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-
- CURRENT_MEETING_REPORT_
-
- Reported by Ross Callon/Wellfleet Communications
-
- Minutes of the IS-IS for IP Internets Working Group (ISIS)
-
- Ross Callon is resigning as working group co-chair. Tentatively
- (subject to management approval), Doug Montgomery will replace him.
- Chris Gunner will continue as co-chair.
-
-
- Document Status
-
- Doug presented the documents related to pushing ``Use of OSI IS-IS for
- Routing in TCP/IP and Multi-Protocol Environments''
- (draft-ietf-isis-tcpip), referred to as ``I.IS-IS'' in these minutes, to
- Draft Standard.
-
- It is suggested that the MIB, ``Integrated IS-IS Management Information
- Base'' (draft-ietf-isis-mib), go to Proposed Standard, and I.IS-IS
- (``son of RFC 1195'') go to Draft Standard. The protocol experience
- document, ``Experience with the Integrated ISIS Protocol''
- (draft-ietf-isis-opexp), and the protocol analysis document,
- ``Integrated ISIS Protocol Analysis'' (draft-ietf-isis-prot-anal), need
- to be issued as Informational RFCs. An applicability statement is also
- needed.
-
- The status of the IS-IS/IDRP-BGP interaction is unknown. This should be
- published as an Internet-Draft and/or RFC.
-
-
- Changes to I.IS-IS
-
- There have been some changes to I.IS-IS since last time, mostly
- clarifications resulting from testing. All changes will interoperate
- with implementations based on the existing specification. Some of these
- changes result in changes to the base ISO specification. These will be
- sent to ISO, and will also become a normative part of the I.IS-IS
- specification.
-
-
- Precedence of ES-IS Information Versus IS-IS Information
-
- There could be cases where there is an adjacency learned from ES-IS
- (corresponding to a subnet with a high metric), and also a lower metric
- path learned from IS-IS. In this case, you should go with the lowest
- cost path. Some implementations do this the other way currently, and/or
- provide a knob to allow folks to control this.
-
- The same issue occurs with IP routes. The same solution should be used.
- This is already described in the I.IS-IS specification (although there
- is the option of having a configuration option to override the metrics).
-
-
-
- Changes to the Configuration Options
-
- There are a couple of changes to the configuration options in the MIB:
- (1) reachable address prefixes to include the NET; (2) ES polling timers
- (ES-IS Configuration Timer option)---allow user to turn off the rapid
- polling option (ageing only).
-
- Padding in IS-IS Hellos can be turned off (this is particularly
- important for low bandwidth and high cost links). Also, you must not
- discard a Hello packet just because the neighbor uses a different pad
- size.
-
-
-
- Uses of Area Addresses
-
- The relationship between the configured area addresses and the computed
- area addresses is confusing to some implementors and users. The
- configured area addresses should be used in computing end system
- adjacencies. This should be a transient problem and/or gross
- configuration error, and therefore should not happen much. The group
- discussed whether to use the union of computed and configured, or just
- computed. It seems that using configured is broken. This will be
- resolved on the mailing list.
-
-
-
- Routing Through Overloaded ISs
-
- Implementations are not currently consistent, i.e., the existing text is
- in fact correct, but has been misinterpreted. The text therefore has
- been clarified to emphasize that the goal is to be able to reach the
- overloaded IS, but not other end systems ``after'' the overloaded IS.
-
-
-
- Designated IS TOS Reporting
-
- DISs currently only report the TOSs that they themselves support when
- generating pseudonode LSPs (reporting end nodes). They should report
- all TOSs. Clarifying text has been added (some existing implementations
- have already fixed this).
-
-
- Interfaces to Subnets Where You Are Not Running IS-IS
-
- Clearly you want to be able to reach such subnets (even if you don't run
- IS-IS on it). Clarifying text has been added.
-
-
- Conclusion
-
- Given fixes to the one minor issue discussed above, the overwhelming
- working group consensus is that I.IS-IS is ready to go to Draft Standard
- and the MIB to Proposed Standard. Any significant additional features
- would then be added to a future version of the standard.
-
-