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• Configuring Agent Circuit ID Information    

Configuring Agent Circuit ID Information

You use the relay-option-82 statement to enable insertion of option 82 information in DHCP packets. You must also specify at least the circuit-id statement to include the Agent Circuit ID suboption (suboption 1) of the DHCP relay agent information option.

If you specify the circuit-id statement, the format of the Agent Circuit ID information for Fast Ethernet (fe) or Gigabit Ethernet (ge) interfaces is one of the following, depending on your network configuration:

• For Fast Ethernet or Gigabit Ethernet interfaces that do not use virtual local area networks (VLANs) or stacked VLANs (S-VLANs):

  (fe | ge)-fpc/pic/port

• For Fast Ethernet or Gigabit Ethernet interfaces that use VLANs:

  (fe | ge)-fpc/pic/port:vlan-id

• For Fast Ethernet or Gigabit Ethernet interfaces that use S-VLANs:

  (fe | ge)-fpc/pic/port:svlan-id-vlan-id

To enable insertion of option 82 information:

1. Specify that you want to configure option 82 support.

   [edit forwarding-options dhcp-relay]

   user@host# edit relay-option-82

2. Specify insertion of the Agent Circuit ID suboption.

   [edit forwarding-options dhcp-relay relay-option-82]

   user@host# set circuit-id