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value takes effect. If you want to enable neighbor tracking, be sure to enable the neighbor tracking
feature on all PIM routers on a multi-access subnet.
The LAN-delay setting will cause the upstream routers to delay processing received prune messages. The
override-interval sets the length of time that a downstream router can wait before sending a prune
override message. When a router receives a prune message from a downstream router, it does not
perform the prune action immediately. Instead, it maintains the current forwarding state for a period of
LAN-delay plus override-interval. If the downstream router needs to continue receiving multicast data, it
must send a join message within the prune override interval. Otherwise, the upstream router will perform
the prune action when the period of LAN-delay plus override-interval times out.
A hello message sent from a PIM router contains a generation ID option. The generation ID is a random
value for the interface on which the hello message is sent. Normally, the generation ID of a PIM router
does not change unless the status of the router changes (for example, when PIM is just enabled on the
interface or the device is restarted). When the router starts or restarts sending hello messages, it
generates a new generation ID. If a PIM router finds that the generation ID in a hello message from the
upstream router has changed, it assumes that the status of the upstream neighbor is lost or that the
upstream neighbor has changed. In this case, it triggers a join message for state update.
If you disable join suppression (namely, enable neighbor tracking), be sure to disable the join
suppression feature on all PIM routers on a multi-access subnet. Otherwise, the upstream router will fail
to explicitly track join messages from downstream routers.
Configuring hello options globally
Ste
Command Remarks
1. Enter system view.
system-view N/A
2. Enter PIM view.
pim N/A
3. Configure the priority for DR
election.
hello-option dr-priority priority
Optional.
1 by default.
4. Configure PIM neighbor
timeout time.
hello-option holdtime interval
Optional.
105 seconds by default.
5. Configure the prune message
delay time (LAN-delay).
hello-option lan-delay interval
Optional.
500 milliseconds by default.
6. Configure the prune override
interval.
hello-option override-interval
interval
Optional.
2500 milliseconds by default.
7. Disable join suppression.
hello-option neighbor-tracking Enabled by default.
Configuring hello options on an interface
Ste
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