R3721-F3210-F3171-HP High-End Firewalls Network Management Command Reference-6PW101

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Description
Use dhcp relay security refresh enable to enable the DHCP relay agent to periodically refresh dynamic
client entries.
Use undo dhcp relay security refresh enable to disable periodic refresh of dynamic client entries.
By default, the DHCP relay agent is enabled to periodically refresh dynamic client entries.
If you disable the DHCP relay agent from periodically refreshing dynamic client entries, such entries do
not age automatically. Therefore, if a client relinquishes its IP address, you need to manually remove the
corresponding dynamic client entry on the DHCP relay agent.
Related commands: dhcp relay security tracker and dhcp relay security static.
Examples
# Disable the DHCP relay agent from periodically refreshing dynamic client entries.
<Sysname> system-view
[Sysname] undo dhcp relay security refresh enable
dhcp relay security tracker
Syntax
dhcp relay security tracker { interval | auto }
undo dhcp relay security tracker [ interval ]
View
System view
Default level
2: System level
Parameters
interval: Refreshing interval in seconds, in the range of 1 to 120.
auto: Specifies the auto refreshing interval, which is the value of 60 seconds divided by the number of
binding entries. The more entries there are, the shorter the interval. The shortest interval is no less than
500 ms.
Description
Use dhcp relay security tracker to set a refreshing interval at which the relay agent contacts the DHCP
server for refreshing dynamic bindings.
Use undo dhcp relay security tracker to restore the default interval.
The default refreshing interval is auto, the value of 60 seconds divided by the number of binding entries.
Related commands: display dhcp relay security tracker.
Examples
# Set the refreshing interval as 100 seconds.
<Sysname> system-view
[Sysname] dhcp relay security tracker 100