H3C Technologies H3C S12500-X Series Switches - Manual (Page 168)

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Step Command Remarks
5. Enable IPv6 PIM-DM. ipv6 pim dm
By default, IPv6 PIM-DM is
disabled.
Enabling the state refresh feature
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 shared-media subnet can have the state refresh feature
only if the state refresh feature is enabled on all IPv6 PIM routers on the subnet.
To enable the state refresh feature on all routers in IPv6 PIM-DM domain:
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
feature.
ipv6 pim state-refresh-capable
By default, the state refresh feature
is enabled.
Configuring state refresh parameters
The router directly connected with the IPv6 multicast source periodically sends state refresh messages.
You can configure the interval for sending such messages on that router.
A router might receive duplicate state refresh messages within a short time. To prevent this situation, you
can configure the amount of time that the router must wait before receiving the next state refresh message.
If the router receives a new state refresh message within the specified waiting time, it discards it. If this
timer times out, the router accepts a new state refresh message, refreshes its own IPv6 PIM-DM state, and
resets the waiting timer.
The hop limit value of a state refresh message decrements by 1 whenever it passes a router before it is
forwarded to the downstream node until the hop limit value comes down to 0. In a small network, a state
refresh message might cycle in the network. To control the propagation scope of state refresh messages,
configure an appropriate hop limit value based on the network size on the router directly connected with
the IPv6 multicast source.
To configure state refresh parameters:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter IPv6 PIM view.
ipv6 pim [ vpn-instance
vpn-instance-name ]
N/A
3. Configure the interval to send
state refresh messages.
state-refresh-interval interval
By default, the interval to send
refresh messages is 60 seconds.