3com WX3000 Manuel D’Utilisation

 

3-10 

Enable IP filtering 

ip check source ip-address 
[ mac-address ] 

Required 

By default, this function is 
disabled. 

Create an IP static binding 
entry 

ip source static binding 
ip-address ip-address 
[ mac-address mac-address ] 

Optional 

By default, no static binding 
entry is created. 

 

z 

Enable DHCP snooping and specify trusted ports on the device before configuring IP filtering. 

z 

You are not recommended to configure IP filtering on the ports of an aggregation group. 

 

As shown in 

, GigabitEthernet 1/0/5 of Switch is connected to the DHCP server, and 

GigabitEthernet 1/0/1, GigabitEthernet 1/0/2, and GigabitEthernet 1/0/3 are respectively connected to 

Client A, Client B, and Client C.  

z 

Enable DHCP snooping on Switch. 

z 

Specify GigabitEthernet 1/0/5 on Switch as a trusted port for DHCP snooping. 

z 

Enable DHCP-snooping Option 82 support on Switch and set the remote ID field in Option 82 to the 

system name of Switch. Set the circuit ID sub-option to “abcd” in DHCP packets from VLAN 1 on 

GigabitEthernet 1/0/3. 

Figure 3-6 Network diagram for DHCP-snooping Option 82 support configuration 

GE1/0/2

Client  B

Switch

Client  A

GE1/0/1

Client  C

GE1/0/3

GE1/0/5