The MPLS WG Archive

[Mark Duffy <mduffy@quarrytech.com>]

>         RFC3036 (LDP specification) is advancing to draft standard.
>
>         As part of this process, it is necessary to compile a list of
>changes/clarifications to the rfc, based on the experience gained with the
>protocol.
>
>         Please send me errors/changes/clarifications that you know about,
>so that they can be taken into account in the revised document. Please
>send your comments by September 6, either directly to me or to the list.


Hi Ina,  I have 2 items:

1.  It would be nice to fold the content of 
draft-ietf-mpls-ldp-mtu-extensions-02.txt into the main LDP standard document.

2.  Re LDP discovery (RFC 3036 section 2.4):  Two types of peer discovery 
are described: Basic and Extended.  Basic as described will work on 
broadcast and point-point media but not in general on NBMA media (e.g. 
non-LC-ATM when used in a multipoint mode).

Extended can work on NBMA but its semantics are quite different than Basic: 
it allows "discovery" of peers that are more than 1 hop away, and it does 
not bind the Hello adjacency to a particular interface.  Both of these 
differences can be undesirable in a context where one is looking to use LDP 
to distribute outer labels with adjacent peers on a non-LC NBMA 
network.  Extended discovery appears to be primarily intended for 
distributing "inner" labels with non-adjacent peers.

I think the successor to 3036 should either point out that basic discovery 
on NBMA is not provided for, or it should specify a mechanism semantically 
similar to basic discovery (1 hop limit, bind the hello adjacency to an 
interface) except using preconfigured neighbor addresses.

Thanks, Mark


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