R211x-HP Flexfabric 11900 Layer 3 - IP Services Command Reference

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The MAC address check function takes effect only when the dhcp select relay command has been
configured on the interface.
Enable the MAC address check function only on the DHCP relay agent directly connected to the DHCP
clients. A DHCP relay agent changes the source MAC address of DHCP packets before sending them. If
you enable this feature on an intermediate relay agent, it might discard valid DHCP packet, and the
sending clients will not obtain IP addresses.
Examples
# Enable MAC address check on the relay agent.
<Sysname> system-view
[Sysname] interface vlan-interface 10
[Sysname-Vlan-interface10] dhcp relay check mac-address
Related commands
dhcp select relay
dhcp relay check mac-address aging time
Use dhcp relay check mac-address aging time to configure the aging time for MAC address check
entries on the DHCP relay agent.
Use undo dhcp relay check mac-address aging time to restore the default.
Syntax
dhcp relay check mac-address aging-time time
undo dhcp relay check mac-address aging-time
Default
The aging time is 300 seconds.
Views
System view
Predefined user roles
network-admin
mdc-admin
Parameters
time: Specifies the aging time for MAC address check entries in seconds, in the range of 30 to 600.
Usage guidelines
This command takes effect only after you execute the dhcp relay check mac-address command.
Examples
# Set the aging time for MAC address check entries on the DHCP relay agent to 60 seconds.
<Sysname> system-view
[Sysname] dhcp relay check mac-address aging-time 60