H3C Technologies H3C S12500-X Series Switches - Manual (Page 94)

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Step Command Remarks
6. Set the override interval.
hello-option override-interval
interval The default setting is 2500
milliseconds.
7. Enable the neighbor tracking
function.
hello-option neighbor-tracking
By default, the neighbor tracking
function is disabled.
Configuring hello message options on an interface
Step 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. pim hello-option dr-priority priority The default setting is 1.
4. Set the neighbor lifetime. pim hello-option holdtime time The default setting is 105 seconds.
5. Set the prune delay. pim hello-option lan-delay delay
The default setting is 500
milliseconds.
6. Set the override interval.
pim hello-option override-interval
interval
The default setting is 2500
milliseconds.
7. Enable the neighbor tracking
function.
pim hello-option neighbor-tracking
By default, the neighbor tracking
function is disabled.
8. Enable dropping hello
messages without the
Generation ID option.
pim require-genid
By default, an interface accepts
hello messages without the
Generation ID option.
Configuring common PIM timers
CAUTION:
To prevent the upstream neighbors from aging out, you must configure the interval for sending join/prune
message less than the joined/pruned state holdtime timer.
PIM routers periodically send hello messages to discover PIM neighbors, and maintain PIM neighbor
relationship.
After receiving a hello message, a PIM router waits for a random time period before sending its own hello
message. This random time period is smaller than the maximum delay for sending hello messages, and
it can avoid collisions that might occur when multiple PIM routers send hello messages simultaneously.
A PIM router periodically sends join/prune messages to its upstream routers for state update. A
join/prune message contains the joined/pruned state holdtime value, and an upstream router uses this
value to set a holdtime timer for the joined state or pruned state of the downstream interfaces.
When a router fails to receive subsequent multicast data from the 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 (known as, the multicast source lifetime) before deleting the (S, G) entry.
You can configure common PIM timers in PIM view or interface view. The configurations made in PIM
view are effective on all interfaces. The configurations made in interface view are effective on only the