Cisco Catalyst 3750-X Command Reference

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Catalyst 3750-X and 3560-X Switch Command Reference
OL-29704-01
Chapter 2 Catalyst 3750-X and 3560-X Switch Cisco IOS Commands
ip dhcp snooping vlan information option format-type circuit-id string
ip dhcp snooping vlan information option format-type circuit-id
string
Use the ip dhcp snooping vlan information option format-type circuit-id string interface
configuration command on the switch stack or on a standalone switch to configure the option-82
circuit-ID suboption. Use the no form of this command to configure the default circuit-ID suboption.
ip dhcp snooping vlan vlan information option format-type circuit-id [override] string
ASCII-string
no ip dhcp snooping vlan vlan information option format-type circuit-id [override] string
Syntax Description
Defaults The switch VLAN and the port identifier, in the format vlan-mod-port, is the default circuit ID.
Command Modes Interface configuration
Command History
Usage Guidelines You must globally enable DHCP snooping by using the ip dhcp snooping global configuration
command for any DHCP snooping configuration to take effect.
When the option-82 feature is enabled, the default circuit-ID suboption is the switch VLAN and the port
identifier, in the format vlan-mod-port. This command allows you to configure a string of ASCII
characters to be the circuit ID. When you want to override the vlan-mod-port format type and instead
use the circuit-ID to define subscriber information, use the override keyword.
Note When configuring a large number of circuit IDs on a switch, consider the impact of lengthy character
strings on the NVRAM or flash memory. If the circuit-ID configurations, combined with other data,
exceed the capacity of the NVRAM or the flash memory, an error message appears.
vlan vlan Specify the VLAN ID. The range is 1 to 4094.
override (Optional) Specify an override string, using from 3 to 63 ASCII
characters (no spaces).
string ASCII-string Specify a circuit ID, using from 3 to 63 ASCII characters (no
spaces).
Release Modification
12.2(53)SE2 This command was introduced.

Cisco Catalyst 3750-X Specifications

General

Brand	Cisco
Model	Catalyst 3750-X
Category	Switch
Language	English