HP VPN Firewall Appliances Network Management Configuration Guide

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Setting the prune delay timer
The prune delay timer on an upstream router on a shared-media network can make the upstream router
not perform the prune action immediately after it receives the prune message from its downstream router.
Instead, the upstream router maintains the current forwarding state for a period of time that the prune
delay timer defines. In this period, if the upstream router receives a join message from the downstream
router, it cancels the prune action. Otherwise, it performs the prune action.
To set the prune delay timer:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Enter public network PIM
view.
pim N/A
3. Set the prune delay timer.
prune delay interval
Optional.
By default, the prune delay timer is not configured.
Configuring common PIM timers
PIM routers discover PIM neighbors and maintain PIM neighboring relationship with other routers by
periodically sending 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 timer. 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.
NOTE:
If no special networking requirements are raised, use the default settings for the timers.
To configure common PIM timers globally:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Enter public network PIM view.
pim N/A
3. Configure the hello interval.
timer hello interval
Optional.
30 seconds by default.