Cisco Systems OL-4580-01 manual Adding a Dhcp Destination on a Circuit

Chapter 8 Configuring the DHCP Relay Agent

Adding a DHCP Destination on a Circuit

Adding a DHCP Destination on a Circuit

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-tocommand 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

Enabling and Disabling DHCP on the Circuit

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-agentcommand 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

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