3Com MSR 50 Series Configuration Manual page 1191

router sets a join/prune timeout timer for each pruned downstream interface, and
resumes the forwarding state of the pruned interface when this timer times out.
When a router fails to receive subsequent multicast data from the multicast source
S, the router will not immediately delete the corresponding (S, G) entries; instead,
it maintains (S, G) entries for a period of time, namely the multicast source
lifetime, before deleting the (S, G) entries.
Configuring PIM common timers globally
Follow these steps to configure PIM common timers globally:
To do...
Enter system view
Enter public instance PIM view
or VPN instance PIM view
Configure the hello interval
Configure assert timeout time holdtime assert interval
Configure the join/prune
interval
Configure the join/prune
timeout time
Configure the multicast
source lifetime
Configuring PIM common timers on an interface
Follow these steps to configure PIM common timers on an interface:
To do...
Enter system view
Enter interface view
Configure the hello interval
Configure the maximum delay
between hello messages
Configure assert timeout time pim holdtime assert interval Optional
Configure the join/prune
interval
Configure the join/prune
timeout time
n
If there are no special networking requirements, we recommend that you use the
default settings.
Configuring PIM Common Information
Use the command...
system-view
pim [ vpn-instance
vpn-instance-name ]
timer hello interval
timer join-prune interval
holdtime join-prune interval Optional
source-lifetime interval
Use the command...
system-view
interface interface-type
interface-number
pim timer hello interval
pim triggered-hello-delay
interval
pim timer join-prune
interval
pim holdtime join-prune
interval
1191
Remarks
-
-
Optional
30 seconds by default
Optional
180 seconds by default
Optional
60 seconds by default
210 seconds by default
Optional
210 seconds by default
Remarks
-
-
Optional
30 seconds by default
Optional
5 seconds by default
180 seconds by default
Optional
60 seconds by default
Optional
210 seconds by default