RFC 1195, "Use of OSI IS-IS for routing in TCP/IP and dual environments", December 1990Source of RFC: Legacy
Area Assignment: rtg
Errata ID: 3741
Status: Held for Document Update
Publication Format(s) : TEXT
Reported By: Jeffrey Zhang
Date Reported: 2013-10-01
Held for Document Update by: Adrian Farrel
Date Held: 2013-10-19
Section 5.3.5 says:
5.3.5 Level 2 Link State PDU ... IP Internal Reachability Information -- IP addresses within the routing domain reachable directly via one or more interfaces on this Intermediate system.
It should say:
IP Internal Reachability Information -- IP addresses within the routing domain reachable directly via one or more interfaces on this Intermediate system, or indirectly via level 1 routing. ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Currently, the relevant text in 5.3.2 and 5.3.5 are identical, but the 5.3.5 text should have the above text added.
This would match the following (see the last clause):
5.2 Overview of IP-Specific Information for IS-IS
The "IP Internal Reachability Information" field ...
If included in level 1 LSPs,
this field includes only entries directly reachable by the router
which originates the LSP, via one of its interfaces. If included in
level 2 LSPs, this field includes only entries reachable by the
router which originates the LSP, either via one of its interfaces, or
indirectly via level 1 routing.
I have marked this report as "held for document update" although I do not expect any new revision to RFC 1195. This "correction" is more of a clarification. The "corrected" text can be successfully deduced from the rest of the document such that nobody reading the document in its entirety would be led to make an incorrect and/or non-interoperable implementation.
Furthermore, any clarifications necessary have previously been published in the informational RFCs 3719 and in particular 3787.
However, there is some value in retaining this record for future enquiring minds (and to stop a similar report being raised in the future).