RFC Errata
RFC 6325, "Routing Bridges (RBridges): Base Protocol Specification", July 2011
Source of RFC: trill (int)See Also: RFC 6325 w/ inline errata
Errata ID: 3508
Status: Verified
Type: Technical
Publication Format(s) : TEXT
Reported By: Donald E. Eastlake, 3rd
Date Reported: 2013-03-05
Verifier Name: Ralph Droms
Date Verified: 2013-03-09
Section 4.5.1 says:
In other words, the set of potential parents for N, for the tree rooted at R, consists of those that give equally minimal cost paths from N to R and that have distinct IS-IS IDs, based on what is reported in LSPs.
It should say:
In other words, the set of potential parents for N, for the tree rooted at R, consists of those that give equally minimal cost paths from R to N and that have distinct IS-IS IDs, based on what is reported in LSPs.
Notes:
Link costs can be asymmetric. The above erroneous sentence is inconsistent with the rest of 4.5.1 and normal practice. Furthermore, it is important to fix this and resolve the inconsistency because, if all RBridges in a TRILL campus do not compute the same trees, the reverse path forwarding check for multi-destination TRILL Data packet routing can erroneously discard such packets.