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Cell Relay Retreat>MPLS WG Archive>month:2000-Oct> msg00153



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bug in draft-ietf-mpls-label-encaps-08

  • From: Eric Rosen <erosen@cisco.com>
  • Date: Mon, 16 Oct 2000 13:07:54 -0400
  • cc: "'mpls@uu.net'" <mpls@UU.NET>, "'tappan@cisco.com'" <tappan@cisco.com>, "'yakov@cisco.com'" <yakov@cisco.com>
  • User-Agent: EMH/1.10.0 WEMI/1.13.2 (Mochimune) FLIM/1.12.1(Nishinokyō) Emacs/20.6 (sparc-sun-solaris2.5.1)MULE/4.0 (HANANOEN)


Puneet> My understanding was  that when a LSR got a label  3 from the egress
Puneet> LSR during signaling, if the LSR was  able to do a pop then it would
Puneet> perform  a penultimate  hop pop  otherwise  it would  just swap  the
Puneet> incoming label  with label 0  and then the  egress LSR would  do the
Puneet> actual pop.  

I don't think  this understanding accords with section  4.1.5 of draft-ietf-
mpls-arch-07.txt:

        "... a  binding of Implicit NULL may  be distributed only
        to LSRs which can support that function."