SMC Networks SMC6724L3 Management Manual page 282

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ONFIGURING THE
not these neighbors are still active members of the multicast tree. (Range:
1-65535 seconds; Default: 30)
• Hello Holdtime – Sets the interval to wait for hello messages from a
neighboring PIM router before declaring it dead. Note that the hello
holdtime should be 3.5 times the value of Hello Interval.
(Range: 1-65535 seconds; Default: 105)
• Trigger Hello Interval – Configures the maximum time before
transmitting a triggered PIM hello message after the router is rebooted or
PIM is enabled on an interface. (Range: 1-65535 seconds; Default: 5)
- When a router first starts or PIM is enabled on an interface, the
hello-interval is set to random value between 0 and the Trigger Hello
Interval. This prevents synchronization of Hello messages on
multi-access links if multiple routers are powered on simultaneously.
- Also, if a Hello message is received from a new neighbor, the receiving
router will send its own Hello message after a random delay between 0
and the Trigger Hello Interval.
• Prune Holdtime – Configures of the hold time for the prune state. The
multicast interface that first receives a multicast stream from a particular
source forwards this traffic to all other PIM interfaces on the router. If
there are no requesting groups on that interface, the leaf node sends a
prune message upstream and enters a prune state for this multicast
stream. The prune state is maintained until the prune holdtime timer
expires or a graft message is received for the forwarding entry.
(Range: 1-65535 seconds; Default: 210)
• Graft Retry Interval – Configures the time to wait for a graft
acknowledgement before resending a graft. A graft message is sent by a
router to cancel a prune state. When a router receives a graft message, it
must respond with an graft acknowledgement message. If this
acknowledgement message is lost, the router that sent the graft message
will resend it a maximum number of times as defined by Max Graft
Retries. (Range: 1-65535 seconds; Default: 3)
• Max Graft Retries – Configures the maximum number of times to
resend a graft message if it has not been acknowledged. (Range: 1-65535;
Default: 2)
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