Vlan Behavior; Deleting A Vlan - Lenovo Flex System Fabric CN4093 Application Manual

VLAN Behavior

Deleting a VLAN

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The switch updates the local VSIDB cache when any of the following takes place:
 When, at the configured refresh interval, the switch finds that the VSIDB
configuration has changed since the last poll.
 When a VM sends an ASSOCIATE message, but the VSI type does not exist in
the local VSIDB cache.
 When a VM sends an ASSOCIATE message, and the VSI type exists but the VSI
type's VLAN ID does not exist in the local VSIDB cache.
 When you update the VSIDB using the following command:
CN 4093# virt evb update vsidb <number>
 When the management port link status changes from down to up.
When a VM gets associated, the corresponding VLAN is dynamically created on
the switch port if the VLAN does not already exist.
VLANs that are dynamically created will be automatically removed from the
switch port when there are no VMs using that VLAN on the port.
Dynamic VLAN information will not be displayed in the running configuration.
However, the VLAN, port, and STP commands display the dynamic VLAN
information with a "*".
If you configure any Layer 2/Layer 3 features on dynamically created VLANs, the
VLAN information is displayed in the running configuration.
If you delete a VLAN that has a VM associated with it, you will see a warning
message similar to the following:
Warning: Vlan 10 is used by VM and can't be removed.
The VMs will not get disassociated.If a VM is associated with a port, and you
remove this port from a VLAN, you will see a warning message similar to the
following:
Warning: Port INTB1 in Vlan 10 is used by VM and can't be removed.
The VMs will not get disassociated.
Chapter 19: Edge Virtual Bridging
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