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AW: Penultimate Hop Popping

  • From: Hummel Heinrich <Heinrich.Hummel@icn.siemens.de>
  • Date: Wed, 31 Jul 2002 16:54:32 +0200
  • Resent-Date: Wed, 31 Jul 2002 12:03:24 -0400
  • To: "'roberto'" <roberto_narvaez@yahoo.com>, Aamer Akhter <aakhter@cisco.com>, mpls-ops@mplsrc.com

There is this fantastic savings due to penultimate label popping: No label look-up at the egress.

And there is this other fantastic savings due to IPv4-Explicit-Null label:
No label consumption from th egress node's label space.
Remember, B.Jensen in Yokohama:" All routers shall learn to handle  the IPv4-Explicit-Null label" !
 
But is all of this worth the effort? And is it fair to blame any switch in case it cannot handle these
top-of-the-art mechanism?

These mechanism will only make sense if there is still an IP-destination address in the packet header
at the egress. They won't make sense in case of VoMPLS,etc...

They are a burden for any reasonable OAM-concept. They are a burden for any other new concept.
At least,they have to be scrutinized whether they jeopardized these two important mechanisms.  

Wouldn't it be better to give up these two concepts at all ?

Heinrich
 





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