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IP Routing Features
Configuring DHCP Relay
Terminology
Circuit ID: In Option 82 applications, the number of the port through which
the routing switch receives a DHCP client request. On ProCurve fixed-port
switches, the Circuit ID of a given port corresponds to the port number
appearing on the front of the switch for that port. On ProCurve chassis
switches, the port number for a given port corresponds to the internal if Index
number for that port. This value is included as a suboption in an Option 82
field that the relay agent appends to a Client DHCP request before forwarding
the request toward a DHCP server. (For more on Circuit ID, refer to “Circuit
ID” in the list on page 3-53.)
DHCP Policy Boundary: For Option 82 applications, an area of a network
as defined by connection to a given routing switch or subnet and/or a specific
port belonging to the routing switch or subnet.
DHCP relay agent: See Relay Agent.
Forwarding Policy: The Option 82 method the routing switch uses to process
incoming client DHCP requests. For a given inbound DHCP client request, the
forwarding policy determines whether the routing switch will add Option 82
information, replace existing Option 82 information, or leave any existing
information unchanged. The policy also determines whether the routing
switch will forward the client request toward a DHCP server or drop the
request. For a DHCP server response to an Option 82 client request, the routing
switch can optionally perform a validation check to determine whether to
forward or drop the response. Each Option 82 relay agent in the path between
a DHCP client and an Option 82 DHCP server can be configured with a unique
forwarding policy, which enhances DHCP policy control over discrete areas
of a network.
Primary Relay Agent: In the path between a DHCP client and a DHCP server,
the first routing switch (configured to support DHCP operation) that a client
DHCP request encounters in the path from the client to a DHCP server.
Relay Agent: A routing switch that is configured to support DHCP operation.
Remote ID: In Option 82 applications on ProCurve switches, either the MAC
address of a relay agent or the IP address of a VLAN or subnet configured on
a relay agent or the (optional) Management VLAN configured on a relay agent.
This value is included as a suboption in an Option 82 field that the relay agent
appends to a Client DHCP request before forwarding the request toward a
DHCP server. (For more on Remote ID, refer to “Remote ID” in the bulleted
list on page 3-52.)
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