H3C Technologies H3C S12500 Series Switches - Manual (Page 417)

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Configuring the prune delay
Configuring the prune delay on an upstream router in a shared network segment can make the upstream
router not perform the prune action immediately after receiving 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 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 configure the prune delay time
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter IPv6 PIM view. pim ipv6 N/A
3. Configure the prune delay. prune delay interval
Optional.
3 seconds by default, which equals
the prune pending time.
Configuring IPv6 PIM common timers
IPv6 PIM routers discover IPv6 PIM neighbors and maintain IPv6 PIM neighboring relationships with
other routers by periodically sending hello messages.
After receiving a hello message, an IPv6 PIM router waits a random period, which is smaller than the
maximum delay between hello messages, before sending a hello message. This avoids collisions that
occur when multiple IPv6 PIM routers send hello messages simultaneously.
An IPv6 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 loser will resume IPv6 multicast
forwarding.
When a router fails to receive subsequent IPv6 multicast data from the IPv6 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 (IPv6 multicast source lifetime) before deleting the (S, G) entry.
Configuring IPv6 PIM common timers globally
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter IPv6 PIM view. pim ipv6 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.