Technical Documentation

prefix (DHCP Relay Agent)

Syntax

prefix prefix;

Hierarchy Level

[edit forwarding-options dhcp-relay relay-option-82 circuit-id],[edit forwarding-options dhcp-relay group group-name relay-option-82 circuit-id],[edit logical-systems logical-system-name forwarding-options dhcp-relay relay-option-82 circuit-id],[edit logical-systems logical-system-name forwarding-options dhcp-relay group group-name relay-option-82 circuit-id],[edit logical-systems logical-system-name routing-instances routing-instance-name forwarding-options dhcp-relay relay-option-82 circuit-id],[edit logical-systems logical-system-name routing-instances routing-instance-name forwarding-options dhcp-relay group group-name relay-option-82 circuit-id],[edit routing-instances routing-instance-name forwarding-options dhcp-relay relay-option-82 circuit-id],[edit routing-instances routing-instance-name forwarding-options dhcp-relay group group-name relay-option-82 circuit-id]

Release Information

Statement introduced in JUNOS Release 8.3.

Description

Add a prefix to the base option 82 Agent Circuit ID information in DHCP packets destined for a DHCP server. The prefix can consist of any combination of the hostname, logical system name, and routing instance name.

If you include only the hostname, only the logical system name, or only the routing instance name in the prefix, the format of the Agent Circuit ID information for Fast Ethernet or Gigabit Ethernet interfaces with stacked virtual LANs (S-VLANs) is one of the following:

host-name:(fe | ge)-fpc/pic/port:svlan-id-vlan-idlogical-system-name:(fe | ge)-fpc/pic/port:svlan-id-vlan-idrouting-instance-name:(fe | ge)-fpc/pic/port:svlan-id-vlan-id

If you include both the logical system name and the routing instance name in the prefix, the format of the Agent Circuit ID information for Fast Ethernet or Gigabit Ethernet interfaces with S-VLANs is as follows:

logical-system-name;routing-instance-name:(fe | ge)-fpc/pic/port:svlan-id-vlan-id

If you include the hostname, logical system name, and routing instance name in the prefix, the format of the Agent Circuit ID information for Fast Ethernet or Gigabit Ethernet interfaces with S-VLANs is as follows:

host-name/logical-system-name;routing-instance-name:(fe | ge)-fpc/pic/port:svlan-id-vlan-id

For Fast Ethernet or Gigabit Ethernet interfaces that use virtual LANs (VLANs) but not S-VLANs, only the vlan-id value appears in the Agent Circuit ID format. For Fast Ethernet or Gigabit Ethernet interfaces that do not use VLANs or S-VLANs, neither the vlan-id value nor the svlan-id value appears.

Options

prefix—Any combination of the following:

  • host-name—Prepend the hostname of the router configured with the host-name statement at the [edit system] hierarchy level to the Agent Circuit ID information.
  • logical-system-name—Prepend the name of the logical system to the Agent Circuit ID information.
  • routing-instance-name—Prepend the name of the routing instance to the Agent Circuit ID information.

Required Privilege Level

interface—To view this statement in the configuration.

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


Published: 2010-04-15