Chapter 42 Configuring IP Multicast Routing

Configuring IP Multicast Routing

 

Command

Purpose

Step 4

 

 

ip pim version [1 2]

Configure the PIM version on the interface.

 

 

By default, Version 2 is enabled and is the recommended setting.

 

 

An interface in PIMv2 mode automatically downgrades to PIMv1 mode

 

 

if that interface has a PIMv1 neighbor. The interface returns to Version 2

 

 

mode after all Version 1 neighbors are shut down or upgraded.

 

 

For more information, see the “PIMv1 and PIMv2 Interoperability”

 

 

section on page 42-11.

 

 

 

Step 5 ip pim {dense-mode sparse-mode

Enable a PIM mode on the interface.

 

sparse-dense-mode}

By default, no mode is configured.

 

 

 

 

The keywords have these meanings:

 

 

dense-mode—Enables dense mode of operation.

 

 

sparse-mode—Enables sparse mode of operation. If you configure

 

 

sparse mode, you must also configure an RP. For more information,

 

 

see the “Configuring a Rendezvous Point” section on page 42-14.

 

 

sparse-dense-mode—Causes the interface to be treated in the mode

 

 

in which the group belongs. Sparse-dense mode is the recommended

 

 

setting.

 

 

Note After you enable a PIM mode on the interface, the ip

 

 

mroute-cache distributed interface configuration command is

 

 

automatically entered for the interface and appears in the running

 

 

configuration.

Step 6

 

 

end

Return to privileged EXEC mode.

Step 7

 

 

show running-config

Verify your entries.

Step 8

 

 

copy running-config startup-config

(Optional) Save your entries in the configuration file.

 

 

 

To disable multicasting, use the no ip multicast-routing distributed global configuration command. To return to the default PIM version, use the no ip pim version interface configuration command. To disable PIM on an interface, use the no ip pim interface configuration command.

Note If you enable PIM on multiple interfaces, when most of these interfaces are not on the outgoing interface list, and IGMP snooping is disabled, the outgoing interface might not be able to sustain line rate for multicast traffic because of the extra replication.

Configuring PIM Stub Routing

Beginning in privileged EXEC mode, follow these steps to enable PIM stub routing on an interface. This procedure is optional.

 

 

Catalyst 3750-E and 3560-E Switch Software Configuration Guide

 

 

 

 

 

 

OL-9775-02

 

 

42-13

 

 

 

 

 

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Cisco Systems 3750E manual Configuring PIM Stub Routing, Ip pim version 1, Ip pim dense-mode sparse-mode, Sparse-dense-mode