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Cisco ME 3400 Ethernet Access Switch Software Configuration Guide
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Chapter 40 Configuring IP Multicast Routing 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 Purpose
Step 1 configure terminal Enter global configuration mode.
Step 2 ip multicast-routing distributed Enable IP multicast distributed switching.
Step 3 interface interface-id 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 9-22.
Step 4 no shutdown Enable the port, if necessary. By default, user network interfaces (UNIs)
and enhanced network interfaces (ENIs) are disabled, and network node
interfaces (NNIs) are enabled.
Step 5 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 40-9.
Step 6 ip pim {dense-mode | sparse-mode |
sparse-dense-mode}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 40-22.
• 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 7 end Return to privileged EXEC mode.