2-4
Description
Use the ndp timer aging command to set the holdtime of the NDP information. This command
specifies how long an adjacent device should hold the NDP neighbor information received from the
local switch before discarding the information.
Use the undo timer aging command to restore the default holdtime of NDP information.
By default, the holdtime of NDP information is 180 seconds.
You can specify how long the adjacent devices should hold the NDP information received from the local
switch. When an adjacent device receives an NDP packet from the local switch, it learns how long it
should keep the NDP information of the switch according to the holdtime carried in the NDP packet, and
discards the NDP information when the holdtime expires.
Note that NDP information holdtime should be longer than the interval between sending NDP packets.
Otherwise, a neighbor entry will be generated and age out frequently, resulting in instability of the NDP
port neighbor table.
Examples
# Set the holdtime of the NDP information sent by the switch to 60 seconds.
<Sysname> system-view
System View: return to User View with Ctrl+Z.
[Sysname] ndp timer aging 60
ndp timer hello
Syntax
ndp timer hello timer-in-seconds
undo ndp timer hello
View
System view
Parameters
timer-in-seconds: Interval between sending NDP packets, ranging from 5 to 254 seconds.
Description
Use the ndp timer hello command to set the interval between sending NDP packets.
Use the undo ndp timer hello command to restore the default interval.
By default, this interval is 60 seconds.
A switch should update the NDP information of its neighbors regularly, so that the switch can get the
updated information of the neighbors in time. You can use the ndp timer hello command to specify the
interval at which the switch sends hello packets to its neighbors for NDP information update.
Note that NDP information holdtime should be longer than the interval between sending NDP packets.
Otherwise, a neighbor entry will be generated and age out frequently, resulting in instability of the NDP
port neighbor table.
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