Restarting the Protocol Migration Process
This procedure restarts the protocol migration process and forces renegotiation with neighboring switches. It
reverts the switch to MST mode. It is needed when the switch no longer receives IEEE 802.1D BPDUs after
it has been receiving them.
Beginning in privileged EXEC mode, follow these steps to restart the protocol migration process (force the
renegotiation with neighboring switches) on the switch.
Before You Begin
A multiple spanning tree (MST) must be specified and enabled on the switch. For instructions, see Related
Topics.
If you want to use the interface version of the command, you must also know the MST interface used. This
example uses GigabitEthernet1/0/1 as the interface because that was the interface set up by the instructions
listed under Related Topics.
SUMMARY STEPS
1.
Enter one of the following commands:
•
clear spanning-tree detected-protocols
•
clear spanning-tree detected-protocols interface interface-id
DETAILED STEPS
PurposeCommand or Action
The switch reverts to the MSTP mode, and
the protocol migration process restarts.
Enter one of the following commands:
Step 1
•
clear spanning-tree detected-protocols
•
clear spanning-tree detected-protocols interface interface-id
Example:
Switch# clear spanning-tree detected-protocols
or
Switch# clear spanning-tree detected-protocols interface
GigabitEthernet1/0/1
What to Do Next
This procedure may need to be repeated if the switch receives more legacy IEEE 802.1D configuration BPDUs
(BPDUs with the protocol version set to 0).
Related Topics
Specifying the MST Region Configuration and Enabling MSTP, on page 59
Catalyst 2960-XR Switch Layer 2 Configuration Guide, Cisco IOS Release 15.0(2)EX1
OL-29424-01 75
Configuring Multiple Spanning-Tree Protocol
Restarting the Protocol Migration Process
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