
From internet-drafts@ietf.org  Thu May  3 07:13:09 2012
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Date: Thu, 03 May 2012 07:13:08 -0700
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Subject: [Idr] I-D Action: draft-ietf-idr-bgp-optimal-route-reflection-02.txt
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A New Internet-Draft is available from the on-line Internet-Drafts director=
ies. This draft is a work item of the Inter-Domain Routing Working Group of=
 the IETF.

	Title           : BGP Optimal Route Reflection (BGP-ORR)
	Author(s)       : Robert Raszuk
                          Christian Cassar
                          Erik Aman
                          Bruno Decraene
	Filename        : draft-ietf-idr-bgp-optimal-route-reflection-02.txt
	Pages           : 19
	Date            : 2012-05-03

   [RFC4456] asserts that, because the Interior Gateway Protocol (IGP)
   cost to a given point in the network will vary across routers, "the
   route reflection approach may not yield the same route selection
   result as that of the full IBGP mesh approach."  One practical
   implication of this assertion is that the deployment of route
   reflection may thwart the ability to achieve hot potato routing.  Hot
   potato routing attempts to direct traffic to the closest AS egress
   point in cases where no higher priority policy dictates otherwise.
   As a consequence of the route reflection method, the choice of exit
   point for a route reflector and its clients will be the egress point
   closest to the route reflector - and not necessarily closest to the
   RR clients.

   Section 11 of [RFC4456] describes a deployment approach and a set of
   constraints which, if satsified, would result in the deployment of
   route reflection yielding the same results as the iBGP full mesh
   approach.  Such a deployment approach would make route reflection
   compatible with the application of hot potato routing policy.

   As networks evolved to accommodate architectural requirements of new
   services, tunneled (LSP/IP tunneling) networks with centralized route
   reflectors became commonplace.  This is one type of common deployment
   where it would be impractical to satisfy the constraints described in
   Section 11 of [RFC4456].  Yet, in such an environment, hot potato
   routing policy remains desirable.

   This document proposes two new solutions which can be deployed to
   facilitate the application of closest exit point policy centralized
   route reflection deployments.


A URL for this Internet-Draft is:
http://www.ietf.org/internet-drafts/draft-ietf-idr-bgp-optimal-route-reflec=
tion-02.txt

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

This Internet-Draft can be retrieved at:
ftp://ftp.ietf.org/internet-drafts/draft-ietf-idr-bgp-optimal-route-reflect=
ion-02.txt

The IETF datatracker page for this Internet-Draft is:
https://datatracker.ietf.org/doc/draft-ietf-idr-bgp-optimal-route-reflectio=
n/


From wwwrun@rfc-editor.org  Mon May  7 12:07:31 2012
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Subject: [Idr] RFC 6608 on Subcodes for BGP Finite State Machine Error
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A new Request for Comments is now available in online RFC libraries.

        
        RFC 6608

        Title:      Subcodes for BGP Finite State 
                    Machine Error 
        Author:     J. Dong, M. Chen,
                    A. Suryanarayana
        Status:     Standards Track
        Stream:     IETF
        Date:       May 2012
        Mailbox:    jie.dong@huawei.com, 
                    mach.chen@huawei.com, 
                    asuryana@cisco.com
        Pages:      5
        Characters: 8612
        Updates:    RFC4271

        I-D Tag:    draft-ietf-idr-fsm-subcode-03.txt

        URL:        http://www.rfc-editor.org/rfc/rfc6608.txt

This document defines several subcodes for the BGP Finite State
Machine (FSM) Error that could provide more information to help
network operators in diagnosing BGP FSM issues and correlating
network events.  This document updates RFC 4271.  [STANDARDS-TRACK]

This document is a product of the Inter-Domain Routing Working Group of the IETF.

This is now a Proposed Standard Protocol.

STANDARDS TRACK: This document specifies an Internet standards track
protocol for the Internet community,and requests discussion and suggestions
for improvements.  Please refer to the current edition of the Internet
Official Protocol Standards (STD 1) for the standardization state and
status of this protocol.  Distribution of this memo is unlimited.

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The RFC Editor Team
Association Management Solutions, LLC



From internet-drafts@ietf.org  Mon May  7 14:03:55 2012
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Subject: [Idr] I-D Action: draft-ietf-idr-as0-04.txt
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A New Internet-Draft is available from the on-line Internet-Drafts director=
ies. This draft is a work item of the Inter-Domain Routing Working Group of=
 the IETF.

	Title           : Codification of AS 0 processing.
	Author(s)       : Warren Kumari
                          Randy Bush
                          Heather Schiller
                          Keyur Patel
	Filename        : draft-ietf-idr-as0-04.txt
	Pages           : 7
	Date            : 2012-05-07

   This document updates RFC 4271 and proscribes the use of AS 0 in BGP
   OPEN and AS_PATH / AS4_PATH BGP attribute.


A URL for this Internet-Draft is:
http://www.ietf.org/internet-drafts/draft-ietf-idr-as0-04.txt

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This Internet-Draft can be retrieved at:
ftp://ftp.ietf.org/internet-drafts/draft-ietf-idr-as0-04.txt

The IETF datatracker page for this Internet-Draft is:
https://datatracker.ietf.org/doc/draft-ietf-idr-as0/


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Subject: [Idr] Adoption of draft-djsmith-bgp-flowspec-oid-01 as IDR WG document
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Folks,

We have received a request from the authors to adopt =
draft-djsmith-bgp-flowspec-oid-01 as an IDR WG document.  Please send =
your comments to the list.  The deadline for comments is June 1, 2012 at =
noon EDT.

Thanks,

--John

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Support.

-Keyur


On 5/16/12 12:40 PM, "John G. Scudder" <jgs@juniper.net> wrote:

> Folks,
> 
> We have received a request from the authors to adopt
> draft-djsmith-bgp-flowspec-oid-01 as an IDR WG document.  Please send your
> comments to the list.  The deadline for comments is June 1, 2012 at noon EDT.
> 
> Thanks,
> 
> --John
> _______________________________________________
> Idr mailing list
> Idr@ietf.org
> https://www.ietf.org/mailman/listinfo/idr


From robert@raszuk.net  Wed May 16 13:19:13 2012
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Hi,

I support the adoption of this draft as WG document.

However the new text authors added between -00 and -01 seems too 
restrictive to the original theme/direction.

It says:

".. or the AS_PATH attribute of the flow specification is empty."

That precludes injecting and honoring the flow routes even within the 
same administrative domain in the presence of confederations.

I recommend that this limitation should be removed in next version.

Regards,
R.



> Folks,
>
> We have received a request from the authors to adopt
> draft-djsmith-bgp-flowspec-oid-01 as an IDR WG document.  Please send
> your comments to the list.  The deadline for comments is June 1, 2012
> at noon EDT.
>
> Thanks,
>
> --John _______________________________________________ Idr mailing
> list Idr@ietf.org https://www.ietf.org/mailman/listinfo/idr
>
>


From randy@psg.com  Wed May 16 13:21:28 2012
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Subject: Re: [Idr] Adoption of draft-djsmith-bgp-flowspec-oid-01 as IDR WG	document
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> We have received a request from the authors to adopt
> draft-djsmith-bgp-flowspec-oid-01 as an IDR WG document.

have read lightly.  agree it is a reasonable wg work item.

of course, i like centralization about as much as i like large telco
switches, nat444, ....  but that does not detract from this being a
perfectly reasonable work item.

randy

From keyupate@cisco.com  Wed May 16 14:17:22 2012
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From: Keyur Patel <keyupate@cisco.com>
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One comment and one question on the draft.

1) I believe the rule should cover checks for AS4_PATH as well.

2) Section 6 from RFC5575

<snip>
BGP implementations MUST also enforce that the AS_PATH attribute of a
   route received via the External Border Gateway Protocol (eBGP)
   contains the neighboring AS in the left-most position of the AS_PATH
   attribute.  While this rule is optional in the BGP specification, it
   becomes necessary to enforce it for security reasons.
<snip>

Do we need to do a complete aspath check instead? Otherwise, a neighboring
AS can inject a bogus flowspec route?

Regards,
Keyur


On 5/16/12 1:19 PM, "Robert Raszuk" <robert@raszuk.net> wrote:

> Hi,
> 
> I support the adoption of this draft as WG document.
> 
> However the new text authors added between -00 and -01 seems too
> restrictive to the original theme/direction.
> 
> It says:
> 
> ".. or the AS_PATH attribute of the flow specification is empty."
> 
> That precludes injecting and honoring the flow routes even within the
> same administrative domain in the presence of confederations.
> 
> I recommend that this limitation should be removed in next version.
> 
> Regards,
> R.
> 
> 
> 
>> Folks,
>> 
>> We have received a request from the authors to adopt
>> draft-djsmith-bgp-flowspec-oid-01 as an IDR WG document.  Please send
>> your comments to the list.  The deadline for comments is June 1, 2012
>> at noon EDT.
>> 
>> Thanks,
>> 
>> --John _______________________________________________ Idr mailing
>> list Idr@ietf.org https://www.ietf.org/mailman/listinfo/idr
>> 
>> 
> 
> _______________________________________________
> Idr mailing list
> Idr@ietf.org
> https://www.ietf.org/mailman/listinfo/idr


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Subject: Re: [Idr] Adoption of draft-djsmith-bgp-flowspec-oid-01 as IDR WG document
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Hi Keyur,

Actually you bring a good point. Going by section 6 would preclude 
reception of flow-spec routes across IX route servers as in those cases 
enforcing-first-as must be disabled on the IX client.

Perhaps as you suggest we should replace section 6 of current 5575 with 
the full AS_PATH check regardless if enforce-first-as is in effect there 
or not.

Comments ?

Thx,
R.

> One comment and one question on the draft.
>
> 1) I believe the rule should cover checks for AS4_PATH as well.
>
> 2) Section 6 from RFC5575
>
> <snip>
> BGP implementations MUST also enforce that the AS_PATH attribute of a
>     route received via the External Border Gateway Protocol (eBGP)
>     contains the neighboring AS in the left-most position of the AS_PATH
>     attribute.  While this rule is optional in the BGP specification, it
>     becomes necessary to enforce it for security reasons.
> <snip>
>
> Do we need to do a complete aspath check instead? Otherwise, a neighboring
> AS can inject a bogus flowspec route?
>
> Regards,
> Keyur
>
>
> On 5/16/12 1:19 PM, "Robert Raszuk"<robert@raszuk.net>  wrote:
>
>> Hi,
>>
>> I support the adoption of this draft as WG document.
>>
>> However the new text authors added between -00 and -01 seems too
>> restrictive to the original theme/direction.
>>
>> It says:
>>
>> ".. or the AS_PATH attribute of the flow specification is empty."
>>
>> That precludes injecting and honoring the flow routes even within the
>> same administrative domain in the presence of confederations.
>>
>> I recommend that this limitation should be removed in next version.
>>
>> Regards,
>> R.




From keyupate@cisco.com  Wed May 16 14:43:29 2012
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Date: Wed, 16 May 2012 14:46:20 -0700
From: Keyur Patel <keyupate@cisco.com>
To: <robert@raszuk.net>
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Thread-Topic: [Idr] Adoption of draft-djsmith-bgp-flowspec-oid-01 as IDR WG document
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Subject: Re: [Idr] Adoption of draft-djsmith-bgp-flowspec-oid-01 as IDR WG document
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Yep. In that case, the enforce-first-as text [RFC5575] could be relaxed and
modified as well (We would need a uniform enforce-first-as policy between
the flowspec and unicast afi/safis and that would work when comparing
aspaths).

Regards,
Keyur


On 5/16/12 2:24 PM, "Robert Raszuk" <robert@raszuk.net> wrote:

> Hi Keyur,
> 
> Actually you bring a good point. Going by section 6 would preclude
> reception of flow-spec routes across IX route servers as in those cases
> enforcing-first-as must be disabled on the IX client.
> 
> Perhaps as you suggest we should replace section 6 of current 5575 with
> the full AS_PATH check regardless if enforce-first-as is in effect there
> or not.
> 
> Comments ?
> 
> Thx,
> R.
> 
>> One comment and one question on the draft.
>> 
>> 1) I believe the rule should cover checks for AS4_PATH as well.
>> 
>> 2) Section 6 from RFC5575
>> 
>> <snip>
>> BGP implementations MUST also enforce that the AS_PATH attribute of a
>>     route received via the External Border Gateway Protocol (eBGP)
>>     contains the neighboring AS in the left-most position of the AS_PATH
>>     attribute.  While this rule is optional in the BGP specification, it
>>     becomes necessary to enforce it for security reasons.
>> <snip>
>> 
>> Do we need to do a complete aspath check instead? Otherwise, a neighboring
>> AS can inject a bogus flowspec route?
>> 
>> Regards,
>> Keyur
>> 
>> 
>> On 5/16/12 1:19 PM, "Robert Raszuk"<robert@raszuk.net>  wrote:
>> 
>>> Hi,
>>> 
>>> I support the adoption of this draft as WG document.
>>> 
>>> However the new text authors added between -00 and -01 seems too
>>> restrictive to the original theme/direction.
>>> 
>>> It says:
>>> 
>>> ".. or the AS_PATH attribute of the flow specification is empty."
>>> 
>>> That precludes injecting and honoring the flow routes even within the
>>> same administrative domain in the presence of confederations.
>>> 
>>> I recommend that this limitation should be removed in next version.
>>> 
>>> Regards,
>>> R.
> 
> 
> 


From randy@psg.com  Wed May 16 15:25:27 2012
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Cc: "idr@ietf.org List" <idr@ietf.org>, robert@raszuk.net
Subject: [Idr] draft-djsmith-bgp-flowspec-oid-01.txt
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first, we are now discussing the draft, not whether it should be a wg
item.  so i have changed $subject

> Do we need to do a complete aspath check instead? Otherwise, a
> neighboring AS can inject a bogus flowspec route?

this draft has wonderful text in the security section

   No new security issues are introduced by relaxing the validation
   procedure for IBGP learned flow specifications. With this proposal,
   the security characteristics of BGP flow specifications remain
   equivalent to the existing security properties of BGP unicast
   routing.  Traffic flow specifications learned from IBGP peers are
   trusted, hence, its not required to validate that the originator of
   an intra-domain traffic flow specification matches the originator of
   the best-match unicast route for the flow destination prefix.
   Conversely, this proposal continues to enforce the validation
   procedure for EBGP learned traffic flow specifications. In this way,
   the security properties of RFC 5575 are maintained such that an EBGP
   peer cannot cause a denial-of-service attack by advertising an
   inter-domain flow specification for a destination prefix that it does
   not provide reachability information for.

you gotta love the ref to 5575 which essentially says you have no
protection, abandon all hope ye who enter

randy

From robert@raszuk.net  Wed May 16 15:36:33 2012
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Subject: Re: [Idr] draft-djsmith-bgp-flowspec-oid-01.txt
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> you gotta love the ref to 5575 which essentially says you have no
> protection, abandon all hope ye who enter

For the record .. this is not what below quote says.

    No new security issues are introduced by relaxing the validation
    procedure for IBGP learned flow specifications. With this proposal,
    the security characteristics of BGP flow specifications remain
    equivalent to the existing security properties of BGP unicast
    routing.  Traffic flow specifications learned from IBGP peers are
    trusted, hence, its not required to validate that the originator of
    an intra-domain traffic flow specification matches the originator of
    the best-match unicast route for the flow destination prefix.
    Conversely, this proposal continues to enforce the validation
    procedure for EBGP learned traffic flow specifications. In this way,
    the security properties of RFC 5575 are maintained such that an EBGP
    peer cannot cause a denial-of-service attack by advertising an
    inter-domain flow specification for a destination prefix that it does
    not provide reachability information for.

Explanation:

The RFC says that for IBGP even with relaxed validation you get what you 
have today .. provided that you know how to protect your AS in the first 
place.

For EBGP the validation is in place and matching last AS as unicast 
route injector with flow spec is sufficient. The DDoS attack to a 
particular destination may have been detected just by your peer and it 
is WRONG to mandate full AS_PATH match.

That would mean that flow-spec filter would need to be injected by the 
target and would consume bandwith of all transit ASes in the AS_PATH. 
This is wrong.

I admit we did not consider RS @ IX when writing section 6.

R.



From internet-drafts@ietf.org  Fri May 18 13:49:13 2012
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A New Internet-Draft is available from the on-line Internet-Drafts director=
ies. This draft is a work item of the Inter-Domain Routing Working Group of=
 the IETF.

	Title           : BGP Custom Decision Process
	Author(s)       : Alvaro Retana
                          Russ White
	Filename        : draft-ietf-idr-custom-decision-01.txt
	Pages           : 9
	Date            : 2012-05-18

   The BGP specification defines a Decision Process for installation of
   routes into the Loc-RIB.  This process takes into account an
   extensive series of path attributes, which can be manipulated to
   indicate preference for specific paths.  It is cumbersome (if at all
   possible) for the end user to define policies that will select, after
   partial comparison, a path based on subjective local (domain and/or
   node) criteria.

   This document defines a new Extended Community, called the Cost
   Community, which may be used in tie breaking during the best path
   selection process.  The end result is a local custom decision
   process.


A URL for this Internet-Draft is:
http://www.ietf.org/internet-drafts/draft-ietf-idr-custom-decision-01.txt

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

This Internet-Draft can be retrieved at:
ftp://ftp.ietf.org/internet-drafts/draft-ietf-idr-custom-decision-01.txt

The IETF datatracker page for this Internet-Draft is:
https://datatracker.ietf.org/doc/draft-ietf-idr-custom-decision/


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A New Internet-Draft is available from the on-line Internet-Drafts director=
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	Title           : Assigned BGP extended communities
	Author(s)       : Bruno Decraene
                          Pierre Francois
	Filename        : draft-ietf-idr-reserved-extended-communities-03.txt
	Pages           : 6
	Date            : 2012-05-21

   This document defines an IANA registry in order to assign non-
   transitive extended communities from.  These are similar to the
   existing well-known BGP communities defined in RFC 1997 but provide a
   control over inter-AS community advertisement as, per RFC RFC 4360,
   they are not transitive across Autonomous System boundaries.

   For that purpose, this document defines the use of the reserved
   Autonomous System number 0.65535 in the non-transitive generic four-
   octet AS specific extended community type.



A URL for this Internet-Draft is:
http://www.ietf.org/internet-drafts/draft-ietf-idr-reserved-extended-commun=
ities-03.txt

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

This Internet-Draft can be retrieved at:
ftp://ftp.ietf.org/internet-drafts/draft-ietf-idr-reserved-extended-communi=
ties-03.txt

The IETF datatracker page for this Internet-Draft is:
https://datatracker.ietf.org/doc/draft-ietf-idr-reserved-extended-communiti=
es/


From bruno.decraene@orange.com  Mon May 21 03:23:44 2012
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From: <bruno.decraene@orange.com>
To: "idr@ietf.org" <idr@ietf.org>, Jeffrey Haas <jhaas@pfrc.org>
Thread-Topic: [Idr] I-D Action: draft-ietf-idr-reserved-extended-communities-03.txt
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Hi all,

As previously discussed on the list, version 03 introduces the following ma=
in changes:

>	Changes -03=09
>=09=09=09=09
>			o Use of AS number 0.65535 (0x0000FFFF) instead of AS 0. This is=09
>			better aligned with RFC 1997 which also uses AS 65535.=09
>=09=09=09=09
>			o Remove the transitive flavor of assigned extended communities.=09
>			RFC 1997 well-known standard communities to be used instead.

Diff2: http://tools.ietf.org/rfcdiff?url2=3Ddraft-ietf-idr-reserved-extende=
d-communities-03.txt

Regards,
Bruno

>-----Original Message-----
>From: idr-bounces@ietf.org [mailto:idr-bounces@ietf.org] On Behalf Of inte=
rnet-
>drafts@ietf.org
>Sent: Monday, May 21, 2012 12:17 PM
>To: i-d-announce@ietf.org
>Cc: idr@ietf.org
>Subject: [Idr] I-D Action: draft-ietf-idr-reserved-extended-communities-03=
.txt
>
>
>A New Internet-Draft is available from the on-line Internet-Drafts directo=
ries.
>This draft is a work item of the Inter-Domain Routing Working Group of the
>IETF.
>
>	Title           : Assigned BGP extended communities
>	Author(s)       : Bruno Decraene
>                          Pierre Francois
>	Filename        : draft-ietf-idr-reserved-extended-communities-03.txt
>	Pages           : 6
>	Date            : 2012-05-21
>
>   This document defines an IANA registry in order to assign non-
>   transitive extended communities from.  These are similar to the
>   existing well-known BGP communities defined in RFC 1997 but provide a
>   control over inter-AS community advertisement as, per RFC RFC 4360,
>   they are not transitive across Autonomous System boundaries.
>
>   For that purpose, this document defines the use of the reserved
>   Autonomous System number 0.65535 in the non-transitive generic four-
>   octet AS specific extended community type.
>
>
>
>A URL for this Internet-Draft is:
>http://www.ietf.org/internet-drafts/draft-ietf-idr-reserved-extended-
>communities-03.txt
>
>Internet-Drafts are also available by anonymous FTP at:
>ftp://ftp.ietf.org/internet-drafts/
>
>This Internet-Draft can be retrieved at:
>ftp://ftp.ietf.org/internet-drafts/draft-ietf-idr-reserved-extended-
>communities-03.txt
>
>The IETF datatracker page for this Internet-Draft is:
>https://datatracker.ietf.org/doc/draft-ietf-idr-reserved-extended-communit=
ies/
>
>_______________________________________________
>Idr mailing list
>Idr@ietf.org
>https://www.ietf.org/mailman/listinfo/idr

___________________________________________________________________________=
______________________________________________

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From bruno.decraene@orange.com  Mon May 21 03:30:42 2012
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From: <bruno.decraene@orange.com>
To: Jeffrey Haas <jhaas@pfrc.org>
Thread-Topic: [Idr] draft-ietf-idr-reserved-extended-communities
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Subject: Re: [Idr] draft-ietf-idr-reserved-extended-communities
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Jeff,

Many thanks for your review of the draft and your comments.

In short, I agree with you and I have updated the draft as per your comment=
s.
I believe the new version (03) should address your comments. If this not th=
e case, comments are welcomed.

Thanks,
Best regards,
Bruno

>From: Jeffrey Haas [mailto:jhaas@pfrc.org] >Sent: Sunday, March 11, 2012 8=
:23 PM
>
>Bruno,
>
>On Wed, Feb 22, 2012 at 11:05:59AM +0000, bruno.decraene@orange.com wrote:
>> As a reminder, draft-ietf-idr-reserved-extended-communities currently
>proposes to use the AS number O to get a global space of "generic four-oct=
et AS
>specific" extended community (as defined in draft-ietf-idr-as4octet-extcom=
m-
>generic-subtype) in order to be able to get IANA assigned extended communi=
ties
>values from. (i.e. the equivalent of formerly "well known" RFC 1997
>communities).
>>
>> Following some discussion on draft-ietf-idr-as0, another option is to us=
e AS
>number 0x0000FFFF instead of AS 0. This seems also more in line with RFC 1=
997
>which use the same AS number (0xFFFF) for the same purpose (IANA assigned
>communities).
>
>I think using AS 0.65535 (as-dot notation) is probably reasonable given the
>semantics you are looking for.
>
>After spending some additional time thinking about your draft, I believe
>that the primary desired behavior is to add the ability to create
>non-transitive well-known communities.  Since transitive well-known
>communities are easiest (and most backward-compatible at the moment) to
>express as RFC 1997 4-byte communities I would make the following
>suggestion:
>
>- Recommend that IANA set aside the 0.65535 4-byte AS name space using
>  draft-ietf-idr-as4octet-extcomm-generic-subtype.
>- Recommend that only non-transitive types are registered in the above
>  registry.
>- Recommend that when a transitive well-known community is registered in t=
he
>  IANA RFC 1997 community that, when appropriate, a non-transitive version
>  of the community be made similarly available in the new registry.
>
>The above captures the spirit of backward compatibility in
>draft-ietf-idr-as4octet-extcomm-generic-subtype:
>
>:   Therefore, for backward compatibility with existing deployments and
>:   to avoid inconsistencies between standard communities and 4-octet
>:   extended communities, Autonomous Systems that use 2-octet Autonomous
>:   System numbers SHOULD use standard 2-octet communities as defined in
>:   RFC1997 rather than the 4-octet AS specific extended community as
>:   defined in this document.
>
>-- Jeff (not officially speaking for the other as4octet authors, but
>probably capturing the spirit of our discussion)

___________________________________________________________________________=
______________________________________________

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Subject: [Idr] I-D Action: draft-ietf-idr-reserved-extended-communities-03.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 Inter-Domain Routing Working Group of the IETF.

	Title           : Assigned BGP extended communities
	Author(s)       : Bruno Decraene
                          Pierre Francois
	Filename        : draft-ietf-idr-reserved-extended-communities-03.txt
	Pages           : 6
	Date            : 2012-05-21

   This document defines an IANA registry in order to assign non-
   transitive extended communities from.  These are similar to the
   existing well-known BGP communities defined in RFC 1997 but provide a
   control over inter-AS community advertisement as, per RFC RFC 4360,
   they are not transitive across Autonomous System boundaries.

   For that purpose, this document defines the use of the reserved
   Autonomous System number 0.65535 in the non-transitive generic four-
   octet AS specific extended community type.



A URL for this Internet-Draft is:
http://www.ietf.org/internet-drafts/draft-ietf-idr-reserved-extended-communities-03.txt

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

This Internet-Draft can be retrieved at:
ftp://ftp.ietf.org/internet-drafts/draft-ietf-idr-reserved-extended-communities-03.txt

The IETF datatracker page for this Internet-Draft is:
https://datatracker.ietf.org/doc/draft-ietf-idr-reserved-extended-communities/

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A New Internet-Draft is available from the on-line Internet-Drafts director=
ies. This draft is a work item of the Inter-Domain Routing Working Group of=
 the IETF.

	Title           : Codification of AS 0 processing.
	Author(s)       : Warren Kumari
                          Randy Bush
                          Heather Schiller
                          Keyur Patel
	Filename        : draft-ietf-idr-as0-05.txt
	Pages           : 7
	Date            : 2012-05-22

   This document updates RFC 4271 and proscribes the use of AS 0 in BGP
   OPEN and AS_PATH / AS4_PATH BGP attribute.


A URL for this Internet-Draft is:
http://www.ietf.org/internet-drafts/draft-ietf-idr-as0-05.txt

Internet-Drafts are also available by anonymous FTP at:
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This Internet-Draft can be retrieved at:
ftp://ftp.ietf.org/internet-drafts/draft-ietf-idr-as0-05.txt

The IETF datatracker page for this Internet-Draft is:
https://datatracker.ietf.org/doc/draft-ietf-idr-as0/


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Subject: [Idr] I-D Action: draft-ietf-idr-add-paths-guidelines-03.txt
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A New Internet-Draft is available from the on-line Internet-Drafts director=
ies. This draft is a work item of the Inter-Domain Routing Working Group of=
 the IETF.

	Title           : Best Practices for Advertisement of Multiple Paths in IB=
GP
	Author(s)       : Jim Uttaro
                          Virginie Van den Schrieck
                          Pierre Francois
                          Roberto Fragassi
                          Adam Simpson
                          Pradosh Mohapatra
	Filename        : draft-ietf-idr-add-paths-guidelines-03.txt
	Pages           : 23
	Date            : 2012-05-27

   Add-Paths is a BGP enhancement that allows a BGP router to advertise
   multiple distinct paths for the same prefix/NLRI. This provides a
   number of potential benefits, including reduced routing churn, faster
   convergence and better loadsharing.

   This document provides recommendations to implementers of Add-Paths
   so that network operators have the tools needed to address their
   specific applications and to manage the scalability impact of Add-
   Paths. A router implementing Add-Paths may learn many paths for a
   prefix and must decide which of these to advertise to peers. This
   document analyses different algorithms for making this selection and
   provides recommendations based on the target application.


A URL for this Internet-Draft is:
http://www.ietf.org/internet-drafts/draft-ietf-idr-add-paths-guidelines-03.=
txt

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xt

The IETF datatracker page for this Internet-Draft is:
https://datatracker.ietf.org/doc/draft-ietf-idr-add-paths-guidelines/


From jgs@juniper.net  Tue May 29 11:25:22 2012
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Subject: [Idr] BGPSEC proposal to drop AS_PATH [was: Fwd: [sidr] request for agenda items for interim meeting 6 Jun]
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IDR folks,

BGPSEC (in the SIDR WG) includes a path attribute, =
BGPSEC_Path_Signatures, that substantially overlaps the semantics of =
AS_PATH. For reasons discussed in the forwarded note below, it proposes =
that updates carrying BGPSEC_Path_Signatures should NOT carry AS_PATH.=20=


Since this would represent a fairly major change to the protocol, I =
wanted to make sure those not following SIDR were aware of it. Please =
cross-post any comments to sidr@ietf.org.

(See http://tools.ietf.org/html/ietf-sidr-bgpsec-protocol-03 Section 3.)

--John

Begin forwarded message:

> From: "John G. Scudder" <jgs@juniper.net>
> Subject: Re: [sidr] request for agenda items for interim meeting 6 Jun
> Date: May 29, 2012 2:21:33 PM EDT
> To: Matt Lepinski <mlepinski@bbn.com>
> Cc: "sidr@ietf.org list" <sidr@ietf.org>
>=20
> On May 22, 2012, at 5:46 PM, Matt Lepinski wrote:
>=20
>> Other than confeds are there any other potentially open issues =
related to the removal of AS_Path?
>=20
> (I think this just recapitulates what I said at the interim, but maybe =
it's worth saying again for the list.)
>=20
> Philosophically, the thing that makes me worry the most is that we're =
cutting out one of BGP's fundamental elements and replacing it with one =
which provides only a subset of its semantics. Specific things missing =
include:
>=20
> - Confederations. But we are discussing ways to fix this.
> - Extensibility to include new segment types. In principle this is a =
fairly serious omission, but one can argue that new segment types can't =
be introduced in practice, since existing implementations will treat =
them as fatal errors.
>=20
> And actually, that's it for my list of specifics. I think we can check =
off the "done, in principle" box for confeds. So the remaining issue is =
extensibility. One may or may not find the "extensibility doesn't work =
anyway" argument compelling, I'm not entirely sure *I* do. In any case, =
I think this deserves a good airing before we commit.
>=20
> The other issue is one Shane already brought up on this thread -- the =
fact that some of the more egregious AS_PATH editing hacks that exist in =
the wild may not be supportable in the AS_PATH-less new world order. =
(Many of the less egregious ones seem to be OK with appropriate pcount =
gyrations.) The pros and cons are a bit slippery here since even if we =
continue to carry AS_PATH, if the BGPSEC_Path_Signatures attribute can't =
represent the semantics of what's in that AS_PATH, then validation will =
fail. But at least there's scope for a network operator on the receiving =
end to tolerate the validation failure and use the route anyway, if =
desired. In the case where there's no AS_PATH, the data are just gone =
with no chance for appeal.=20
>=20
> It's also worth noting that leaving AS_PATH in would not be without =
cost. In the cases where the content of AS_PATH is isomorphic to that of =
BGPSEC_Path_Signatures, there's no problem -- but in those cases AS_PATH =
clearly could have been left out. In the remaining cases, what is the =
implementation supposed to do? It would be necessary to carefully =
specify. The easiest cop-out would be to say that in all such cases, the =
route fails validation. But I have a feeling that it's not that easy. =
Leaving AS_PATH out reduces that particular maze of twisty passages, =
although it replaces it with another: making sure it was really OK to =
axe AS_PATH to begin with (i.e., the discussion above).
>=20
> I'm going to forward this to IDR to ensure that those who aren't =
following SIDR are aware there's a proposal to phase out AS_PATH in =
favor of a simplified replacement in BGPSEC.=20
>=20
> --John
> _______________________________________________
> sidr mailing list
> sidr@ietf.org
> https://www.ietf.org/mailman/listinfo/sidr


From jgs@juniper.net  Tue May 29 11:35:16 2012
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Subject: Re: [Idr] Adoption of draft-djsmith-bgp-flowspec-oid-01 as IDR WG document
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So far I have seen replies to this from three people. This is not really =
strong evidence of interest on the part of the WG.

The comment period will end on Friday.

--John

On May 16, 2012, at 3:40 PM, John G. Scudder wrote:

> Folks,
>=20
> We have received a request from the authors to adopt =
draft-djsmith-bgp-flowspec-oid-01 as an IDR WG document.  Please send =
your comments to the list.  The deadline for comments is June 1, 2012 at =
noon EDT.
>=20
> Thanks,
>=20
> --John


From wim.henderickx@alcatel-lucent.com  Tue May 29 11:38:15 2012
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Thread-Topic: [Idr] Adoption of draft-djsmith-bgp-flowspec-oid-01 as IDR WG document
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Subject: Re: [Idr] Adoption of draft-djsmith-bgp-flowspec-oid-01 as IDR WG	document
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I am ok adopting this as a WG draft.

-----Original Message-----
From: idr-bounces@ietf.org [mailto:idr-bounces@ietf.org] On Behalf Of John =
G. Scudder
Sent: dinsdag 29 mei 2012 20:34
To: idr@ietf.org List
Subject: Re: [Idr] Adoption of draft-djsmith-bgp-flowspec-oid-01 as IDR WG =
document

So far I have seen replies to this from three people. This is not really st=
rong evidence of interest on the part of the WG.

The comment period will end on Friday.

--John

On May 16, 2012, at 3:40 PM, John G. Scudder wrote:

> Folks,
>=20
> We have received a request from the authors to adopt draft-djsmith-bgp-fl=
owspec-oid-01 as an IDR WG document.  Please send your comments to the list=
.  The deadline for comments is June 1, 2012 at noon EDT.
>=20
> Thanks,
>=20
> --John

_______________________________________________
Idr mailing list
Idr@ietf.org
https://www.ietf.org/mailman/listinfo/idr

From jhaas@slice.pfrc.org  Tue May 29 12:09:09 2012
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Subject: Re: [Idr] Adoption of draft-djsmith-bgp-flowspec-oid-01 as IDR WG document
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On Tue, May 29, 2012 at 02:34:20PM -0400, John G. Scudder wrote:
> So far I have seen replies to this from three people. This is not really strong evidence of interest on the part of the WG.
> 
> The comment period will end on Friday.

I thought I had publicly responded in the affirmative.  I support adoption
of this as a WG item.  Additionally, similar work is a pre-requisite for the
geo-distribution draft I presented at the last IETF.

-- Jeff

From jeff.tantsura@ericsson.com  Tue May 29 12:41:37 2012
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From: Jeff Tantsura <jeff.tantsura@ericsson.com>
To: "John G. Scudder" <jgs@juniper.net>, "idr@ietf.org List" <idr@ietf.org>
Date: Tue, 29 May 2012 15:41:28 -0400
Thread-Topic: [Idr] Adoption of draft-djsmith-bgp-flowspec-oid-01 as IDR WG document
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Hi,

I support adoption of draft-djsmith-bgp-flowspec-oid as IDR WG document

Regards,
Jeff
-----Original Message-----
From: idr-bounces@ietf.org [mailto:idr-bounces@ietf.org] On Behalf Of John =
G. Scudder
Sent: Wednesday, May 16, 2012 12:40 PM
To: idr@ietf.org List
Subject: [Idr] Adoption of draft-djsmith-bgp-flowspec-oid-01 as IDR WG docu=
ment

Folks,

We have received a request from the authors to adopt draft-djsmith-bgp-flow=
spec-oid-01 as an IDR WG document.  Please send your comments to the list. =
 The deadline for comments is June 1, 2012 at noon EDT.

Thanks,

--John
_______________________________________________
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From warren@kumari.net  Tue May 29 13:20:33 2012
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Subject: Re: [Idr] Adoption of draft-djsmith-bgp-flowspec-oid-01 as IDR WG	document
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On May 29, 2012, at 3:41 PM, Jeff Tantsura wrote:

> Hi,
>=20
> I support adoption of draft-djsmith-bgp-flowspec-oid as IDR WG =
document

Me too.

This is a fun new game -- John issues a CFA and we all ignore it. After =
the call closes and doesn't carry, we all popup and support it. This all =
adds to the suspense, making for a more entertaining WG :-P

W

>=20
> Regards,
> Jeff
> -----Original Message-----
> From: idr-bounces@ietf.org [mailto:idr-bounces@ietf.org] On Behalf Of =
John G. Scudder
> Sent: Wednesday, May 16, 2012 12:40 PM
> To: idr@ietf.org List
> Subject: [Idr] Adoption of draft-djsmith-bgp-flowspec-oid-01 as IDR WG =
document
>=20
> Folks,
>=20
> We have received a request from the authors to adopt =
draft-djsmith-bgp-flowspec-oid-01 as an IDR WG document.  Please send =
your comments to the list.  The deadline for comments is June 1, 2012 at =
noon EDT.
>=20
> Thanks,
>=20
> --John
> _______________________________________________
> Idr mailing list
> Idr@ietf.org
> https://www.ietf.org/mailman/listinfo/idr
> _______________________________________________
> Idr mailing list
> Idr@ietf.org
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>=20


From jgs@juniper.net  Tue May 29 14:24:10 2012
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Subject: Re: [Idr] [sidr] BGPSEC proposal to drop AS_PATH [was: Fwd: request for agenda items for interim meeting 6 Jun]
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[Once more from proper account, sigh.]

On May 29, 2012, at 2:24 PM, John G. Scudder wrote:

> It's also worth noting that leaving AS_PATH in would not be without =
cost. In the cases where the content of AS_PATH is isomorphic to that of =
BGPSEC_Path_Signatures, there's no problem -- but in those cases AS_PATH =
clearly could have been left out. In the remaining cases, what is the =
implementation supposed to do? It would be necessary to carefully =
specify. The easiest cop-out would be to say that in all such cases, the =
route fails validation. But I have a feeling that it's not that easy. =
Leaving AS_PATH out reduces that particular maze of twisty passages, =
although it replaces it with another: making sure it was really OK to =
axe AS_PATH to begin with (i.e., the discussion above).

In an offline follow-up with Robert Raszuk, he pointed out that when one =
applies a knob that results in an AS_PATH that can't be represented as a =
BGPSEC_Path_Signatures [*] there is a third option, that of downgrading =
from BGPSEC to unsigned BGP. That is to say, you convert the =
BGPSEC_Path_Signatures to an AS_PATH, apply the knob to the AS_PATH, and =
propagate the route with the AS_PATH and not the BGPSEC_Path_Signatures. =
This is functionally equivalent to "in all such cases, the route fails =
validation" but is more straightforward and seems to make a lot of =
sense: everything that can be represented signed, should be. If you =
insist on doing something that can't be signed, you can fall back to =
unsigned BGP and hope for the best.

This leaves me feeling a little more sanguine about the drop-the-AS_PATH =
idea, although I still think some more attention to enumerating what =
knobs will fall by the wayside is advisable.=20

--John

[*] The name of this attribute makes for awkward prose since it has no =
natural singular. How about calling it BGPSEC_Path_Signature instead? Or =
Signed_Path or Signed_AS_Path sans brand name?=

From randy@psg.com  Tue May 29 16:45:42 2012
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Subject: Re: [Idr] [sidr] BGPSEC proposal to drop AS_PATH [was: Fwd: request for	agenda items for interim meeting 6 Jun]
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> This leaves me feeling a little more sanguine about the
> drop-the-AS_PATH idea, although I still think some more attention to
> enumerating what knobs will fall by the wayside is advisable.

as folk keep inventing new knobs, one question would seem to be whether
the knob inventors will understand and accept the trust/threat model
implications of knobs which force downgrade to non-sec.

randy

From jakob.heitz@ericsson.com  Tue May 29 17:01:54 2012
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From: Jakob Heitz <jakob.heitz@ericsson.com>
To: "John G. Scudder" <jgs@bgp.nu>, "sidr@ietf.org list" <sidr@ietf.org>
Date: Tue, 29 May 2012 20:01:42 -0400
Thread-Topic: [sidr] BGPSEC proposal to drop AS_PATH [was: Fwd: request for agenda items for interim meeting 6 Jun]
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Subject: Re: [Idr] [sidr] BGPSEC proposal to drop AS_PATH [was: Fwd: request for	agenda items for interim meeting 6 Jun]
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AS_PATH is used to specify the path that the payload takes.
Signed_AS_PATH is to verify the path that the update message takes.

There is no reason they can not be different. Let the verifying
function take both as input and let it decide based on policy.

An AS could forward an update with a third party nexthop of a third
party AS. The update message does not need to traverse the third
party AS at all, but the payload will. The third party ASN might just
be another ASN that the first party is using: it might be renumbering.
The first party might like to include the third party ASN for
loop detection.

I don't have a specific feature in mind. Just "what if".

On Tuesday, May 29, 2012 2:22 PM, John G. Scudder <> wrote:

> On May 29, 2012, at 2:24 PM, John G. Scudder wrote:
>=20
>> It's also worth noting that leaving AS_PATH in would not be without
>> cost. In the cases where the content of AS_PATH is isomorphic to
>> that of BGPSEC_Path_Signatures, there's no problem -- but in those
>> cases AS_PATH clearly could have been left out. In the remaining
>> cases, what is the implementation supposed to do? It would be
>> necessary to carefully specify. The easiest cop-out would be to say
>> that in all such cases, the route fails validation. But I have a
>> feeling that it's not that easy. Leaving AS_PATH out reduces that
>> particular maze of twisty passages, although it replaces it with
>> another: making sure it was really OK to axe AS_PATH to begin with
>> (i.e., the discussion above).         =20
>=20
> In an offline follow-up with Robert Raszuk, he pointed out that when
> one applies a knob that results in an AS_PATH that can't be
> represented as a BGPSEC_Path_Signatures [*] there is a third option,
> that of downgrading from BGPSEC to unsigned BGP. That is to say, you
> convert the BGPSEC_Path_Signatures to an AS_PATH, apply the knob to
> the AS_PATH, and propagate the route with the AS_PATH and not the
> BGPSEC_Path_Signatures. This is functionally equivalent to "in all
> such cases, the route fails validation" but is more straightforward
> and seems to make a lot of sense: everything that can be represented
> signed, should be. If you insist on doing something that can't be
> signed, you can fall back to unsigned BGP and hope for the best.    =20
>=20
> This leaves me feeling a little more sanguine about the
> drop-the-AS_PATH idea, although I still think some more attention to
> enumerating what knobs will fall by the wayside is advisable. =20
>=20
> --John
>=20
> [*] The name of this attribute makes for awkward prose since it has
> no natural singular. How about calling it BGPSEC_Path_Signature
> instead? Or Signed_Path or Signed_AS_Path sans brand name

--=20
Jakob Heitz.=

From randy@psg.com  Tue May 29 17:29:27 2012
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Subject: Re: [Idr] [sidr] BGPSEC proposal to drop AS_PATH [was: Fwd: request	for	agenda items for interim meeting 6 Jun]
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> AS_PATH is used to specify the path that the payload takes.

really?  i thought it was a routing loop detection mechanism.
it's been a while since folk wrote research papers describing
schemes for routing by AS.

i would phrase it as

AS_PATH specifies the ASs through which the routing announcement has
passed.

> Signed_AS_PATH is to verify the path that the update message takes.

and then this works really nicely.

> There is no reason they can not be different.

and here i thought that detecting that they differ, as an attack, is the
core goal of as-path validation.

randy

From jakob.heitz@ericsson.com  Tue May 29 17:47:44 2012
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From: Jakob Heitz <jakob.heitz@ericsson.com>
To: Randy Bush <randy@psg.com>
Date: Tue, 29 May 2012 20:47:36 -0400
Thread-Topic: [sidr] BGPSEC proposal to drop AS_PATH [was: Fwd: request	for agenda items for interim meeting 6 Jun]
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On Tuesday, May 29, 2012 5:29 PM, Randy Bush <mailto:randy@psg.com> wrote:

>> AS_PATH is used to specify the path that the payload takes.
>=20
> really?  i thought it was a routing loop detection mechanism.
> it's been a while since folk wrote research papers describing
> schemes for routing by AS.
>=20
> i would phrase it as
>=20
> AS_PATH specifies the ASs through which the routing announcement has
> passed.
>=20
>> Signed_AS_PATH is to verify the path that the update message takes.
>=20
> and then this works really nicely.
>=20
>> There is no reason they can not be different.
>=20
> and here i thought that detecting that they differ, as an attack, is
> the core goal of as-path validation.

I thought it was to prevent an AS from
announcing an update that it was not authorised  to.

An entirely different thing.

>=20
> randy

--=20
Jakob Heitz.=

From randy@psg.com  Tue May 29 17:52:07 2012
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Subject: Re: [Idr] [sidr] BGPSEC proposal to drop AS_PATH [was: Fwd: request	for	agenda items for interim meeting 6 Jun]
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>> and here i thought that detecting that they differ, as an attack, is
>> the core goal of as-path validation.
> I thought it was to prevent an AS from announcing an update that it
> was not authorised to.

nope.  that is rpki-based origin validation.  we are now talking about
as-path validation.

from a note to some gov folk:

To be clear, as people keep calling BGP security 'RPKI'

In the current taxonomy, there are three pieces, the RPKI, RPKI-based
origin validation, and then path validation.

RPKI is the X.509 based hierarchy with is congruent with the internet IP
address allocation administration, the IANA, RIRS, ISPs, ...  It is the
substrate on which the next two are based.  It is currently deployed in
four of the five administrative regions, ARIN in North America being the
sad and embarrassing exception.

RPKI-based origin validation uses some of the RPKI data to allow a
router to verify that the autonomous system announcing an IP address
prefix is in fact authorized to do so.  This is not crypto checked so
can be violated.  But it prevents the vast majority of accidental
'hijackings' on the internet today, e.g. the famous Pakastani accidental
announcement of YouTube's address space.  RPKI-based origin validation
is in shipping code from Cisco, and will be shipping by Juniper soon.

Path validation uses the full crypto information of the RPKI to make up
for the embarrassing mistake that, like much of the internet BGP was
designed with no thought to securing the BGP protocol itself from being
gamed/violated.  It allows a receiver of a BGP announcement to formally
cryptographically validate that the originating autonomous system was
truely authorized to announce the IP address prefix, and that the
systems through which the announcement passed were indeed those which
the sender/forwarder at each hop intended.

Sorry to drone on, but these three really need to be differentiated.

randy

From jakob.heitz@ericsson.com  Tue May 29 18:06:02 2012
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From: Jakob Heitz <jakob.heitz@ericsson.com>
To: Randy Bush <randy@psg.com>
Date: Tue, 29 May 2012 21:05:59 -0400
Thread-Topic: [sidr] BGPSEC proposal to drop AS_PATH [was: Fwd: request	for agenda items for interim meeting 6 Jun]
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Subject: Re: [Idr] [sidr] BGPSEC proposal to drop AS_PATH [was: Fwd: request	for	agenda items for interim meeting 6 Jun]
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On Tuesday, May 29, 2012 5:52 PM, Randy Bush <mailto:randy@psg.com> wrote:

>>> and here i thought that detecting that they differ, as an attack, is
>>> the core goal of as-path validation.
>> I thought it was to prevent an AS from announcing an update that it
>> was not authorised to.
>=20
> nope.  that is rpki-based origin validation.  we are now talking about
> as-path validation.
>=20
> from a note to some gov folk:
>=20
> To be clear, as people keep calling BGP security 'RPKI'
>=20
> In the current taxonomy, there are three pieces, the RPKI, RPKI-based
> origin validation, and then path validation.
>=20
> RPKI is the X.509 based hierarchy with is congruent with the internet
> IP address allocation administration, the IANA, RIRS, ISPs, ...  It
> is the substrate on which the next two are based.  It is currently
> deployed in four of the five administrative regions, ARIN in North
> America being the sad and embarrassing exception.
>=20
> RPKI-based origin validation uses some of the RPKI data to allow a
> router to verify that the autonomous system announcing an IP address
> prefix is in fact authorized to do so.  This is not crypto checked so
> can be violated.  But it prevents the vast majority of accidental
> 'hijackings' on the internet today, e.g. the famous Pakastani
> accidental announcement of YouTube's address space.  RPKI-based
> origin validation=20
> is in shipping code from Cisco, and will be shipping by Juniper soon.
>=20
> Path validation uses the full crypto information of the RPKI to make
> up for the embarrassing mistake that, like much of the internet BGP
> was designed with no thought to securing the BGP protocol itself from
> being gamed/violated.  It allows a receiver of a BGP announcement to
> formally cryptographically validate that the originating autonomous
> system was truely authorized to announce the IP address prefix, and
> that the=20
> systems through which the announcement passed were indeed those which
> the sender/forwarder at each hop intended.
>=20
> Sorry to drone on, but these three really need to be differentiated.
>=20
> randy

Apology accepted.
Note, I said "announcing", not "originating".

Here is my view of the difference:

Origin validation does not stop anyone from announcing an update.
It only requires the first AS in that update to be the
owner of the prefix.

Path validation prevents anyone from announcing an update unless
it was sent to them by an authorised AS. And they are authorised,
because it was sent to them by an authorised AS and so on, back
to the authorised originator.

--=20
Jakob Heitz.=

From robert@raszuk.net  Wed May 30 05:01:40 2012
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Subject: Re: [Idr] [sidr] BGPSEC proposal to drop AS_PATH [was: Fwd: request for	agenda items for interim meeting 6 Jun]
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Let's observe that mangling with AS_PATH is usually done for a reason .. 
to achieve reachability to some set of prefixes which otherwise would be 
dropped.

So with this in mind a better question to think about from customer 
perspective is to choose either:

- unsecure but reachable Internet destinations
- secure Internet routing but unreachable destinations

Rgs,
R.

PS. I believe I have a solution to address both sides. Let me write it 
up and share in a week or two.

>> This leaves me feeling a little more sanguine about the
>> drop-the-AS_PATH idea, although I still think some more attention to
>> enumerating what knobs will fall by the wayside is advisable.
>
> as folk keep inventing new knobs, one question would seem to be whether
> the knob inventors will understand and accept the trust/threat model
> implications of knobs which force downgrade to non-sec.
>
> randy
> _______________________________________________
> Idr mailing list
> Idr@ietf.org
> https://www.ietf.org/mailman/listinfo/idr
>
>


From kent@bbn.com  Wed May 30 08:41:20 2012
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Subject: Re: [Idr] [sidr] BGPSEC proposal to drop AS_PATH [was: Fwd: request for	agenda items for interim meeting 6 Jun]
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Randy,

Thanks for the nicely articulated description of these elements of routing
security work in  SIDR.

Steve

From jgs@juniper.net  Wed May 30 13:53:37 2012
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[added IDR to cc]

On May 30, 2012, at 12:10 PM, Murphy, Sandra wrote:

...
> About extensibility - as you say, any new segment type not built into =
implementations would result in fatal errors.  So any new segment type =
would need to be built into implementations before use.  The question =
then becomes - can the signature attributes also be augmented at the =
same time to deal with the new segment types?
...
> So the AS_PATH extensibility could be maintained in the security =
protections - as long as the new extension is "protectable".

OK, as long as it's practical to extend the BGPSEC_Path_Signatures =
attribute. I confess to not having given this much thought but it =
doesn't appear to be as easily extensible as AS_PATH, because the latter =
has a TLV structure and the former doesn't. I guess your answer is that =
since AS_PATH extensions are in practice a big deal, you'll just =
introduce a new, incompatible format of BGPSEC_Path_Signatures to match? =
If this is the plan, BGPSEC_Path_Signatures should include a version =
number, since it would be a little rude to consume another code point =
from the one-byte BGP path attribute code point space for this purpose. =
Also, for generality you'll need to think about whether you want to be =
able to support different subsets of extensions -- this is easy in a =
TLV-encoded attribute but hard if all you've got is a version number. =
(Another answer might be that Additional_info will serve as the =
extensibility placeholder, but if so its length field is too small.)

...
> I am quite sure I don't know the complete list of AS_PATH knobs!

Nor do I, from memory. But we probably should plan to enumerate a list =
of them so that we can categorize them as "we can do this", "this is =
formally an attack and therefore will never be supported", or "other", =
and then iterate on "other".

> But some of those I do know are hacks that would allow attacks as =
well.  The fact that the security protections prohibit the attacks is a =
good thing.  If there's a way to identify good, not evil, uses, then we =
can design for that.  But in cases where there's no real way to =
distinguish the good from the evil, we're in a hard place.  Shoot a hole =
in the protection to allow the hack or prohibit the hack.

Right, and agreed (see "formally an attack" above). But to repeat my =
further point, if the AS_PATH is present (even if not secured): "at =
least there's scope for a network operator on the receiving end to =
tolerate the validation failure and use the route anyway, if desired. In =
the case where there's no AS_PATH, the data are just gone with no chance =
for appeal."

--John=

From kotikalapudi.sriram@nist.gov  Wed May 30 17:02:46 2012
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From: "Sriram, Kotikalapudi" <kotikalapudi.sriram@nist.gov>
To: "John G. Scudder" <jgs@juniper.net>, "Murphy, Sandra" <Sandra.Murphy@sparta.com>
Date: Wed, 30 May 2012 20:02:44 -0400
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>
>Right, and agreed (see "formally an attack" above). But to repeat my further
>point, if the AS_PATH is present (even if not secured): "at least there's scope for a
>network operator on the receiving end to tolerate the validation failure and use
>the route anyway, if desired. In the case where there's no AS_PATH, the data are
>just gone with no chance for appeal."
>

John,

I do not agree that in the event of "validation failure" the route becomes unusable
in BGPSEC as currently specified.
The operator has a choice to consider and select a route as best path (or as add-path)
even if the update failed validation or validation was deferred.
(Note: Validation may not be deferred sometimes due to 
processor overload, or known RPKI staleness, etc.)

You seem to be suggesting that when there is "validation failure",
then "BGPSEC_Path_Signatures" as whole is unusable. 
That is not the case.

"BGPSEC_Path_Signatures" is just a name given to the outer shell of
the BGPSEC update. (BGPSEC need not give the outer shell any name at all.) 
Within it, we have these segments: Secure_Path, Sig_Block, and Additional_Info.
Each of these segments has its own proper semantics.
Even if the Sig_Block were to have an invalid signature, 
the Secure_Path segment is still usable as it provides the AS path info.
If the operator chose an _Invalid_ update for lack of a better choice, 
then it is still the Secure_Path that provides the AS path info,
and also the update SHOULD be signed and propagated to other BGPSEC peers.
Also, if a specific eBGP neighbor is a non-bgpsec speaker, then the selected
BGPSEC update (valid or invalid) is converted to a regular BGP-4 update wherein 
the AS_PATH attribute is constructed from the Secure_Path. 
So validation failure in BGPSEC does not mean that "the data are just gone."

In fact, for clarity sake I would like to suggest that in the spec we consider
Secure_Path, Sig_Block, and Additional_Info as distinct BGPSEC attributes.
(That is to say we should not lump them together as one attribute.)

Sriram   

From jgs@juniper.net  Thu May 31 10:13:14 2012
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Subject: [Idr] Adoption of draft-uttaro-idr-bgp-persistence-01 as IDR WG document
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Folks,

We have received a request from the authors to adopt =
draft-uttaro-idr-bgp-persistence-01 as an IDR WG document.  Please send =
your comments to the list.  The deadline for comments is June 15, 2012 =
at noon EDT.

Thanks,

--John

From jgs@juniper.net  Thu May 31 10:35:35 2012
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On May 30, 2012, at 8:02 PM, Sriram, Kotikalapudi wrote:

>>=20
>> Right, and agreed (see "formally an attack" above). But to repeat my =
further
>> point, if the AS_PATH is present (even if not secured): "at least =
there's scope for a
>> network operator on the receiving end to tolerate the validation =
failure and use
>> the route anyway, if desired. In the case where there's no AS_PATH, =
the data are
>> just gone with no chance for appeal."
>>=20
>=20
> John,
>=20
> I do not agree that in the event of "validation failure" the route =
becomes unusable
> in BGPSEC as currently specified.

That's not what I meant. My point was that a feature may be applied that =
wants to change the AS_PATH in a way that can't be represented in the =
BGPSEC_Path_Signatures. In other words, your later statement:

> the Secure_Path segment is still usable as it provides the AS path =
info.

is not correct in all cases. Likewise, to this statement:

> So validation failure in BGPSEC does not mean that "the data are just =
gone."

My point is not that validation failure causes this. It's that absent =
AS_PATH, a semantically non-representable AS_PATH will be lost if forced =
through BGPSEC_Path_Signatures.

To reiterate, the options to address the case where a feature wants to =
produce output that can't be represented in BGPSEC_Path_Signatures are:

- Don't solve it. Effectively forbid any such feature.
- Carry both AS_PATH and BGPSEC_Path_Signatures in every update. Rules =
for reconciliation would be required.
- Downgrade BGPSEC update to BGP update.=20
- Extend BGPSEC_Path_Signatures format to be able to represent the =
needed feature. (As Sandy noted, this only makes sense insofar as the =
feature isn't formally an attack, so this option is incomplete.)

The validation failure I spoke of is a potential *consequence* of the =
middle two options above, and as you say, the operator can then decide =
what to do.

--John=

From jgs@juniper.net  Thu May 31 10:39:41 2012
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From: "John G. Scudder" <jgs@juniper.net>
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Date: Thu, 31 May 2012 13:37:57 -0400
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To: "idr@ietf.org List" <idr@ietf.org>, "sidr@ietf.org list" <sidr@ietf.org>
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Subject: Re: [Idr] [sidr] BGPSEC proposal to drop AS_PATH [was: Fwd: request for agenda items for interim meeting 6 Jun]
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[Sigh. Again with the right source email address.]

Missed one:

On May 29, 2012, at 2:24 PM, John G. Scudder wrote:

>> Philosophically, the thing that makes me worry the most is that we're =
cutting out one of BGP's fundamental elements and replacing it with one =
which provides only a subset of its semantics. Specific things missing =
include:
>>=20
>> - Confederations. But we are discussing ways to fix this.
>> - Extensibility to include new segment types. In principle this is a =
fairly serious omission, but one can argue that new segment types can't =
be introduced in practice, since existing implementations will treat =
them as fatal errors.

- AS_SETs. SIDR has decided not to support these, and IDR has published =
RFC 6472 / BCP 172 "Recommendation for Not Using AS_SET and =
AS_CONFED_SET in BGP". Nonetheless, they remain part of the protocol and =
have not (yet) been formally deprecated, so I mention them for =
completeness.

--John=

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Thread-Topic: [Idr] Adoption of draft-djsmith-bgp-flowspec-oid-01 as IDR WGdocument
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From: "Shyam Sethuram (shsethur)" <shsethur@cisco.com>
To: "John G. Scudder" <jgs@juniper.net>, <idr@ietf.org>
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Subject: Re: [Idr] Adoption of draft-djsmith-bgp-flowspec-oid-01 as IDR WGdocument
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+Support

thanks--shyam


>-----Original Message-----
>From: idr-bounces@ietf.org [mailto:idr-bounces@ietf.org] On Behalf Of
John G. Scudder
>Sent: Tuesday, May 29, 2012 11:34 AM
>To: idr@ietf.org List
>Subject: Re: [Idr] Adoption of draft-djsmith-bgp-flowspec-oid-01 as IDR
WGdocument
>
>So far I have seen replies to this from three people. This is not
really strong evidence of
>interest on the part of the WG.
>
>The comment period will end on Friday.
>
>--John
>
>On May 16, 2012, at 3:40 PM, John G. Scudder wrote:
>
>> Folks,
>>
>> We have received a request from the authors to adopt
draft-djsmith-bgp-flowspec-oid-01 as
>an IDR WG document.  Please send your comments to the list.  The
deadline for comments
>is June 1, 2012 at noon EDT.
>>
>> Thanks,
>>
>> --John
>
>_______________________________________________
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>Idr@ietf.org
>https://www.ietf.org/mailman/listinfo/idr
