Related Topics
Example: Setting Up DHCP Option 82 on an EX-series Switch with No Relay Agent Between Clients and DHCP Server
Example: Setting Up DHCP Option 82 with an EX-series Switch as Relay Agent Between Clients and a DHCP Server
Setting Up DHCP Option 82 on the Switch with No Relay Agent Between Clients and DHCP Server (CLI Procedure)
Setting Up DHCP Option 82 with the Switch as a Relay Agent Between Clients and DHCP Server (CLI Procedure)
[edit forwarding options] Configuration Statement Hierarchy
RFC 3046, DHCP Relay Agent Information Option, at http://tools.ietf.org/html/rfc3046.

circuit-id

Syntax



circuit-id {
                     
prefix hostname;
                     
use-interface-description;
                     
use-vlan-id;
}

Hierarchy Level



[edit ethernet-switching-options                 secure-access-port                 vlan (all
| vlan-name) dhcp-option82]
[edit forwarding-options helpers bootp dhcp-option82] 
[edit forwarding-options helpers bootp interface interface-name                 dhcp-option82]

Release Information

Statement introduced in JUNOS Release 9.3 for EX-series switches.

Description

Configure the circuit-id suboption (suboption 1) of DHCP option 82 (the DHCP relay agent information option) in DHCP packets destined for a DHCP server. This suboption identifies the circuit (interface and/or VLAN) on which the DHCP request arrived.

The format of the circuit-id information for Gigabit Ethernet interfaces that use VLANs is interface-name:vlan-name . On a Layer 3 interface, the format is just interface-name.

The remaining statements are explained separately.

Default

If DCHP option 82 is enabled on the switch, the circuit ID is supplied by default in the format interface-name:vlan-name or, on a Layer 3 interface, just interface-name .

Required Privilege Level

routing—To view this statement in the configuration.

routing-control—To add this statement to the configuration.