60
View
System view
Default level
2: System level
Parameters
None
Description
Use the dhcp relay security refresh enable command to enable the DHCP relay agent to periodically
refresh dynamic client entries.
Use the undo dhcp relay security refresh enable command 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: Specifies the refreshing interval in seconds, in the range 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 is, but the shortest interval is no less
than 500 ms.
Description
Use the dhcp relay security tracker command to set a refreshing interval at which the relay agent contacts
the DHCP server for refreshing dynamic bindings.
Use the undo dhcp relay security tracker command to restore the default interval.
The default refreshing interval is auto, the value of 60 seconds divided by the number of binding entries.
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