MSM7xx Controllers Configuration Guide v6.4.0

3. Under Settings, define the following:
• Under Listen for requests on, select the interface on which the DHCP relay agent will listen
for requests. Enable the Client data tunnel option when the client data tunnel feature is
active on one or more VSCs, and you want tunneled users to be able to receive an IP
address via the DHCP relay agent. See Client data tunnel under “WLAN” (page 118).
• The following two fields let you attach information to the DHCP request (as defined by
DHCP relay agent information option 82) which lets the DHCP server identify the controller.
◦ Circuit ID: Use this field to identify the user that issued the DHCP request.
◦ Remote ID: Use this field to identify the controller.
You can use regular text in combination with the following placeholders to create
the information in each field. Placeholders are automatically expanded when the
request is sent. The following placeholders can be used:
– %S: SSID to which the user is associated.
– %B: BSSID to which the user is associated.
– %V: VLAN to which the user is mapped.
• Source port sets the UDP source port to use in all relayed DHCP requests. You should
leave this setting at the default value of 67, unless port 68 is specifically required by your
network.
Configuring DHCP services 49