[ - RFC Editor (for clutter) ] Dear GROW,
AFAICT, this errata is correct, and should be Verified, but I'd like some confirmation / double-checkin'. Note that there is already a somewhat related errata: https://www.rfc-editor.org/errata_search.php?rfc=6396&rec_status=0 Please let me know by Friday (July 16th) if you disagree with the Errata. W On Tue, Jul 13, 2021 at 9:01 AM RFC Errata System <rfc-edi...@rfc-editor.org> wrote: > > The following errata report has been submitted for RFC6396, > "Multi-Threaded Routing Toolkit (MRT) Routing Information Export Format". > > -------------------------------------- > You may review the report below and at: > https://www.rfc-editor.org/errata/eid6640 > > -------------------------------------- > Type: Technical > Reported by: Claudio Jeker <cje...@diehard.n-r-g.com> > > Section: Appendix A > > Original Text > ------------- > | BGP Path Attributes = > > 40 01 01 00 50 02 00 0e 02 03 00 00 fb f0 00 00 > fb ff 00 00 fb f6 80 0e 2b 00 02 01 20 20 01 0d > b8 00 0d 00 ff 00 00 00 00 00 00 01 87 fe 80 00 > 00 00 00 00 00 02 12 f2 ff fe 9f 1b 00 00 00 20 > 20 01 0d b8 > > Figure 19: MRT RIB_IPV6_UNICAST Example > > The contents of the BGP Path Attribute field above are as follows: > > ORIGIN: IGP > ASPATH: 64496 64511 64502 > MP_REACH_NLRI(IPv6 Unicast) > NEXT_HOP: 2001:db8:d:ff::187 > NEXT_HOP: fe80::212:f2ff:fe9f:1b00 > NLRI: 2001:0DB8::/32 > > Figure 20: BGP Path Attribute Contents > > > Corrected Text > -------------- > | BGP Path Attributes = > > 40 01 01 00 50 02 00 0e 02 03 00 00 fb f0 00 00 > fb ff 00 00 fb f6 80 0e 21 20 20 01 0d b8 00 0d > 00 ff 00 00 00 00 00 00 01 87 fe 80 00 00 00 00 > 00 00 02 12 f2 ff fe 9f 1b 00 > > Figure 19: MRT RIB_IPV6_UNICAST Example > > The contents of the BGP Path Attribute field above are as follows: > > ORIGIN: IGP > ASPATH: 64496 64511 64502 > MP_REACH_NLRI(IPv6 Unicast) > NEXT_HOP: 2001:db8:d:ff::187 > NEXT_HOP: fe80::212:f2ff:fe9f:1b00 > > Figure 20: BGP Path Attribute Contents > > > Notes > ----- > The encoding of the MP_REACH_NLRI attribute is not in the form according to > Section 4.3.4. RIB Entries: > > There is one exception to the encoding of BGP attributes for the BGP > MP_REACH_NLRI attribute (BGP Type Code 14) [RFC4760]. Since the AFI, > SAFI, and NLRI information is already encoded in the RIB Entry Header > or RIB_GENERIC Entry Header, only the Next Hop Address Length and > Next Hop Address fields are included. The Reserved field is omitted. > The attribute length is also adjusted to reflect only the length of > the Next Hop Address Length and Next Hop Address fields. > > The example includes a full MP_REACH_NLRI attribute. This is a common issue > with TABLE_DUMP_V2 and parsers need to implement a workaround to support the > broken form. > > One way of solving this is to compare the attribute length of MP_REACH_NLRI > with the first byte of the attribute. > If the value of the first byte is equal to the attribute lenght - 1 then it > is the RFC encoding else assume that a full MP_REACH_NLRI attribute was > dumped in which case the parser needs to skip the first 3 bytes to get to the > nexthop. > > Instructions: > ------------- > This erratum is currently posted as "Reported". If necessary, please > use "Reply All" to discuss whether it should be verified or > rejected. When a decision is reached, the verifying party > can log in to change the status and edit the report, if necessary. > > -------------------------------------- > RFC6396 (draft-ietf-grow-mrt-17) > -------------------------------------- > Title : Multi-Threaded Routing Toolkit (MRT) Routing > Information Export Format > Publication Date : October 2011 > Author(s) : L. Blunk, M. Karir, C. Labovitz > Category : PROPOSED STANDARD > Source : Global Routing Operations > Area : Operations and Management > Stream : IETF > Verifying Party : IESG -- The computing scientist’s main challenge is not to get confused by the complexities of his own making. -- E. W. Dijkstra _______________________________________________ GROW mailing list GROW@ietf.org https://www.ietf.org/mailman/listinfo/grow
