Spanning-Tree Mst Pre-Standard - Cisco ME 3800X Command Reference Manual

spanning-tree mst pre-standard

spanning-tree mst pre-standard
To configure a port to send only prestandard bridge protocol data units (BPDUs), use the spanning-tree
mst pre-standard command in interface configuration command. To return to the default setting, use
the no form of this command.
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 Release
12.2(52)EY
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.
If a switch port is connected to a switch running prestandard Cisco IOS software, you must use the
Note
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.
You can verify your settings by entering the show spanning-tree mst privileged EXEC command.
Examples
This example shows how to configure a port to send only prestandard BPDUs:
Switch(config-if)# spanning-tree mst pre-standard
Related Commands Command
show spanning-tree mst instance-id
Cisco ME 3800X and ME 3600X Switch Command Reference
-40
spanning-tree mst pre-standard
no spanning-tree mst pre-standard
Modification
This command was introduced.
Description
Displays multiple spanning-tree (MST) information,
including the prestandard flag, for the specified interface.
Chapter
OL-28238-01