HP A8800 Configuration Manual page 169

Upon receiving a hello message, a PIM router waits a random period, which is smaller than the
maximum delay between hello messages, before sending out a hello message. This 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 time. The upstream router sets a join/prune timeout timer for
each pruned downstream interface.
Any router that has lost assert election will prune its downstream interface and maintain the assert state
for a period of time. When the assert state times out, the assert losers will resume 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, namely the multicast source lifetime, before deleting the (S, G) entry.
Configuring PIM common timers globally
Step
1. Enter system view.
2. Enter public network PIM view
or VPN instance PIM view.
3. Configure the hello interval.
4. Configure the join/prune
interval.
5. Configure the join/prune
timeout time.
6. Configure assert timeout time.
7. Configure the multicast source
lifetime.
Configuring PIM common timers on an interface
Step
1. Enter system view.
2. Enter interface view.
3. Configure the hello interval.
4. Configure the maximum delay
between hello messages.
5. Configure the join/prune
interval.
Command
system-view
pim [ vpn-instance
vpn-instance-name ]
timer hello interval
timer join-prune interval
holdtime join-prune interval
holdtime assert interval
source-lifetime interval
Command
system-view
interface interface-type
interface-number
pim timer hello interval
pim triggered-hello-delay interval
pim timer join-prune interval
157
Remarks
N/A
N/A
Optional.
30 seconds by default.
Optional.
60 seconds by default.
Optional.
210 seconds by default.
Optional.
180 seconds by default.
Optional.
210 seconds by default.
Remarks
N/A
N/A
Optional.
30 seconds by default.
Optional.
5 seconds by default.
Optional.
60 seconds by default.