H3C Technologies H3C S7500E Series Switches - Manual (Page 154)

6-17
To do... Use the command... Description
Enter system view system-view —
Create a VPN instance and
enter VPN instance view
ip vpn-instance
vpn-instance-name
—
Configure a route-distinguisher
(RD) for the VPN instance
route-distinguisher
route-distinguisher
Required
Not configured by default
Enable IP multicast routing multicast routing-enable
Required
Disabled by default
Enter interface view
interface interface-type
interface-number
—
Associate the current interface
with the VPN instance
ip binding vpn-instance
vpn-instance-name
Required
No VPN instance is associated
with an interface by default.
Enable PIM-DM pim dm
Required
Disabled by default
z All the interfaces in the same VPN instance on the same device must work in the same PIM
mode.
z PIM-DM does not work with multicast groups in the SSM group grange.
z For details about the ip vpn-instance, route-distinguisher and ip binding vpn-instance
commands, see MPLS L3VPN Configuration Commands in the MPLS Command
Reference.
z For details about the multicast routing-enable command, see Multicast Routing and
Forwarding Configuration Commands in the IP Multicast Command Reference.
Enabling State-Refresh Capability
Pruned interfaces resume multicast forwarding when the pruned state times out. To prevent this,
the router with the multicast source attached periodically sends an (S, G) state-refresh
message, which is forwarded hop by hop along the initial multicast flooding path of the PIM-DM
domain, to refresh the prune timer state of all the routers on the path. A multi-access subnet