[Idr] Re: draft-kriswamy-idr-route-type-capability-00

"Krishnaswamy Ananthamurthy (kriswamy)" <kriswamy@cisco.com> Mon, 04 November 2024 16:38 UTC

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From: "Krishnaswamy Ananthamurthy (kriswamy)" <kriswamy@cisco.com>
To: "Jorge Rabadan (Nokia)" <jorge.rabadan=40nokia.com@dmarc.ietf.org>, "idr@ietf.org" <idr@ietf.org>
Thread-Topic: draft-kriswamy-idr-route-type-capability-00
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Date: Mon, 04 Nov 2024 16:37:50 +0000
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Subject: [Idr] Re: draft-kriswamy-idr-route-type-capability-00
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Hi Jorge,
                Thanks for your feedback and providing details about the implementations that doesn’t bounce the session. I can update the text accordingly.
Thanks
Krishna


From: Jorge Rabadan (Nokia) <jorge.rabadan=40nokia.com@dmarc.ietf.org>
Date: Monday, November 4, 2024 at 4:31 PM
To: Krishnaswamy Ananthamurthy (kriswamy) <kriswamy@cisco.com>, idr@ietf.org <idr@ietf.org>
Subject: draft-kriswamy-idr-route-type-capability-00
Hi Krishna and authors,

I realized this draft will be presented on Friday, but I won’t be able to make it so here is my question about it.
The document is based on the premise that the BGP session is restarted if a route type is unrecognized by the speaker:

“When a new Route-type is added to EVPN, MVPN and any other address families that support route types, then all routers in the network to be updated to make sure that there is no session reset. Resetting a BGP session is expensive as we have seen from deployments that multiple AFI/SAFI are negotiated between the BGP neighbors and resetting a session will impact the network adversely.”

However, RFC7606 says:

   “A BGP speaker advertising support for such a typed address family
   MUST handle routes with unrecognized NLRI types within that address
   family by discarding them, unless the relevant specification for that
   address family specifies otherwise.”
Specifically, for EVPN route types, I know implementations that do bounce the peer when they receive an unsupported route type, but I also know multiple implementations that follow RFC7606 and discard them (as I think it should be).

The capability might still be useful, but the text about the BGP session restarted does not look correct to me.

Any thoughts about it?

Thanks!
Jorge


From: Krishnaswamy Ananthamurthy (kriswamy) <kriswamy=40cisco.com@dmarc.ietf.org>
Date: Monday, October 21, 2024 at 3:58 PM
To: idr@ietf.org <idr@ietf.org>
Subject: [Idr] FW: New Version Notification for draft-kriswamy-idr-route-type-capability-00.txt

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IDR WG,

We have posted a new draft outlining route type capability to address BGP session reset whenever new route type is added to address families like EVPN.

https://datatracker.ietf.org/doc/html/draft-kriswamy-idr-route-type-capability

Request the WG to review and provide feedback/comments.

Thanks,
Krishna

From: internet-drafts@ietf.org <internet-drafts@ietf.org>
Date: Monday, October 21, 2024 at 5:51 PM
To: Keyur Patel <keyur@arrcus.com>, Krishnaswamy Ananthamurthy (kriswamy) <kriswamy@cisco.com>, Lukas Krattiger (lkrattig) <lkrattig@cisco.com>, Mankamana Mishra (mankamis) <mankamis@cisco.com>
Subject: New Version Notification for draft-kriswamy-idr-route-type-capability-00.txt
A new version of Internet-Draft
draft-kriswamy-idr-route-type-capability-00.txt has been successfully
submitted by Krishnaswamy Ananthamurthy and posted to the
IETF repository.

Name:     draft-kriswamy-idr-route-type-capability
Revision: 00
Title:    BGP Route Type Capability
Date:     2024-10-21
Group:    Individual Submission
Pages:    5
URL:      https://www.ietf.org/archive/id/draft-kriswamy-idr-route-type-capability-00.txt
Status:   https://datatracker.ietf.org/doc/draft-kriswamy-idr-route-type-capability/
HTMLized: https://datatracker.ietf.org/doc/html/draft-kriswamy-idr-route-type-capability


Abstract:

   BGP supports different route types, which defines the encoding of
   Network Layer Reachability Information (NLRI) for a some of the
   Address Family Identifier (AFI)/Subsequent Address Family Identifier
   (SAFI) like Ethernet VPN (EVPN), Multicast VPN(MVPN) and so on.  BGP
   speaker will reset the BGP session if a given route type is not
   supported.  This document defines an Optional Capabilities to
   exchange the route types supported for a given AFI/SAFI such that
   session are not reset.



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