ProCurve 2610-PWR Technical Information download pdf (Page 291)

IP Routing Features

Configuring DHCP Relay

■ 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 the sequential index number

for that port position in the slot. (To view the Index number assign-

ments for ports in the routing switch, use the walkmib ifname

command.)

For example, the circuit ID for a client connected to port 11 on a ProCurve

2650-PWR (J8165A) switch is “11”. However, the Circuit ID for port B11

on a ProCurve 5304xl (J4850A) is “37”. (See Figure 7-13, below.)

In this example, the 5304xl has a 4-port module

installed in slot “A” and a 24-port module installed in

slot “B”. Thus, the first port numbers in the listing are

the Index numbers reserved for slot “A”. The first Index

port number for slot “B” is “27”, and the Index port

number for port B11 (and therefore the Circuit ID

number) is “37”.

The Index (and Circuit ID) number for port B11

on a 5304xl routing switch.

Figure 7-13.Using Walkmib To Determine the Circuit ID for a Port on a ProCurve Chassis

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ProCurve 2610-PWR Technical Information Page 291