prefix (Circuit ID for Option 82)
For platforms with enhanced Layer 2 software (ELS):
For platforms without ELS:
For MX Series platforms:
Statement introduced in Junos OS Release 9.3 for EX Series switches.
Statement introduced in Junos OS Release 11.3 for the QFX Series.
Hierarchy level [edit vlans vlan-name forwarding-options dhcp-security option-82 circuit-id] introduced in Junos OS Release 13.2X50-D10. (See Using the Enhanced Layer 2 Software CLI for information about ELS.)
Statement introduced in Junos OS Release 14.1 for the MX Series.
Configure an optional prefix for the circuit ID suboption in the DHCP option 82 information that is inserted by the switch or router into the packet header of a DHCP request before it forwards or relays the request to a DHCP server.
If the prefix statement is not explicitly specified, no prefix is prepended to the circuit ID.
This option is not used for the prefix statement at any of the above hierarchy levels.
This option is not used for the prefix statement occurring at the following hierarchy levels:
Required Privilege Level
system—To view this statement in the configuration.
system-control—To add this statement to the configuration.
RFC 3046, DHCP Relay Agent Information Option, at http://tools.ietf.org/html/rfc3046.