JUNOSe 10.0.2 Release Notes

Configuring the Default MDT

To configure the default Multicast Distribution Trees (MDT):

1. On the parent virtual-router, configure an IP interface over the MDT interface, and make it a Protocol Independent Multicast (PIM) interface.
host1(config)#virtual-router pe1
host1:pe1(config)#ip multicast-routing
host1:pe1(config)#interface loopback 0
host1:pe1(config-if)#ip address 1.1.1.1 255.255.255.255
host1:pe1(config-if)#ip pim sparse-mode
host1:pe1(config-if)#exit
2. Configure the VPN Routing or Forwarding instance (VRF).
host1(config)#virtual-router pe1
host1:pe1(config)#ip vrf pe13
host1:pe1(config-vrf)#rd 100:13
host1:pe1(config-vrf)#route-target both 100:3
host1:pe1(config-vrf)#exit
3. To enable MDT, configure a generic routing encapsulation (GRE) Multicast Tunnel Interface (MTI) for VPN1.
host1:pe1(config)#virtual-router default
host1:(config)#interface tunnel gre:MTI-11 transport-virtual-router pe1
host1:(config-if)#tunnel source 1.1.1.1
host1:(config-if)#tunnel destination 233.3.1.1
host1:(config-if)#tunnel mdt
host1:(config-if)#exit

The tunnel mdt command enables the IP tunnel component to create an MDT interface.

4. For the VRF, configure an IP interface on the MTI interface.
host1(config)#virtual-router pe1
host1:pe1(config)#virtual-router pe1:pe13
host1:pe1:pe13(config)#ip multicast-routing
host1:pe1:pe13(config)#interface loopback 0
host1:pe1:pe13(config-if)#ip address 1.1.1.1 255.255.255.255
host1:pe1:pe13(config-if)#exit

NOTE: The IP address that you configure for the VRF must be identical to the IP address of the loopback interface in the parent virtual router.

5. Configure the MTI interface in the VRF.
host1:pe1:pe13(config)#interface tunnel gre:MTI-11
host1:pe1:pe13(config-if)#ip unnumbered loopback 0
host1:pe1:pe13(config-if)#ip pim sparse-mode
host1:pe1:pe13(config-if)#exit

NOTE: You can use the ip unnumbered loopback 0 command to configure the MTI interface on the VRF as an unnumbered interface, or the ip address 1.1.1.1 255.255.255.255 command to configure it as a numbered interface.

6. Specify the GRE tunnel configuration for the parent virtual router.
host1:pe1(config)#interface tunnel gre:MTI-11.mdt
host1:pe1(config-if)#ip unnumbered loopback 0
host1:pe1(config-if)#ip pim sparse-mode
host1:pe1(config-if)#exit
host1:pe1(config)#virtual-router default

NOTE: The MDT interface in the parent virtual router must be unnumbered.