Virtual Private LAN Services
7750 SR OS Services Guide Page 503
PIM Proxy
For PIM proxy configurations, VPLS PE routers perform the following:
• Snoop hellos and flood hellos in fast data path.
• Consume join/prune messages from CE routers.
• Generate join/prune messages upstream using the IP address of one of the downstream CE
routers.
• Run an upstream PIM state machine to determine whether a join/prune message should be
sent upstream.
• When LDP multicast state distribution is enabled, generate PIM messages for LDP.
Join/prune suppression is not required to be disabled on CE routers, but it requires all PEs in the
VPLS to have PIM proxy enabled. Otherwise, CEs behind the PE(s) that do not have PIM proxy
enabled may not be able to get multicast traffic that they are interested in if they have join/prune
suppression enabled.
When PIM proxy is enabled, but a VPLS PE router detects a condition where join/prune
suppression is disabled on all CE routers, the PE router put PIM proxy into a plain PIM snooping
state to improve efficiency. A trap is generated to report the scenario to the operator and is logged
to syslog. If the condition changes, for example, join/prune suppression enabled on a CE router,
PIM proxy is placed back into operational state. Again, a trap is generated to report the condition
to the operator and is logged to syslog.
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