Cisco Catalyst 2960 Series, Configuration Manual

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Designating the Neighbor Type
A topology could contain both prestandard and IEEE 802.1s standard compliant devices. By default, ports
can automatically detect prestandard devices, but they can still receive both standard and prestandard BPDUs.
When there is a mismatch between a device and its neighbor, only the CIST runs on the interface.
You can choose to set a port to send only prestandard BPDUs. The prestandard flag appears in all the show
commands, even if the port is in STP compatibility mode.
This procedure is optional.
Before You Begin
A multiple spanning tree (MST) must be specified and enabled on the switch. For instructions, see Related
Topics.
SUMMARY STEPS
1. enable
2. configure terminal
3.
interface interface-id
4. spanning-tree mst pre-standard
5.
end
DETAILED STEPS
Purpose Command or Action
Enables privileged EXEC mode. Enter your password if
prompted. enable
Example:
Switch> enable
Step 1
Enters the global configuration mode.
configure terminal
Example:
Switch# configure terminal
Step 2
Specifies an interface to configure, and enters interface
configuration mode. Valid interfaces include physical ports. interface interface-id
Example:
Switch(config)# interface GigabitEthernet1/0/1
Step 3
Specifies that the port can send only prestandard BPDUs.
spanning-tree mst pre-standard
Example:
Switch(config-if)# spanning-tree mst
pre-standard
Step 4
Consolidated Platform Configuration Guide, Cisco IOS Release 15.2(4)E (Catalyst 2960-X Switches)
277
How to Configure MSTP Features