Configuring State Refresh Parameters; Configuring Pim-Dm Graft Retry Timer - HP 5920 series Configuration Manual

Ip multicast
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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 shared-media subnet can have the state refresh feature only if the
state refresh feature is enabled on all PIM routers on the subnet.
To enable the state refresh feature on all routers in PIM-DM domain:
Step
1.
Enter system view.
2.
Enter interface view.
3.
Enable the state refresh
feature.

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 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 it receives next state refresh message.
If the router receives a new state refresh message within the specified waiting time, it discards the
message. If this timer times out, the router accepts a new state refresh message, refreshes its own PIM-DM
state, and resets the waiting timer.
The TTL value of a state refresh message decrements by 1 whenever it passes a router before it is
forwarded to the downstream node until the TTL value comes down to 0. In a small network, a state
refresh message might cycle in the network. To effectively control the propagation scope of state refresh
messages, configure an appropriate TTL value based on the network size on the router directly connected
with the multicast source.
To configure state refresh parameters:
Step
1.
Enter system view.
2.
Enter PIM view.
3.
Configure the interval to send state
refresh messages.
4.
Configure the time to wait before
receiving a new state refresh
message.
5.
Configure the TTL value of state
refresh messages.

Configuring PIM-DM graft retry timer

In PIM-DM, graft is the only type of message that uses the acknowledgment mechanism. In a PIM-DM
domain, if a router does not receive a graft-ack message from the upstream router within the specified
time after it sends a graft message, the router keeps sending new graft messages at a configurable
Command
system-view
interface interface-type
interface-number
pim state-refresh-capable
Command
system-view
pim
state-refresh-interval interval
state-refresh-rate-limit time
state-refresh-ttl ttl-value
71
Remarks
N/A
N/A
By default, the state refresh
feature is enabled.
Remarks
N/A
N/A
By default, the interval to send
state refresh messages is 60
seconds.
By default, the waiting time is
30 seconds.
By default, the TTL value of
state refresh messages is 255.

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