3Com S7906E Configuration Manual page 1979

Dynamic Binding Function Configuration Example 2
Network requirements
The S7900E switch acting as an OLT device is connected to the DHCP server through
GigabitEthernet 2/0/1 and connected to an ONU through OLT 3/0/1. UNI 1 of the ONU is connected
to a user device.
Enable DHCP snooping on the switch.
Bind port ONU 3/0/1:1 to the ONU, whose MAC address is 000f-e200-0001.
The user device, with the MAC address 00-01-02-03-04-06, obtains an IP address through the
DHCP server. The DHCP snooping entry for the user device is generated on the OLT device.
Enable IP Source Guard on OLT 3/0/1 to protect the server against attacks launched by clients
using fake source IP addresses.
This example shows only the OLT configuration. For DHCP server configuration, refer to the DHCP
Configuration in the IP Service Volume.
Network diagram
Figure 1-3 Network diagram for configuring dynamic binding function II
Configuration procedure
1) Configure the OLT device.
# Enable DHCP snooping.
<Sysname> system-view
[Sysname] dhcp-snooping
# Configure GigabitEthernet 2/0/1, which is connected to the DHCP server, as a trust port.
[Sysname] interface gigabitethernet2/0/1
[Sysname-GigabitEthernet2/0/1] dhcp-snooping trust
[Sysname-GigabitEthernet2/0/1] quit
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