User Manual

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NETGEAR M4500 Series Switches CLI Command Reference Manual 497
5.17.21. ip dhcp snooping information option vlan
This command enables or disables the DHCP Snooping option 82 in a range of VLANs.
Format [no] ip dhcp snooping information option vlan <vlan-list>
Default Disable
Mode Global Config
5.17.22. ip dhcp snooping information option trust
This command configures an interface to be trusted for Option-82 reception.
Format [no] ip dhcp snooping information option trust
Default Disable
Mode Interface Config
5.17.23. ip dhcp snooping limit
This command controls the rate at which the DHCP Snooping messages come. If packet rate exceeds limitation
over burst interval, the assigned port will shut down automatically. User could use interface command
shutdown and then no shutdown to recover it. Use keyword no to restore the default value of this
command.
The parameter rate means to the limitation of packet rate. Its range is from 0 to 300 packets per second.
The parameter “burst interval” means the time interval of packet burst could be over rate limitation. Its range is
from 1 to 15 seconds.
Format ip dhcp snooping limit {rate <pps> [burst interval <seconds>] | none}
no ip dhcp snooping limit
Default rate is None
“burst interval” is 1 second.
Mode Interface Config
Example: While the packet rate of DHCP message received from port 0/1 exceeds 100 pps and consecutive time
interval is over 10 seconds, the port 0/1 will be shutdown automatically.
(M4500-32C) #configure
(M4500-32C) (Config)#interface 0/1