mac

Commands for DHCP Snooping
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31.15 ip dhcp snooping binding user-control max-user
Command: ip dhcp snooping binding user-control max-user <number>
no ip dhcp snooping binding user-control max-user
Function: Set the max number of users allowed to access the port when enabling DHCP
Snooping binding user funciton; the no operation of this command will restore default
value.
Parameters: <number> the max number of users allowed to access the port, from 0 to
1024.
Command Mode: Port Configuration Mode.
Default Settings: The max number of users allowed by each port to access is 1024.
Usage Guide: This command defines the max number of trust users distributed
according to binding information, with ip dhcp snooping binding user-contrl enabled
on the port. By default, the number is 1024. Considering the limited hardware resources
of the switch, the actual number of trust users distributed depends on the resource
amount. If a bigger max number of users is set using this command, DHCP Snooping will
distribute the binding informaiton of untrust users to hardware to be trust users as long
as there is enough available resources. Otherwise, DHCP Snooping will change the
distributed binging informaiton accordint to the new smaller max user number. When the
number of distributed bingding informaiton entries reaches the max limit, no new DHCP
will be able to become trust user or to access other network resouces via the switch.
Examples: Enable DHCP Snooping binding user funtion on Port ethernet1/1, setting the
max number of user allowed to access by Port Ethernet1/1 as 5.
Switch(Config-If-Ethernet1/1)# ip dhcp snooping binding user-control max-user 5
Related Command: ip dhcp snooping binding user-control
31.16 ip dhcp snooping information enable
Command: ip dhcp snooping information enable
no ip dhcp snooping information enable
Function: This command will enable option 82 function of DHCP Snooping on the switch,
the no operation of this command will disable that function.
Parameters: None.
Default Settings: Option 82 function is disabled in DHCP Snooping by default.
Command Mode: Global Configuration Mode.
Usage Guide: Only by implementing this command, can DHCP Snooping add standard
option 82 to DHCP request messages and forward the message. The format of option1