RFC Errata
RFC 5340, "OSPF for IPv6", July 2008
Note: This RFC has been updated by RFC 6845, RFC 6860, RFC 7503, RFC 8362, RFC 9454
Source of RFC: ospf (rtg)See Also: RFC 5340 w/ inline errata
Errata ID: 2078
Status: Verified
Type: Technical
Publication Format(s) : TEXT
Reported By: Acee Lindem
Date Reported: 2010-03-17
Verifier Name: Stewart Bryant
Date Verified: 2013-01-07
Section 4.8.1 says:
o In Step 2, when a router Vertex V has just been added to the shortest-path tree, there may be multiple LSAs associated with the router. All router-LSAs with the Advertising Router set to V's OSPF Router ID MUST be processed as an aggregate, treating them as fragments of a single large router-LSA. The Options field and the Coltun, et al. Standards Track [Page 45] ^L RFC 5340 OSPF for IPv6 July 2008 router type bits (bits Nt, V, E, and B) should always be taken from the router-LSA with the smallest Link State ID. o Step 2a is not needed in IPv6, as there are no longer stub network links in router-LSAs. o In Step 2b, if W is a router and the router-LSA V6-bit or R-bit is not set in the LSA options, the transit link W is ignored and V's next link is examined.
It should say:
o In Step 2, when a router Vertex V other than the root (which is the router doing the calculation) has just been added to the shortest-path tree and the router-LSA R-bit is not set in the LSA options, Vertex V's links are ignored and the next vertex on the candidate list should be examined as described in Step 3. Coltun, et al. Standards Track [Page 45] ^L RFC 5340 OSPF for IPv6 July 2008 o Also In Step 2, when a router Vertex V has just been added to the shortest-path tree, there may be multiple LSAs associated with the router. All router-LSAs with the Advertising Router set to V's OSPF Router ID MUST be processed as an aggregate, treating them as fragments of a single large router-LSA. The Options field and the router type bits (bits Nt, V, E, and B) should always be taken from the router-LSA with the smallest Link State ID. o Step 2a is not needed in IPv6, as there are no longer stub network links in router-LSAs. o In Step 2b, if W is a router and the router-LSA V6-bit is not set in the LSA options, the transit link to W is ignored and V's next link is examined.
Notes:
This change corrects errata 2046 described below:
This change reflects the fact that the R-bit and the V6-bit should not be handled identically. The R-bit allows the router to participate in the IPv6 unicast topology but does not allow transit traffic. The V6-bit doesn't allow either. This problem was pointed out by Balaji Ganesh.
Michael Barnes brought up the fact that the R-Bit should be ignored in the Router-LSA for the calculating router. This errata fixes this omission in the first paragraph of the corrected text.