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Configuring common PIM timers
PIM routers discover PIM neighbors and maintain PIM neighboring relationships with other routers
by periodically sending hello messages.
After receiving a hello message, a PIM router waits a random period, which is smaller than the
maximum delay between hello messages, before sending a hello message. This delay avoids
collisions that occur when multiple PIM routers send hello messages simultaneously.
A PIM router periodically sends join/prune messages to its upstream for state update. A join/prune
message contains the join/prune timeout timer. The upstream router sets a join/prune timeout timer
for each pruned downstream interface.
Any router that has lost assert election prunes its downstream interface and maintains the assert
state for a period of time. When the assert state times out, the assert losers resumes multicast
forwarding.
When a router fails to receive subsequent multicast data from multicast source S, the router does not
immediately delete the corresponding (S, G) entry. Instead, it maintains the (S, G) entry for a period
of time (the multicast source lifetime) before deleting the (S, G) entry.
NOTE:
If no special networking requirements are raised, use the default settings.
Configuring common PIM timers globally
Step
Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter public network PIM
view or VPN instance PIM
view.
pim
[
vpn-instance
vpn-instance-name
]
N/A
3.
Configure the hello interval.
timer hello
interval
Optional.
30 seconds by default.
4.
Configure the join/prune
interval.
timer join-prune
interval
Optional.
60 seconds by default.
5.
Configure the join/prune
timeout timer.
holdtime join-prune
interval
Optional.
210 seconds by default.
6.
Configure assert timeout
timer.
holdtime assert
interval
Optional.
180 seconds by default.
7.
Configure the multicast
source lifetime.
source-lifetime
interval
Optional.
210 seconds by default.
Configuring common PIM timers on an interface
Step
Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter interface view.
interface
interface-type
interface-number
N/A
3.
Configure the hello interval.
pim timer hello
interval
Optional.
30 seconds by default.
