Cisco Catalyst 2960-X Command Reference

spanning-tree mst pre-standard
To configure a port to transmit only prestandard bridge protocol data units (BPDUs), use the spanning-tree
mst pre-standard command in interface configuration mode. To return to the default settings, use the no
form of this command.
spanning-tree mst pre-standard
no spanning-tree mst pre-standard
Syntax Description
This command has no arguments or keywords.
Command Default
The default is to automatically detect prestandard neighbors.
Command Modes
Interface configuration
Command History
ModificationRelease
This command was introduced.Cisco IOS 15.0(2)EX
Usage Guidelines
The port can accept both prestandard and standard BPDUs. If the neighbor types are mismatched, only the
common and internal spanning tree (CIST) runs on this interface.
If a switch port is connected to a switch running prestandard Cisco IOS software, you must use the
spanning-tree mst pre-standard interface configuration command on the port. If you do not configure
the port to send only prestandard BPDUs, the Multiple STP (MSTP) performance might diminish.
Note
When the port is configured to automatically detect prestandard neighbors, the prestandard flag always appears
in the show spanning-tree mst commands.
Examples
This example shows how to configure a port to transmit only prestandard BPDUs:
Switch(config-if)# spanning-tree mst pre-standard
Related Commands
DescriptionCommand
Enables BPDU filtering on the interface.
spanning-tree bpdufilter
Enables BPDU guard on the interface.
spanning-tree bpduguard
Enables PortFast on the interface.
spanning-tree portfast (interface configuration)
Catalyst 2960-X Switch Layer 2 Command Reference, Cisco IOS Release 15.0(2)EX
100 OL-29043 -01
Layer 2 Commands
spanning-tree mst pre-standard

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