HP A6600 Configuration Manual page 143

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 router 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), 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
To do...
1. Enter system view.
2. Enter public network PIM view
or VPN instance PIM view.
3. Configure the priority for DR
election.
4. Configure PIM neighbor
timeout time.
5. Configure the prune message
delay time (LAN-delay).
6. Configure the prune override
interval.
7. Disable join suppression.
Configuring hello options on an interface
To do...
1. Enter system view.
2. Enter interface view.
3. Configure the priority for DR
election.
4. Configure PIM neighbor
timeout time.
5. Configure the prune message
delay time (LAN-delay).
6. Configure the prune override
interval.
7. Disable join suppression.
Use the command...
system-view
pim [ vpn-instance
vpn-instance-name ]
hello-option dr-priority priority
hello-option holdtime interval
hello-option lan-delay interval
hello-option override-interval
interval
hello-option neighbor-tracking
Use the command...
system-view
interface interface-type
interface-number
pim hello-option dr-priority
priority
pim hello-option holdtime interval
pim hello-option lan-delay interval
pim hello-option override-interval
interval
pim hello-option neighbor-tracking
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Remarks
—
—
Optional.
1 by default.
Optional.
105 seconds by default.
Optional.
500 milliseconds by default.
Optional.
2,500 milliseconds by default.
Required.
Enabled by default.
Remarks
—
—
Optional
1 by default
Optional.
105 seconds by default.
Optional.
500 milliseconds by default.
Optional.
2,500 milliseconds by default.
Required.
Enabled by default.