Quick Reference Guide

Spanning-Tree Commands 363
Syntax
• spanning-tree bpdu { filtering | flooding }
• no spanning-tree bpdu
• filtering — Filter BPDU packets when spanning-tree is disabled on an interface.
• 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.
clear spanning-tree detected-protocols
The clear spanning-tree detected-protocols Privileged EXEC mode 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.
• 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.
Console(config)# spanning-tree bpdu flooding
5400_CLI.book Page 363 Wednesday, December 17, 2008 4:33 PM