[Idr] [Errata Rejected] RFC5492 (3882)
RFC Errata System <rfc-editor@rfc-editor.org> Sun, 02 March 2014 10:42 UTC
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Subject: [Idr] [Errata Rejected] RFC5492 (3882)
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The following errata report has been rejected for RFC5492, "Capabilities Advertisement with BGP-4". -------------------------------------- You may review the report below and at: http://www.rfc-editor.org/errata_search.php?rfc=5492&eid=3882 -------------------------------------- Status: Rejected Type: Technical Reported by: Ramakrishna DTV <ramakrishnadtv@infosys.com> Date Reported: 2014-02-05 Rejected by: Stewart Bryant (IESG) Section: 3 Original Text ------------- " A BGP speaker determines that its peer doesn't support capabilities advertisement if, in response to an OPEN message that carries the Capabilities Optional Parameter, the speaker receives a NOTIFICATION message with the Error Subcode set to Unsupported Optional Parameter. (This is a consequence of the base BGP-4 specification [RFC4271] and not a new requirement.) In this case, the speaker SHOULD attempt to re-establish a BGP connection with the peer without sending to the peer the Capabilities Optional Parameter." Corrected Text -------------- " A BGP speaker determines that its peer doesn't support capabilities advertisement if, in response to an OPEN message that carries the Capabilities Optional Parameter, the speaker receives a NOTIFICATION message with the Error Subcode set to Unsupported Optional Parameter. (This is a consequence of the base BGP-4 specification [RFC4271] and not a new requirement.) The next actions depends on the BGP speaker that received the NOTIFICATION. The speaker may intend to re-establish a BGP connection with the peer. In this case, the speaker SHOULD attempt to re-establish a BGP connection with the peer without sending to the peer the Capabilities Optional Parameter. On the other hand, the speaker may not intend to re-establish peering. For example, a BGP speaker may not intend to re-establish peering if it established peering to exchange IPv6 routes and determines that its peer does not support capabilities advertisement. The decision to re-establish the peering is local to the speaker." Notes ----- Notes: As explained above, it does not always make sense to re-establish peering when the peer does not support capabilities advertisement. Indeed, in a very similar scenario, this RFC itself suggests the proposed behavior. Consider the following text in Section 3: " If a BGP speaker that supports a certain capability determines that its peer doesn't support this capability, the speaker MAY send a NOTIFICATION message to the peer and terminate peering (see Section "Extensions to Error Handling" for more details). For example, a BGP speaker may need to terminate peering if it established peering to exchange IPv6 routes and determines that its peer does not support Multiprotocol Extensions for BGP-4 [RFC4760]. The Error Subcode in the NOTIFICATION message is then set to Unsupported Capability. The message MUST contain the capability or capabilities that cause the speaker to send the message. The decision to send the message and terminate the peering is local to the speaker. If terminated, such peering SHOULD NOT be re-established automatically." --VERIFIER NOTES-- This is a technical matter that should be discussed in the WG and if the WG decides that clarification is needed it should be addressed in an RFC. The text referenced above is a SHOULD, and thus an implementation decision. The provision of further guidance to the implementer is outside the scope of the errata process. -------------------------------------- RFC5492 (draft-ietf-idr-rfc3392bis-05) -------------------------------------- Title : Capabilities Advertisement with BGP-4 Publication Date : February 2009 Author(s) : J. Scudder, R. Chandra Category : DRAFT STANDARD Source : Inter-Domain Routing Area : Routing Stream : IETF Verifying Party : IESG
- [Idr] [Technical Errata Reported] RFC5492 (3882) RFC Errata System
- [Idr] [Errata Rejected] RFC5492 (3882) RFC Errata System