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Configuring hello message options on an interface
Ste
Command Remarks
1. Enter system view.
system-view
N/A
2. Enter interface view.
interface interface-type
interface-number
N/A
3. Set the DR priority.
ipv6 pim hello-option dr-priority
priority
By default, the DR priority is 1.
4. Set the neighbor lifetime.
ipv6 pim hello-option holdtime
time
By default, the neighbor lifetime is
105 seconds.
5. Set the prune delay.
ipv6 pim hello-option lan-delay
delay
By default, the prune delay is 500
milliseconds.
6. Set the override interval.
ipv6 pim hello-option
override-interval interval
By default, the override interval is
2500 milliseconds.
7. Enable the neighbor tracking
function.
ipv6 pim hello-option
neighbor-tracking
By default, the neighbor tracking
function is disabled.
8. Enable dropping hello
messages without the
Generation ID option.
ipv6 pim require-genid
By default, an interface accepts
hello message without the
Generation ID option.
Configuring common IPv6 PIM timers
IMPORTANT:
To prevent the upstream nei
hbors from a
in
out, you must confi
ure the interval for sendin
join/prune
messages to be less than the joined/pruned state holdtime timer.
IPv6 PIM routers periodically send hello messages to discover IPv6 PIM neighbors, and maintain IPv6
PIM neighbor relationship.
After receiving a hello message, an IPv6 PIM router waits for a random time period before sending a
hello message. This random time period is smaller than the maximum delay for sending hello messages.
It is used to avoid collisions when multiple IPv6 PIM routers send hello messages simultaneously.
An IPv6 PIM router periodically sends join/prune messages to its upstream routers for state update. A
join/prune message contains the joined/pruned state timeout value. This value is used by an upstream
router to determine how long it will keep the joined state or pruned state for the downstream interfaces.
When a router fails to receive subsequent IPv6 multicast data from the IPv6 multicast source S, the router
does not immediately remove the corresponding (S, G) entry. Instead, it maintains the (S, G) entry for a
period of time (namely, the IPv6 multicast source lifetime) before deleting the (S, G) entry.
You can configure common IPv6 PIM timers 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.
TIP:
For a network without special requirements, HP recommends that you use the defaults.
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