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IOS Configuration: PIM

Enabling PIM Sparse-Dense Mode

1. Enable multicast routing

2. Turn on PIM in the appropriate mode on selected interfaces

3. Set up rendezvous points (RPs)

Enable Multicast Routing

Router(config)# ip multicast-routing

Turning on PIM

PIM is enabled at the interface level.

Enabling PIM on an interface automatically enables IGMP.

Router(config-if)# ip pim {dense-mode | sparse-mode | sparse-dense-mode}

Router(config-if)# ip pim version {1 | 2}

Changing the PIM version is optional.

Configuring RPs

Manual configuration

Router(config)# ip pim rp-address <IP address> [<ACL>] [override]

Auto-RP (PIMv1)

Configure a router to act as the mapping agent:

Router(config)# ip pim send-rp-discovery <interface> scope <TTL>

The TTL specified determines the scope of the RP (in hop counts).

Configure candidate RPs:

Router(config)# ip pim send-rp-announce <interface> scope <TTL> [group-list <ACL>]

[interval <seconds>]

Bootstrap Router Method (PIMv2)

Define a BSR:

Router(config)# ip pim bsr-candidate <interface> <hash mask length> [<priority>]

Configure candidate RPs:

Router(config)# ip pim rp-candidate <interface> <ttl> [group-list <ACL>]

By default, bootstrap messages flood throughout the PIM domain. Border routers can be defined to stop forwarding the messages:

Router(config)# ip pim border

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Verifying Operation

show ip mroute

Displays the multicast routing table.

show ip pim interface

Lists all interfaces participating in PIM.

show ip pim neighbors

Lists all PIM neighbors.

show ip pim rp

Displays the RP for each multicast group.

show ip rpf <address>

Inspects reverse-path forwarding information for an address.