HP MSR2003 Configuration Manual page 121

Holdtime—PIM neighbor lifetime. If a router does not receive a hello message from a neighbor
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when the neighbor lifetime expires, it regards the neighbor failed or unreachable.
LAN_Prune_Delay—Delay of forwarding prune messages on a shared-media LAN. This option
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consists of LAN delay (namely, prune message delay), override interval, and neighbor tracking
support (namely, the capability to disable join message suppression).
The prune message delay defines the delay time for a router to forward a received prune message
to the upstream routers. The override interval defines a period for a downstream router to override
a prune message. If the prune message delay or override interval on different PIM routers on a
shared-media LAN are different, the largest value takes effect.
A router does not immediately prune an interface after it receives a prune message from the
interface. Instead, it starts a timer (the prune message delay plus the override interval). If interface
receives a join message before the override interval expires, the router does not prune the
interface. Otherwise, the router prunes the interface when the timer (the prune message delay plus
the override interval) expires.
You can enable the neighbor tracking function on an upstream router to track the states of the
downstream nodes for which the joined state holdtime timer has not expired. If you want to enable
the neighbor tracking function, you must enable it on all PIM routers on a shared-media LAN.
Otherwise, the upstream router cannot track join messages from every downstream routers.
Generation ID—A router generates a generation ID for hello messages when an interface is
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enabled with PIM. The generation ID is a random value, but only changes when the status of the
router changes. 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 router has changed. In this case, it
sends a join message to the upstream router for status update. You can configure an interface to
drop hello messages without the generation ID options to promptly know the status of an upstream
router.
You can configure hello message options in PIM view or interface view. The configurations made in PIM
view are effective on all interfaces and the configurations made in interface view are effective on only the
current interface. If you configure hello message options in both PIM view and interface view, the
configuration in interface view always takes precedence.
Configuring hello message options globally
Step
1. Enter system view.
2. Enter PIM view.
3. Set the DR priority.
4. Set the neighbor lifetime.
5. Set the prune message delay.
6. Set the override interval.
7. Enable the neighbor tracking
function.
Command
system-view
pim [ vpn-instance
vpn-instance-name ]
hello-option dr-priority priority
hello-option holdtime time
hello-option lan-delay delay
hello-option override-interval
interval
hello-option neighbor-tracking
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Remarks
N/A
N/A
The default setting is 1.
The default setting is 105 seconds.
The default setting is 500
milliseconds.
The default setting is 2500
milliseconds.
By default, the neighbor tracking
function is disabled.