Cisco Catalyst 2960-X Command Reference

spanning-tree portfast (global configuration)
To enable bridge protocol data unit (BPDU) filtering on PortFast-enabled interfaces, the BDPU guard feature
on PortFast-enabled interfaces, or the PortFast feature on all nontrunking interfaces, use the
spanning-treeportfast command in global configuration mode. To return to the default settings, use the no
form of this command.
spanning-tree portfast {bpdufilter default| bpduguard default| default}
no portfast {bpdufilter default| bpduguard default| default}
Syntax Description
Enables BDPU filtering on PortFast-enabled interfaces and prevents the
switch interface connect to end stations from sending or receiving BPDUs.
bdpufilter default
Enables the BDPU guard feature on PortFast-enabled interfaces and places
the interfaces that receive BPDUs in an error-disabled state.
bdpuguard default
Enables the PortFast feature on all nontrunking interfaces.default
Command Default
Disabled
Command Modes
Global configuration
Command History
ModificationRelease
This command was introduced.Cisco IOS 15.0(2)EX
Usage Guidelines
You can enable these features when the switch is operating in the per-VLAN spanning-tree plus (PVST+)
rapid-PVST+, or the multiple spanning-tree (MST) mode.
Use the spanning-tree portfast bpdufilter default global configuration command to globally enable BPDU
filtering on interfaces that are PortFast-enabled (the interfaces are in a PortFast-operational state). The interfaces
still send a few BPDUs at link-up before the switch begins to filter outbound BPDUs. You should globally
enable BPDU filtering on a switch so that hosts connected to switch interfaces do not receive BPDUs. If a
BPDU is received on a PortFast-enabled interface, the interface loses its PortFast-operational status and BPDU
filtering is disabled.
You can override the spanning-tree portfast bpdufilter default command by using the spanning-tree
portfast bpdufilter interface command.
Catalyst 2960-X Switch Layer 2 Command Reference, Cisco IOS Release 15.0(2)EX
106 OL-29043 -01
Layer 2 Commands
spanning-tree portfast (global configuration)

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