Subject: [irs-discuss] central membership computation for mpls VPNs

From: "Kausik Majumdar (kmajumda)" <[email-masked]>
Date: Wed, 10 Oct 2012 15:22:04 +0000

Hi,

I am new in irs alias. I was looking through the draft http://www.ietf.org/id/draft-white-irs-use-case-00.txt to find out some more details on the central membership computation for MPLS VPNs as mentioned in the doc -

   MPLS based VPNs use route target extended communities to express
   membership information.  Every PE router holds incoming BGP NLRI and
   processes them to determine membership and then import the NLRI into
   the appropriate MPLS/VPN routing tables.  This consumes resources,
   both memory and compute on each of the PE devices.

   An alternative approach is to monitor routing updates on every PE
   from the attached CEs and then compute membership in a central
   manner.  Once computed the routes are pushed to the VPN RIBs of the
   participating PEs.

Are we talking about exporting the route updates from each PEs to a central server out of hw devices and compute BGP membership centrally and then downloading the selective/optimized routes to the respective PEs ? Can someone point me some details on how to compute membership in a central manner.

Thanks in advance,
Kausik