Ericsson ECN330, Руководство пользователя

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Configuring the ECN330-switch
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1553-KDU 137 365 Uen D 2006-06-16
Command Attributes
• VLAN – Selects a VLAN interface on this router.
• PIM-DM Protocol Status – Enables/disables PIM-DM.
(Default: Disabled)
• Hello Interval – Sets the frequency at which PIM hello messages are
transmitted. Hello messages are sent to neighboring PIM routers from
which this device has received probes, and are used to verify whether
or 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