SMC Networks SMC6724L3 manual 233, Configuring PIM-DM Interface Settings

MULTICAST ROUTING

CLI – This example enables PIM-DM globally and displays the current status.

Console(config)#router pim	4-302
Console#show router pim	4-308
Admin Status: Enabled
Console#

Configuring PIM-DM Interface Settings

To fully enable PIM-DM, you need to enable multicast routing globally for the router (page 3-219),enable PIM-DM globally for the router

(page 3-232),and also enable PIM-DM for each interface that will participate in multicast routing.

Command Usage

•PIM-DM functions similar to DVMRP by periodically flooding the network with traffic from any active multicast server (page 3-222). It also uses IGMP to determine the presence of multicast group members. The main difference, is that it uses the router’s unicast routing table to determine if the interface through which a packet is received provides the shortest path back to the source.

•Dense-mode interfaces are subject to multicast flooding by default, and are only removed from the multicast routing table when the router determines that there are no group members or downstream routers, or when a prune message is received from a downstream router.

•The interface settings that control the prune and graft messages (i.e., prune holdtime) should be configured to the same values on all routers throughout the network to allow PIM to function properly.

Command Attributes

•VLAN – Selects a VLAN interface on this router.

•PIM-DM Protocol Status – Enables/disables PIM-DM. (Default: Disabled)

•Hello Interval – Sets the frequency at which PIM hello messages are transmitted. Hello messages are sent to neighboring PIM routers from which this device has received probes, and are used to verify whether or

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