•
Agent Remote ID (suboption 2)—An ASCII string assigned by the DHCP relay agent
that securely identifies the client.
You can configure the option 82 support globally or for a named group of interfaces.
To restore the default behavior, in which option 82 information is not inserted into DHCP
packets, you use the delete relay-option-82 statement.
NOTE: The DHCPv6 relay agent provides similar Agent Circuit ID and Agent
Remote ID support for DHCPv6 clients. For DHCPv6, subscriber management
uses DHCPv6 option 18 to include the circuit ID in the packets that the relay
agent sends to a DHCPv6 server, and option 37 to include the remote ID in
the packets. See DHCPv6 Relay Agent Options.
The following sections describe the option 82 operations you can configure:
•
Configuring Option 82 Information on page 61
•
Including a Prefix in DHCP Options on page 63
•
Including a Textual Description in DHCP Options on page 65
Configuring Option 82 Information
You use the relay-option-82 statement to configure the DHCP relay agent to insert option
82 information in DHCP packets that the relay agent receives from clients and forwards
to a DHCP server. When you configure option 82, you can include one of the suboption
statements to specify the type of information you want to include in the DHCP packets.
If you configure option 82 without including one of the suboption statements, the Agent
Circuit ID option is included by default. Use the circuit-id statement to include the Agent
Circuit ID (suboption 1) in the packets, or the remote-id statement to include the Agent
Remote ID (suboption 2).
You can optionally configure DHCP relay agent to include a prefix or the interface
description as part of the suboption information. If you specify the circuit-id or remote-id
statement without including any of the optional prefix, use-interface-description,
use-vlan-id, include-irb-and-l2, or no-vlan-interface-name statements, the format of the
Agent Circuit ID or Agent Remote ID information for Fast Ethernet (fe), Gigabit Ethernet
(ge), and integrated routing and bridging (irb) interfaces is one of the following, depending
on your network configuration:
•
For Fast Ethernet or Gigabit Ethernet interfaces that do not use VLANs, stacked VLANs
(S-VLANs), or bridge domains:
(fe | ge)-fpc/pic/port.subunit
NOTE: For remote systems, the subunit is required and is used to
differentiate an interface.
•
For Fast Ethernet or Gigabit Ethernet interfaces that use VLANs:
61Copyright © 2017, Juniper Networks, Inc.
Chapter 4: DHCP Relay Agent
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