HPE 5900 series

63
Syntax
dhcp relay check mac-address
undo dhcp relay check mac-address
Default
The MAC address check feature is disabled.
Views
Interface view
Predefined user roles
network-admin
Usage guidelines
This feature 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 feature takes effect only when the dhcp select relay command has
already been configured on the interface.
Enable the MAC address check feature 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 30 seconds.
Views
System view
Predefined user roles
network-admin