Configuring Pim-Ssm; Related Configuration Tasks - Dell C9000 Series Networking Configuration Manual

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receiving the first multicast packet from a particular source, the last-hop DR sends a PIM Join message
to the source to create an SPT to it.
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There are two paths, then, between the receiver and the source, a direct SPT and an RPT. One router
receives a multicast packet on two interfaces from the same source in this case; this router prunes the
shared tree by sending a PIM Prune message to the RP that tells all routers between the source and the
RP to remove the outgoing interface from the (*,G) entry, and tells the RP to prune its SPT to the source
with a Prune message.
Dell Networking OS Behavior: When the router creates an SPT to the source, there are then two paths
between the receiver and the source, the SPT and the RPT. Until the router can prune itself from the RPT, the
receiver receives duplicate multicast packets which may cause disruption. Therefore, the router must prune
itself from the RPT as soon as possible. Dell Networking OS optimizes the shared to shortest-path tree
switchover latency by copying and forwarding the first (S,G) packet received on the SPT to the PIM task
immediately upon arrival. The arrival of the (S,G) packet confirms for PIM that the SPT is created, and that it
can prune itself from the shared tree.
Important Point to Remember
If you use a Loopback interface with a /32 mask as the RP, you must enable PIM Sparse-mode on the
interface.

Configuring PIM-SSM

Configuring PIM-SM is a three-step process.
1
Enable multicast routing (refer to the following step).
2
Select a rendezvous point.
3
Enable PIM-SM on an interface.
Enable multicast routing.
CONFIGURATION mode
ip multicast-routing

Related Configuration Tasks

The following are related PIM-SM configuration tasks.
Configuring S,G Expiry Timers
Configuring a Static Rendezvous Point
Configuring a Designated Router
Creating Multicast Boundaries and Domains
PIM Sparse-Mode (PIM-SM)
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