H3C Technologies H3C SecPath F1000-E - Manual (Page 127)

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Configuring PIM Hello Options
No matter in a PIM-DM domain or a PIM-SM domain, the hello messages sent among routers contain
many configurable options, including:
• DR_Priority (for PIM-SM only): priority for DR election. The device with the highest priority wins the
DR election. You can configure this parameter on all the routers in a multi-access network directly
connected to multicast sources or receivers.
• Holdtime: the timeout time of PIM neighbor reachability state. When this timer times out, if the
router has received no hello message from a neighbor, it assumes that this neighbor has expired or
become unreachable.
• LAN_Prune_Delay: the delay of prune messages on a multi-access network. This option consists of
LAN-delay (namely, prune message delay), override-interval, and neighbor tracking flag. If the
LAN-delay or override-interval values of different PIM routers on a multi-access subnet are different,
the largest value will take effect. If you want to enable neighbor tracking, the neighbor tracking
feature should be enabled 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 a downstream router is allowed to 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 time 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 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), the join suppression feature should
be disabled on all PIM routers on a multi-access subnet; otherwise, the upstream router will fail to
explicitly track which downstream routers have joined to it.
Configuring hello options globally
Follow these steps to configure hello options globally:
To do... Use the command... Remarks
Enter system view system-view —
Enter public network PIM view pim —
Configure the priority for DR
election hello-option dr-priority
priority Optional
1 by default
Configure PIM neighbor timeout
time
hello-option holdtime interval
Optional
105 seconds by default
Configure the prune message
delay time (LAN-delay)
hello-option lan-delay interval
Optional
500 milliseconds by default