Dhcp Relay Server-Detect - H3C S5120-SI Series Command Reference Manual

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. Thus, the more entries are, the shorter 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.
Related commands: display dhcp relay security tracker.
Examples
# Set the refreshing interval as 100 seconds.
<Sysname> system-view
[Sysname] dhcp relay security tracker 100

dhcp relay server-detect

Syntax
dhcp relay server-detect
undo dhcp relay server-detect
View
System view
Default Level
2: System level
Parameters
None
Description
Use the dhcp relay server-detect command to enable unauthorized DHCP server detection.
Use the undo dhcp relay server-detect command to disable unauthorized DHCP server detection.
By default, unauthorized DHCP server detection is disabled.
With this function enabled, upon receiving a DHCP request, the DHCP relay agent will record the IP
addresses of all DHCP servers which ever offered IP addresses to the DHCP client and the receiving
interface. Each server detected is recorded only once. The administrator can get this information from
logs to check out unauthorized DHCP servers.
After the information of recorded DHCP servers is cleared, the relay agent will re-record server
information following this mechanism.
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