Cisco 3845 - Security Bundle Router Software Manual page 745
Software configuration guide
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Chapter 33
Configuring IP Multicast Routing
Beginning in privileged EXEC mode, follow these steps to enable IP multicasting, to configure a PIM
version, and to configure a PIM mode. This procedure is required.
Command
Step 1
configure terminal
Step 2
ip multicast-routing distributed
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 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.
OL-23400-01
Purpose
Enter global configuration mode.
Enable IP multicast distributed switching.
Specify the Layer 3 interface on which you want to enable multicast
routing, and enter interface configuration mode.
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 interfaces must have IP addresses assigned to them. For more
information, see the
"Configuring Layer 3 Interfaces" section on
page
9-19.
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
section on page
33-9.
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. If you configure
•
sparse-mode, you must also configure an RP. For more information,
see the
"Configuring a Rendezvous Point" section on page
•
sparse-dense-mode—Causes the interface to be treated in the mode
in which the group belongs. Sparse-dense-mode is the recommended
setting.
Return to privileged EXEC mode.
Verify your entries.
(Optional) Save your entries in the configuration file.
Cisco ME 3800X and 3600X Switch Software Configuration Guide
Configuring IP Multicast Routing
"PIMv1 and PIMv2 Interoperability"
33-22.
33-11
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