Ip Dhcp Snooping Vlan Information Option Format-Type Circuit-Id String - Cisco catalyst 3750 Command Reference Manual

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ip dhcp snooping vlan information option format-type circuit-id string

ip dhcp snooping vlan information option format-type circuit-id

Use the ip dhcp snooping vlan information option format-type circuit-id string interface

configuration command to configure the option-82 circuit-ID suboption. Use the no form of this

command to configure the default circuit-ID suboption.

Syntax Description

string ASCII-string

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 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.

Catalyst 3750 Switch Command Reference

ip dhcp snooping vlan vlan information option format-type circuit-id string ASCII-string

no ip dhcp snooping vlan vlan information option format-type circuit-id string

Modification

This command was introduced.

Specify the VLAN ID. The range is 1 to 4094.

Specify a circuit ID, using from 3 to 63 ASCII characters (no

Catalyst 3750 Switch Cisco IOS Commands

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