130
Configuring state-refresh parameters
The router directly connected with the multicast source periodically sends state-refresh messages. You
can configure an interval for sending such messages.
A router might receive multiple state-refresh messages within a short time, and some of them might be
duplicated messages. To keep a router from receiving such duplicated messages, you can configure the
time that the router must wait before it receives the next state-refresh message. If the router receives a
new state-refresh message within the waiting time, it discards the message. If this timer times out, the
router will accept a new state-refresh message, refresh its own PIM-DM state, and reset 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 control the propagation scope of state-refresh messages,
you must configure an appropriate TTL value based on the network size.
You should perform the following configurations on all routers in the PIM domain.
Follow these steps to configure state-refresh parameters:
To do... Use the command... Remarks
Enter system view
system-view —
Enter public network PIM view or VPN
instance PIM view
pim [ vpn-instance vpn-instance-
name ]
—
Configure the interval between state-
refresh messages
state-refresh-interval interval
Optional
60 seconds by default
Configure the time to wait before
receiving a new state-refresh message
state-refresh-rate-limit interval
Optional
30 seconds by default
Configure the TTL value of state-refresh
messages
state-refresh-ttl ttl-value
Optional
255 by default
Configuring PIM-DM graft retry period
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
interval—namely, graft retry period—until it receives a graft-ack message from the upstream router.
Follow these steps to configure the graft retry period:
To do... Use the command... Remarks
Enter system view
system-view —
Enter interface view
interface interface-type interface-
number
—
Configure the graft retry period
pim timer graft-retry interval
Optional
3 seconds by default.
To Next Page
Loading...
Need help?
General
