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Cell Relay Retreat>MPLS WG Archive>month:2002-Apr> msg00161



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PHP

  • From: Eric Rosen <erosen@cisco.com>
  • Date: Thu, 18 Apr 2002 16:00:48 -0400
  • cc: David.Charlap@marconi.com, mpls@UU.NET
  • User-Agent: EMH/1.14.1 SEMI/1.14.3 (Ushinoya) FLIM/1.14.3(Unebigoryōmae) APEL/10.3 Emacs/21.2(sparc-sun-solaris2.6) MULE/5.0 (SAKAKI)


Neil> in the martini-trans  ID I believe only LDP  is allowed for signalling
Neil> XoverMPLS LSPs.  If so, then how  can we signal the payload 'X' of the
Neil> LSP for such XoverMPLS cases? 

Martini signaling (using LDP) does signal the X, it's the VC type (i.e. it's
part of the FEC).  

But the  fact that a particular Martini  LSP is carrying protocol  X is only
known at the two endpoints of that  LSP.  An RSVP-TE tunnel whose head is at
some arbitrary place in the network will not know this. 

Neil> I always assumed that the  'multiprotocol' aspects would be taken care
Neil> of by label semantics in lieu of no PID field in the MPLS header. 

Yes, when a packet is within a  tunnel, you may not be able to determine the
payload type by  examining the header.  If it is a  Martini packet, you need
to get to  the node that assigned the bottom label  before you can determine
the payload type.

  • References:
    • PHP
      • From: neil.2.harrison@bt.com