Dell PowerConnect M6220, User Configuration Manual

Page: 816 / 1294

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Snooping and Inspecting Traffic
To configure the switch:
1
Enable DHCP snooping on VLAN 100.
console# config
console(config)# ip dhcp snooping vlan 100
2
Configure LAG 1, which includes ports 21-24, as a trusted port. All other
interfaces are untrusted by default.
console(config)#
interface port-channel 1
console(config-if-Po1)#
ip dhcp snooping trust
console(config-if-Po1)#
exit
3
Enter interface configuration mode for all untrusted interfaces (ports 1-
20) and limit the number of DHCP packets that an interface can receive
to 100 packets per second. LAG 1 is a trusted port and keeps the default
value for rate limiting (unlimited).
console(config)# interface range gi1/0/1-20
console(config-if)# ip dhcp snooping limit rate 100
console(config-if)# exit
4
Specify that the DHCP snooping database is to be stored remotely in a file
called dsDb.txt on a TFTP server with and IP address of 10.131.11.1.
console(config)# ip dhcp snooping database
tftp://10.131.11.1/dsDb.txt
console(config)#exit
5
Enable DHCP snooping for the switch
console(config)#
ip dhcp snooping
6
View DHCP snooping information.
console# show ip dhcp snooping
DHCP snooping is Enabled
DHCP snooping source MAC verification is enabled
DHCP snooping is enabled on the following VLANs:
100
Interface Trusted Log Invalid Pkts
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