IP Routing Features
Configuring DHCP Relay
Option 82 Field Content
The Remote ID and Circuit ID subfields comprise the Option 82 field a relay
agent appends to client requests. A DHCP server configured to apply a
different IP addressing policy to different areas of a network uses the values
in these subfields to determine which DHCP policy to apply to a given client
request.
■ 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.
Switch MAC Address
Figure 7-12.Using the CLI To View the Switch MAC Address
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