H3C S7500E Series Ethernet Switches Operation Manual

Operation Manual – Multicast
H3C S7500E Series Ethernet Switches Chapter 5 PIM Configuration
5-36
To do... Use the command... Remarks
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
5.5.5 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
maintains (S, G) entries for a period of time, namely the multicast source lifetime,
before deleting the (S, G) entries.
I. Configuring PIM common timers globally
Follow these steps to configure PIM common timers globally: