HP Cisco Catalyst Blade Switch 3020 Cisco Catalyst Blade Switch 3020 for HP Co - Page 74
clear spanning-tree detected-protocols
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clear spanning-tree detected-protocols Chapter 2 Cisco Catalyst Blade Switch 3020 for HP Cisco IOS Commands clear spanning-tree detected-protocols Use the clear spanning-tree detected-protocols privileged EXEC command to restart the protocol migration process (force the renegotiation with neighboring switches) on all interfaces or on the specified interface. clear spanning-tree detected-protocols [interface interface-id] Syntax Description interface interface-id (Optional) Restart the protocol migration process on the specified interface. Valid interfaces include physical ports, VLANs, and port channels. The VLAN range is 1 to 4094. The port-channel range is 1 to 48. Defaults No default is defined. Command Modes Privileged EXEC Command History Release 12.2(25)SEF Modification This command was introduced. Usage Guidelines A switch running the rapid per-VLAN spanning-tree plus (rapid-PVST+) protocol or the Multiple Spanning Tree Protocol (MSTP) supports a built-in protocol migration mechanism that enables it to interoperate with legacy IEEE 802.1D switches. If a rapid-PVST+ switch or an MSTP switch receives a legacy IEEE 802.1D configuration bridge protocol data unit (BPDU) with the protocol version set to 0, it sends only IEEE 802.1D BPDUs on that port. A multiple spanning-tree (MST) switch can also detect that a port is at the boundary of a region when it receives a legacy BPDU, an MST BPDU (Version 3) associated with a different region, or a rapid spanning-tree (RST) BPDU (Version 2). However, the switch does not automatically revert to the rapid-PVST+ or the MSTP mode if it no longer receives IEEE 802.1D BPDUs because it cannot learn whether the legacy switch has been removed from the link unless the legacy switch is the designated switch. Use the clear spanning-tree detected-protocols command in this situation. Examples This example shows how to restart the protocol migration process on a port: Switch# clear spanning-tree detected-protocols interface gigabitethernet0/1 Related Commands Command show spanning-tree spanning-tree link-type Description Displays spanning-tree state information. Overrides the default link-type setting and enables rapid spanning-tree changes to the forwarding state. 2-46 Cisco Catalyst Blade Switch 3020 for HP Command Reference OL-8916-01