Specifications

Configuring IP Multicast Multilayer Switching
IP Multicast MLS Configuration Examples
5
Specifying a Management Interface
When you enable IP multicast MLS, the subinterface (or VLAN interface) that has the lowest VLAN ID
and is active (in the “up” state) is automatically selected as the management interface. The one-hop
protocol Multilayer Switching Protocol (MLSP) is used between a router and a switch to pass messages
about hardware-switched flows. MLSP packets are sent and received on the management interface.
Typically, the interface in VLAN 1 is chosen (if that interface exists). Only one management interface
is allowed on a single trunk link.
In most cases, we recommend that the management interface be determined by default. However, you
can optionally specify a different router interface or subinterface as the management interface. We
recommend using a subinterface with minimal data traffic so that multicast MLSP packets can be sent
and received more quickly.
If the user-configured management interface goes down, the router uses the default interface (the active
interface with the lowest VLAN ID) until the user-configured interface comes up again.
To change the default IP multicast MLS management interface, use the following command in interface
configuration mode:
Monitoring and Maintaining IP Multicast MLS
To monitor and maintain an IP multicast MLS network, use the following commands in EXEC modes,
as needed:
IP Multicast MLS Configuration Examples
The following sections contain example IP multicast MLS implementations. These examples include the
switch configurations, although switch commands are not documented in this router publication. Refer
to the Catalyst 5000 Command Reference for that information.
• Basic IP Multicast MLS Network Examples
• Complex IP Multicast MLS Network Examples
Command Purpose
Router(config-if)# mls rp ip multicast management-interface
Configures an interface as the IP multicast MLS
management interface.
Command Purpose
Router# show ip mroute [group-name | group-address [source]]
Displays hardware switching state for outgoing
interfaces.
Router# show ip pim interface [type number] [count]
Displays PIM interface information.
Router# show mls rp ip multicast [locate] [group [source]
[vlan-id]] | [statistics] | [summary]
Displays Layer 3 switching information.