Cisco Nexus 9000 Series - Page 368

DETAILED STEPS
PurposeCommand or Action
Enters global configuration mode.configure terminal
Example:
Step 1
switch# configure terminal
switch(config)#
Enables the insertion and removal of Option 82 information
for DHCP packets. The no form of this command disables
the insertion and removal of Option 82 information.
[no] ip dhcp snooping information option
Example:
switch(config)# ip dhcp snooping information option
Step 2
Configures Option 82 as follows:(Optional) [no] ip dhcp option82 sub-option circuit-id
format_type string format
Step 3
• If you do not specify format-type, the circuit-id
displays the incoming port, for example, ethernet1/1.
Example:
switch(config)# ip dhcp snooping sub-option
circuit-id format-type string format
• If you specify format <word>, the circuit-id displays
the specified word
Example:
• If you specify %h instead of <word>, the circuit-id
displays the host name.
switch(config)# ip dhcp snooping sub-option
circuit-id format-type string format?
WORD Format string (Max Size 64)
• If you specify %p instead of <word>, the circuit-id
displays the port name.
• If you specify %h:%p instead of <word>, the
circuit-id displays both host and port name.
The no option disables this behavior.
Note
Enters the interface configuration mode, where slot/port is
the interface where you want to enable or disable snooping.
interface interface slot/port
Example:
Step 4
switch(config)# interface ethernet 2/2
switch(config-if)#
Configures Option 82 at the interface.(Optional) ip dhcp option82 sub-option circuit-id
Step 5
Example:
The no option disables this behavior
Note
switch(config-if)# ip dhcp option82 sub-option
circuit-id?
WORD Format string (Max Size 64)
Example:
switch(config-if)# ip dhcp option82 sub-option
circuit-id test
switch(config-if)#
Exits interface configuration mode.exit
Example:
Step 6
switch(config-if)# exit
switch(config)#
Cisco Nexus 9000 Series NX-OS Security Configuration Guide, Release 9.x
342
Configuring DHCP
Enabling or Disabling Option 82 Data Insertion and Removal