HP 6125G HP 6125G & 6125G/XG Blade Switches Layer 3 - IP Services Comm - Page 31

dhcp relay address-check enable, dhcp relay check mac-address

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Use undo dhcp enable to disable DHCP. By default, DHCP is disabled. Examples # Enable DHCP. system-view [Sysname] dhcp enable dhcp relay address-check enable Syntax dhcp relay address-check enable View undo dhcp relay address-check enable Interface view Default level 2: System level Parameters None Description Use dhcp relay address-check enable to enable address check on the relay agent. Use undo dhcp relay address-check enable to disable address check on the relay agent. By default, the function is disabled. With this feature enabled, the DHCP relay agent can dynamically record clients' IP-to-MAC bindings after clients get IP addresses through DHCP. It also supports static bindings. You can manually configure IP-to-MAC bindings on the DHCP relay agent, so that users can access external networks using fixed IP addresses. Upon receiving an ARP packet, the DHCP relay agent matches the sender's IP and MAC addresses in the packet against the bindings (both dynamic and static). If no match is found, the DHCP relay agent does not learn the ARP entry. The sending host cannot access external networks via the DHCP relay agent. This command can be executed only on VLAN interfaces. The dhcp relay address-check enable command only checks IP and MAC addresses of clients. Examples # Enable address check on the DHCP relay agent. system-view [Sysname] interface vlan-interface 1 [Sysname-Vlan-interface1] dhcp relay address-check enable dhcp relay check mac-address Syntax dhcp relay check mac-address 24

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24
Use
undo dhcp enable
to disable DHCP.
By default, DHCP is disabled.
Examples
# Enable DHCP.
<Sysname> system-view
[Sysname] dhcp enable
dhcp relay address-check enable
Syntax
dhcp relay address-check
enable
undo dhcp relay address-check
enable
View
Interface view
Default level
2: System level
Parameters
None
Description
Use
dhcp relay address-check enable
to enable address check on the relay agent.
Use
undo dhcp relay address-check
enable
to disable address check on the relay agent.
By default, the function is disabled.
With this feature enabled, the DHCP relay agent can dynamically record clients’ IP-to-MAC bindings
after clients get IP addresses through DHCP. It also supports static bindings. You can manually configure
IP-to-MAC bindings on the DHCP relay agent, so that users can access external networks using fixed IP
addresses.
Upon receiving an ARP packet, the DHCP relay agent matches the sender’s IP and MAC addresses in the
packet against the bindings (both dynamic and static). If no match is found, the DHCP relay agent does
not learn the ARP entry. The sending host cannot access external networks via the DHCP relay agent.
This command can be executed only on VLAN interfaces.
The
dhcp relay address-check enable
command only checks IP and MAC addresses of clients.
Examples
# Enable address check on the DHCP relay agent.
<Sysname> system-view
[Sysname] interface vlan-interface 1
[Sysname-Vlan-interface1] dhcp relay address-check enable
dhcp relay check mac-address
Syntax
dhcp relay check mac-address