Ip Dhcp Snooping Vlan Information Option Format-Type Circuit-Id String - Cisco Catalyst 4500 Series Command Reference Manual

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

ip dhcp snooping vlan information option format-type circuit-id
string
To enable circuit-id (a suboption of DHCP snooping option 82) on a VLAN, use the ip dhcp snooping
vlan information option format-type circuit-id string command. To disable circuit-id on a VLAN, use
the no form of this command.
Syntax Description number
override
string string
Defaults
VLAN-mod-port, if DHCP snooping option-82 is disabled.
Command Modes Interface configuration
Command History Release
12.2(40)SG
12.2(54)SG
Usage Guidelines The circuit-id suboption of DHCP option 82 is supported only when DHCP snooping is globally enabled
and on VLANs using DHCP option 82.
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.
Examples
The following example shows how to enable DHCP snooping on VLAN 500 through 555 and option 82
circuit-id:
Switch# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Switch(config)# ip dhcp snooping
Switch(config)# ip dhcp snooping vlan 500 555
Switch(config)# ip dhcp snooping information option format remote-id string switch123
Switch(config)# interface GigabitEthernet 5/1
Switch(config-if)# ip dhcp snooping trust
Switch(config-if)# ip dhcp snooping limit rate 100
Catalyst 4500 Series Switch Cisco IOS Command Reference—Release IOS XE 3.4.0SG and IOS 15.1(2)SG)
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ip dhcp snooping vlan number information option format-type circuit-id [override] string
string
no ip dhcp snooping vlan number information option format-type circuit-id [override] string
Specifies single or range of VLANs; valid values are from 1 to 4094.
(Optional) Specifies an override string.
Specifies a user-defined string for the circuit ID; range of 3 to 63 ASCII characters
with no spaces.
Modification
Support for this command was introduced on the Catalyst 4500 series switch.
Added the override option
Chapter 2 Cisco IOS Commands for the Catalyst 4500 Series Switches
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