HP 3500YL - Manual (Page 313)

IP Routing Features
Configuring DHCP Relay
• Use the Management VLAN option if a Management VLAN is config­
ured and you want all DHCP clients on the routing switch to use the
same IP address. (This is useful if you are applying the same IP
addressing policy to DHCP client requests from ports in different
VLANs on the same routing switch.) Configuring this option means
the Management VLAN’s IP address appears in the remote ID subfield
of all DHCP requests originating with clients connected to the routing
switch, regardless of the VLAN on which the requests originate.
• 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.
Switch MAC Address
Figure 5-64. 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
5-139