HP 5920 series Configuration Manual page 162

override a prune message. If the prune message delay or override interval on different IPv6 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 (or disable the join message suppression function)
on an upstream router to track the states of the downstream nodes that have sent the join message
and the joined state holdtime timer has not expired. If you want to enable the neighbor tracking
function, you must enable it on all IPv6 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 IPv6 PIM. The generation ID is a random value, but only changes when the status of
the router changes. If an IPv6 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 IPv6 PIM view or interface view. The configurations made in
IPv6 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 IPv6 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 IPv6 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.
Configuring hello message options on an interface
Step
1. Enter system view.
2. Enter interface view.
Command
system-view
ipv6 pim
hello-option dr-priority priority
hello-option holdtime time
hello-option lan-delay delay
hello-option override-interval
interval
hello-option neighbor-tracking
Command
system-view
interface interface-type
interface-number
155
Remarks
N/A
N/A
By default, the DR priority is 1.
By default, the neighbor lifetime is
105 seconds.
By default, the prune message
delay is 500 milliseconds.
By default, the override interval is
2500 milliseconds.
By default, the neighbor tracking
function is disabled.
Remarks
N/A
N/A