Ip Dhcp Snooping Vlan Information Option Format-Type Circuit-Id String - Cisco Catalyst 3030 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
string
Use the ip dhcp snooping vlan information option format-type circuit-id string interface
configuration command on the switch to configure the option-82 circuit-ID suboption. Use the no form
of this command to configure the default circuit-ID suboption.
Syntax Description
vlan vlan
stringASCII-string
Defaults
The switch VLAN and the port identifier, in the format vlan-mod-port, is the default circuit ID.
Command Modes
Interface configuration
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
Note
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.
Examples
This example shows how to configure the option-82 circuit-ID suboption:
Switch(config-if)# ip dhcp snooping vlan 250 information option format-type circuit-id
string customerABC-250-0-0
You can verify your settings by entering the show ip dhcp snooping user EXEC command.
The show ip dhcp snooping user EXEC command only displays the global command output, including
Note
a remote-ID configuration. It does not display any per-interface, per-VLAN string that you have
configured for the circuit ID.
Cisco Catalyst Blade Switch 3030 Command Reference
2-116
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
Chapter 2
Cisco Catalyst Blade Switch 3030 Cisco IOS Commands
Specify the VLAN ID. The range is 1 to 4094.
Specify a circuit ID, using from 3 to 63 ASCII characters (no
spaces).
78-17262-01
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