4000 Router Series IP Multicast Configuration Guide

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[CEb2-ospf-1-area-0.0.0.0] network 3.3.3.3 0.0.0.0

[CEb2-ospf-1-area-0.0.0.0] network 10.11.0.0 0.0.255.255

[CEb2-ospf-1-area-0.0.0.0] quit

[CEb2-ospf-1] quit

Verifying the configuration

Use the display multicast-domain default-group command to display the default-group information.

# Display information about the default-groups in VPN instances on PE 1.

[PE1] display multicast-domain default-group

Group address Source address Interface VPN instance

239.1.1.1 1.1.1.1 MTunnel0 a

239.4.4.4 1.1.1.1 MTunnel1 b

# Display information about the default-groups in VPN instances on PE 4.

[PE4] display multicast-domain default-group

Group address Source address Interface VPN instance

239.1.1.1 1.1.1.4 MTunnel0 a

239.4.4.4 1.1.1.4 MTunnel1 b

Troubleshooting MD-VPN

This section describes common MD-VPN problems and how to troubleshoot them.

A default-MDT cannot be established

Symptom

The default-MDT cannot be established. PIM neighboring relationship cannot be established between PE

devices' interfaces that are in the same VPN instance.

Analysis

• The construction of the default-MDT requires effective MTI interfaces. The MTI interfaces take effect

only after the default-group is specified and the MD source interface gets the public IP address.

• On different PE devices, the same default-group must be configured for the same VPN instance. A

default-group address uniquely identifies a default-MDT. If different default-group addresses have

been configured for a VPN instance on different PE devices, a default-MDT cannot be established

for that VPN instance on different PE devices.

• The same PIM mode must run on all the interfaces of the same VPN instance on different PE devices

and on all the interfaces of the P router, so a default-MDT can be correctly built for the VPN instance

and PIM neighboring relationship can be established between the VPN instance on the local PE

device and the same VPN instance on the remote PE device.

• BGP and unicast route configurations are prerequisites for PIM to obtain correct routing information.

Only when at least one interface of the VPN instance is enabled with PIM, PIM can be enabled on

the MTI interface. PIM neighboring relationship can be established between the same VPN

instance on different PE devices only after the MTI interface obtains an IP address and gets PIM

enabled.