VERIFYING SYSTEM OPTIONS

DHCP Relay Agent

4.If an error occurred while trying to enable the Relay Agent, the following message may be displayed in the report log:

[DHCP-R] Failed to open UDP port (67), erc=<error return code>

This indicates that an internal error occurred while trying to open a UDP port for use by the DHCP/BOOTP Relay Agent. Therefore, the relay agent will not operate correctly. Contact your Distributor or Customer Support.

5.If the following message is NOT found in the report log after system initialization:

[DHCP-R] Relay Agent enabled; UDP port (67) opened

It indicates that there was no attempt made to enable the DHCP/BOOTP Relay Agent. Try the following:

a.Check the DHCP configuration. This can be done by using CFGEDIT, or by using the dhcp command from Manage Mode.

b.Make sure that the Relay Agent is enabled.

c.If desired, enter MANAGE mode, and use the dhcp change command to enable the Relay Agent. (Note: CFGEDIT can also be used to change the Relay Agent configuration; but the changes will not take effect until the system is restarted.)

d.When Manage Mode is exited, an attempt will be made to enable the Relay Agent.

e.Re-examine the report log for the “Relay Agent Enabled” message.

f.Remember to “commit” the Manage Mode configuration changes to make them permanent.

VERIFYING THE RELAY AGENT IS OPERATIONAL

Once the Relay Agent has been successfully initialized and enabled, DHCP Clients should be able to obtain their IP addresses (and other configuration parameters) from a DHCP Server.

For example purposes, assume the following diagram represents the network in which the Relay Agent is being used. This configuration is useful when a remote IP router is known to have access to a DHCP Server, but that router is not a DHCP/BOOTP Relay Agent.

DHCP Server

192.168.1.5

ISDN

192.168.1.168

IP Router ("Alex")

DHCP Client

204.157.42.168

CSX5500

IP Router w/ DHCP Relay Agent ("Ruby")

Central Site Remote Access Switch 465

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Enterasys Networks CSX5500, CSX6000, CSX7000 manual Verifying the Relay Agent is Operational