The MPLS WG Archive

[David Charlap <David.Charlap@marconi.com>]

Pietro Tou wrote:
> 
> we have a question: how can we force RSVP to tear down an LSP from
> an intermediate node?

You can't.  It can send a PathErr to the ingress node.  Depending on the
kind of error you send, the ingress node should respond by tearing the
LSP.

> We thought about triggering a Resv Err message from the
> intermediate node to the destination node of the LPS to be torn
> down.

ResvErr won't help, because the egress node is not the node that must do
the actual tear.

> In fact, Resv Error message is used to notify preemption
> (according to RFC), but how can the message be sent?

ResvErr is used for many things.

And preemption should cause _both_ a PathErr and ResvErr to be
generated.

> Is there a way to make the "administrative preemption"?
> RAPI calls seem to not cover this request, because all error
> messages seem to be managed only internally in the RSVP daemon.

If there isn't an error code/value that describes exactly what you want,
pick one that comes close.  If you want to define a new one, write a
draft and submit it here for us to discuss.

-- David