POP-TAG interpretation on MPLS

From: Edward S. Desouza (edward_desouza@yahoo.com)
Date: Fri Feb 02 2001 - 06:37:28 EST


Conside the following scenario

       A----------B-----------C

If A Shows the following entry :

Local Outgoing Prefix
tag tag or VC or Tunnel Id
17 Pop tag [T] 100.1.1.30/32

If B shows the following entry :

Local Outgoing Prefix
tag tag or VC or Tunnel Id
17 Pop tag 100.1.1.30/32

The outgoing Tag of A shows that B has asked A to pop
the uppermost tag

However, if you look at B it shows Local tag as 17 .
Local Tag is the tag advertised to its upstream LSR's.
However, A shows that B has asked A to POp the tag .

Is the above interpretation correct ? If yes router B
should have shown some kind of indication in the local
tag saying that to pop the tags in the upstream LSR's
( however, this is not the case ?

How do you correctly interpret the above two outouts
of show mpls forwarding.

Rgds,

=====
Edward S. Desouza
23/24 Manali 5,
Evershine Nagar,
Malad (W),
Bombay 400064.
Tel :9122-8886362

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