Alcatel-Lucent 060321-10, Rev. B, Cli Reference Manual

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spantree auto-vlan-containment Distributed Spanning Tree Commands
page 5-32 OmniSwitch CLI Reference Guide March 2011
spantree auto-vlan-containment
Enables or disables Auto VLAN Containment (AVC). When enabled, AVC prevents a port that has no
VLANs mapped to an Multiple Spanning Tree Instance (MSTI) from becoming the root port for that
instance. Such ports are automatically assigned an infinite path cost value to make them an inferior choice
for root port.
spantree [msti msti_id] auto-vlan-containment {enable | disable}
Syntax Definitions
msti_id An existing MSTI ID number. A range of VLANs are
associated to an MSTI ID number.
enable Enables automatic VLAN containment.
disable Disables automatic VLAN containment.
Defaults
By default, automatic VLAN containment is disabled.
Platforms Supported
OmniSwitch 10K
Usage Guidelines
•
The AVC feature is not active for any MSTI until it is globally enabled. To globally enable this feature,
use the
spantree auto-vlan-containment command but do not specify an msti_ id .
•
When AVC is globally enabled, it is active for all MSTIs. To disable AVC for a single instance,
specify the
msti_id for the instance and use the disable form of this command.
•
Use the enable form of this command and specify an msti_id to enable AVC for an instance that was
previously disabled.
•
An administratively set port path cost takes precedence and prevents AVC configuration of the path
cost. However, if the port path cost is administratively set to zero, then the path cost is reset to the
default value.
•
Note that when AVC is disabled, a port assigned to a VLAN that is not mapped to a specific instance,
can become the root port for that instance and cause a loss of connectivity between other VLANs.
•
AVC does not have any effect on root bridges.
Examples
-> spantree auto-vlan-containment enable
-> spantree auto-vlan-containment disable
-> spantree msti 1 auto-vlan-containment disable
-> spantree msti 1 auto-vlan-containment enable