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PIM Sparse-Mode | 769
• In the downstream PIM TIB, states and timers are maintained for each VLAN and member port. The
downstream outgoing-interface timers for each valid (*,G) and (S,G) entry are started for each VLAN/
port and upstream neighbor combination: (port,*,G,neighbor) or (port,S,G,neighbor), where port is a
downstream port and neighbor is the upstream neighbor.
• A timer is removed when a timer times out or a prune message is received for a specific VLAN
member port.
• PIM-SM snooping does not use the unicast Real Time Monitor (RTM) to forward snooped
packets.
• All multicast route and router information is timed-out based on the hold-time indicated in the PIM
hello and PIM-SM join/prune control packets.
Configuration Notes and Restrictions
The following conditions apply when you configure and use PIM snooping on a switch:
• PIM-SM snooping is deployed in a Layer 2 environment and is mutually exclusive with PIM multicast
routing. If you enable PIM-SM snooping, you cannot enable PIM-SM or PIM-DM. If you enable
PIM-SM snooping, you cannot enable PIM-SM or PIM-DM
• PIM-SM snooping is supported with IGMP snooping, and forwards the IGMP report on the port that
connects to the PIM DR.
It is recommended that you do not enable IGMP snooping on a PIM-SM snooping-enabled VLAN
interface unless until it is necessary for VLAN operation.
For information on the egress ports used for outgoing multicast traffic when you enable PIM-SM
snooping and IGMP snooping at the same time on a VLAN interface, see PIM-SM and IGMP Snoop-
ing: Usage Notes on page 766.
• PIM-SM snooping listens to PIM hello and PIM-SM join and prune messages while maintaining the
VLAN- and port-specific information in multicast packets that are snooped.