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After receiving a hello message, an IPv6 PIM router waits a random period, which is smaller than the
maximum delay between hello messages, before sending a hello message. This avoids collisions
that occur when multiple IPv6 PIM routers send hello messages simultaneously.
An IPv6 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 maintain the assert state
for a period of time. When the assert state times out, the assert loser resumes IPv6 multicast
forwarding.
When a router fails to receive subsequent IPv6 multicast data from the IPv6 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 IPv6 multicast source lifetime) before deleting the (S, G) entry.
NOTE:
If no special networking requirements are raised, use the default settings.
Configuring common IPv6 PIM timers globally
Step
Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter public network IPv6
PIM view or VPN instance
IPv6 PIM view.
pim ipv6
[
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 IPv6 multicast
source lifetime.
source-lifetime
interval
Optional.
210 seconds by default.
Configuring common IPv6 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 ipv6 timer hello
interval
Optional.
30 seconds by default.
4.
Configure the maximum
delay between hello
messages.
pim ipv6 triggered-hello-delay
interval
Optional.
5 seconds by default.
5.
Configure the join/prune
interval.
pim ipv6 timer join-prune
interval
Optional.
60 seconds by default.
