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

Chapter 2 Catalyst 3750 Metro Switch Cisco IOS Commands
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
override
string ASCII-string
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 Release
12.2(25)SEE
12.2(52)SE
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 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 flash memory, an error message appears.
OL-9645-10
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
Modification
This command was introduced.
The override keyword was added.

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

Specify the VLAN ID. The range is 1 to 4094.
(Optional) Specify an override string, using from 3 to 63 ASCII
characters (no spaces).
Specify a circuit ID, using from 3 to 63 ASCII characters (no
spaces).
Catalyst 3750 Metro Switch Command Reference
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