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destination address of the IP Header carrying the Path message should be

  • From: David Charlap <David.Charlap@marconi.com>
  • Date: Mon, 17 Dec 2001 18:44:53 -0500
  • CC: mpls@UU.NET

Hong Liao wrote:
> 
> Would you be able to tell me which RFC or draft indicates what the
> destination address of the IP Header carrying the Path message
> should be?

RFC 2205.

The destination of all RSVP messages going downstream should be the
session address (which is the tunnel endpoint address in RSVP-TE).  The
Router Alert option should be set when sending these messages so that
transit routers will intercept and process them.

Note that other drafts (including the hierarchical LSP draft) may change
this behavior.

> For my understanding, for the path msg, the destination address of
> the IP Header carrying the Path message should be the Egress
> address.  (Could it be the next-hop address?).

It could be the next-hop address.

The reason that this is not allowed in RFC 2205 is that the next-hop
address may not be RSVP-capable.  If you would send a Path message
there, it would get ignored.  In MPLS, it is illegal to send an RSVP-TE
message to/through a non-RSVP-TE router, so this is not an issue.

-- David