3Com 7757 Configuration Manual page 125

Configure the IP address of the VLAN 6 as 10.1.1.1, and the sub network mask
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as 255.255.255.0.
Enable the DHCP relay function on the VLAN interface of VLAN 6, and establish
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the mapping between VLAN 6 and the remote DHCP server group 2 to make
the hosts in VLAN 2 and VLAN 3 being able to dynamically obtain IP addresses
from the DHCP server group 2.
Configuration Procedure
# Create VLAN 6, and configure it as a super VLAN.
<SW7750> system-view
[SW7750] vlan 6
[SW7750-vlan6] supervlan
# Create VLAN 2 and VLAN 3 and establish the mapping between them and VLAN
6.
[SW7750-vlan6] quit
[SW7750] vlan 2
[SW7750-vlan2] quit
[SW7750] vlan 3
[SW7750-vlan3] quit
[SW7750] vlan 6
[SW7750-vlan6] subvlan 2 3
# Create the VLAN interface of VLAN 6, and configure an IP address for it.
[SW7750-vlan6] quit
[SW7750] interface Vlan-interface 6
[SW7750-Vlan-interface6] ip address 10.1.1.1 255.255.255.0
# Enable the DHCP relay function on the VLAN 6 interface, that is, establish the
mapping between the interface and the DHCP server group 2.
[SW7750-Vlan-interface6] dhcp-server 2
Super VLAN Configuration Example 125