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Example: IPv4 Multicast with Interprovider VPNs Configuration

 
Figure 1: IPv4 Multicast with Interprovider VPNs Topology Diagram
IPv4 Multicast with Interprovider
VPNs Topology Diagram

Interprovider VPNs are also mentioned in RFC 4364. An example is shown in Figure 1. The topology is slightly different; the main difference is the addition of MSDP between the two provider core transit (P) routers. In this limited topology, each P router is an SP-RP for the local autonomous system (AS), and Router CE1 is the VPN C-RP. VPN-A is the name of the routing instance on routers PE0 and PE1.

Router CE0

Router PE0

Router P0

Router P1

Router PE1

Router CE1

Verifying Your Work

The show commands used to verify proper functionality of multicast in an interprovider environment are the same ones used with the first Layer 3 VPN multicast example (see Example: Basic IPv4 Multicast over a Layer 3 VPN Configuration).

The following output provides details for RP and the PIM join information:

Router CE0 Status

user@CE0> show pim rps extensive
user@CE0> show pim join extensive

Router PE0 Status

user@PE0> show pim rps extensive
user@PE0> show pim rps extensive instance VPN-A
user@PE0> show pim join extensive
user@PE0> show pim join extensive instance VPN-A

Router P0 Status

user@P0> show pim rps extensive
user@P0> show pim join extensive

Router P1 Status

user@P1> show pim rps extensive
user@P1> show pim join extensive

Router PE1 Status

user@PE1> show pim rps extensive
user@PE1> show pim rps extensive instance VPN-A
user@PE1> show pim join extensive
user@PE1> show pim join extensive instance VPN-A

Router CE1 Status

user@CE1> show pim rps extensive
user@CE1> show pim join extensive