H3C Technologies H3C S7500E Series Switches - Manual (Page 367)

13-16
To do... Use the command... Remarks
Enable IPv6 PIM-DM pim ipv6 dm
Required
Disabled by default
z All the interfaces of the same device must work in the same IPv6 PIM mode.
z IPv6 PIM-DM cannot be used for IPv6 multicast groups in the IPv6 SSM group range.
For details about the multicast ipv6 routing-table command, see IPv6 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 directly connected with the IPv6 multicast source periodically sends an (S, G)
state-refresh message, which is forwarded hop by hop along the initial flooding path of the IPv6
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
IPv6 PIM routers on the subnet.
Follow these steps to enable the state-refresh capability:
To do... Use the command... Remarks
Enter system view system-view —
Enter interface view
interface interface-type
interface-number
—
Enable the state-refresh
capability
pim ipv6
state-refresh-capable
Optional
Enabled by default
Configuring State Refresh Parameters
The router directly connected with the multicast source periodically sends state-refresh
messages. You can configure the interval for sending such messages.
A router may receive multiple state-refresh messages within a short time, of which some may
be duplicated messages. To keep a router from receiving such duplicated messages, you can
configure the time the router must wait before receiving the next state-refresh message. If a