Catalyst 3750-E and 3560-E Switch Cisco IOS ... - DNIP . NET

ip dhcp snooping vlan information option format-type circuit-id stringChapter 2Catalyst 3750-E and 3560-E Switch Cisco IOS Commandsip dhcp snooping vlan information option format-type circuit-idstringUse the ip dhcp snooping vlan information option format-type circuit-id string interfaceconfiguration command on the switch stack or on a standalone switch to configure the option-82circuit-ID suboption. Use the no form of this command to configure the default circuit-ID suboption.ip dhcp snooping vlan vlan information option format-type circuit-id [override] stringASCII-stringno ip dhcp snooping vlan vlan information option format-type circuit-id [override] stringSyntax Descriptionvlan vlan Specify the VLAN ID. The range is 1 to 4094.override(Optional) Specify an override string, using from 3 to 63 ASCIIcharacters (no spaces).string ASCII-stringSpecify a circuit ID, using from 3 to 63 ASCII characters (nospaces).DefaultsThe switch VLAN and the port identifier, in the format vlan-mod-port, is the default circuit ID.Command ModesInterface configurationCommand HistoryRelease12.2(35)SE212.2(52)SEModificationThis command was introduced.The override keyword was added.Usage GuidelinesYou must globally enable DHCP snooping by using the ip dhcp snooping global configurationcommand 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 portidentifier, in the format vlan-mod-port. This command allows you to configure a string of ASCIIcharacters to be the circuit ID. When you want to override the vlan-mod-port format type and insteaduse the circuit-ID to define subscriber information, use the override keyword.NoteWhen configuring a large number of circuit IDs on a switch, consider the impact of lengthy characterstrings 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.2-246Catalyst 3750-E and 3560-E Switch Command ReferenceOL-9776-08