3Com Switch 4800G 24-Port Configuration Manual page 181

Network diagram
Figure 48 Network diagram for configuring dynamic binding
GE 1/0/1
Client A
Configuration procedure
1 Configure Switch A
# Configure dynamic binding on port GigabitEthernet1/0/1.
<SwitchA> system-view
[SwitchA] interface GigabitEthernet 1/0/1
[SwitchA-GigabitEthernet1/0/1] ip check source ip-address mac-address
[SwitchA-GigabitEthernet1/0/1] quit
# Enable DHCP snooping on Switch A.
[SwitchA] dhcp-snooping
# Configure port GigabitEthernet1/0/2 connected to the DHCP server as a trusted
port.
[SwitchA] interface GigabitEthernet1/0/2
[SwitchA-GigabitEthernet1/0/2] dhcp-snooping trust
[SwitchA-GigabitEthernet1/0/2] quit
2 Verify the configuration
# Display the dynamic binding entries that port GigabitEthernet1/0/1 has obtained
from DHCP Snooping.
<SwitchA> display ip check source
The following user address bindings have been configured:
MAC IP
0001-0203-0406 192.168.0.1
-----------------1 binding entries queried, 1 listed------------------
# Display the dynamic entries of DHCP Snooping and check it is identical with the
dynamic entries that port GigabitEthernet1/0/1 has obtained.
<SwitchA> display dhcp-snooping
DHCP Snooping is enabled.
The client binding table for all untrusted ports.
Type : D--Dynamic , S--Static
Type IP Address
==== =============== ============== ============ ==== =================
D 192.168.0.1
As you see, port GigabitEthernet1/0/1 has obtained the dynamic entries generated
by DHCP Snooping after it is configured with dynamic binding function.
IP Source Guard Configuration Examples
GE 1/0 /2
Switch A DHCP server
Vlan Port
1 GigabitEthernet1/0/1
MAC Address Lease
0001-0203-0406 86335
Status
DHCP-SNP
VLAN Interface
1 GigabitEthernet1/0/1
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