Troubleshooting Md-Vpn Configuration; Unable To Establish A Share-Mdt; Unable To Build An Mvrf - 3Com S7906E Configuration Manual

Share-group: 239.4.4.4
MTunnel address: 1.1.1.4

Troubleshooting MD-VPN Configuration

Unable to Establish a Share-MDT

Symptom
A share-MDT cannot be established. PIM adjacencies cannot be established between the same VPN
instance's interfaces on different PE devices.
Analysis
On different PE devices, the same share-group must be configured for the same VPN instance. A
share-group address uniquely identifies a share-MDT. If different share-group addresses have
been configured for a VPN instance on different PE devices, a share-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; otherwise, a share-MDT cannot be correctly built
for the VPN instance and PIM adjacencies cannot 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 the MTI interface to obtain an IP
address automatically, and PIM is enabled on at least one interface of the VPN instance so that
PIM can be enabled on the MTI interface. PIM adjacencies 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.
Solution
1) Check the share-group address: Use the display multicast-domain vpn-instance share-group
command to verify that the same share-group address has been configured for the same VPN
instance on different PE devices.
2) Check the running PIM mode: Use the display pim interface command to verify that PIM is
enabled on at least one interface of the same VPN on different PE devices and the same PIM mode
is running on all the interfaces of the same VPN instance on different PE devices and on all the
interfaces of the P router.
3) Check unicast routes. Use the display ip routing-table command to verify that a unicast route
exists from the VPN instance on the local PE device to the same VPN instance on each remote PE
device.
4) Check BGP peer configuration: Use the display bgp peer command to verify that the BGP peer
connections have been correctly configured.

Unable to Build an MVRF

Symptom
A VPN instance cannot create an MVRF correctly.
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