H3C Technologies H3C S12500 Series Switches - Manual (Page 171)

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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 prune delay. prune delay interval
Optional.
3 seconds by default, which equals
the prune pending time.
Configuring PIM common timers
PIM routers discover PIM neighbors and maintain PIM neighboring relationships with other routers by
periodically sending out 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 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 (multicast source lifetime) before deleting the (S, G) entry.
Configuring PIM common 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 time.
holdtime join-prune interval
Optional.
210 seconds by default.
6. Configure assert timeout time. holdtime assert interval
Optional.
180 seconds by default.
7. Configure the multicast source
lifetime.
source-lifetime interval
Optional.
210 seconds by default.