Spanning-Tree Mst Pre-Standard - Cisco Catalyst 2960-X Command Reference Manual

spanning-tree mst pre-standard

spanning-tree mst pre-standard
To configure a port to transmit only prestandard bridge protocol data units (BPDUs), use the spanning-tree
mst pre-standard command in interface configuration mode. To return to the default settings, use the no
form of this command.
spanning-tree mst pre-standard
no spanning-tree mst pre-standard
Syntax Description
This command has no arguments or keywords.
Command Default
The default is to automatically detect prestandard neighbors.
Command Modes
Interface configuration
Command History
Release
Cisco IOS 15.0(2)EX
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 transmit only prestandard BPDUs:
Switch(config-if)# spanning-tree mst pre-standard
Related Commands
Command
spanning-tree bpdufilter
spanning-tree bpduguard
spanning-tree portfast (interface configuration)
Catalyst 2960-X Switch Layer 2 Command Reference, Cisco IOS Release 15.0(2)EX
100
Modification
This command was introduced.
Description
Enables BPDU filtering on the interface.
Enables BPDU guard on the interface.
Enables PortFast on the interface.
Layer 2 Commands
OL-29043 -01