Cisco Systems OL-8241-02 Manual De Usuario

A CSS circuit acts as the DHCP relay agent. For each circuit on the CSS, you can 
configure a maximum of five DHCP destinations. The initial DHCP broadcast 
request is sent to all of the configured destinations.

Do not configure a relay destination on a circuit when the relay destination is 
directly connected to or reachable from one of the ports on the same circuit. In 
this case, the DHCP packets reach the relay destination through normal broadcast 
and a relay agent is not required.

Use the dhcp relay-to command to specify the DHCP relay destination address. 
This command is available in circuit configuration mode. Enter an IP address in 
dotted-decimal notation.

For example, to add a destination address of 192.168.22.25 to a DHCP server, 
enter:

(config-circuit[VLAN2])# dhcp relay-to 192.168.22.25

To remove the relay destination address, enter:

(config-circuit[VLAN2])# no dhcp relay-to 192.168.22.25

After you enable the DHCP relay agent on the CSS circuit, the CSS transfers 
DHCP messages between DHCP clients and servers. Use the dhcp-relay-agent 
command to enable the agent on the circuit. This command is available in circuit 
configuration mode. 

For example:

(config-circuit[VLAN2])# dhcp-relay-agent

To disable the DHCP relay agent on the circuit, enter:

(config-circuit[VLAN2])# no dhcp-relay-agent