Displaying Super Vlan - 3Com 7757 Configuration Manual

Configuring Super VLAN
to Support DHCP Relay
Displaying Super
VLAN
After establishing the mapping between the sub VLAN and the super VLAN,
■
you can still add (or delete) ports to (from) the sub VLAN.
With DHCP relay function enabled on the VLAN interface of the super VLAN, the
hosts of all sub VLANs that map with the super VLAN can dynamically obtain IP
addresses from the outside networks.
With the DHCP relay function enabled on the VLAN interface of the super VLAN,
the host of the sub VLAN that maps the interface and the DHCP host in another
network segment can forward the DHCP packets to each other, so as to assist the
hosts in the sub VLANs to finish the dynamic configuration of IP address.
Configuration Prerequisites
Configure a super VLAN and a sub VLAN, and establish the mapping between
■
them.
Configure the IP address of the super VLAN to make the hosts in the sub VLAN
■
being able to communicate with the outside network.
Configuration Procedure
Operation
Enter system view
Enter VLAN interface view of
the super VLAN
Configure the mapping
between the interface and the
DHCP server group
n
A super VLAN interface can only correspond to one DHCP server group.
■
The last configuration will take effect if you execute the dhcp-server groupNo
■
command.
The group number specified in the dhcp-server groupNo command needs to
■
be configured first in the dhcp-server ip command. Refer to "Configuring an
Interface to Operate in DHCP Relay Agent Mode" on page 614.
After the above configurations, you can use the display command in any view the
super VLAN configuration and verify the configuration effect.
Table 72 Display super VLAN configuration
Operation
Display the mapping between
the super VLAN and the sub
VLAN
Command
system-view
interface Vlan-interface
vlan-id
dhcp-server groupNo
Command
display supervlan
[ supervlan-id ]

Displaying Super VLAN

123
Description
-
-
Required
By default, the VLAN interface
does not establish homing
relationship with any DHCP
server group.
Description
The display command can be
executed in any view.