Displaying DHCP option 82 information

You can use various show commands to view information about DHCP option 82 processing.

Use one of the following commands to view DHCP Option 82 processing. The commands do not need to be entered in the specified order.
  1. Enter the show ip dhcp relay information command to display information about the Circuit ID, Remote ID, and forwarding policy for DHCP Option 82. 
    device# show ip dhcp relay information
Relay Information: Format: Circuit-ID : vlan-mod-port
                            Remote-ID : mac
                               Policy : keep
  2. Enter the show ip dhcp snooping vlan command to display information about the trusted ports, untrusted ports, and ports on which DHCP Option 82 is disabled. 
    device# show ip dhcp snooping vlan 1
IP DHCP snooping VLAN 1: Enabled
  Trusted Ports :   ethe 3
  Untrusted Ports : ethe 1 to 2 ethe 4 to 24
  Relay Info. disabled Ports: ethe 10
  3. Enter the show interfaces ethernet command. 
    device# show interfaces ethernet 3
GigabitEthernet3 is up, line protocol is up
Port up for 40 minutes 10 seconds
  Hardware is GigabitEthernet, address is 0000.0000.0002 (bia 0000.0000.0002)
  Configured speed auto, actual 1Gbit, configured duplex fdx, actual fdx
  Configured mdi mode AUTO, actual MDI
  Member of L2 VLAN ID 1, port is untagged, port state is FORWARDING
  BPDU guard is Disabled, ROOT protect is Disabled
  Link Error Dampening is Disabled
  STP configured to ON, priority is level0
  Flow Control is config enabled, oper enabled, negotiation disabled
  mirror disabled, monitor disabled
  Not member of any active trunks
  Not member of any configured trunks
  No port name
  IPG MII 96 bits-time, IPG GMII 96 bits-time
  IP MTU 1500 bytes
  300 second input rate: 0 bits/sec, 0 packets/sec, 0.00% utilization
  300 second output rate: 264 bits/sec, 0 packets/sec, 0.00% utilization
  0 packets input, 0 bytes, 0 no buffer
  Received 0 broadcasts, 0 multicasts, 0 unicasts
  0 input errors, 0 CRC, 0 frame, 0 ignored
  0 runts, 0 giants
  0 packets output, 0 bytes, 0 underruns
  Transmitted 0 broadcasts, 0 multicasts, 0 unicasts
  0 output errors, 0 collisions
     Relay Agent Information option: Enabled, Subscriber-ID: Brocade001
    The output shows the DHCP option 82 enabled on the device and the configured Subscriber ID to be Brocade001.
    NOTE
    The port up or down time is required only for physical ports and not for loopback, ve, or tunnel ports.
Parent topic: DHCP option 82 configuration