[Idr] Re: FW: New Version Notification for draft-kriswamy-idr-route-type-capability-00.txt
Robert Raszuk <robert@raszuk.net> Wed, 23 October 2024 11:23 UTC
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From: Robert Raszuk <robert@raszuk.net>
Date: Wed, 23 Oct 2024 13:23:08 +0200
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To: Donatas Abraitis <donatas.abraitis@gmail.com>
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CC: "Krishnaswamy Ananthamurthy (kriswamy)" <kriswamy=40cisco.com@dmarc.ietf.org>, "idr@ietf.org" <idr@ietf.org>
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Subject: [Idr] Re: FW: New Version Notification for draft-kriswamy-idr-route-type-capability-00.txt
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It is not as sweet as it looks :) List of route types keeps getting extended in multi route-type AFI/SAFIs .. so you really never know what is supported by the peer unless you know how to operate your network well. I think the proposal is a safety fuse to address not so well operated networks ... Cheers, R. On Wed, Oct 23, 2024 at 12:21 PM Donatas Abraitis < donatas.abraitis@gmail.com> wrote: > What optional route types would be advertised? I mean if an implementation > supports let's say EVPN, LS, etc. does it > include all of them or the _list_ should be configurable? > > On Tue, Oct 22, 2024 at 10:12 PM Krishnaswamy Ananthamurthy (kriswamy) > <kriswamy=40cisco.com@dmarc.ietf.org> wrote: > >> Hi Robert, >> >> Appreciate your quick review and feedback, and the following is the >> response. >> >> >> >> #1 – Will update the text >> >> #2 – Will expand the operation section and will consider your suggestion >> >> #3 – Will discuss with co-authors and respond accordingly. >> >> >> >> Thanks >> >> Krishna >> >> >> >> >> >> *From: *Robert Raszuk <robert@raszuk.net> >> *Date: *Tuesday, October 22, 2024 at 1:59 PM >> *To: *Krishnaswamy Ananthamurthy (kriswamy) <kriswamy@cisco.com> >> *Cc: *idr@ietf.org <idr@ietf.org> >> *Subject: *Re: [Idr] FW: New Version Notification for >> draft-kriswamy-idr-route-type-capability-00.txt >> >> All, >> >> >> >> Actually I have a 3rd comment which appeared after I hit the send button. >> >> >> >> Since you are really doing route type filtering here it seems to me that >> a much better suited mechanism for this would be an ORF message. >> >> >> >> In fact it is also much more flexible - you can freely use it during BGP >> sessions being already established without need for session reset to enable >> reception of new service/new NLRI types. >> >> >> >> A simple extension would be like Dynamic Route-Types support with most of >> the existing cfg/cli/show commands or logging already in place. >> >> >> >> Think about it .... >> >> >> >> Cheers, >> >> Robert >> >> >> >> >> >> On Tue, Oct 22, 2024 at 6:08 PM Robert Raszuk <robert@raszuk.net> wrote: >> >> Hi, >> >> >> >> I have two comments on this draft. >> >> >> >> #1 >> >> >> >> Draft says: >> >> >> >> > This document defines an optional capability exchange of route types >> >> > per AFI/SAFI such that BGP speakers *negotiate* the route types >> >> >> >> Unfortunately BGP capabilities do not negotiate anything in BGP. Please >> search on number of discussions on this point on the list in the past. >> >> >> >> So I recommend you change this into: >> >> >> >> This document defines an optional capability exchange of route types per >> AFI/SAFI such that BGP speakers *signal* the route types >> >> >> >> #2 >> >> >> >> Operational consideration is missing ... >> >> >> >> The scenario where this draft could play a role is that operator enables >> mix of services between two nodes. >> >> >> >> Now this mix of services is not symmetrical. >> >> >> >> Today session does not come up and it is clear there is configuration >> mistake which needs to be corrected. >> >> >> >> With this draft session will happily come up and only "supported" >> services by a peer as expressed in supported route types for a given >> AFI/SAFI peer will be sent. >> >> >> >> How is this helping operator to consistently run the services ? If he >> would not count on exchanging those with the peer it would not be >> configured in the first place. >> >> >> >> Bigger question how would a router signal that only partial of configured >> services operate within say EVPN AF ? >> >> >> >> It seems that it would lead to really weak configuration habits in a >> style - enable all and see what get's exchanged. >> >> >> >> In other words having ability to know what services/route types my peers >> support for a given AFI/SAFI seems cool. But only informationally. >> >> >> >> Using this information for automated service propagation >> suppression/filtering is IMHO much less cool .. if at all a good thing. >> >> >> >> Kind regards, >> >> Robert >> >> >> >> PS. And it may be interesting to see a section on how this may help to >> enable new route types dynamically on the existing running nodes and within >> existing established BGP sessions with many AFI/SAFIs. Of course assumption >> is that running operating systems on those nodes does support it already - >> but new services where not enable at boot time (BGP sessions establishment >> time). >> >> >> >> Where am I going with this PS note ... >> >> >> >> As we are really touching a new territory of signalling embedded route >> types (different NLRI formats) within single AFI/SAFI(s) perhaps this is >> good time to rethink it and write up Dynamic Route-Types proposal which >> could be signalled between nodes not really using BGP Capabilities >> semantics. >> >> >> >> >> >> On Tue, Oct 22, 2024 at 12:58 AM Krishnaswamy Ananthamurthy (kriswamy) >> <kriswamy=40cisco.com@dmarc.ietf.org> wrote: >> >> 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. >> >> >> >> The IETF Secretariat >> >> _______________________________________________ >> Idr mailing list -- idr@ietf.org >> To unsubscribe send an email to idr-leave@ietf.org >> >> _______________________________________________ >> Idr mailing list -- idr@ietf.org >> To unsubscribe send an email to idr-leave@ietf.org >> > > > -- > Donatas >
- [Idr] FW: New Version Notification for draft-kris… Krishnaswamy Ananthamurthy (kriswamy)
- [Idr] Re: FW: New Version Notification for draft-… Robert Raszuk
- [Idr] Re: FW: New Version Notification for draft-… Robert Raszuk
- [Idr] Re: FW: New Version Notification for draft-… Krishnaswamy Ananthamurthy (kriswamy)
- [Idr] Re: FW: New Version Notification for draft-… Donatas Abraitis
- [Idr] Re: FW: New Version Notification for draft-… Robert Raszuk
- [Idr] Re: FW: New Version Notification for draft-… Donatas Abraitis
- [Idr] Re: FW: New Version Notification for draft-… Donatas Abraitis
- [Idr] draft-kriswamy-idr-route-type-capability-00 Jorge Rabadan (Nokia)
- [Idr] Re: draft-kriswamy-idr-route-type-capabilit… Krishnaswamy Ananthamurthy (kriswamy)
- [Idr] Re: draft-kriswamy-idr-route-type-capabilit… Jorge Rabadan (Nokia)
- [Idr] Re: FW: New Version Notification for draft-… Krishnaswamy Ananthamurthy (kriswamy)
- [Idr] Re: FW: New Version Notification for draft-… Robert Raszuk
- [Idr] Re: FW: New Version Notification for draft-… Krishnaswamy Ananthamurthy (kriswamy)
- [Idr] Re: FW: New Version Notification for draft-… Donatas Abraitis
- [Idr] Re: FW: New Version Notification for draft-… Ketan Talaulikar
- [Idr] Re: FW: New Version Notification for draft-… Robert Raszuk
- [Idr] Re: New Version Notification for draft-kris… Jeffrey Haas
- [Idr] Re: New Version Notification for draft-kris… Robert Raszuk
- [Idr] Re: New Version Notification for draft-kris… Jeffrey Haas
- [Idr] Re: New Version Notification for draft-kris… Robert Raszuk
- [Idr] Re: New Version Notification for draft-kris… Jeffrey Haas
- [Idr] Re: New Version Notification for draft-kris… Robert Raszuk
- [Idr] Re: New Version Notification for draft-kris… Jeffrey Haas
- [Idr] Re: New Version Notification for draft-kris… Robert Raszuk
- [Idr] Re: New Version Notification for draft-kris… Jeffrey Haas
- [Idr] Re: New Version Notification for draft-kris… Robert Raszuk