3Com Switch 7700 Configuration Manual page 75

Figure 3 Networking Diagram of Configuring DHCP Relay
VLAN 2
VLAN 3
1 Configure the DHCP Server IP addresses into DHCP Server Group 1.
[SW7700] dhcp-server 1 ip 1.99.255.36 1.99.255.35
2 Associate DHCP Server Group 1 with VLAN interface 2.
[SW7700-VLAN-Interface2] dhcp-server 1
3 Configure the IP address corresponding to DHCP server group 2.
[SW7700] dhcp-server 2 ip 1.88.255.36 1.88.255.35
4 Associate the DHCP Server Group 2 with VLAN interface 3.
[SW7700-VLAN-Interface3] dhcp-server 2
5 Configure the corresponding interface and gateway address of VLAN2.
[SW7700] vlan 2
[SW7700-vlan2] port Ethernet 1/0/2
[SW7700] interface vlan 2
[SW7700-VLAN-Interface2] ip address 1.1.2.1 255.255.0.0
6 Configure the corresponding interface and gateway address of VLAN3.
[SW7700] vlan 3
[SW7700-vlan3] port Ethernet 1/0/3
[SW7700] interface vlan 3
[SW7700-VLAN-Interface3] ip address 21.2.2.1 255.255.0.0
7 It is necessary to configure a VLAN for the servers. The corresponding interface
VLAN of the DHCP server group 1 is configured as 4000, and that of the group 2
is configured as 3001.
[SW7700] vlan 4000
[SW7700-vlan4000] port Ethernet 1/0/4
[SW7700] interface vlan 4000
[SW7700-VLAN-Interface4000] ip address 1.99.255.1 255.255.0.0
[SW7700] vlan 3001
[SW7700-vlan3001] port Ethernet 1/0/5
[SW7700] interface vlan 3001
[SW7700-VLAN-Interface3001] ip address 1.88.255.1 255.255.0.0
In this example, clients on VLAN2 will receive IP addresses from the servers in
DHCP server group 1 (VLAN 4000). Clients on VLAN3 will receive IP addresses
from the servers in DHCP server group 2 (VLAN 3001).
Server Group 1
VLAN
4000
IP Network
VLAN
3001
Server Group 2
DHCP Relay 67
1.99.255.36
1.99.255.35
1.88.255.36
1.88.255.35