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

  • From: "Dutta, Pranjal" <pdutta@riverstonenet.com>
  • Date: Sun, 9 Apr 2006 01:40:40 +0530
  • Thread-Index: AcZbR1+SBsJJsOnuQLCI23Y0E3362g==
  • Thread-Topic: One LDP Implementation specific question of receive labelmapping for prefix FECs

Hi,

               I have a basic confusion on the “Label Mapping Receive Procedure” explained in the appendix of RFC 3036. One step says “Find the FEC next hop”. 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. The reason why I am asking is I guess the implications could be different based on whether LSR is merge capable or non-merge capable.

 

Thanks in advance,

Pranjal

 

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