary =
mask from
>     multiple routers without these routers being directly connected. =
Your
>     proposal is based on the assumptions that are incorrect.
>
>     thanks,
>     Peter
>
>     >
>     > Best Regards.
>     >
>     > Aijun Wang
>     > Network R&D and Operation Support Department
>     > China Telecom Corporation Limited Beijing Research =
Institute,Beijing, China.
>     >
>     > -----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6-----
>     >=E5=8F=91=E4=BB=B6=E4=BA=BA: Peter Psenak [mailto:ppsenak
>     <mailto:ppsenak>=3D40cisco.com@dmarc.ietf.org
>     <mailto:40cisco.com@dmarc.ietf.org>]
>     >=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: =
2018=E5=B9=B47=E6=9C=8823=E6=97=A518:20
>     >=E6=94=B6=E4=BB=B6=E4=BA=BA: Aijun Wang; 'Peter Psenak'; =
chopps@chopps.org
>     <mailto:chopps@chopps.org>
>     >=E6=8A=84=E9=80=81: lsr@ietf.org <mailto:lsr@ietf.org>; 'Ketan =
Talaulikar
>     (ketant)'; 'Acee Lindem (acee)';
>     > 'Dongjie (Jimmy)'
>     >=E4=B8=BB=E9=A2=98: Re: [Lsr] =E7=AD=94=E5=A4=8D: Regarding OSPF =
extension for inter-area topology
>     > retrieval
>     >
>     > Hi Aijun,
>     >
>     > On 23/07/18 11:16 , Aijun Wang wrote:
>     >> Hi, Peter:
>     >>
>     >> Actually, I consider mainly the point-to-point connection and =
the
>     >> numbered interface, which are normal in our network.
>     >> For the two situations that you mentioned, I will investigation =
the
>     >> possible solutions and feedback you later.
>     >>
>     >> For the point-to-point and numbered interface, do you have =
other
>     >> questions then?
>     >
>     > the fact that two routers announce the same subnet, does not =
mean they are
>     > connected together by p2p link. Anycast prefix is an example.
>     >
>     > The idea you are proposing simply does not work.
>     >
>     > thanks,
>     > Peter
>     >
>     >
>     >>
>     >> Best Regards.
>     >>
>     >> Aijun Wang
>     >> Network R&D and Operation Support Department China Telecom =
Corporation
>     >> Limited Beijing Research Institute,Beijing, China.
>     >>
>     >> -----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6-----
>     >>=E5=8F=91=E4=BB=B6=E4=BA=BA: Peter Psenak [mailto:ppsenak
>     <mailto:ppsenak>=3D40cisco.com@dmarc.ietf.org
>     <mailto:40cisco.com@dmarc.ietf.org>]
>     >>=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: =
2018=E5=B9=B47=E6=9C=8823=E6=97=A516:15
>     >>=E6=94=B6=E4=BB=B6=E4=BA=BA: Aijun Wang; chopps@chopps.org =
<mailto:chopps@chopps.org>
>     >>=E6=8A=84=E9=80=81: lsr@ietf.org <mailto:lsr@ietf.org>; 'Ketan =
Talaulikar
>     (ketant)'; 'Acee Lindem (acee)';
>     >> 'Dongjie (Jimmy)'
>     >>=E4=B8=BB=E9=A2=98: Re: [Lsr] Regarding OSPF extension for =
inter-area topology
>     >> retrieval
>     >>
>     >> Hi Aijun,
>     >>
>     >> you are trying to reconstruct the topology of the remote area =
based on
>     >> the fact that two routers are connected to the same subnet. It =
does
>     >> not work
>     >> because:
>     >>
>     >> 1. connections between routers can be unnumbered 2. routers can =
be
>     >> connected via LAN, in which case only DR announces the prefix.
>     >>
>     >> In summary, what you propose does not work.
>     >>
>     >> thanks,
>     >> Peter
>     >>
>     >>
>     >>
>     >> On 23/07/18 09:49 , Aijun Wang wrote:
>     >>> (Sorry for my previous mail sent wrongly to the IDR mail list, =
please
>     >>> reply on this thread within the LSR wg)
>     >>>
>     >>> Hi, Peter:
>     >>>
>     >>> I am Aijun Wang from China Telecom, the author of draft about =
=E2=80=9COSPF
>     >>> extension for inter-area topology retrieval=E2=80=9D
>     >>> =
<https://datatracker.ietf.org/doc/draft-wang-lsr-ospf-inter-area-topo
>     >>> l ogy-ext/>, which is presented by Mr.Jie Dong during the =
IETF102
>     >>> meeting.
>     >>>
>     >>> Thanks for your comments on the presentation material
>     >>>
>     >> =
<https://datatracker.ietf.org/meeting/102/materials/slides-102-lsr-osp
>     >> f-inte
>     >> r-area-topology-retrieval-00>.
>     >>>
>     >>> Below are my explanation that regarding to the question about =
=E2=80=9Chow it
>     >>> retrievals the inter-area topology based on the extension =
information=E2=80=9D:
>     >>>
>     >>> Let=E2=80=99s see the graph that illustrates in Fig.1 at =
section 3
>     >>> =
<https://tools.ietf.org/html/draft-wang-lsr-ospf-inter-area-topology-
>     >>> e xt-00#section-3> of the draft(I copy it also below for your
>     >>> conveniences ):
>     >>>
>     >>> Assuming we want to rebuild the connection between router S1 =
and
>     >>> router
>     >>> S2 that locates in area 1:
>     >>>
>     >>> 1)Normally, router S1 will advertise prefix N1 within its =
router LSA
>     >>>
>     >>> 2)When this router LSA reaches the ABR router R1, it will =
convert it
>     >>> into summary LSA, add the =E2=80=9CSource Router =
Information=E2=80=9D, which is
>     >>> router id of S1 in this example, as proposed in this draft.
>     >>>
>     >>> 3)R1 then floods this extension summary LSA to R0, which is =
running
>     >>> BGP-LS protocol with IP SDN Controller. The controller then =
knows the
>     >>> prefixes of N1 is from S1.
>     >>>
>     >>> 4)Router S2 will do the similar process, and the controller =
will also
>     >>> knows the prefixes N1 is also from S2
>     >>>
>     >>> 5)Then it can reconstruct the connection between S1 and S2, =
which
>     >>> prefix is N1. The topology within Area 1 can then be recovered
>     >> accordingly.
>     >>>
>     >>> Does the above explanation can answer your question. if so, I =
can add
>     >>> it into the context of this draft in updated version.
>     >>>
>     >>> Best Regards.
>     >>>
>     >>> Aijun Wang
>     >>>
>     >>> Network R&D and Operation Support Department
>     >>>
>     >>> China Telecom Corporation Limited Beijing Research =
Institute,Beijing,
>     >> China.
>     >>>
>     >>
>     >> _______________________________________________
>     >> Lsr mailing list
>     >>Lsr@ietf.org <mailto:Lsr@ietf.org>
>     >>https://www.ietf.org/mailman/listinfo/lsr
>     >>
>     >> _______________________________________________
>     >> Lsr mailing list
>     >>Lsr@ietf.org <mailto:Lsr@ietf.org>
>     >>https://www.ietf.org/mailman/listinfo/lsr
>     >>
>     >
>     > _______________________________________________
>     > Lsr mailing list
>     >Lsr@ietf.org <mailto:Lsr@ietf.org>
>     >https://www.ietf.org/mailman/listinfo/lsr
>     >
>     > .
>     >
>
>     _______________________________________________
>     Lsr mailing list
>     Lsr@ietf.org <mailto:Lsr@ietf.org>
>     https://www.ietf.org/mailman/listinfo/lsr
>

_______________________________________________
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From: "Aijun Wang" <wangaijun@tsinghua.org.cn>
To: "'Rob Shakir'" <rjs@rob.sh>
Cc: "'Dongjie \(Jimmy\)'" <jie.dong@huawei.com>, <chopps@chopps.org>, "'Peter Psenak'" <ppsenak=40cisco.com@dmarc.ietf.org>, "'Ketan Talaulikar \(ketant\)'" <ketant@cisco.com>, <lsr@ietf.org>, "'Acee Lindem \(acee\)'" <acee@cisco.com>
References: <001601d42259$a860fff0$f922ffd0$@org.cn> <5B558E76.3010703@cisco.com> <003201d42265$cd011af0$670350d0$@org.cn> <5B55ABB5.60806@cisco.com> <003f01d42275$5ec00eb0$1c402c10$@org.cn> <5B55BC38.3050605@cisco.com> <CAHxMReYo_e+dDJ611X3eihV0WCToYqFDa2c+CLnfzhF8_L2YDA@mail.gmail.com> <003701d422ff$a1b203b0$e5160b10$@org.cn> <CAHxMReYfC_e3VM=uak5Uasxy-dM4pYUKycj97inp8Vou4e5GaQ@mail.gmail.com>
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Hi, Rob:

=20

If we use BGP-LS to get the underlay topology, we will not consider =
deployment other methods such as IGP adjacency or LSDB telemetry, =
although all of them are applicable.

If we deploy BGP-LS adjacency with routers in multi-area to get the full =
multi-area topology, it will be no different with the traditional IGP =
adjacency, increase the complexity that BGP-LS solution itself can =
reduce.

=20

On the other hand, if we do not solve such scenario, isn=E2=80=99t =
BGP-LS one complete solution for underlay IGP topology gathering?

=20

Best Regards.

=20

Aijun Wang

Network R&D and Operation Support Department

China Telecom Corporation Limited Beijing Research Institute,Beijing, =
China.

=E5=8F=91=E4=BB=B6=E4=BA=BA: Rob Shakir [mailto:rjs@rob.sh]=20
=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2018=E5=B9=B47=E6=9C=8825=E6=97=A5 =
0:22
=E6=94=B6=E4=BB=B6=E4=BA=BA: Aijun Wang
=E6=8A=84=E9=80=81: Dongjie (Jimmy); chopps@chopps.org; Peter Psenak; =
Ketan Talaulikar (ketant); lsr@ietf.org; Acee Lindem (acee)
=E4=B8=BB=E9=A2=98: Re: [Lsr] =E7=AD=94=E5=A4=8D: =E7=AD=94=E5=A4=8D: =
=E7=AD=94=E5=A4=8D: Regarding OSPF extension for inter-area topology =
retrieval

=20

=20

=20

On 23 July 2018 at 23:37, Aijun Wang <wangaijun@tsinghua.org.cn> wrote:

=20

To Rob:=20

=20

BGP-LS is one prominent method to get the underlay network topology and =
has more flexibility to control the topology export as described in RFC =
7752 <https://tools.ietf.org/html/rfc7752#section-1> .=20

=20

Solution 1) that you proposed is possible, but we will not run two =
different methods to get the topology.

=20

What is the other method that you're running alongside an IGP adjacency? =
This is a single method that just uses the IGP protocol that you have =
today.

=20

Solution 2) is also one possible deployment, but it eliminates the =
advantage of the BGP-LS, in which it needs several interaction points =
with the underlay network. and such deployment is not belong to =
redundancy category as information got from different areaes are =
different.

=20

Yes, the information is different but this is why you have areas within =
the IGP. Are you implying that your controller cannot merge topologies =
from different areas? I'd suggest that this is something that is =
relatively trivial to add into that code, rather than changing the code =
running on your routers.

=20

Solution 3)--Streaming telemetry technology should be used mainly for =
the monitor of network devices, it requires the PCE controller to =
contact with every router in the network, is also not the optimal =
solution when compared with BGP-LS.

=20

This is not true. LSDB export via streaming telemetry (for the entire =
LSDB) is possible in today's running code with IS-IS, and models are =
written for OSPF's LSDB. The controller just needs to interact with one =
device per area per the existing discussion.=20

=20

Assertion that this is not the optimal solution seems more like opinion =
to me. Some justification would be useful for us to understand why the =
existing solutions that are shipping aren't suitable. Why should we =
further complicate protocols that ship for everyone if there is no =
technical reason to do so?

=20

 We can update the current draft to include all possible scenarios that =
we are not aiming at beginning for integrity consideration. The proposed =
extension does not add to complexity of IGP. What we discussed here is =
the complexity of IGP protocol itself.

=20

 You're asking for information that is explicitly partitioned (based on =
the fact that your network is partitioned into areas) to be exported =
into an area simply to reduce the number of adjacencies between a =
controller and the network to N (where N is the redundancy of the =
controller) rather than N*areas -- why is this the right trade-off?

=20

r.


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lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>Hi, Rob:<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>If we use BGP-LS to get the underlay topology, we will not consider =
deployment other methods such as IGP adjacency or LSDB telemetry, =
although all of them are applicable.<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>If we deploy BGP-LS adjacency with routers in multi-area to get the =
full multi-area topology, it will be no different with the traditional =
IGP adjacency, increase the complexity that BGP-LS solution itself can =
reduce.<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>On the other hand, if we do not solve such scenario, isn=E2=80=99t =
BGP-LS one complete solution for underlay IGP topology =
gathering?<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal =
style=3D'text-align:justify;text-justify:inter-ideograph'><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>Best Regards.<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'text-align:justify;text-justify:inter-ideograph'><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal =
style=3D'text-align:justify;text-justify:inter-ideograph'><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>Aijun Wang<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'text-align:justify;text-justify:inter-ideograph'><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>Network R&amp;D and Operation Support =
Department<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'text-align:justify;text-justify:inter-ideograph'><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>China Telecom Corporation Limited Beijing Research Institute,Beijing, =
China.<o:p></o:p></span></p><div style=3D'border:none;border-top:solid =
#B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=3DMsoNormal><b><span =
style=3D'font-size:10.0pt'>=E5=8F=91=E4=BB=B6=E4=BA=BA<span =
lang=3DEN-US>:</span></span></b><span lang=3DEN-US =
style=3D'font-size:10.0pt'> Rob Shakir [mailto:rjs@rob.sh] =
<br></span><b><span =
style=3D'font-size:10.0pt'>=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4<span =
lang=3DEN-US>:</span></span></b><span lang=3DEN-US =
style=3D'font-size:10.0pt'> 2018</span><span =
style=3D'font-size:10.0pt'>=E5=B9=B4<span =
lang=3DEN-US>7</span>=E6=9C=88<span lang=3DEN-US>25</span>=E6=97=A5<span =
lang=3DEN-US> 0:22<br></span><b>=E6=94=B6=E4=BB=B6=E4=BA=BA<span =
lang=3DEN-US>:</span></b><span lang=3DEN-US> Aijun =
Wang<br></span><b>=E6=8A=84=E9=80=81<span lang=3DEN-US>:</span></b><span =
lang=3DEN-US> Dongjie (Jimmy); chopps@chopps.org; Peter Psenak; Ketan =
Talaulikar (ketant); lsr@ietf.org; Acee Lindem =
(acee)<br></span><b>=E4=B8=BB=E9=A2=98<span =
lang=3DEN-US>:</span></b><span lang=3DEN-US> Re: [Lsr] =
</span>=E7=AD=94=E5=A4=8D<span lang=3DEN-US>: =
</span>=E7=AD=94=E5=A4=8D<span lang=3DEN-US>: =
</span>=E7=AD=94=E5=A4=8D<span lang=3DEN-US>: Regarding OSPF extension =
for inter-area topology retrieval<o:p></o:p></span></span></p></div><p =
class=3DMsoNormal><span lang=3DEN-US><o:p>&nbsp;</o:p></span></p><div><p =
class=3DMsoNormal><span lang=3DEN-US><o:p>&nbsp;</o:p></span></p><div><p =
class=3DMsoNormal><span lang=3DEN-US><o:p>&nbsp;</o:p></span></p><div><p =
class=3DMsoNormal><span lang=3DEN-US>On 23 July 2018 at 23:37, Aijun =
Wang &lt;<a href=3D"mailto:wangaijun@tsinghua.org.cn" =
target=3D"_blank">wangaijun@tsinghua.org.cn</a>&gt; =
wrote:<o:p></o:p></span></p><div><div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
lang=3DEN-US style=3D'font-size:10.0pt;color:black'>&nbsp;</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><u><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>To Rob: </span></u><span lang=3DEN-US><o:p></o:p></span></p><p =
class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
lang=3DEN-US style=3D'font-size:10.0pt;color:black'>&nbsp;</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
lang=3DEN-US style=3D'font-size:10.0pt;color:black'>BGP-LS is one =
prominent method to get the underlay network topology and has more =
flexibility to control the topology export as described in <a =
href=3D"https://tools.ietf.org/html/rfc7752#section-1" =
target=3D"_blank">RFC 7752</a>. </span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
lang=3DEN-US style=3D'font-size:10.0pt;color:black'>&nbsp;</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
lang=3DEN-US style=3D'font-size:10.0pt;color:black'>Solution 1) that you =
proposed is possible, but we will not run two different methods to get =
the topology.</span><span =
lang=3DEN-US><o:p></o:p></span></p></div></div><div><p =
class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p></div><div><p =
class=3DMsoNormal><span lang=3DEN-US>What is the other method that =
you're running alongside an IGP adjacency? This is a single method that =
just uses the IGP protocol that you have =
today.<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
lang=3DEN-US>&nbsp;<o:p></o:p></span></p></div><blockquote =
style=3D'border:none;border-left:solid #CCCCCC 1.0pt;padding:0cm 0cm 0cm =
6.0pt;margin-left:4.8pt;margin-right:0cm'><div><div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
lang=3DEN-US style=3D'font-size:10.0pt;color:black'>Solution 2) is also =
one possible deployment, but it eliminates the advantage of the BGP-LS, =
in which it needs several interaction points with the underlay network. =
and such deployment is not belong to redundancy category as information =
got from different areaes are different.</span><span =
lang=3DEN-US><o:p></o:p></span></p></div></div></blockquote><div><p =
class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p></div><div><p =
class=3DMsoNormal><span lang=3DEN-US>Yes, the information is different =
but this is why you have areas within the IGP. Are you implying that =
your controller cannot merge topologies from different areas? I'd =
suggest that this is something that is relatively trivial to add into =
that code, rather than changing the code running on your =
routers.<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
lang=3DEN-US>&nbsp;<o:p></o:p></span></p></div><blockquote =
style=3D'border:none;border-left:solid #CCCCCC 1.0pt;padding:0cm 0cm 0cm =
6.0pt;margin-left:4.8pt;margin-right:0cm'><div><div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
lang=3DEN-US style=3D'font-size:10.0pt;color:black'>Solution =
3)--Streaming telemetry technology should be used mainly for the monitor =
of network devices, it requires the PCE controller to contact with every =
router in the network, is also not the optimal solution when compared =
with BGP-LS.</span><span =
lang=3DEN-US><o:p></o:p></span></p></div></div></blockquote><div><p =
class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p></div><div><p =
class=3DMsoNormal><span lang=3DEN-US>This is not true. LSDB export via =
streaming telemetry (for the entire LSDB) is possible in today's running =
code with IS-IS, and models are written for OSPF's LSDB. The controller =
just needs to interact with one device per area per the existing =
discussion.&nbsp;<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p></div><div><p =
class=3DMsoNormal><span lang=3DEN-US>Assertion that this is not the =
optimal solution seems more like opinion to me. Some justification would =
be useful for us to understand why the existing solutions that are =
shipping aren't suitable. Why should we further complicate protocols =
that ship for everyone if there is no technical reason to do =
so?<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
lang=3DEN-US>&nbsp;<o:p></o:p></span></p></div><blockquote =
style=3D'border:none;border-left:solid #CCCCCC 1.0pt;padding:0cm 0cm 0cm =
6.0pt;margin-left:4.8pt;margin-right:0cm'><div><div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
lang=3DEN-US style=3D'font-size:10.0pt;color:black'>&nbsp;We can update =
the current draft to include all possible scenarios that we are not =
aiming at beginning for integrity consideration. The proposed extension =
does not add to complexity of IGP. What we discussed here is the =
complexity of IGP protocol itself.</span><span =
lang=3DEN-US><o:p></o:p></span></p></div></div></blockquote><div><p =
class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p></div><div><p =
class=3DMsoNormal><span lang=3DEN-US style=3D'color:black'>&nbsp;You're =
asking for information that is explicitly partitioned (based on the fact =
that your network is partitioned into areas) to be exported into an area =
simply to reduce the number of adjacencies between a controller and the =
network to N (where N is the redundancy of the controller) rather than =
N*areas -- why is this the right trade-off?</span><span =
lang=3DEN-US><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p></div><div><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:black'>r.</span><span =
lang=3DEN-US><o:p></o:p></span></p></div></div></div></div></div></body><=
/html>
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From: Yingzhen Qu <yingzhen.qu@huawei.com>
To: "draft-ietf-ospf-lls-interface-id@ietf.org" <draft-ietf-ospf-lls-interface-id@ietf.org>, "Peter Psenak (ppsenak)" <ppsenak@cisco.com>
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From: Tony Przygienda <tonysietf@gmail.com>
Date: Wed, 25 Jul 2018 08:08:28 +0200
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To: Rob Shakir <rjs@rob.sh>
Cc: ppsenak=40cisco.com@dmarc.ietf.org,  "Dongjie (Jimmy)" <jie.dong@huawei.com>, Christian Hopps <chopps@chopps.org>,  ketant@cisco.com, wangaijun@tsinghua.org.cn, lsr@ietf.org,  "Acee Lindem (acee)" <acee@cisco.com>
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pretty obvious +1 here

--- tony

On Tue, Jul 24, 2018 at 3:41 AM Rob Shakir <rjs@rob.sh> wrote:

> +1 to Peter. We should not define fragile solutions within the IETF.
>
> There are also a multitude of other solutions here already:
>
> 1) IGP adjacency with one router in each area (at a minimum - probably tw=
o
> for a robust system) over a tunnel. Deployed in many networks for years.
> 2) BGP-LS to one router (ditto robustness comment) in each area.
> 3) streaming telemetry of the LSDB contents via gNMI.
>
> All these solutions exist in shipping implementations - please let=E2=80=
=99s not
> add to the system complexity of the IGP here.
>
> r.
> On Mon, Jul 23, 2018 at 12:30 Peter Psenak <ppsenak=3D
> 40cisco.com@dmarc.ietf.org> wrote:
>
>> Hi Aijun,
>>
>> On 23/07/18 13:07 , Aijun Wang wrote:
>> > Hi, Peter:
>> >
>> > For routers that connected by LAN, the router will establish adjacent
>> > neighbor with DR, but not only DR advertises the connected prefixes.
>>
>> only the Network LSA includes the network mask, other routers would
>> include the interface address only.
>>
>>
>> > DR and
>> > DRother will all advertise type 1 and type 2 LSA with each other, then
>> the
>> > process and proposal described in this draft will still work.
>> > We seldom use the ip unnumbered features in our network, can we ignore
>> it
>> > then? Or other persons has some idea on such situation?
>>
>> the fact that you do not use unnumbered is not really relevant. IETF
>> defines solutions that MUST work for all possible scenarios, not only
>> for a specific one.
>>
>> > Anycast prefixes are often /32 long, this can be easily filtered by SD=
N
>> > controller because the link prefixes between two routers will be no
>> larger
>> > than /32 for IPv4 network.
>>
>> protocol allows to advertise the same prefix with an arbitrary mask from
>> multiple routers without these routers being directly connected. Your
>> proposal is based on the assumptions that are incorrect.
>>
>> thanks,
>> Peter
>>
>> >
>> > Best Regards.
>> >
>> > Aijun Wang
>> > Network R&D and Operation Support Department
>> > China Telecom Corporation Limited Beijing Research Institute,Beijing,
>> China.
>> >
>> > -----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6-----
>> > =E5=8F=91=E4=BB=B6=E4=BA=BA: Peter Psenak [mailto:ppsenak=3D40cisco.co=
m@dmarc.ietf.org]
>> > =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2018=E5=B9=B47=E6=9C=8823=E6=97=
=A5 18:20
>> > =E6=94=B6=E4=BB=B6=E4=BA=BA: Aijun Wang; 'Peter Psenak'; chopps@chopps=
.org
>> > =E6=8A=84=E9=80=81: lsr@ietf.org; 'Ketan Talaulikar (ketant)'; 'Acee L=
indem (acee)';
>> > 'Dongjie (Jimmy)'
>> > =E4=B8=BB=E9=A2=98: Re: [Lsr] =E7=AD=94=E5=A4=8D: Regarding OSPF exten=
sion for inter-area topology
>> > retrieval
>> >
>> > Hi Aijun,
>> >
>> > On 23/07/18 11:16 , Aijun Wang wrote:
>> >> Hi, Peter:
>> >>
>> >> Actually, I consider mainly the point-to-point connection and the
>> >> numbered interface, which are normal in our network.
>> >> For the two situations that you mentioned, I will investigation the
>> >> possible solutions and feedback you later.
>> >>
>> >> For the point-to-point and numbered interface, do you have other
>> >> questions then?
>> >
>> > the fact that two routers announce the same subnet, does not mean they
>> are
>> > connected together by p2p link. Anycast prefix is an example.
>> >
>> > The idea you are proposing simply does not work.
>> >
>> > thanks,
>> > Peter
>> >
>> >
>> >>
>> >> Best Regards.
>> >>
>> >> Aijun Wang
>> >> Network R&D and Operation Support Department China Telecom Corporatio=
n
>> >> Limited Beijing Research Institute,Beijing, China.
>> >>
>> >> -----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6-----
>> >> =E5=8F=91=E4=BB=B6=E4=BA=BA: Peter Psenak [mailto:ppsenak=3D40cisco.c=
om@dmarc.ietf.org]
>> >> =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2018=E5=B9=B47=E6=9C=8823=E6=97=
=A5 16:15
>> >> =E6=94=B6=E4=BB=B6=E4=BA=BA: Aijun Wang; chopps@chopps.org
>> >> =E6=8A=84=E9=80=81: lsr@ietf.org; 'Ketan Talaulikar (ketant)'; 'Acee =
Lindem (acee)';
>> >> 'Dongjie (Jimmy)'
>> >> =E4=B8=BB=E9=A2=98: Re: [Lsr] Regarding OSPF extension for inter-area=
 topology
>> >> retrieval
>> >>
>> >> Hi Aijun,
>> >>
>> >> you are trying to reconstruct the topology of the remote area based o=
n
>> >> the fact that two routers are connected to the same subnet. It does
>> >> not work
>> >> because:
>> >>
>> >> 1. connections between routers can be unnumbered 2. routers can be
>> >> connected via LAN, in which case only DR announces the prefix.
>> >>
>> >> In summary, what you propose does not work.
>> >>
>> >> thanks,
>> >> Peter
>> >>
>> >>
>> >>
>> >> On 23/07/18 09:49 , Aijun Wang wrote:
>> >>> (Sorry for my previous mail sent wrongly to the IDR mail list, pleas=
e
>> >>> reply on this thread within the LSR wg)
>> >>>
>> >>> Hi, Peter:
>> >>>
>> >>> I am Aijun Wang from China Telecom, the author of draft about =E2=80=
=9COSPF
>> >>> extension for inter-area topology retrieval=E2=80=9D
>> >>> <https://datatracker.ietf.org/doc/draft-wang-lsr-ospf-inter-area-top=
o
>> >>> l ogy-ext/>, which is presented by Mr.Jie Dong during the IETF102
>> >>> meeting.
>> >>>
>> >>> Thanks for your comments on the presentation material
>> >>>
>> >> <https://datatracker.ietf.org/meeting/102/materials/slides-102-lsr-os=
p
>> >> f-inte
>> >> r-area-topology-retrieval-00>.
>> >>>
>> >>> Below are my explanation that regarding to the question about =E2=80=
=9Chow it
>> >>> retrievals the inter-area topology based on the extension
>> information=E2=80=9D:
>> >>>
>> >>> Let=E2=80=99s see the graph that illustrates in Fig.1 at section 3
>> >>> <https://tools.ietf.org/html/draft-wang-lsr-ospf-inter-area-topology=
-
>> >>> e xt-00#section-3> of the draft(I copy it also below for your
>> >>> conveniences ):
>> >>>
>> >>> Assuming we want to rebuild the connection between router S1 and
>> >>> router
>> >>> S2 that locates in area 1:
>> >>>
>> >>> 1)Normally, router S1 will advertise prefix N1 within its router LSA
>> >>>
>> >>> 2)When this router LSA reaches the ABR router R1, it will convert it
>> >>> into summary LSA, add the =E2=80=9CSource Router Information=E2=80=
=9D, which is
>> >>> router id of S1 in this example, as proposed in this draft.
>> >>>
>> >>> 3)R1 then floods this extension summary LSA to R0, which is running
>> >>> BGP-LS protocol with IP SDN Controller. The controller then knows th=
e
>> >>> prefixes of N1 is from S1.
>> >>>
>> >>> 4)Router S2 will do the similar process, and the controller will als=
o
>> >>> knows the prefixes N1 is also from S2
>> >>>
>> >>> 5)Then it can reconstruct the connection between S1 and S2, which
>> >>> prefix is N1. The topology within Area 1 can then be recovered
>> >> accordingly.
>> >>>
>> >>> Does the above explanation can answer your question. if so, I can ad=
d
>> >>> it into the context of this draft in updated version.
>> >>>
>> >>> Best Regards.
>> >>>
>> >>> Aijun Wang
>> >>>
>> >>> Network R&D and Operation Support Department
>> >>>
>> >>> China Telecom Corporation Limited Beijing Research Institute,Beijing=
,
>> >> China.
>> >>>
>> >>
>> >> _______________________________________________
>> >> 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
>> >
>> > .
>> >
>>
>> _______________________________________________
>> 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
>

--000000000000417b780571ccb717
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div>pretty obvious +1 here <br><br></div>--- tony <br></d=
iv><br><div class=3D"gmail_quote"><div dir=3D"ltr">On Tue, Jul 24, 2018 at =
3:41 AM Rob Shakir &lt;rjs@rob.sh&gt; wrote:<br></div><blockquote class=3D"=
gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-=
left:1ex">+1 to Peter. We should not define fragile solutions within the IE=
TF.<br><br>There are also a multitude of other solutions here already:<br><=
br>1) IGP adjacency with one router in each area (at a minimum - probably t=
wo for a robust system) over a tunnel. Deployed in many networks for years.=
 <br>2) BGP-LS to one router (ditto robustness comment) in each area. <br>3=
) streaming telemetry of the LSDB contents via gNMI.<br><br>All these solut=
ions exist in shipping implementations - please let=E2=80=99s not add to th=
e system complexity of the IGP here.<br><br>r. <br><div class=3D"gmail_quot=
e"><div dir=3D"ltr">On Mon, Jul 23, 2018 at 12:30 Peter Psenak &lt;ppsenak=
=3D<a href=3D"mailto:40cisco.com@dmarc.ietf.org" target=3D"_blank">40cisco.=
com@dmarc.ietf.org</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote=
" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">H=
i Aijun,<br>
<br>
On 23/07/18 13:07 , Aijun Wang wrote:<br>
&gt; Hi, Peter:<br>
&gt; <br>
&gt; For routers that connected by LAN, the router will establish adjacent<=
br>
&gt; neighbor with DR, but not only DR advertises the connected prefixes. <=
br>
<br>
only the Network LSA includes the network mask, other routers would<br>
include the interface address only.<br>
<br>
<br>
&gt; DR and<br>
&gt; DRother will all advertise type 1 and type 2 LSA with each other, then=
 the<br>
&gt; process and proposal described in this draft will still work.<br>
&gt; We seldom use the ip unnumbered features in our network, can we ignore=
 it<br>
&gt; then? Or other persons has some idea on such situation?<br>
<br>
the fact that you do not use unnumbered is not really relevant. IETF<br>
defines solutions that MUST work for all possible scenarios, not only<br>
for a specific one.<br>
<br>
&gt; Anycast prefixes are often /32 long, this can be easily filtered by SD=
N<br>
&gt; controller because the link prefixes between two routers will be no la=
rger<br>
&gt; than /32 for IPv4 network.<br>
<br>
protocol allows to advertise the same prefix with an arbitrary mask from<br=
>
multiple routers without these routers being directly connected. Your<br>
proposal is based on the assumptions that are incorrect.<br>
<br>
thanks,<br>
Peter<br>
<br>
&gt; <br>
&gt; Best Regards.<br>
&gt; <br>
&gt; Aijun Wang<br>
&gt; Network R&amp;D and Operation Support Department<br>
&gt; China Telecom Corporation Limited Beijing Research Institute,Beijing, =
China.<br>
&gt; <br>
&gt; -----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6-----<br>
&gt; =E5=8F=91=E4=BB=B6=E4=BA=BA: Peter Psenak [mailto:<a href=3D"mailto:pp=
senak" target=3D"_blank">ppsenak</a>=3D<a href=3D"mailto:40cisco.com@dmarc.=
ietf.org" target=3D"_blank">40cisco.com@dmarc.ietf.org</a>]<br>
&gt; =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2018=E5=B9=B47=E6=9C=8823=E6=97=
=A5 18:20<br>
&gt; =E6=94=B6=E4=BB=B6=E4=BA=BA: Aijun Wang; &#39;Peter Psenak&#39;; <a hr=
ef=3D"mailto:chopps@chopps.org" target=3D"_blank">chopps@chopps.org</a><br>
&gt; =E6=8A=84=E9=80=81: <a href=3D"mailto:lsr@ietf.org" target=3D"_blank">=
lsr@ietf.org</a>; &#39;Ketan Talaulikar (ketant)&#39;; &#39;Acee Lindem (ac=
ee)&#39;;<br>
&gt; &#39;Dongjie (Jimmy)&#39;<br>
&gt; =E4=B8=BB=E9=A2=98: Re: [Lsr] =E7=AD=94=E5=A4=8D: Regarding OSPF exten=
sion for inter-area topology<br>
&gt; retrieval<br>
&gt; <br>
&gt; Hi Aijun,<br>
&gt; <br>
&gt; On 23/07/18 11:16 , Aijun Wang wrote:<br>
&gt;&gt; Hi, Peter:<br>
&gt;&gt;<br>
&gt;&gt; Actually, I consider mainly the point-to-point connection and the<=
br>
&gt;&gt; numbered interface, which are normal in our network.<br>
&gt;&gt; For the two situations that you mentioned, I will investigation th=
e<br>
&gt;&gt; possible solutions and feedback you later.<br>
&gt;&gt;<br>
&gt;&gt; For the point-to-point and numbered interface, do you have other<b=
r>
&gt;&gt; questions then?<br>
&gt; <br>
&gt; the fact that two routers announce the same subnet, does not mean they=
 are<br>
&gt; connected together by p2p link. Anycast prefix is an example.<br>
&gt; <br>
&gt; The idea you are proposing simply does not work.<br>
&gt; <br>
&gt; thanks,<br>
&gt; Peter<br>
&gt; <br>
&gt; <br>
&gt;&gt;<br>
&gt;&gt; Best Regards.<br>
&gt;&gt;<br>
&gt;&gt; Aijun Wang<br>
&gt;&gt; Network R&amp;D and Operation Support Department China Telecom Cor=
poration<br>
&gt;&gt; Limited Beijing Research Institute,Beijing, China.<br>
&gt;&gt;<br>
&gt;&gt; -----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6-----<br>
&gt;&gt; =E5=8F=91=E4=BB=B6=E4=BA=BA: Peter Psenak [mailto:<a href=3D"mailt=
o:ppsenak" target=3D"_blank">ppsenak</a>=3D<a href=3D"mailto:40cisco.com@dm=
arc.ietf.org" target=3D"_blank">40cisco.com@dmarc.ietf.org</a>]<br>
&gt;&gt; =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2018=E5=B9=B47=E6=9C=8823=E6=
=97=A5 16:15<br>
&gt;&gt; =E6=94=B6=E4=BB=B6=E4=BA=BA: Aijun Wang; <a href=3D"mailto:chopps@=
chopps.org" target=3D"_blank">chopps@chopps.org</a><br>
&gt;&gt; =E6=8A=84=E9=80=81: <a href=3D"mailto:lsr@ietf.org" target=3D"_bla=
nk">lsr@ietf.org</a>; &#39;Ketan Talaulikar (ketant)&#39;; &#39;Acee Lindem=
 (acee)&#39;;<br>
&gt;&gt; &#39;Dongjie (Jimmy)&#39;<br>
&gt;&gt; =E4=B8=BB=E9=A2=98: Re: [Lsr] Regarding OSPF extension for inter-a=
rea topology<br>
&gt;&gt; retrieval<br>
&gt;&gt;<br>
&gt;&gt; Hi Aijun,<br>
&gt;&gt;<br>
&gt;&gt; you are trying to reconstruct the topology of the remote area base=
d on<br>
&gt;&gt; the fact that two routers are connected to the same subnet. It doe=
s<br>
&gt;&gt; not work<br>
&gt;&gt; because:<br>
&gt;&gt;<br>
&gt;&gt; 1. connections between routers can be unnumbered 2. routers can be=
<br>
&gt;&gt; connected via LAN, in which case only DR announces the prefix.<br>
&gt;&gt;<br>
&gt;&gt; In summary, what you propose does not work.<br>
&gt;&gt;<br>
&gt;&gt; thanks,<br>
&gt;&gt; Peter<br>
&gt;&gt;<br>
&gt;&gt;<br>
&gt;&gt;<br>
&gt;&gt; On 23/07/18 09:49 , Aijun Wang wrote:<br>
&gt;&gt;&gt; (Sorry for my previous mail sent wrongly to the IDR mail list,=
 please<br>
&gt;&gt;&gt; reply on this thread within the LSR wg)<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; Hi, Peter:<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; I am Aijun Wang from China Telecom, the author of draft about =
=E2=80=9COSPF<br>
&gt;&gt;&gt; extension for inter-area topology retrieval=E2=80=9D<br>
&gt;&gt;&gt; &lt;<a href=3D"https://datatracker.ietf.org/doc/draft-wang-lsr=
-ospf-inter-area-topo" rel=3D"noreferrer" target=3D"_blank">https://datatra=
cker.ietf.org/doc/draft-wang-lsr-ospf-inter-area-topo</a><br>
&gt;&gt;&gt; l ogy-ext/&gt;, which is presented by Mr.Jie Dong during the I=
ETF102<br>
&gt;&gt;&gt; meeting.<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; Thanks for your comments on the presentation material<br>
&gt;&gt;&gt;<br>
&gt;&gt; &lt;<a href=3D"https://datatracker.ietf.org/meeting/102/materials/=
slides-102-lsr-osp" rel=3D"noreferrer" target=3D"_blank">https://datatracke=
r.ietf.org/meeting/102/materials/slides-102-lsr-osp</a><br>
&gt;&gt; f-inte<br>
&gt;&gt; r-area-topology-retrieval-00&gt;.<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; Below are my explanation that regarding to the question about =
=E2=80=9Chow it<br>
&gt;&gt;&gt; retrievals the inter-area topology based on the extension info=
rmation=E2=80=9D:<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; Let=E2=80=99s see the graph that illustrates in Fig.1 at secti=
on 3<br>
&gt;&gt;&gt; &lt;<a href=3D"https://tools.ietf.org/html/draft-wang-lsr-ospf=
-inter-area-topology-" rel=3D"noreferrer" target=3D"_blank">https://tools.i=
etf.org/html/draft-wang-lsr-ospf-inter-area-topology-</a><br>
&gt;&gt;&gt; e xt-00#section-3&gt; of the draft(I copy it also below for yo=
ur<br>
&gt;&gt;&gt; conveniences ):<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; Assuming we want to rebuild the connection between router S1 a=
nd<br>
&gt;&gt;&gt; router<br>
&gt;&gt;&gt; S2 that locates in area 1:<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; 1)Normally, router S1 will advertise prefix N1 within its rout=
er LSA<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; 2)When this router LSA reaches the ABR router R1, it will conv=
ert it<br>
&gt;&gt;&gt; into summary LSA, add the =E2=80=9CSource Router Information=
=E2=80=9D, which is<br>
&gt;&gt;&gt; router id of S1 in this example, as proposed in this draft.<br=
>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; 3)R1 then floods this extension summary LSA to R0, which is ru=
nning<br>
&gt;&gt;&gt; BGP-LS protocol with IP SDN Controller. The controller then kn=
ows the<br>
&gt;&gt;&gt; prefixes of N1 is from S1.<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; 4)Router S2 will do the similar process, and the controller wi=
ll also<br>
&gt;&gt;&gt; knows the prefixes N1 is also from S2<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; 5)Then it can reconstruct the connection between S1 and S2, wh=
ich<br>
&gt;&gt;&gt; prefix is N1. The topology within Area 1 can then be recovered=
<br>
&gt;&gt; accordingly.<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; Does the above explanation can answer your question. if so, I =
can add<br>
&gt;&gt;&gt; it into the context of this draft in updated version.<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; Best Regards.<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; Aijun Wang<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; Network R&amp;D and Operation Support Department<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; China Telecom Corporation Limited Beijing Research Institute,B=
eijing,<br>
&gt;&gt; China.<br>
&gt;&gt;&gt;<br>
&gt;&gt;<br>
&gt;&gt; _______________________________________________<br>
&gt;&gt; Lsr mailing list<br>
&gt;&gt; <a href=3D"mailto:Lsr@ietf.org" target=3D"_blank">Lsr@ietf.org</a>=
<br>
&gt;&gt; <a href=3D"https://www.ietf.org/mailman/listinfo/lsr" rel=3D"noref=
errer" target=3D"_blank">https://www.ietf.org/mailman/listinfo/lsr</a><br>
&gt;&gt;<br>
&gt;&gt; _______________________________________________<br>
&gt;&gt; Lsr mailing list<br>
&gt;&gt; <a href=3D"mailto:Lsr@ietf.org" target=3D"_blank">Lsr@ietf.org</a>=
<br>
&gt;&gt; <a href=3D"https://www.ietf.org/mailman/listinfo/lsr" rel=3D"noref=
errer" target=3D"_blank">https://www.ietf.org/mailman/listinfo/lsr</a><br>
&gt;&gt;<br>
&gt; <br>
&gt; _______________________________________________<br>
&gt; Lsr mailing list<br>
&gt; <a href=3D"mailto:Lsr@ietf.org" target=3D"_blank">Lsr@ietf.org</a><br>
&gt; <a href=3D"https://www.ietf.org/mailman/listinfo/lsr" rel=3D"noreferre=
r" target=3D"_blank">https://www.ietf.org/mailman/listinfo/lsr</a><br>
&gt; <br>
&gt; .<br>
&gt; <br>
<br>
_______________________________________________<br>
Lsr mailing list<br>
<a href=3D"mailto:Lsr@ietf.org" target=3D"_blank">Lsr@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/lsr" rel=3D"noreferrer" ta=
rget=3D"_blank">https://www.ietf.org/mailman/listinfo/lsr</a><br>
</blockquote></div>
_______________________________________________<br>
Lsr mailing list<br>
<a href=3D"mailto:Lsr@ietf.org" target=3D"_blank">Lsr@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/lsr" rel=3D"noreferrer" ta=
rget=3D"_blank">https://www.ietf.org/mailman/listinfo/lsr</a><br>
</blockquote></div>

--000000000000417b780571ccb717--


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From: "Dongjie (Jimmy)" <jie.dong@huawei.com>
To: "Acee Lindem (acee)" <acee@cisco.com>, "Ketan Talaulikar (ketant)" <ketant@cisco.com>, "Peter Psenak (ppsenak)" <ppsenak@cisco.com>, Aijun Wang <wangaijun@tsinghua.org.cn>, 'Rob Shakir' <rjs@rob.sh>
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From: Jeff Tantsura <jefftant.ietf@gmail.com>
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Date: Wed, 25 Jul 2018 00:32:25 -0700
Cc: Rob Shakir <rjs@rob.sh>, "Dongjie (Jimmy)" <jie.dong@huawei.com>, Christian Hopps <chopps@chopps.org>, ppsenak=40cisco.com@dmarc.ietf.org, ketant@cisco.com, wangaijun@tsinghua.org.cn, lsr@ietf.org, "Acee Lindem (acee)" <acee@cisco.com>
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References: <001601d42259$a860fff0$f922ffd0$@org.cn> <5B558E76.3010703@cisco.com> <003201d42265$cd011af0$670350d0$@org.cn> <5B55ABB5.60806@cisco.com> <003f01d42275$5ec00eb0$1c402c10$@org.cn> <5B55BC38.3050605@cisco.com> <CAHxMReYo_e+dDJ611X3eihV0WCToYqFDa2c+CLnfzhF8_L2YDA@mail.gmail.com> <CA+wi2hOs0qeZSOGQXSE+Ok_7YeqxyLnPDmDZ-r1YFsw=AS1haw@mail.gmail.com>
To: Tony Przygienda <tonysietf@gmail.com>
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Subject: Re: [Lsr]  =?utf-8?b?562U5aSNOiDnrZTlpI06IFJlZ2FyZGluZyBPU1BGIGV4dGVu?= =?utf-8?q?sion_for_inter-area_topology_retrieval?=
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Not going to repeat all the comments made before, +1

Regards,
Jeff

> On Jul 24, 2018, at 23:08, Tony Przygienda <tonysietf@gmail.com> wrote:
>=20
> pretty obvious +1 here=20
>=20
> --- tony=20
>=20
>> On Tue, Jul 24, 2018 at 3:41 AM Rob Shakir <rjs@rob.sh> wrote:
>> +1 to Peter. We should not define fragile solutions within the IETF.
>>=20
>> There are also a multitude of other solutions here already:
>>=20
>> 1) IGP adjacency with one router in each area (at a minimum - probably tw=
o for a robust system) over a tunnel. Deployed in many networks for years.=20=

>> 2) BGP-LS to one router (ditto robustness comment) in each area.=20
>> 3) streaming telemetry of the LSDB contents via gNMI.
>>=20
>> All these solutions exist in shipping implementations - please let=E2=80=99=
s not add to the system complexity of the IGP here.
>>=20
>> r.=20
>>> On Mon, Jul 23, 2018 at 12:30 Peter Psenak <ppsenak=3D40cisco.com@dmarc.=
ietf.org> wrote:
>>> Hi Aijun,
>>>=20
>>> On 23/07/18 13:07 , Aijun Wang wrote:
>>> > Hi, Peter:
>>> >=20
>>> > For routers that connected by LAN, the router will establish adjacent
>>> > neighbor with DR, but not only DR advertises the connected prefixes.=20=

>>>=20
>>> only the Network LSA includes the network mask, other routers would
>>> include the interface address only.
>>>=20
>>>=20
>>> > DR and
>>> > DRother will all advertise type 1 and type 2 LSA with each other, then=
 the
>>> > process and proposal described in this draft will still work.
>>> > We seldom use the ip unnumbered features in our network, can we ignore=
 it
>>> > then? Or other persons has some idea on such situation?
>>>=20
>>> the fact that you do not use unnumbered is not really relevant. IETF
>>> defines solutions that MUST work for all possible scenarios, not only
>>> for a specific one.
>>>=20
>>> > Anycast prefixes are often /32 long, this can be easily filtered by SD=
N
>>> > controller because the link prefixes between two routers will be no la=
rger
>>> > than /32 for IPv4 network.
>>>=20
>>> protocol allows to advertise the same prefix with an arbitrary mask from=

>>> multiple routers without these routers being directly connected. Your
>>> proposal is based on the assumptions that are incorrect.
>>>=20
>>> thanks,
>>> Peter
>>>=20
>>> >=20
>>> > Best Regards.
>>> >=20
>>> > Aijun Wang
>>> > Network R&D and Operation Support Department
>>> > China Telecom Corporation Limited Beijing Research Institute,Beijing, C=
hina.
>>> >=20
>>> > -----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6-----
>>> > =E5=8F=91=E4=BB=B6=E4=BA=BA: Peter Psenak [mailto:ppsenak=3D40cisco.co=
m@dmarc.ietf.org]
>>> > =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2018=E5=B9=B47=E6=9C=8823=E6=97=A5=
 18:20
>>> > =E6=94=B6=E4=BB=B6=E4=BA=BA: Aijun Wang; 'Peter Psenak'; chopps@chopps=
.org
>>> > =E6=8A=84=E9=80=81: lsr@ietf.org; 'Ketan Talaulikar (ketant)'; 'Acee L=
indem (acee)';
>>> > 'Dongjie (Jimmy)'
>>> > =E4=B8=BB=E9=A2=98: Re: [Lsr] =E7=AD=94=E5=A4=8D: Regarding OSPF exten=
sion for inter-area topology
>>> > retrieval
>>> >=20
>>> > Hi Aijun,
>>> >=20
>>> > On 23/07/18 11:16 , Aijun Wang wrote:
>>> >> Hi, Peter:
>>> >>
>>> >> Actually, I consider mainly the point-to-point connection and the
>>> >> numbered interface, which are normal in our network.
>>> >> For the two situations that you mentioned, I will investigation the
>>> >> possible solutions and feedback you later.
>>> >>
>>> >> For the point-to-point and numbered interface, do you have other
>>> >> questions then?
>>> >=20
>>> > the fact that two routers announce the same subnet, does not mean they=
 are
>>> > connected together by p2p link. Anycast prefix is an example.
>>> >=20
>>> > The idea you are proposing simply does not work.
>>> >=20
>>> > thanks,
>>> > Peter
>>> >=20
>>> >=20
>>> >>
>>> >> Best Regards.
>>> >>
>>> >> Aijun Wang
>>> >> Network R&D and Operation Support Department China Telecom Corporatio=
n
>>> >> Limited Beijing Research Institute,Beijing, China.
>>> >>
>>> >> -----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6-----
>>> >> =E5=8F=91=E4=BB=B6=E4=BA=BA: Peter Psenak [mailto:ppsenak=3D40cisco.c=
om@dmarc.ietf.org]
>>> >> =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2018=E5=B9=B47=E6=9C=8823=E6=97=
=A5 16:15
>>> >> =E6=94=B6=E4=BB=B6=E4=BA=BA: Aijun Wang; chopps@chopps.org
>>> >> =E6=8A=84=E9=80=81: lsr@ietf.org; 'Ketan Talaulikar (ketant)'; 'Acee L=
indem (acee)';
>>> >> 'Dongjie (Jimmy)'
>>> >> =E4=B8=BB=E9=A2=98: Re: [Lsr] Regarding OSPF extension for inter-area=
 topology
>>> >> retrieval
>>> >>
>>> >> Hi Aijun,
>>> >>
>>> >> you are trying to reconstruct the topology of the remote area based o=
n
>>> >> the fact that two routers are connected to the same subnet. It does
>>> >> not work
>>> >> because:
>>> >>
>>> >> 1. connections between routers can be unnumbered 2. routers can be
>>> >> connected via LAN, in which case only DR announces the prefix.
>>> >>
>>> >> In summary, what you propose does not work.
>>> >>
>>> >> thanks,
>>> >> Peter
>>> >>
>>> >>
>>> >>
>>> >> On 23/07/18 09:49 , Aijun Wang wrote:
>>> >>> (Sorry for my previous mail sent wrongly to the IDR mail list, pleas=
e
>>> >>> reply on this thread within the LSR wg)
>>> >>>
>>> >>> Hi, Peter:
>>> >>>
>>> >>> I am Aijun Wang from China Telecom, the author of draft about =E2=80=
=9COSPF
>>> >>> extension for inter-area topology retrieval=E2=80=9D
>>> >>> <https://datatracker.ietf.org/doc/draft-wang-lsr-ospf-inter-area-top=
o
>>> >>> l ogy-ext/>, which is presented by Mr.Jie Dong during the IETF102
>>> >>> meeting.
>>> >>>
>>> >>> Thanks for your comments on the presentation material
>>> >>>
>>> >> <https://datatracker.ietf.org/meeting/102/materials/slides-102-lsr-os=
p
>>> >> f-inte
>>> >> r-area-topology-retrieval-00>.
>>> >>>
>>> >>> Below are my explanation that regarding to the question about =E2=80=
=9Chow it
>>> >>> retrievals the inter-area topology based on the extension informatio=
n=E2=80=9D:
>>> >>>
>>> >>> Let=E2=80=99s see the graph that illustrates in Fig.1 at section 3
>>> >>> <https://tools.ietf.org/html/draft-wang-lsr-ospf-inter-area-topology=
-
>>> >>> e xt-00#section-3> of the draft(I copy it also below for your
>>> >>> conveniences ):
>>> >>>
>>> >>> Assuming we want to rebuild the connection between router S1 and
>>> >>> router
>>> >>> S2 that locates in area 1:
>>> >>>
>>> >>> 1)Normally, router S1 will advertise prefix N1 within its router LSA=

>>> >>>
>>> >>> 2)When this router LSA reaches the ABR router R1, it will convert it=

>>> >>> into summary LSA, add the =E2=80=9CSource Router Information=E2=80=9D=
, which is
>>> >>> router id of S1 in this example, as proposed in this draft.
>>> >>>
>>> >>> 3)R1 then floods this extension summary LSA to R0, which is running
>>> >>> BGP-LS protocol with IP SDN Controller. The controller then knows th=
e
>>> >>> prefixes of N1 is from S1.
>>> >>>
>>> >>> 4)Router S2 will do the similar process, and the controller will als=
o
>>> >>> knows the prefixes N1 is also from S2
>>> >>>
>>> >>> 5)Then it can reconstruct the connection between S1 and S2, which
>>> >>> prefix is N1. The topology within Area 1 can then be recovered
>>> >> accordingly.
>>> >>>
>>> >>> Does the above explanation can answer your question. if so, I can ad=
d
>>> >>> it into the context of this draft in updated version.
>>> >>>
>>> >>> Best Regards.
>>> >>>
>>> >>> Aijun Wang
>>> >>>
>>> >>> Network R&D and Operation Support Department
>>> >>>
>>> >>> China Telecom Corporation Limited Beijing Research Institute,Beijing=
,
>>> >> China.
>>> >>>
>>> >>
>>> >> _______________________________________________
>>> >> 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
>>> > _______________________________________________
>>> > Lsr mailing list
>>> > Lsr@ietf.org
>>> > https://www.ietf.org/mailman/listinfo/lsr
>>> >=20
>>> > .
>>> >=20
>>>=20
>>> _______________________________________________
>>> 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

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	charset=utf-8
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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"></head><body dir=3D"auto">Not going to repeat all the comments made b=
efore, +1<br><br><div id=3D"AppleMailSignature">Regards,<div>Jeff</div></div=
><div><br>On Jul 24, 2018, at 23:08, Tony Przygienda &lt;<a href=3D"mailto:t=
onysietf@gmail.com">tonysietf@gmail.com</a>&gt; wrote:<br><br></div><blockqu=
ote type=3D"cite"><div><div dir=3D"ltr"><div>pretty obvious +1 here <br><br>=
</div>--- tony <br></div><br><div class=3D"gmail_quote"><div dir=3D"ltr">On T=
ue, Jul 24, 2018 at 3:41 AM Rob Shakir &lt;<a href=3D"mailto:rjs@rob.sh">rjs=
@rob.sh</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"m=
argin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">+1 to Peter. W=
e should not define fragile solutions within the IETF.<br><br>There are also=
 a multitude of other solutions here already:<br><br>1) IGP adjacency with o=
ne router in each area (at a minimum - probably two for a robust system) ove=
r a tunnel. Deployed in many networks for years. <br>2) BGP-LS to one router=
 (ditto robustness comment) in each area. <br>3) streaming telemetry of the L=
SDB contents via gNMI.<br><br>All these solutions exist in shipping implemen=
tations - please let=E2=80=99s not add to the system complexity of the IGP h=
ere.<br><br>r. <br><div class=3D"gmail_quote"><div dir=3D"ltr">On Mon, Jul 2=
3, 2018 at 12:30 Peter Psenak &lt;ppsenak=3D<a href=3D"mailto:40cisco.com@dm=
arc.ietf.org" target=3D"_blank">40cisco.com@dmarc.ietf.org</a>&gt; wrote:<br=
></div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-l=
eft:1px #ccc solid;padding-left:1ex">Hi Aijun,<br>
<br>
On 23/07/18 13:07 , Aijun Wang wrote:<br>
&gt; Hi, Peter:<br>
&gt; <br>
&gt; For routers that connected by LAN, the router will establish adjacent<b=
r>
&gt; neighbor with DR, but not only DR advertises the connected prefixes. <b=
r>
<br>
only the Network LSA includes the network mask, other routers would<br>
include the interface address only.<br>
<br>
<br>
&gt; DR and<br>
&gt; DRother will all advertise type 1 and type 2 LSA with each other, then t=
he<br>
&gt; process and proposal described in this draft will still work.<br>
&gt; We seldom use the ip unnumbered features in our network, can we ignore i=
t<br>
&gt; then? Or other persons has some idea on such situation?<br>
<br>
the fact that you do not use unnumbered is not really relevant. IETF<br>
defines solutions that MUST work for all possible scenarios, not only<br>
for a specific one.<br>
<br>
&gt; Anycast prefixes are often /32 long, this can be easily filtered by SDN=
<br>
&gt; controller because the link prefixes between two routers will be no lar=
ger<br>
&gt; than /32 for IPv4 network.<br>
<br>
protocol allows to advertise the same prefix with an arbitrary mask from<br>=

multiple routers without these routers being directly connected. Your<br>
proposal is based on the assumptions that are incorrect.<br>
<br>
thanks,<br>
Peter<br>
<br>
&gt; <br>
&gt; Best Regards.<br>
&gt; <br>
&gt; Aijun Wang<br>
&gt; Network R&amp;D and Operation Support Department<br>
&gt; China Telecom Corporation Limited Beijing Research Institute,Beijing, C=
hina.<br>
&gt; <br>
&gt; -----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6-----<br>
&gt; =E5=8F=91=E4=BB=B6=E4=BA=BA: Peter Psenak [mailto:<a href=3D"mailto:pps=
enak" target=3D"_blank">ppsenak</a>=3D<a href=3D"mailto:40cisco.com@dmarc.ie=
tf.org" target=3D"_blank">40cisco.com@dmarc.ietf.org</a>]<br>
&gt; =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2018=E5=B9=B47=E6=9C=8823=E6=97=A5=
 18:20<br>
&gt; =E6=94=B6=E4=BB=B6=E4=BA=BA: Aijun Wang; 'Peter Psenak'; <a href=3D"mai=
lto:chopps@chopps.org" target=3D"_blank">chopps@chopps.org</a><br>
&gt; =E6=8A=84=E9=80=81: <a href=3D"mailto:lsr@ietf.org" target=3D"_blank">l=
sr@ietf.org</a>; 'Ketan Talaulikar (ketant)'; 'Acee Lindem (acee)';<br>
&gt; 'Dongjie (Jimmy)'<br>
&gt; =E4=B8=BB=E9=A2=98: Re: [Lsr] =E7=AD=94=E5=A4=8D: Regarding OSPF extens=
ion for inter-area topology<br>
&gt; retrieval<br>
&gt; <br>
&gt; Hi Aijun,<br>
&gt; <br>
&gt; On 23/07/18 11:16 , Aijun Wang wrote:<br>
&gt;&gt; Hi, Peter:<br>
&gt;&gt;<br>
&gt;&gt; Actually, I consider mainly the point-to-point connection and the<b=
r>
&gt;&gt; numbered interface, which are normal in our network.<br>
&gt;&gt; For the two situations that you mentioned, I will investigation the=
<br>
&gt;&gt; possible solutions and feedback you later.<br>
&gt;&gt;<br>
&gt;&gt; For the point-to-point and numbered interface, do you have other<br=
>
&gt;&gt; questions then?<br>
&gt; <br>
&gt; the fact that two routers announce the same subnet, does not mean they a=
re<br>
&gt; connected together by p2p link. Anycast prefix is an example.<br>
&gt; <br>
&gt; The idea you are proposing simply does not work.<br>
&gt; <br>
&gt; thanks,<br>
&gt; Peter<br>
&gt; <br>
&gt; <br>
&gt;&gt;<br>
&gt;&gt; Best Regards.<br>
&gt;&gt;<br>
&gt;&gt; Aijun Wang<br>
&gt;&gt; Network R&amp;D and Operation Support Department China Telecom Corp=
oration<br>
&gt;&gt; Limited Beijing Research Institute,Beijing, China.<br>
&gt;&gt;<br>
&gt;&gt; -----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6-----<br>
&gt;&gt; =E5=8F=91=E4=BB=B6=E4=BA=BA: Peter Psenak [mailto:<a href=3D"mailto=
:ppsenak" target=3D"_blank">ppsenak</a>=3D<a href=3D"mailto:40cisco.com@dmar=
c.ietf.org" target=3D"_blank">40cisco.com@dmarc.ietf.org</a>]<br>
&gt;&gt; =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2018=E5=B9=B47=E6=9C=8823=E6=97=
=A5 16:15<br>
&gt;&gt; =E6=94=B6=E4=BB=B6=E4=BA=BA: Aijun Wang; <a href=3D"mailto:chopps@c=
hopps.org" target=3D"_blank">chopps@chopps.org</a><br>
&gt;&gt; =E6=8A=84=E9=80=81: <a href=3D"mailto:lsr@ietf.org" target=3D"_blan=
k">lsr@ietf.org</a>; 'Ketan Talaulikar (ketant)'; 'Acee Lindem (acee)';<br>
&gt;&gt; 'Dongjie (Jimmy)'<br>
&gt;&gt; =E4=B8=BB=E9=A2=98: Re: [Lsr] Regarding OSPF extension for inter-ar=
ea topology<br>
&gt;&gt; retrieval<br>
&gt;&gt;<br>
&gt;&gt; Hi Aijun,<br>
&gt;&gt;<br>
&gt;&gt; you are trying to reconstruct the topology of the remote area based=
 on<br>
&gt;&gt; the fact that two routers are connected to the same subnet. It does=
<br>
&gt;&gt; not work<br>
&gt;&gt; because:<br>
&gt;&gt;<br>
&gt;&gt; 1. connections between routers can be unnumbered 2. routers can be<=
br>
&gt;&gt; connected via LAN, in which case only DR announces the prefix.<br>
&gt;&gt;<br>
&gt;&gt; In summary, what you propose does not work.<br>
&gt;&gt;<br>
&gt;&gt; thanks,<br>
&gt;&gt; Peter<br>
&gt;&gt;<br>
&gt;&gt;<br>
&gt;&gt;<br>
&gt;&gt; On 23/07/18 09:49 , Aijun Wang wrote:<br>
&gt;&gt;&gt; (Sorry for my previous mail sent wrongly to the IDR mail list, p=
lease<br>
&gt;&gt;&gt; reply on this thread within the LSR wg)<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; Hi, Peter:<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; I am Aijun Wang from China Telecom, the author of draft about =E2=
=80=9COSPF<br>
&gt;&gt;&gt; extension for inter-area topology retrieval=E2=80=9D<br>
&gt;&gt;&gt; &lt;<a href=3D"https://datatracker.ietf.org/doc/draft-wang-lsr-=
ospf-inter-area-topo" rel=3D"noreferrer" target=3D"_blank">https://datatrack=
er.ietf.org/doc/draft-wang-lsr-ospf-inter-area-topo</a><br>
&gt;&gt;&gt; l ogy-ext/&gt;, which is presented by Mr.Jie Dong during the IE=
TF102<br>
&gt;&gt;&gt; meeting.<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; Thanks for your comments on the presentation material<br>
&gt;&gt;&gt;<br>
&gt;&gt; &lt;<a href=3D"https://datatracker.ietf.org/meeting/102/materials/s=
lides-102-lsr-osp" rel=3D"noreferrer" target=3D"_blank">https://datatracker.=
ietf.org/meeting/102/materials/slides-102-lsr-osp</a><br>
&gt;&gt; f-inte<br>
&gt;&gt; r-area-topology-retrieval-00&gt;.<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; Below are my explanation that regarding to the question about =E2=
=80=9Chow it<br>
&gt;&gt;&gt; retrievals the inter-area topology based on the extension infor=
mation=E2=80=9D:<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; Let=E2=80=99s see the graph that illustrates in Fig.1 at sectio=
n 3<br>
&gt;&gt;&gt; &lt;<a href=3D"https://tools.ietf.org/html/draft-wang-lsr-ospf-=
inter-area-topology-" rel=3D"noreferrer" target=3D"_blank">https://tools.iet=
f.org/html/draft-wang-lsr-ospf-inter-area-topology-</a><br>
&gt;&gt;&gt; e xt-00#section-3&gt; of the draft(I copy it also below for you=
r<br>
&gt;&gt;&gt; conveniences ):<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; Assuming we want to rebuild the connection between router S1 an=
d<br>
&gt;&gt;&gt; router<br>
&gt;&gt;&gt; S2 that locates in area 1:<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; 1)Normally, router S1 will advertise prefix N1 within its route=
r LSA<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; 2)When this router LSA reaches the ABR router R1, it will conve=
rt it<br>
&gt;&gt;&gt; into summary LSA, add the =E2=80=9CSource Router Information=E2=
=80=9D, which is<br>
&gt;&gt;&gt; router id of S1 in this example, as proposed in this draft.<br>=

&gt;&gt;&gt;<br>
&gt;&gt;&gt; 3)R1 then floods this extension summary LSA to R0, which is run=
ning<br>
&gt;&gt;&gt; BGP-LS protocol with IP SDN Controller. The controller then kno=
ws the<br>
&gt;&gt;&gt; prefixes of N1 is from S1.<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; 4)Router S2 will do the similar process, and the controller wil=
l also<br>
&gt;&gt;&gt; knows the prefixes N1 is also from S2<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; 5)Then it can reconstruct the connection between S1 and S2, whi=
ch<br>
&gt;&gt;&gt; prefix is N1. The topology within Area 1 can then be recovered<=
br>
&gt;&gt; accordingly.<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; Does the above explanation can answer your question. if so, I c=
an add<br>
&gt;&gt;&gt; it into the context of this draft in updated version.<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; Best Regards.<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; Aijun Wang<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; Network R&amp;D and Operation Support Department<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; China Telecom Corporation Limited Beijing Research Institute,Be=
ijing,<br>
&gt;&gt; China.<br>
&gt;&gt;&gt;<br>
&gt;&gt;<br>
&gt;&gt; _______________________________________________<br>
&gt;&gt; Lsr mailing list<br>
&gt;&gt; <a href=3D"mailto:Lsr@ietf.org" target=3D"_blank">Lsr@ietf.org</a><=
br>
&gt;&gt; <a href=3D"https://www.ietf.org/mailman/listinfo/lsr" rel=3D"norefe=
rrer" target=3D"_blank">https://www.ietf.org/mailman/listinfo/lsr</a><br>
&gt;&gt;<br>
&gt;&gt; _______________________________________________<br>
&gt;&gt; Lsr mailing list<br>
&gt;&gt; <a href=3D"mailto:Lsr@ietf.org" target=3D"_blank">Lsr@ietf.org</a><=
br>
&gt;&gt; <a href=3D"https://www.ietf.org/mailman/listinfo/lsr" rel=3D"norefe=
rrer" target=3D"_blank">https://www.ietf.org/mailman/listinfo/lsr</a><br>
&gt;&gt;<br>
&gt; <br>
&gt; _______________________________________________<br>
&gt; Lsr mailing list<br>
&gt; <a href=3D"mailto:Lsr@ietf.org" target=3D"_blank">Lsr@ietf.org</a><br>
&gt; <a href=3D"https://www.ietf.org/mailman/listinfo/lsr" rel=3D"noreferrer=
" target=3D"_blank">https://www.ietf.org/mailman/listinfo/lsr</a><br>
&gt; <br>
&gt; .<br>
&gt; <br>
<br>
_______________________________________________<br>
Lsr mailing list<br>
<a href=3D"mailto:Lsr@ietf.org" target=3D"_blank">Lsr@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/lsr" rel=3D"noreferrer" tar=
get=3D"_blank">https://www.ietf.org/mailman/listinfo/lsr</a><br>
</blockquote></div>
_______________________________________________<br>
Lsr mailing list<br>
<a href=3D"mailto:Lsr@ietf.org" target=3D"_blank">Lsr@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/lsr" rel=3D"noreferrer" tar=
get=3D"_blank">https://www.ietf.org/mailman/listinfo/lsr</a><br>
</blockquote></div>
</div></blockquote><blockquote type=3D"cite"><div><span>____________________=
___________________________</span><br><span>Lsr mailing list</span><br><span=
><a href=3D"mailto:Lsr@ietf.org">Lsr@ietf.org</a></span><br><span><a href=3D=
"https://www.ietf.org/mailman/listinfo/lsr">https://www.ietf.org/mailman/lis=
tinfo/lsr</a></span><br></div></blockquote></body></html>=

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Hi Aijun,

On 25/07/18 01:53 , Aijun Wang wrote:
> Hi, Ketan and Acee:
>
> I am working on the other use cases of "Source Router ID" extension, which may corresponding to that in RFC7794.

you want to use Extended Prefix LSA for advertising the "Source router 
ID", not the Summary LSA.

thanks,
Peter



> Once finished, I will update the draft.
> RFC5392 and RFC5316 are for inter-AS TE extension, not inter-area scenario and solution that proposed in this draft.
>
> -----é‚®ä»¶åŽŸä»¶-----
> å�‘ä»¶äºº: Ketan Talaulikar (ketant) [mailto:ketant@cisco.com]
> å�‘é€�æ—¶é—´: 2018å¹´7æœˆ24æ—¥ 23:56
> æ”¶ä»¶äºº: Acee Lindem (acee); Peter Psenak (ppsenak); Aijun Wang; 'Rob Shakir'
> æŠ„é€�: 'Dongjie (Jimmy)'; chopps@chopps.org; lsr@ietf.org
> ä¸»é¢˜: RE: ç­”å¤�: [Lsr] ç­”å¤�: ç­”å¤�: Regarding OSPF extension for inter-area topology retrieval
>
> Ack and IMHO the reference to this inter-AS use-case should be removed as it is very specific and works in very limited cases as opposed to rfc5392 which presented a proper OSPF solution for this specific problem (rfc5316 does same for IS-IS).
>
> Thanks,
> Ketan
>
> -----Original Message-----
> From: Acee Lindem (acee)
> Sent: 24 July 2018 10:37
> To: Ketan Talaulikar (ketant) <ketant@cisco.com>; Peter Psenak (ppsenak) <ppsenak@cisco.com>; Aijun Wang <wangaijun@tsinghua.org.cn>; 'Rob Shakir' <rjs@rob.sh>
> Cc: 'Dongjie (Jimmy)' <jie.dong@huawei.com>; chopps@chopps.org; lsr@ietf.org
> Subject: Re: ç­”å¤�: [Lsr] ç­”å¤�: ç­”å¤�: Regarding OSPF extension for inter-area topology retrieval
>
> Hi Ketan,
>
> ï»¿On 7/24/18, 7:44 AM, "Ketan Talaulikar (ketant)" <ketant@cisco.com> wrote:
>
>      Hi Aijun,
>
>      Your draft introduces the Source Router ID which is, by itself, an useful protocol extension.
>
> I agree. What is the use case for advertisement in IS-IS? Perhaps this could be used as the primary motivation.
>
>
>     However, the use-case on inter-as topology retrieval has issues which has been shared by many of us at the mike, offline and on the list.
>
> And this could be moved to an appendix or even completely.
>
> Thanks,
> Acee
>
>      Could you consider de-coupling the two?
>
>      Also, if the proposal for learning inter-AS as described by you works for your own specific network design (and you don't think any of the points made affect that decision), then please go ahead. However, I do not see the point of trying to get that as an IETF document?
>
>      Thanks,
>      Ketan
>
>      -----Original Message-----
>      From: Peter Psenak (ppsenak)
>      Sent: 24 July 2018 04:22
>      To: Aijun Wang <wangaijun@tsinghua.org.cn>; 'Rob Shakir' <rjs@rob.sh>
>      Cc: 'Dongjie (Jimmy)' <jie.dong@huawei.com>; chopps@chopps.org; Ketan Talaulikar (ketant) <ketant@cisco.com>; lsr@ietf.org; Acee Lindem (acee) <acee@cisco.com>
>      Subject: Re: ç­”å¤�: [Lsr] ç­”å¤�: ç­”å¤�: Regarding OSPF extension for inter-area topology retrieval
>
>      Hi Aijun,
>
>      On 24/07/18 05:37 , Aijun Wang wrote:
>      > _Hi, Peter:_
>      >
>      > For point-to-point interface, as described in  OSPFv2(RFC2328 12.4.1.1.  Describing point-to-point interfaces)  <https://tools.ietf.org/html/rfc2328#page-130>, the router LSA will include two links description for each interface, within which the â€œtype 3 linkâ€�(stub network) will describe the subnet mask of the point-to-point interface.
>      >
>      > For broadcast/NBMA interface, the DR will be elected and it will
>      > generate the network LSA which will include also the subnet mask of
>      > the connected interface.
>      >
>      > For unnumbered and virtual link, if you consider we should include
>      > them also for all possible scenarios even if we seldom use them in
>      > large network, we can consider expand the summary LSA to cover it, as
>      > done by this draft.
>
>      there is no way to address unnumbered p2p case your way, because there is no Summary LSA generated to other area in such case.
>
>      Anyway, reconstructing a topology of a remote area based on the prefix announcements that come from it is a broken concept. I have given you several examples where your proposal does not work.
>
>      thanks,
>      Peter
>
>      >
>      > For Anycast prefixes situation that you described(although we seldom
>      > plan our network in such way), the PCE controller will not deduce the
>      > wrong information from the reported information------Different router
>      > advertise the same prefix, why canâ€™t they be connected in logically?
>      >
>      > On summary, the ABR can know and report the originator of the
>      > connected interfaceâ€™s prefixes, and also the connected information for
>      > the unnumbered/virtual link from the traditional router LSA/network
>      > LSA message, thus can transfer them to the router that run BGP-LS,
>      > then to the PCE controller to retrieval the topology.
>      >
>      > _To Rob: _
>      >
>      > BGP-LS is one prominent method to get the underlay network topology
>      > and has more flexibility to control the topology export as described
>      > in RFC
>      > 7752 <https://tools.ietf.org/html/rfc7752#section-1>.
>      >
>      > Solution 1) that you proposed is possible, but we will not run two
>      > different methods to get the topology.
>      >
>      > Solution 2) is also one possible deployment, but it eliminates the
>      > advantage of the BGP-LS, in which it needs several interaction points
>      > with the underlay network. and such deployment is not belong to
>      > redundancy category as information got from different areaes are different.
>      >
>      > Solution 3)--Streaming telemetry technology should be used mainly for
>      > the monitor of network devices, it requires the PCE controller to
>      > contact with every router in the network, is also not the optimal
>      > solution when compared with BGP-LS.
>      >
>      > We can update the current draft to include all possible scenarios that
>      > we are not aiming at beginning for integrity consideration. The
>      > proposed extension does not add to complexity of IGP. What we
>      > discussed here is the complexity of IGP protocol itself.
>      >
>      > Best Regards.
>      >
>      > Aijun Wang
>      >
>      > Network R&D and Operation Support Department
>      >
>      > China Telecom Corporation Limited Beijing Research Institute,Beijing, China.
>      >
>      > *å�‘ä»¶äºº:*Rob Shakir [mailto:rjs@rob.sh]
>      > *å�‘é€�æ—¶é—´:*2018å¹´7æœˆ24æ—¥7:04
>      > *æ”¶ä»¶äºº:*Peter Psenak
>      > *æŠ„é€�:*Dongjie (Jimmy); chopps@chopps.org; Ketan Talaulikar (ketant);
>      > Aijun Wang; lsr@ietf.org; Acee Lindem (acee)
>      > *ä¸»é¢˜:*Re: [Lsr] ç­”å¤�: ç­”å¤�: Regarding OSPF extension for inter-area
>      > topology retrieval
>      >
>      > +1 to Peter. We should not define fragile solutions within the IETF.
>      >
>      > There are also a multitude of other solutions here already:
>      >
>      > 1) IGP adjacency with one router in each area (at a minimum - probably
>      > two for a robust system) over a tunnel. Deployed in many networks for
>      > years.
>      > 2) BGP-LS to one router (ditto robustness comment) in each area.
>      > 3) streaming telemetry of the LSDB contents via gNMI.
>      >
>      > All these solutions exist in shipping implementations - please letâ€™s
>      > not add to the system complexity of the IGP here.
>      >
>      > r.
>      >
>      > On Mon, Jul 23, 2018 at 12:30 Peter Psenak
>      > <ppsenak=40cisco.com@dmarc.ietf.org
>      > <mailto:40cisco.com@dmarc.ietf.org>>
>      > wrote:
>      >
>      >     Hi Aijun,
>      >
>      >     On 23/07/18 13:07 , Aijun Wang wrote:
>      >     > Hi, Peter:
>      >     >
>      >     > For routers that connected by LAN, the router will establish adjacent
>      >     > neighbor with DR, but not only DR advertises the connected prefixes.
>      >
>      >     only the Network LSA includes the network mask, other routers would
>      >     include the interface address only.
>      >
>      >
>      >     > DR and
>      >     > DRother will all advertise type 1 and type 2 LSA with each other, then the
>      >     > process and proposal described in this draft will still work.
>      >     > We seldom use the ip unnumbered features in our network, can we ignore it
>      >     > then? Or other persons has some idea on such situation?
>      >
>      >     the fact that you do not use unnumbered is not really relevant. IETF
>      >     defines solutions that MUST work for all possible scenarios, not only
>      >     for a specific one.
>      >
>      >     > Anycast prefixes are often /32 long, this can be easily filtered by SDN
>      >     > controller because the link prefixes between two routers will be no larger
>      >     > than /32 for IPv4 network.
>      >
>      >     protocol allows to advertise the same prefix with an arbitrary mask from
>      >     multiple routers without these routers being directly connected. Your
>      >     proposal is based on the assumptions that are incorrect.
>      >
>      >     thanks,
>      >     Peter
>      >
>      >     >
>      >     > Best Regards.
>      >     >
>      >     > Aijun Wang
>      >     > Network R&D and Operation Support Department
>      >     > China Telecom Corporation Limited Beijing Research Institute,Beijing, China.
>      >     >
>      >     > -----é‚®ä»¶åŽŸä»¶-----
>      >     >å�‘ä»¶äºº: Peter Psenak [mailto:ppsenak
>      >     <mailto:ppsenak>=40cisco.com@dmarc.ietf.org
>      >     <mailto:40cisco.com@dmarc.ietf.org>]
>      >     >å�‘é€�æ—¶é—´: 2018å¹´7æœˆ23æ—¥18:20
>      >     >æ”¶ä»¶äºº: Aijun Wang; 'Peter Psenak'; chopps@chopps.org
>      >     <mailto:chopps@chopps.org>
>      >     >æŠ„é€�: lsr@ietf.org <mailto:lsr@ietf.org>; 'Ketan Talaulikar
>      >     (ketant)'; 'Acee Lindem (acee)';
>      >     > 'Dongjie (Jimmy)'
>      >     >ä¸»é¢˜: Re: [Lsr] ç­”å¤�: Regarding OSPF extension for inter-area topology
>      >     > retrieval
>      >     >
>      >     > Hi Aijun,
>      >     >
>      >     > On 23/07/18 11:16 , Aijun Wang wrote:
>      >     >> Hi, Peter:
>      >     >>
>      >     >> Actually, I consider mainly the point-to-point connection and the
>      >     >> numbered interface, which are normal in our network.
>      >     >> For the two situations that you mentioned, I will investigation the
>      >     >> possible solutions and feedback you later.
>      >     >>
>      >     >> For the point-to-point and numbered interface, do you have other
>      >     >> questions then?
>      >     >
>      >     > the fact that two routers announce the same subnet, does not mean they are
>      >     > connected together by p2p link. Anycast prefix is an example.
>      >     >
>      >     > The idea you are proposing simply does not work.
>      >     >
>      >     > thanks,
>      >     > Peter
>      >     >
>      >     >
>      >     >>
>      >     >> Best Regards.
>      >     >>
>      >     >> Aijun Wang
>      >     >> Network R&D and Operation Support Department China Telecom Corporation
>      >     >> Limited Beijing Research Institute,Beijing, China.
>      >     >>
>      >     >> -----é‚®ä»¶åŽŸä»¶-----
>      >     >>å�‘ä»¶äºº: Peter Psenak [mailto:ppsenak
>      >     <mailto:ppsenak>=40cisco.com@dmarc.ietf.org
>      >     <mailto:40cisco.com@dmarc.ietf.org>]
>      >     >>å�‘é€�æ—¶é—´: 2018å¹´7æœˆ23æ—¥16:15
>      >     >>æ”¶ä»¶äºº: Aijun Wang; chopps@chopps.org <mailto:chopps@chopps.org>
>      >     >>æŠ„é€�: lsr@ietf.org <mailto:lsr@ietf.org>; 'Ketan Talaulikar
>      >     (ketant)'; 'Acee Lindem (acee)';
>      >     >> 'Dongjie (Jimmy)'
>      >     >>ä¸»é¢˜: Re: [Lsr] Regarding OSPF extension for inter-area topology
>      >     >> retrieval
>      >     >>
>      >     >> Hi Aijun,
>      >     >>
>      >     >> you are trying to reconstruct the topology of the remote area based on
>      >     >> the fact that two routers are connected to the same subnet. It does
>      >     >> not work
>      >     >> because:
>      >     >>
>      >     >> 1. connections between routers can be unnumbered 2. routers can be
>      >     >> connected via LAN, in which case only DR announces the prefix.
>      >     >>
>      >     >> In summary, what you propose does not work.
>      >     >>
>      >     >> thanks,
>      >     >> Peter
>      >     >>
>      >     >>
>      >     >>
>      >     >> On 23/07/18 09:49 , Aijun Wang wrote:
>      >     >>> (Sorry for my previous mail sent wrongly to the IDR mail list, please
>      >     >>> reply on this thread within the LSR wg)
>      >     >>>
>      >     >>> Hi, Peter:
>      >     >>>
>      >     >>> I am Aijun Wang from China Telecom, the author of draft about â€œOSPF
>      >     >>> extension for inter-area topology retrievalâ€�
>      >     >>> <https://datatracker.ietf.org/doc/draft-wang-lsr-ospf-inter-area-topo
>      >     >>> l ogy-ext/>, which is presented by Mr.Jie Dong during the IETF102
>      >     >>> meeting.
>      >     >>>
>      >     >>> Thanks for your comments on the presentation material
>      >     >>>
>      >     >> <https://datatracker.ietf.org/meeting/102/materials/slides-102-lsr-osp
>      >     >> f-inte
>      >     >> r-area-topology-retrieval-00>.
>      >     >>>
>      >     >>> Below are my explanation that regarding to the question about â€œhow it
>      >     >>> retrievals the inter-area topology based on the extension informationâ€�:
>      >     >>>
>      >     >>> Letâ€™s see the graph that illustrates in Fig.1 at section 3
>      >     >>> <https://tools.ietf.org/html/draft-wang-lsr-ospf-inter-area-topology-
>      >     >>> e xt-00#section-3> of the draft(I copy it also below for your
>      >     >>> conveniences ):
>      >     >>>
>      >     >>> Assuming we want to rebuild the connection between router S1 and
>      >     >>> router
>      >     >>> S2 that locates in area 1:
>      >     >>>
>      >     >>> 1)Normally, router S1 will advertise prefix N1 within its router LSA
>      >     >>>
>      >     >>> 2)When this router LSA reaches the ABR router R1, it will convert it
>      >     >>> into summary LSA, add the â€œSource Router Informationâ€�, which is
>      >     >>> router id of S1 in this example, as proposed in this draft.
>      >     >>>
>      >     >>> 3)R1 then floods this extension summary LSA to R0, which is running
>      >     >>> BGP-LS protocol with IP SDN Controller. The controller then knows the
>      >     >>> prefixes of N1 is from S1.
>      >     >>>
>      >     >>> 4)Router S2 will do the similar process, and the controller will also
>      >     >>> knows the prefixes N1 is also from S2
>      >     >>>
>      >     >>> 5)Then it can reconstruct the connection between S1 and S2, which
>      >     >>> prefix is N1. The topology within Area 1 can then be recovered
>      >     >> accordingly.
>      >     >>>
>      >     >>> Does the above explanation can answer your question. if so, I can add
>      >     >>> it into the context of this draft in updated version.
>      >     >>>
>      >     >>> Best Regards.
>      >     >>>
>      >     >>> Aijun Wang
>      >     >>>
>      >     >>> Network R&D and Operation Support Department
>      >     >>>
>      >     >>> China Telecom Corporation Limited Beijing Research Institute,Beijing,
>      >     >> China.
>      >     >>>
>      >     >>
>      >     >> _______________________________________________
>      >     >> Lsr mailing list
>      >     >>Lsr@ietf.org <mailto:Lsr@ietf.org>
>      >     >>https://www.ietf.org/mailman/listinfo/lsr
>      >     >>
>      >     >> _______________________________________________
>      >     >> Lsr mailing list
>      >     >>Lsr@ietf.org <mailto:Lsr@ietf.org>
>      >     >>https://www.ietf.org/mailman/listinfo/lsr
>      >     >>
>      >     >
>      >     > _______________________________________________
>      >     > Lsr mailing list
>      >     >Lsr@ietf.org <mailto:Lsr@ietf.org>
>      >     >https://www.ietf.org/mailman/listinfo/lsr
>      >     >
>      >     > .
>      >     >
>      >
>      >     _______________________________________________
>      >     Lsr mailing list
>      >     Lsr@ietf.org <mailto:Lsr@ietf.org>
>      >     https://www.ietf.org/mailman/listinfo/lsr
>      >
>
>
>
>
> .
>


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Subject: Re: [Lsr] I-D Action: draft-ietf-ospf-lls-interface-id-05.txt
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Hi Yingzhen,

sure, I fix it with other comments that may come.

thanks,
Peter

On 25/07/18 06:10 , Yingzhen Qu wrote:
> Hi authors,
>
> I just run idnits against version 05, and there is still a warning:
>
>    Miscellaneous warnings:
>    ----------------------------------------------------------------------------
>
>    == The document seems to lack the recommended RFC 2119 boilerplate, even if
>       it appears to use RFC 2119 keywords -- however, there's a paragraph with
>       a matching beginning. Boilerplate error?
>
>       RFC 8174, paragraph 11:
>          The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
>          "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY",
>          and "OPTIONAL" in this document are to be interpreted as
>          described in BCP 14 [RFC2119] [RFC8174] when, and only when, they
>          appear in all capitals, as shown here.
>
>       ... text found in draft:
>          The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
>          "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY",
>          and "OPTIONAL" in this document are to be interpreted as
>          described in BCP14 [RFC2119] [RFC8174] when, and only when, they
> ........................^
>          appear in all capitals, as shown here.
>
>
> This is really minor. I suppose you can fix it later with other comments if there is any.
>
> Thanks,
> Yingzhen
>
>
> On 7/18/18, 4:33 AM, "Lsr on behalf of internet-drafts@ietf.org" <lsr-bounces@ietf.org on behalf of internet-drafts@ietf.org> wrote:
>
>
>      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           : OSPF LLS Extensions for Local Interface ID Advertisement
>              Authors         : Peter Psenak
>                                Ketan Jivan Talaulikar
>                                Wim Henderickx
>                                Padma Pillay-Esnault
>      	Filename        : draft-ietf-ospf-lls-interface-id-05.txt
>      	Pages           : 7
>      	Date            : 2018-07-18
>
>      Abstract:
>         Every OSPF interface is assigned an identifier, Interface ID, which
>         uniquely identifies the interface on the router.  In some cases it is
>         useful to know the Interface ID assigned by the adjacent router on
>         its side of the adjacency (Remote Interface ID).
>
>         This draft describes the extensions to OSPF link-local signalling to
>         advertise the Local Interface Identifier.
>
>
>
>      The IETF datatracker status page for this draft is:
>      https://datatracker.ietf.org/doc/draft-ietf-ospf-lls-interface-id/
>
>      There are also htmlized versions available at:
>      https://tools.ietf.org/html/draft-ietf-ospf-lls-interface-id-05
>      https://datatracker.ietf.org/doc/html/draft-ietf-ospf-lls-interface-id-05
>
>      A diff from the previous version is available at:
>      https://www.ietf.org/rfcdiff?url2=draft-ietf-ospf-lls-interface-id-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.
>
>      Internet-Drafts are also available by anonymous FTP at:
>      ftp://ftp.ietf.org/internet-drafts/
>
>      _______________________________________________
>      Lsr mailing list
>      Lsr@ietf.org
>      https://www.ietf.org/mailman/listinfo/lsr
>
>


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From nobody Thu Jul 26 15:21:26 2018
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Subject: [Lsr] I-D Action: draft-ietf-ospf-yang-13.txt
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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           : Yang Data Model for OSPF Protocol
        Authors         : Derek Yeung
                          Yingzhen Qu
                          Jeffrey Zhang
                          Ing-Wher Chen
                          Acee Lindem
	Filename        : draft-ietf-ospf-yang-13.txt
	Pages           : 113
	Date            : 2018-07-26

Abstract:
   This document defines a YANG data model that can be used to configure
   and manage OSPF.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-ospf-yang/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-ospf-yang-13
https://datatracker.ietf.org/doc/html/draft-ietf-ospf-yang-13

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From nobody Tue Jul 31 07:07:03 2018
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Subject: [Lsr] I-D Action: draft-ietf-isis-mpls-elc-05.txt
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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           : Signaling Entropy Label Capability and Entropy Readable Label Depth Using IS-IS
        Authors         : Xiaohu Xu
                          Sriganesh Kini
                          Siva Sivabalan
                          Clarence Filsfils
                          Stephane Litkowski
	Filename        : draft-ietf-isis-mpls-elc-05.txt
	Pages           : 7
	Date            : 2018-07-29

Abstract:
   Multiprotocol Label Switching (MPLS) has defined a mechanism to load
   balance traffic flows using Entropy Labels (EL).  An ingress Label
   Switching Router (LSR) cannot insert ELs for packets going into a
   given tunnel unless an egress LSR has indicated via signaling that it
   has the capability of processing ELs, referred to as Entropy Label
   Capability (ELC), on that tunnel.  In addition, it would be useful
   for ingress LSRs to know each LSR's capability of reading the maximum
   label stack depth and performing EL-based load-balancing, referred to
   as Entropy Readable Label Depth (ERLD), in the cases where stacked
   LSPs are used for whatever reasons.  This document defines mechanisms
   to signal these two capabilities using IS-IS.  These mechanisms are
   useful when the label advertisement is also done via IS-IS.  In
   addition, this document introduces the Non-IGP Functional
   Capabilities Sub-TLV for advertising IS-IS router's actual non-IGP
   functional capabilities.  ELC is one of such non-IGP functional
   capabilities.


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https://datatracker.ietf.org/doc/draft-ietf-isis-mpls-elc/

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https://tools.ietf.org/html/draft-ietf-isis-mpls-elc-05
https://datatracker.ietf.org/doc/html/draft-ietf-isis-mpls-elc-05

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https://www.ietf.org/rfcdiff?url2=draft-ietf-isis-mpls-elc-05


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Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/

