Cisco Catalyst 2960-X Command Reference

clear spanning-tree detected-protocols
To restart the protocol migration process and force renegotiation with neighboring switches on the interface,
use the clear spanning-tree detected-protocols command in privileged EXEC mode.
clear spanning-tree detected-protocols [interface interface-id]
Syntax Description
(Optional) Restarts 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 24.
interface interface-id
Command Default
None
Command Modes
Privileged EXEC
Command History
ModificationRelease
This command was introduced.Cisco IOS 15.0(2)EX
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 method that enables it to interoperate with legacy
IEEE 802.1D switches. If a rapid-PVST+ or an MSTP switch receives a legacy IEEE 802.1D configuration
bridge protocol data unit (BPDU) with the protocol version set to 0, the switch 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).
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 gigabitethernet2/0/1
Catalyst 2960-X Switch Layer 2 Command Reference, Cisco IOS Release 15.0(2)EX
28 OL-29043 -01
Layer 2 Commands
clear spanning-tree detected-protocols

Cisco Catalyst 2960-X Specifications

General

Console port	RJ-45
USB 2.0 ports quantity	2
SFP module slots quantity	4
Installed SFP modules quantity	-
Gigabit Ethernet (copper) ports quantity	48
Basic switching RJ-45 Ethernet ports type	Gigabit Ethernet (10/100/1000)
Power source	AC
Input current	5 A
AC input voltage	100 - 240 V
Power consumption (typical)	60.9 W
Number of power supply units	1
Redundant power supply (RPS) support	Yes
Operating altitude	0 - 3000 m
Non-operating altitude	0 - 4000 m
Storage temperature (T-T)	-25 - 70 °C
Operating temperature (T-T)	-5 - 40 °C
Operating relative humidity (H-H)	10 - 95 %
Switching protocols	UDP, TCP, RADIUS/TACACS+
Number of VLANs	1023
Networking standards	IEEE 802.1ab, IEEE 802.1D, IEEE 802.1p, IEEE 802.1Q, IEEE 802.1s, IEEE 802.1w, IEEE 802.1x, IEEE 802.3, IEEE 802.3ab, IEEE 802.3ad, IEEE 802.3ae, IEEE 802.3af, IEEE 802.3ah, IEEE 802.3at, IEEE 802.3az, IEEE 802.3u, IEEE 802.3x, IEEE 802.3z
Throughput	107.1 Mpps
Jumbo frames	9216
Number of queues	8
MAC address table	16000 entries
Number of static routes	1000
DHCP features	DHCP server
Authentication	MAC-based authentication, Port-based authentication
Security algorithms	802.1x RADIUS, SNMP, SSH
Access Control List (ACL) rules	3
Switch type	Managed
Switch layer	L2/L3
Safety	UL 60950-1, CAN/CSA-C22.2 No. 60950-1, EN 60950-1, IEC 60950-1, AS/NZS 60950-1
Form factor	1U
Product color	Black
Total Power over Ethernet (PoE) budget	370 W
Power over Ethernet (PoE) ports quantity	24
Power over Ethernet plus (PoE+) ports quantity	12
Memory type	DRAM
Noise level	39 dB
Flash memory	128 MB
Internal memory	512 MB
Processor frequency	600 MHz
Mean time between failures (MTBF)	276870 h

Weight and Dimensions

Depth	368 mm
Width	445 mm
Height	45 mm
Weight	5800 g