Cisco CRS Series - Configuring the MDT Source Per VRF; Specifying the IGMP VRF Instance

PurposeCommand or Action
commit
Step 4
Specifying the IGMP VRF Instance
SUMMARY STEPS
1.
configure
2.
router igmp
3.
vrf vrf-name
4.
commit
DETAILED STEPS
PurposeCommand or Action
configure
Step 1
Enters IGMP configuration mode.router igmp
Example:
RP/0/RP0/CPU0:router(config)# router igmp
Step 2
Configures a VRF instance.
vrf vrf-name
Example:
RP/0/RP0/CPU0:router(config-igmp)# vrf vrf_B
Step 3
commit
Step 4
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.
Cisco IOS XR Multicast Configuration Guide for the Cisco CRS Router, Release 5.2.x
105
Implementing Multicast Routing on Cisco IOS XR Software
Configuring Multicast VPN