H3C Technologies H3C S12500 Series Switches - Manual (Page 142)

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Step Command Remarks
3. Enter interface view.
interface interface-type
interface-number
N/A
4. Enable PIM-DM. pim dm Disabled by default.
To enable PIM-DM in a VPN instance:
Step Command Description
1. Enter system view. system-view N/A
2. Create a VPN instance and
enter VPN instance view.
ip vpn-instance vpn-instance-name N/A
3. Configure a
route-distinguisher (RD) for the
VPN instance.
route-distinguisher
route-distinguisher
Not configured by default.
4. Enable IP multicast routing. multicast routing-enable Disabled by default.
5. Enter interface view.
interface interface-type
interface-number
N/A
6. Bind the interface with a VPN
instance.
ip binding vpn-instance
vpn-instance-name
By default, an interface belongs to
the public network, and is not
bound with any VPN instance.
7. Enable PIM-DM. pim dm Disabled by default.
For more information about the ip vpn-instance, route-distinguisher, and ip binding vpn-instance
commands, see MPLS 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 can have the state-refresh capability only if the
state-refresh capability is enabled on all PIM routers on the subnet.
To enable the state-refresh capability:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter interface view.
interface interface-type
interface-number
N/A
3. Enable the state-refresh
capability.
pim state-refresh-capable
Optional.
Enabled by default.