Operating notes

Configuring only one router in a domain as an RP for supporting traffic for a specific multicast group eliminates support redundancy for that group. In this case, if that router becomes unavailable, the group will be excluded from the domain.

If all of the C-RPs and static RPs (if any) in a domain are configured to exclude some multicast groups or ranges of groups, multicast traffic for such groups will be dropped when received by a DR, and will not be forwarded to any RP. (Such groups will still be switched locally if IGMP is enabled on the VLAN where the excluded group traffic is received from a multicast traffic source.)

For multicast traffic from a source to the edge router supporting a multicast receiver requesting the traffic, when an SPT forms, the routing table (on the edge router) will contain both of the following for the supported group:

• (S,G) entry for the source IP address and IP multicast group address supported by the SPT.

• (*,G) entry for the "any" (wildcard) source and (same) multicast group supported by the RP tree.

The router supports up to 2046 flows. A router acting as a DR or RP has a significantly higher CPU load than other routers in a PIM-SM domain.

PIM-SM operation requires statically configured IP addresses and does not operate with IP addresses acquired from a DHCP server.