HP ProCurve 6200yl Multicast And Routing Manual page 242

IP Routing Features
Configuring DHCP Relay
5-82
Remote ID: This configurable subfield identifies a policy area that
■
comprises either the routing switch as a whole (by using the routing
switch MAC address) or an individual VLAN configured on the routing
switch (by using the IP address of the VLAN receiving the client request).
• Use the IP address option if the server will apply different IP
addressing policies to DHCP client requests from ports in different
VLANs on the same routing switch.
• Use the MAC address option if, on a given routing switch, it does not
matter to the DHCP server which VLAN is the source of a client
request (that is, use the MAC address option if the IP addressing
policies supported by the target DHCP server do not distinguish
between client requests from ports in different VLANs in the same
routing switch)
To view the MAC address for a given routing switch, execute the show
system-information command in the CLI.
Figure 5-33. Using the CLI To View the Switch MAC Address
■ Circuit ID: This nonconfigurable subfield identifies the port number of
the physical port through which the routing switch received a given DHCP
client request, and is necessary to identify if you want to configure an
Option 82 DHCP server to use the Circuit ID to select a DHCP policy to
assign to clients connected to the port. This number is the identity of the
inbound port. On ProCurve fixed-port switches, the port number used for
the Circuit ID is always the same as the physical port number shown on
the front of the switch. On ProCurve chassis switches, where a dedicated,
sequential block of internal port numbers are reserved for each slot,
regardless of whether a slot is occupied, the circuit ID for a given port is
Switch MAC Address