Using The Set Dhcp Relay Agent Command To Enable Option 82 Suboption Support - Juniper JUNOSE SOFTWARE 11.2.X - BROADBAND ACCESS CONFIGURATION GUIDE 7-20-2010 Configuration Manual

JunosE 11.2.x Broadband Access Configuration Guide
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Using the set dhcp relay agent Command to Enable Option 82 Suboption Support

NOTE: The set dhcp relay agent command, when used to configure option 82 suboptions
is a legacy command, which JunosE Software continues to support to provide
backward-compatibility for existing scripts. We recommend that you use the dhcp relay
agent sub-option command for new option 82 suboption configurations.
You can use the set dhcp relay agent command to enable support for DHCP relay agent
option, which includes the option 82 suboptions—Agent Circuit ID (suboption 1) and
Agent Remote ID (suboption 2). This command does not support the Vendor-Specific
option (suboption 9).
The suboptions include information from the DHCP relay agent that the DHCP server
can use to implement parameter assignment policies. The DHCP server echoes the
suboptions when it replies to the client—the DHCP relay agent can optionally strip the
option 82 information before relaying the packets to the client. (Use the CLI command
set dhcp relay preserve-trusted-client-option to configure this behavior for trusted
clients.)
When you issue the set dhcp relay agent command, the router adds the configured DHCP
relay agent information suboptions to every packet it relays from a DHCP client to a DHCP
server.
The circuit-id-only keyword specifies the Agent Circuit ID suboption, which contains the
following information, based on interface type. This keyword disables support for the
Agent Remote ID suboption.
ATM interface
[<hostname>|<vrname>:]<interface type> <slot>/<port>[.<sub-if>]:<vpi>.<vci>
Examples:
atm 4/1.2:0.101
relayVr:atm 4/1:0.101
bostonHost:atm 4/1.2:0.101
Ethernet interface
[<hostname>|<vrname>:]<interface type> <slot>/<port>
Examples:
fastEthernet 1/2
relayVr:fastEthernet 1/2
bostonHost:fastEthernet 1/2
Ethernet interface with VLAN
[<hostname>|<vrname>:]<interface type> <slot>/<port>[.<sub-if>]:<vlan id>
Examples:
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