HP ProCurve Series 3400cl Release Notes page 53

Syntax: dhcp-relay option 82 < append | replace | drop > [ validate ] [ ip | mac | mgmt-vlan ]
[ ip | mac | mgmt-vlan ] : Specifies the remote ID suboption the routing switch will use
in Option 82 fields added or appended to DHCP client packets. The choice depends
on how you want to define DHCP policy areas in the client requests sent to the DHCP
server. If a remote ID suboption is not configured, then the routing switch defaults
to the mac option.
mgmt-vlan: Specifies the IP address of the (optional) Management VLAN configured
on the routing switch. Requires that a Management VLAN is already configured on
the switch. If the Management VLAN is multinetted, then the primary IP address
configured for the Management VLAN is used for the remote ID.
ip: Specifies the IP address of the VLAN on which the client DHCP packet enters the
routing switch. In the case of a multinetted VLAN, the remote ID suboption uses the
IP address of the subnet on which the client request packet is received.
mac: Specifies the routing switch's MAC address. (The MAC address used is the same
MAC address that is assigned to all VLANs configured on the routing switch.)
(Default: mac)
Example
In the routing switch shown below, option 82 has been configured with mgmt-vlan for the Remote ID.
ProCurve(config)# dhcp-relay option 82 append mgmt-vlan
The resulting effect on DHCP operation for clients X, Y, and Z is shown
DHCP Server "A"
DHCP Server "B"
DHCP Server "C"
Figure 12. DHCP Option 82 When Using the Management VLAN as the Remote ID Suboption
Routing Switch
Management VLAN
VLAN 300
10.39.10.1 (secondary IP)
10.38.10.1 (primary IP)
VLAN 200
10.29.10.1
10.28.10.1
VLAN 100
10.15.10.1
Release M.08.94 Enhancements
inTable 3.
Client "X" On a routing switch that is
the primary DHCP relay
agent for a given client, if
the (optional) Management
VLAN is selected as the
Remote ID suboption and is
Client "Y"
also multinetted, then the
Remote ID for the client
DHCP requests is the
primary IP address of the
Client "Z"
Management VLAN.
Enhancements
43