mac

Commands for DHCP Snooping
367
circute-id suboption by themselves.
Parameters: WORD the defined character string of circuit-id by themselves, the
maximum length is 64.
Command Mode: Global Mode
Default: Using standard method.
Usage Guide: After configure this command, if users do not configure circuit-id on port, it
will create circuit-id suboption for option82 according to self-defined method.
Self-defined format of circuit-id: if self-defined subscriber-id format is ascii, the filled
format of vlan such as “Vlan2”, the format of port such as “Ethernet1/1”, the format of
mac and remote-mac such as “00-02-d1-2e-3a-0d”. If self-defined format is hex, the filled
format of vlan occupies 2 bytes, port occupies 4 bytes, a byte means slot (for chassis
switch, it means slot ID, for box switch, it is 1), a byte means Module (the default is 0),
two bytes means port ID beginning from 1, mac and remote-mac occupy 6 bytes. Each
option will be filled to packets according to the configured order of the commands and
divide them with delimiter (delimiter is ip dhcp snooping information option delimiter
configuration).
Example: Set self-defined method of circuit-id suboption as vlan, port, mac and
remote-mac for option82.
Switch(config)#ip dhcp snooping information option self-defined subscriber-id vlan port id
remote-mac
31.23 ip dhcp snooping information option
self-defined subscriber-id format
Command: ip dhcp snooping information option self-defined subscriber-id format
[ascii | hex]
Function: Set self-defined format of circuit-id for snooping option82.
Parameters: None.
Command Mode: Global Mode
Default: ascii.
Usage Guide: self-defined format uses ip dhcp snooping information option type
self-defined subscriber-id to create circuit-id format.
Example: Set self-defined format of circuit-id as hex for snooping option82.
Switch(config)#ip dhcp snooping information option self-defined subscriber-id format hex