Cisco ASR 9000 Series Software Manual page 70

Configuring Multicast VPN
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.
In the configuration below, the default VRF does not require explicit reference in Step 5.
Note
SUMMARY STEPS
1. configure
2. multicast-routing
3. address-family [ ipv4 | ipv6 ]
4. mdt source loopback 0
5. exit
6. vrf 101
7. address-family ipv4
8. mdt source loopback 1
9. Repeat the steps 6 to 8, as many times as needed to create other VRFs.
10. commit
11. show pim vrf all mdt interface
DETAILED STEPS
Command or Action
Step 1
configure
Step 2
multicast-routing
Example:
RP/0/RSP0/CPU0:router(config)# multicast-routing
RP/0/RSP0/CPU0:router(config-mcast)#
Step 3
address-family [ ipv4 | ipv6 ]
Example:
RP/0/RSP0/CPU0:router(config-mcast)# address-family ipv4
Cisco ASR 9000 Series Aggregation Services Router Multicast Configuration Guide, Release 5.1.x
70
Implementing Layer-3 Multicast Routing on Cisco IOS XR Software
Purpose
Enables IP multicast routing and forwarding.
Enters ipv4 (or ipv6) address-family submode.