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Cell Relay Retreat>MPLS-OPS Archive>month:2002-Oct> msg00131



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Reg NULL label and Egress Router

  • From: "vignesh03" <vignesh03@indiatimes.com>
  • Date: Tue, 29 Oct 2002 11:58:37 +0530
  • CC: <RickGall1@aol.com>, <mgibson@orchestream.com>
  • Resent-Date: Tue, 29 Oct 2002 02:56:08 -0500
  • To: <mpls-ops@mplsrc.com>
  • X-URL: http://indiatimes.com

Hello all,
    Thanx for all ur help...... I 'll be really happy if i am enlightened on the foll questions...

1.How is the Ingress router and Egress router identified in an MPLS domain.I assume that in an MPLS domain the LSR which recieves a paket first from outside the domain is an Ingress router.How does the packet entering thru this ingress router know how to ask for a label and reach the egress router requesting for it.How is the egress router identified or what is the protocol behind it.
   Also what makes the Ingress ask for a label(DOD ) and what decides that the path shud use unsolicited distribution.

2.Can a hub/switch (which is centrally)connected between 3 LERs in a star nw topology be treated just like a normal LCR.

3.Can I push and pop implicit NULL label?CAn I push a NULL label and then another label(say 2) upon the the pushed
NULL label.Does this make a meaningful label stack.

THanx a lot

Vicky

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