16.1.18 Configuring PIM-SM VRF Gateways [SL-L3A]

Points to note

In an IPv4 multicast extranet, a unicast extranet to the sender must be configured for the forwarding destination VRF and a unicast route must exist.

To use multicast extranets with PIM-SM to perform communication between multicast VRFs, a PIM-SM VRF gateway must be configured. The PIM-SM VRF gateway must be set for the VRF that has the multicast sender. Specify the settings in global configuration mode. The PIM-SM VRF gateway is configured by specifying all group addresses used for the extranet in multicast route filtering as host addresses. At this time, the group addresses specified in a range by using a wildcard mask are not subject to control by the PIM-SM VRF gateway. The figure below shows a configuration example in which packets of group addresses 224.10.10.10, 224.10.10.11, and 224.10.10.12 are forwarded from VRF 10 to the global network. In this situation, VPN 1 (global network) must have a unicast route to the servers (192.168.2.2) on VPN 2(VRF 10.

Figure 16-7: Sample PIM-SM Configuration in VRF (PIM-SM VRF Gateways)

Command examples

1. (config)# ip access-list standard MLTGROUP

   (config-std-nacl)# permit host 224.10.10.10

   (config-std-nacl)# permit host 224.10.10.11

   (config-std-nacl)# permit host 224.10.10.12

   (config-std-nacl)# exit

   (config)# route-map MLTEXNET permit 10

   (config-route-map)# match ip address MLTGROUP

   (config-route-map)# exit

   Specifies 224.10.10.10, 224.10.10.11, and 224.10.10.12 as the group addresses used for the PIM-SM VRF gateway.

2. (config)# vrf definition 10

   (config-vrf)# import multicast inter-vrf MLTEXNET

   (config-vrf)# exit

   Specifies the groups that will be forwarded from VRF 10 to other VRFs.

3. (config)# ip pim vrf 10 vrf-gateway

   Configures the PIM-SM VRF gateway for VRF 10.