From: Kasu Venkat Reddy \(kvreddy\) (kvreddy@cisco.com)
Date: Mon Oct 06 2003 - 03:47:40 GMT-3
Hi ,
Ignore my previous mail.Please go through the below explanation
regarding ur query:
-Implicit null lable-lable 3:By default LDP advertises lable 3 (i.e
implicit null lable).This causes the previous router to do PHP.In some
situatios like MPLS QoS (where QoS in IP HDR is different than the one
in EXP field)-it's a problem .
To overcome that we have explicit null lable (i.e lable 0)- we
can configure this with global comand-"mpls ldp explicit-null"
command.With this lable 0 is inserted by the previous router -where ur
exp bits are carried and egress router won't do lable lookup because it
recognises the explicit null lable.
Please let me know if you have any queries.
Thanks & Regards,
Venkat.
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Howard C. Berkowitz
Sent: Monday, October 06, 2003 11:41 AM
To: 'ccielab@groupstudy.com'
Subject: Re: MPLS question - CCIP
Forgive me, but I can't help myself -- everytime I hear the term
Penultimate Hop Popping, it reminds me of a mutant popcorn.
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