I-D ACTION:draft-delord-jounay-pwe3-ldp-aii-reachability-01.txt

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	Title		: LDP extension for AII reachability
	Author(s)	: S. DeLord
	Filename	: draft-delord-jounay-pwe3-ldp-aii-reachability-01.txt
	Pages		: 10
	Date		: 2008-7-7

The dynamic End-to-End Multisegment pseudowire setup requires PEs to 
   maintain a pseudowire routing table when using FEC129. There is 
   therefore a requirement for automatic Attachment Individual 
   Identifiers discovery. Two mechanisms already exist, a BGP based 
   solution and an IGP based one. Here we define a third solution 
   relying on LDP. It allows for automatic discovery of the Attachment
   Individual Identifiers provsionned on a PE when this node does not run BGP or IGP. The mechanism described here only runs on the 
   T-LDP (Targeted LDP) session between the T-PE and S-PE, but not on 
   any other LDP session which may exist for the tunnels. The T-PE 
   advertises its locally attached AIIs only for the S-PE to build its 
   PW routing table (the S-PE does not propagate this information 
   further via this mechanism).  
   The mechanism described here is intended to complement other 
   existing autodiscovery and routing mechanisms already described 
   with BGP and OSPF.

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