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3.21.13 spanning-tree bpdu
The spanning-tree bpdu global configuration command defines BPDU handling when spanning-tree is disabled on an
interface.
Syntax
spanning-tree bpdu {filtering | flooding}
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filtering — Filter BPDU packets when spanning-tree is disabled on an interface.
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flooding — Flood BPDU packets when spanning-tree is disabled on an interface.
Default Configuration
The default definition is flooding.
Command Modes
Global Configuration mode
User Guidelines
The command is relevant when spanning-tree is disabled globally or on a single interface..
Example
The following example defines BPDU packet flooding when spanning-tree is disabled on an interface
Console(config)# spanning-tree bpdu flooding
3.21.14 clear spanning-tree detected-protocols
The clear spanning-tree detected-protocols privileged EXEC command restarts the protocol migration process (force
the renegotiation with neighboring switches) on all interfaces or on the specified interface.
Syntax
clear spanning-tree detected-protocols [ethernet interface number | port-channel port-channel-number]
interface — A valid Ethernet port.
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port-channel-number — A port-channel index.
Default Configuration
If no interface is specified, the action is applied to all interfaces.
Command Modes
Privileged EXEC mode
User Guidelines
This feature should be used only when working in RSTP mode.
Example
The following example restarts the protocol migration process (forces the renegotiation with neighboring switches) on g1.
Console# clear spanning-tree detected-protocols ethernet g1
3.21.15 show spanning-tree
The show spanning-tree privileged EXEC command displays spanning-tree configuration.
20.15.1 Syntax
show spanning-tree [ ethernet interface | port-channel port-channel-number ]
show spanning-tree [detail] [active | blockedports]
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interface — The full syntax is: unit/port. (Range: Valid Ethernet port)
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port-channel-number — Port channel index. (Range:Valid port channel
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