3Com 7750 Series Command Reference Manual page 158

3Com Switch 7750 Series
Command Reference Guide — Q-in-Q Commands
Use the undo shared-vlan slot command to remove the configuration.
By default, no shared-VLAN is configured on the LPU.
Note:
You must use a created VLAN as shared-VLAN; otherwise the system gives an error
prompt.
Caution:
Shared-VLAN can damage and disable RRPP. Therefore, do not enable both RRPP
and shared-VLAN on the switch.
Example
# Configure VLAN 20 on the LPU in slot 3 as shared-VLAN.
<3Com> system-view
System View: return to User View with Ctrl+Z.
[3Com] shared-vlan 20 slot 3
Chapter 3 Shared-VLAN Configuration Commands
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