Cisco MWR 2941 - Clear Spanning-Tree Detected-Protocols

Cisco MWR 2941 Router Command Reference, Release 15.0(1)MR
clear spanning-tree detected-protocols
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Cisco MWR 2941 Router Command Reference, Release 15.0(1)MR
OL-23890-01
clear spanning-tree detected-protocols
To restart the protocol migration process, use the clear spanning-tree detected-protocols command in
privileged EXEC mode.
clear spanning-tree detected-protocol [interface [interface-type interface-number | port-channel
pc-number | vlan vlan-interface]
Syntax Description
Command Default None
Command Modes Privileged EXEC (#)
Command History
Usage Guidelines RSTP and MST have built-in compatibility mechanisms that allow them to interact properly with other
versions of IEEE spanning tree or other regions. For example, a bridge running RSTP can send 802.1D
BPDUs on one of its ports when it is connected to a legacy bridge. An MST bridge can detect that a port
is at the boundary of a region when it receives a legacy BPDU or an MST BPDU that is associated with
a different region. These mechanisms are not always able to revert to the most efficient mode. For
example, an RSTP bridge that is designated for a legacy 802.1D stays in 802.1D mode even after the
legacy bridge has been removed from the link. Similarly, an MST port assumes that it is a boundary port
when the bridges, to which it is connected, have joined the same region. To force the MST port to
renegotiate with the neighbors, enter the clear spanning-tree detected-protocol command.
If you enter the clear spanning-tree detected-protocols command with no arguments, the command is
applied to every port of the Catalyst 6500 series switch.
interface (Optional) Specifies the interface
interface-type The type of interface for which you want to clear the detected spanning tree
protocol.
interface-number The number of the interface for which you want to clear the detected spanning
tree protocol.
port-channel Clears the detected spanning tree protocol for a port-channel.
pc-number Specifies the port channel interface. Range: 1 to 282.
vlan Clears the detected spanning tree protocol for a VLAN.
vlan-interface Specifies the VLAN interface. Range: 1 to 4094.
Release Modification
12.2(14)SX Support for this command was introduced on the Supervisor Engine 720.
12.2(17d)SXB Support for this command on the Supervisor Engine 2 was extended to
Release 12.2(17d)SXB.
12.2(33)SRA This command was integrated into Cisco IOS Release 12.2(33)SRA.
15.0(1)MR This command was integrated into Cisco IOS Release 15.0(1)MR.