Cisco Catalyst 3550 series Software Configuration Manual page 806

Configuring IP Multicast Routing
Command
Step 3 interface interface-id
Step 4
ip pim version [1 | 2]
Step 5
ip pim {dense-mode | sparse-mode |
sparse-dense-mode}
Step 6 end
Step 7 show running-config
Step 8
copy running-config startup-config
To disable multicasting, use the no ip multicast-routing 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.
Catalyst 3550 Multilayer Switch Software Configuration Guide
34-16
Purpose
Enter interface configuration mode, and specify the Layer 3 interface on
which you want to enable multicast routing.
The specified interface must be one of the following:
• A routed port: a physical port that has been configured as a Layer 3
port by entering the no switchport interface configuration
command.
An SVI: a VLAN interface created by using the interface vlan
•
vlan-id global configuration command.
These ports must have IP addresses assigned to them. For more
information, see the "Configuring Layer 3 Interfaces" section on
page 10-18.
Configure the PIM version on the interface.
By default, Version 2 is enabled and is the recommended setting.
Note All IP multicast-capable Cisco PIM routers using Cisco IOS
Release 11.3(2)T or later start in PIMv2 by default.
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
section on page 34-14.
Enable a PIM mode on the interface.
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.
•
• sparse-dense-mode—Causes the interface to be treated in the mode
in which the group belongs. Sparse-dense-mode is the recommended
setting.
If you are use sparse-mode or sparse-dense mode, you must also
Note
configure an RP. For more information, see the
Rendezvous Point" section on page
Return to privileged EXEC mode.
Verify your entries.
(Optional) Save your entries in the configuration file.
Chapter 34 Configuring IP Multicast Routing
"PIMv1 and PIMv2 Interoperability"
"Configuring a
34-17.
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