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Cisco Catalyst Blade Switch 3030 Command Reference
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Chapter 2 Cisco
Catalyst
Blade Switch 3030 Cisco IOS Commands
spanning-tree mst pre-standard
spanning-tree mst pre-standard
Use the
spanning-tree mst pre-standard
interface configuration command to configure a port to send
only prestandard bridge protocol data units (BPDUs).
spanning-tree mst pre-standard
no spanning-tree mst pre-standard
Syntax Description
This command has no arguments or keywords.
Command Default
The default state is automatic detection of prestandard neighbors.
Command Modes
Interface configuration
Command History
Usage Guidelines
The port can accept both prestandard and standard BPDUs. If the neighbor types are mismatched, only
the common and internal spanning tree (CIST) runs on this interface.
Note
If a switch port is connected to a switch running prestandard Cisco IOS software, you
must
use the
spanning-tree mst pre-standard
interface configuration command on the port. If you do not configure
the port to send only prestandard BPDUs, the Multiple STP (MSTP) performance might diminish.
When the port is configured to automatically detect prestandard neighbors, the
prestandard
flag always
appears in the
show
spanning-tree mst
commands.
Examples
This example shows how to configure a port to send only prestandard BPDUs:
Switch(config-if)#
spanning-tree mst pre-standard
You can verify your settings by entering the
show spanning-tree mst
privileged EXEC command.
Related Commands
Release
Modification
12.2(25)SEE
This command was introduced.
Command
Description
show spanning-tree
mst
instance-id
Displays multiple spanning-tree (MST) information,
including the
prestandard
flag, for the specified interface.