Operation Manual – Multicast Protocol
H3C S3610&S5510 Series Ethernet Switches
Chapter 6 PIM Configuration
6-36
To do...
Use the command...
Remarks
Enter system view
system-view
—
Enter Ethernet port view
interface interface-type
interface-number
—
Configure the priority for
DR election
pim hello-option
dr-priority
priority
Optional
1 by default
Configure PIM neighbor
timeout time
pim hello-option
holdtime
interval
Optional
105 seconds by default
Configure the prune delay
time (LAN-delay)
pim hello-option
lan-delay
interval
Optional
500 milliseconds by
default
Configure the prune
override interval
pim hello-option
override-interval
interval
Optional
2,500 milliseconds by
default
Disable join suppression
pim hello-option
neighbor-tracking
Optional
Enabled by default
Configure the interface to
reject hello messages
without a generation ID
pim require-genid
Optional
By default, hello
messages without
Generation_ID are
accepted
6.5.5 Configuring PIM Common Timers
PIM routers discover PIM neighbors and maintain PIM neighboring relationships with
other routers by periodically sending out hello messages.
Upon receiving a hello message, a PIM router waits a random period, which is equal to
or smaller than the maximum delay between hello messages, before sending out a
hello message. This avoids collisions that occur when multiple PIM routers send hello
messages simultaneously.
Any router that has lost assert election will prune its downstream interface and maintain
the assert state for a period of time. When the assert state times out, the assert losers
will resume multicast forwarding.
A PIM router periodically sends join/prune messages to its upstream for state update. A
join/prune message contains the join/prune timeout time. The upstream router sets a
join/prune timeout timer for each pruned downstream interface, and resumes the
forwarding state of the pruned interface when this timer times out.
When a router fails to receive subsequent multicast data from the multicast source S,
the router will not immediately delete the corresponding (S, G) entries; instead, it
