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PIM snooping – implications on the state maintenance on PE routers PE router has to maintain (S, G) state at least for all the (S,G) received from all the local CEs E.g., assume PE with 1,000 CEs/sites, each VPLS site has at any given point in time on average receivers for 3 groups, PE has to maintain at least 3,000 (S,G) entries PE router maintains (S, G) state by processing PIM Join messages received from (a) all sites of VPLSs connected to that PE, AND (b) all the remote PEs that have members of these VPLSs E.g., assume PE router with 1,000 CEs/sites, each VPLS site has at any given point in time on average receivers for 3 group, each group is present on average in 10 sites, PE router has to process ~300 PIM Join per second, and ~900 (S, G) entries per second in a steady state due to periodic PIM Join and PIM Join suppression |