the circuit ID for a given port is the sequential index number for that port position in the slot. (To view the index
number assignments for ports in the routing switch, use the
walkmib ifname
command.)
Using
walkmib
to determine the circuit ID for a port on a chassis
For example, the circuit ID for port B11 on a switch is "35”, as shown in the following example.
For example, suppose you want port 10 on a given relay agent to support no more than five DHCP clients
simultaneously. You can configure the server to allow only five IP addressing assignments at any one time for the
circuit ID (port) and remote ID (MAC address) corresponding to port 10 on the selected relay agent.
Similarly, if you want to define specific ranges of addresses for clients on different ports in the same VLAN, you
can configure the server with the range of IP addresses allowed for each circuit ID (port) associated with the
remote ID (IP address) for the selected VLAN.
Forwarding policies
DHCP Option 82 on switches offers four forwarding policies, with an optional validation of server responses for
three of the policy types (
append
,
replace
, or
drop
.)
Configuration options for managing DHCP client request packets:
Chapter 14 Dynamic Host Configuration Protocol
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