I-D ACTION:draft-delord-jounay-pwe3-ldp-aii-reachability-00.txt

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	Title		: LDP extension for AII reachability 
	Author(s)	: S. DeLord, et al.
	Filename	: draft-delord-jounay-pwe3-ldp-aii-reachability-00.txt
	Pages		: 10
	Date		: 2008-1-15

   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 when a PE does not 
   run BGP or IGP. The mechanism described here only runs on the 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 and interwork 
   with other existing autodiscovery and routing mechanisms already 
   described with BGP and OSPF. 

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