3-14
Description
Use the pim timer hello command to configure the PIM Hello interval on the current interface.
Use the undo pim timer hello command to restore the default.
By default, an interface sends Hello messages at the interval of 30 seconds.
After PIM-SM is enabled on an interface, the switch periodically sends Hello messages to all the
PIM-capable devices to discover PIM neighbors. If the interface receives Hello messages, it means that
the interface is connected to neighboring network devices that support PIM, and the interface will add
the neighbors to its own neighbor list. If the interface receives no Hello messages from a neighbor in its
neighbor list within the specified time, the neighbor is considered to have expired or failed.
Examples
# Configure VLAN-interface 10 of the switch to send Hello messages at the interval of 40 seconds.
<Sysname> system-view
System View: return to User View with Ctrl+Z.
[Sysname] multicast routing-enable
[Sysname] interface Vlan-interface 10
[Sysname-Vlan-interface10] pim timer hello 40
prune delay
Syntax
prune delay interval
undo prune delay
View
PIM view
Parameters
interval: Specifies the prune delay interval in seconds, in the rage of 1 to 128.
Description
Use the prune delay command to configure the PIM prune delay interval.
Use the undo prune delay command to restore the default PIM prune delay interval.
By default, the PIM prune delay interval is 5 seconds.
Upon receiving a prune message from a downstream node, the upstream node does not take a prune
action immediately; instead, it maintains the forwarding state of the interface to the downstream. If the
upstream node receives a prune override message from the downstream node within the prune delay
interval, it cancels the prune action; otherwise, it prunes the interface to the downstream when the
prune delay times out.
The PIM prune delay function is applicable only to PIM-SM networks, but not to PIM-DM networks.
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