Specifications

2-253
Catalyst 4500 Se ries S wit ch C is co IO S C om mand R efer ence —Re lease I OS XE 3 .3.0 XO(1 5.1 (1)XO)
OL_28738 -01
Chapter 2 Cisco IOS Commands for the Catalyst 4500 Series Switches
ip dhcp snooping vlan information option format-type circuit-id string
ip dhcp snooping vlan info rmation option format-t ype circuit-id
string
To enable circuit-id ( a sub option of DHCP sn ooping option 82) on a VLA N, use the ip dhcp snooping
vlan information option form at-type circu it-id stri ng command. To disable circuit-id on a VLAN, use
the no form of this command.
ip dhcp snooping vlan number information option format-type circuit-id [override] string
string
no ip dhcp snoo ping vlan numbe r inform ation option format-t ype circuit-id [over rid e] string
Syntax Description
Defaults VLAN-mod-por t, if D HCP sn ooping o ption-82 is d isabled.
Command Modes Interface configuration
Usage Guidelines The circuit-id subopt ion of DHCP o ption 82 i s supported o nly when DHCP snooping is globa lly enabled
and on VLANs usi ng 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 for mat type and instead use the c ircuit-ID to define subsc riber
information, use the override keyword.
Examples The followin g examp le shows how to ena ble DHCP snooping on VLAN 5 00 throu gh 555 a nd 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
Switch(config-if)# ip dhcp snooping vlan 555 information option format-type circuit-id
string customer-555
Switch(config-if)# interface FastEthernet 2/1
Switch(config-if)# ip dhcp snooping vlan 555 information option format-type circuit-id
string customer-500
Switch(config)# end
This example shows how to configure the opti on-82 circuit-ID overr ide suboption:
number S pecifies single or range of VLANs; valid values are from 1 to 4094.
override (Optional) Specifies an override string.
string string Specifies a user-defined string for the circuit ID; range of 3 to 63 ASCII characters
with no spaces.