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[mpls] One LDP Implementation specific question of receive labelmapping for prefix FECs

  • From: Eric Rosen <erosen@cisco.com>
  • Date: Mon, 10 Apr 2006 14:09:11 -0400
  • Cc: mpls@ietf.org
  • X-IronPort-AV: i="4.04,108,1144036800"; d="scan'208"; a="86118724:sNHT27225812"


> When Ru receives a label mapping for a FEC of type IPv4/v6 prefix from Rd,
> the next hop  for the FEC can be determined after  route lookup. Now here,
> for looking  up the  FEC at Ru  do we  need to do  exact match  or Longest
> prefix match? It is quite possible that the prefix as FEC mapped by Rd may
> be within a supernetted prefix at Ru. 

It's a  little hard  to understand what  you're asking.  By  definition, one
cannot change the FEC in mid-LSP.  If  the FEC is an address prefix, and you
reach a  point where that address prefix  is not in the  routing table, then
the LSP terminates. 



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