H3C Technologies H3C S10500 Series Switches - Manual (Page 189)

174
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—namely, the multicast source lifetime—before deleting the (S, G) entry.
Configuring PIM common timers globally
Follow these steps to configure PIM common timers globally:
To do... Use the command... Remarks
Enter system view system-view —
Enter public network PIM view or
VPN instance PIM view pim [ vpn-instance
vpn-instance-name ]
—
Configure the hello interval timer hello interval
Optional
30 seconds by default
Configure the join/prune interval timer join-prune interval
Optional
60 seconds by default
Configure the join/prune timeout
time
holdtime join-prune interval
Optional
210 seconds by default
Configure assert timeout time holdtime assert interval
Optional
180 seconds by default
Configure the multicast source
lifetime
source-lifetime interval
Optional
210 seconds by default
Configuring PIM common timers on an interface
Follow these steps to configure PIM common timers on an interface:
To do... Use the command... Remarks
Enter system view system-view —
Enter interface view
interface interface-type
interface-number
—
Configure the hello interval pim timer hello interval
Optional
30 seconds by default