Re: [Idr] I-D Action: draft-ietf-idr-large-community-04.txt
"Jakob Heitz (jheitz)" <jheitz@cisco.com> Tue, 25 October 2016 19:48 UTC
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From: "Jakob Heitz (jheitz)" <jheitz@cisco.com>
To: David Freedman <david.freedman@uk.clara.net>, "idr@ietf.org" <idr@ietf.org>, Jeff Haas <jhaas@juniper.net>
Thread-Topic: [Idr] I-D Action: draft-ietf-idr-large-community-04.txt
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Date: Tue, 25 Oct 2016 19:47:57 +0000
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Subject: Re: [Idr] I-D Action: draft-ietf-idr-large-community-04.txt
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We added that as a result of Jeff Haas's email attached. It actually makes sense. However, if we want to keep parity with https://tools.ietf.org/html/rfc7606#section-7.8 it's no big deal for me. Jeff? Thanks, Jakob. > -----Original Message----- > From: Idr [mailto:idr-bounces@ietf.org] On Behalf Of David Freedman > Sent: Tuesday, October 25, 2016 9:54 AM > To: idr@ietf.org > Subject: Re: [Idr] I-D Action: draft-ietf-idr-large-community-04.txt > > Apologies for the ultra-late-last-minute input, but I was discussing this with Job offlist and we felt it should be > seen by list participants. > > My point was about RFC1997 parity and the length validation. > > " A Large BGP Communities attribute with a length of zero MUST be ignored upon receipt and removed when sending." > > Later wording here has been discussed to be amended (I understand) to: > > " A Large BGP Communities attribute with a length of zero MUST NOT be sent and MUST be ignored upon receipt." > > Well, I wanted to point out, that RFC1997 was of course updated by RFC7606. > > In (7606), the following two comments are made: > > " For all path attributes other than those specified as having an attribute length that may be zero, it SHALL be > considered a syntax error for the attribute to have a length of zero." > > And > > " The error handling of [RFC1997] is revised as follows: The Community attribute SHALL be considered malformed if > its length is not a non-zero multiple of 4" > > So really, if you apply RFC7606 to RFC1997 you have lost parity if you accept a zero length community (even if you > just ignore it). > > My suggestion here is just to drop the passive receive tolerance of the zero length largecomm, since it seems out of > place (even if it is harmless). > and let it be considered malformed and handled by RFC7606. > > Thoughts? > > Dave. > > _______________________________________________ > Idr mailing list > Idr@ietf.org > https://www.ietf.org/mailman/listinfo/idr
--- Begin Message ---On Sep 21, 2016, at 4:31 PM, Randy Bush <randy@psg.com<mailto:randy@psg.com>> wrote: The attribute consists of a set of Large Communities. a bgp update may contain a large community attribute which is composed of zero or more large communities. or one or more if you insist. ack. zero or one? 1 or more. Implementations may prune empty path attributes (and probably should) when the contents are lists. However, I don't believe we should standardize sending 0 of these communities as a form of signaling. That said, in the error handling section, it should note that a length of zero shall not be treated as a malformed route. -- Jeff--- End Message ---
- [Idr] I-D Action: draft-ietf-idr-large-community-… internet-drafts
- Re: [Idr] I-D Action: draft-ietf-idr-large-commun… Job Snijders
- Re: [Idr] I-D Action: draft-ietf-idr-large-commun… Jeffrey Haas
- Re: [Idr] I-D Action: draft-ietf-idr-large-commun… David Freedman
- Re: [Idr] I-D Action: draft-ietf-idr-large-commun… Jakob Heitz (jheitz)
- Re: [Idr] I-D Action: draft-ietf-idr-large-commun… Jeffrey Haas
- Re: [Idr] I-D Action: draft-ietf-idr-large-commun… Job Snijders