Dhcp Relay Check Mac-Address Aging Time - HP MSR Series Command Reference Manual

undo dhcp relay check mac-address
Default
The MAC address check function is disabled.
Views
Interface view
Predefined user roles
network-admin
Usage guidelines
This function enables the DHCP relay agent to compare the chaddr field of a received DHCP request with
the source MAC address in the frame header. If they are the same, the DHCP relay agent forwards the
request to the DHCP server. If they are not the same, the DHCP relay agent discards the request.
The MAC address check function takes effect only when the dhcp select relay command has already
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 gigabitethernet 2/0/1
[Sysname-GigabitEthernet2/0/1] 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 set 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 30 seconds.
Views
System view
Predefined user roles
network-admin
83