1105| DHCP with Vendor-Specific Options AOS-W 6.5.3.x| User Guide
Figure 236 DHCP Scope Values
Enabling DHCP Relay Agent Information Option (Option-82)
The DHCP Relay Agent Information option (Option-82) allows the DHCP Relay Agent to insert circuit specific
information into a request that is being forwarded to a DHCP server.
The switch, when acting as a DHCP relay agent, inserts information about the AP and SSID through which a
client connects to the DHCP request. Many service providers use this mechanism to make access control
decisions.
Starting from AOS-W 6.5.1, Option-82 can be customized to cater to the requirements of any Internet Service
Provider (ISP) using the Alcatel-Lucent switch. To facilitate customization using a XMLdefinition, multiple
parameters for Circuit IDand Remote ID options of DHCPOption-82 have been introduced. The XMLfile is
used as the input from the user and is validated against anXSDfile in the switch. The format in the XMLfile is
parsed and stored in the DHCPrelay which is used to insert Option-82 related values in the DHCPrequest
packets sent from the client to the server.
DHCPOption-82 is supported only for IPv4, and applies only to AP Tunnel and D-Tunnel modes.
DHCP Option-82 on L2 VLANcan now be enabled without the helper address.
Sample XMLFormat
The following is a sample XML file which specifies DHCP Option-82 circuit and remote IDs.
<?xml version="1.0" encoding="UTF-8"?>
<dhcpopt82>
<circuit_id>
<param>
<type>var</type>
<val>apmac</val>
<delim>-</delim>
</param>
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