4000 Router Series IP Multicast Configuration Guide

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Enabling PIM-DM

Enable IP multicast routing before you configure PIM.

With PIM-DM enabled on interfaces, routers can establish PIM neighbor relationship and process PIM

messages from their PIM neighbors. When you deploy a PIM-DM domain, enable PIM-DM on all

non-border interfaces of the routers.

IMPORTANT:

ll the interfaces on a device must operate in the same PIM mode in the public network or the same VPN

instance.

To enable PIM-DM:

Ste

Command Remarks

1. Enter system view.

system-view

N/A

2. Enable IP multicast routing

and enter MRIB view.

multicast routing [ vpn-instance

vpn-instance-name ]

By default, IP multicast routing is

disabled.

3. Return to system view.

quit N/A

4. Enter interface view.

interface interface-type

interface-number

N/A

5. Enable PIM-DM.

pim dm By default, PIM-DM is disabled.

Enabling the state refresh feature

Pruned interfaces resume multicast forwarding when the pruned state times out. To prevent this, the router

with the multicast source attached periodically sends an (S, G) state refresh message, which is forwarded

hop by hop along the initial multicast flooding path of the PIM-DM domain, to refresh the prune timer

state of all the routers on the path. A shared-media subnet can have the state refresh feature only if the

state refresh feature is enabled on all PIM routers on the subnet.

To enable the state refresh feature on all routers in PIM-DM domain:

Ste

Command Remarks

1. Enter system view.

system-view

N/A

2. Enter interface view.

interface interface-type

interface-number

N/A

3. Enable the state refresh

feature.

pim state-refresh-capable

By default, the state refresh

feature is enabled.

Configuring state refresh parameters

The router directly connected with the multicast source periodically sends state refresh messages. You can

configure the interval for sending such messages on that router.

A router might receive duplicate state refresh messages within a short time. To prevent this situation, you

can configure the amount of time that the router must wait before it receives next state refresh message.