3com 8807 Reference Guide

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You can still add/remove ports to/from a VLAN after the mapping relationship is 
established.

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The undo subvlan command cancels all mapping relationships between the 
specified super VLAN and all sub VLANs. If you do not specify the sub-vlan-list 
argument. Otherwise, this command cancels the mapping relationship 
between the specified sub VLAN and the specified super VLAN.

Related command: display supervlan.

# Establish mapping relationship between super VLAN 10 and sub VLANs with 
VLAN IDs of 3, 4, 5 and 9.

[3Com-vlan10] subvlan 3 to 5 9 

VLAN view

None

Use the supervlan command to set a VLAN to be a super VLAN.

Use the undo supervlan command to cancel the super VLAN type of a VLAN.

By default, no type is configured for a VLAN.

Note that:

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You cannot add ports to a super VLAN.

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The ARP proxy of the interfaces of a VLAN are enabled automatically and 
cannot be disabled when the VLAN is set to be a super VLAN.

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The default VLANs cannot be super VLANs.

Related command: display supervlan.

# Set VLAN 2 to be a super VLAN.

[3Com-vlan2] supervlan