Cisco XR 12000 Series Configuration Guide

Implementing Multicast Routing on Cisco IOS XR Software Cisco ASR 9000 Series Routers
How to Implement Multicast Routing
MCC-47
Multicast Configuration Guide
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Configuring the MDT Source per VRF
This optional feature lets you change the default routing mechanism in a multicast VPN network
topology, which routes all unicast traffic through a BGP peering loopback configured on a default VRF.
Instead, you may configure a loopback that allows you to specify the MDT source using a specific VRF,
as opposed to the default VRF. This overrides the current behavior and updates BGP as part of a MDT
group. BGP then modifies the source and connector attributes in the MDT SAFI and VPN IPv4 updates.
For VRFs on which the MDT source is not configured, the MDT source for the default VRF is applied.
Also, when the MDT source on a VRF is unconfigured, the configuration of the MDT source default
VRF takes effect.
Note In the configuration below, the default VRF does not require explicit reference in Step 3.
SUMMARY STEPS
1. configure
2. multicast-routing
3. mdt source interface type interface-path-id
Step 3
vrf vrf-name
Example:
RP/0/0/CPU0:router(config-igmp)# vrf vrf_B
Configures a VRF instance.
Step 4
end
or
commit
Example:
RP/0/0/CPU0:router(config-igmp-vrf_B)# end
or
RP/0/0/CPU0:router(config-igmp-vrf_B)# commit
Saves configuration changes.
• When you issue the end command, the system prompts
you to commit changes:
Uncommitted changes found, commit them before
exiting (yes/no/cancel)?
[cancel]:
– Entering yes saves configuration changes to the
running configuration file, exits the configuration
session, and returns the router to EXEC mode.
– Entering no exits the configuration session and
returns the router to EXEC mode without
committing the configuration changes.
– Entering cancel leaves the router in the current
configuration session without exiting or
committing the configuration changes.
• Use the commit command to save the configuration
changes to the running configuration file and remain
within the configuration session.
Command or Action Purpose

Cisco XR 12000 Series Specifications

General

Brand	Cisco
Model	XR 12000 Series
Category	Network Router
Language	English