Vlan Configuration Control - Nortel 325-24T Configuration Manual

52 Chapter 1 About Ethernet Switches 325 and 425

VLAN Configuration Control

VLAN Configuration Control (VCC) is a new feature in Software Release 3.6 that
allows a switch administrator to control how VLANs are modified. VLAN
Configuration Control is a superset of the existing AutoPVID functionality and
incorporates this functionality for backwards compatibility. VLAN Configuration
Control is globally applied to all VLANs on the switch.
VLAN Configuration Control offers four options for controlling VLAN
modification:
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Strict — This option restricts the addition of an untagged port to a VLAN if it
is already a member of another VLAN. To add an untagged port to a new
VLAN, the switch administrator must remove the port from all other VLANs
of which it is a member of before adding it to the new VLAN. The PVID of
the port will be changed to the new VID to which it was added.
Note: Strict is the factory default setting.
Automatic — This option automatically adds an untagged port to a new
VLAN and automatically removes it from any previous VLAN membership.
The PVID of the port is automatically changed to the VID of the VLAN it
joins. Since the port is first added to the new VLAN and then removed from
any previous membership, the Spanning Tree Group participation of the port
will not be disabled as long as the VLANs involved are in the same Spanning
Tree Group.
AutoPVID — This option functions in the same manner as previous
AutoPVID functionality. When an untagged port is added to a new VLAN,
the port is added to the new VLAN and the PVID assigned to the new VID
without removing it from any previous VLAN memberships. Using this
option an untagged port can have membership in multiple VLANs.
Flexible — This option functions in a similar manner to disabling AutoPVID
functionality. When this option is used, there are no restrictions on the
number of VLANs to which an untagged port can belong. Any new additions
of an untagged port to a new VLAN does not change the PVID of that port.