Cisco Catalyst 2960-X Command Reference

spanning-tree portfast (interface configuration)
To enable PortFast mode where the interface is immediately put into the forwarding state upon linkup without
waiting for the timer to expire, use the spanning-tree portfast command in interface configuration mode.
To return to the default settings, use the no form of this command.
spanning-tree portfast [disable| trunk]
no spanning-tree portfast
Syntax Description
(Optional) Disables PortFast on the interface.disable
(Optional) Enables PortFast edge mode on the interface.trunk
Command Default
The settings that are configured by the spanning-treeportfastdefault command.
Command Modes
Interface configuration
Command History
ModificationRelease
This command was introduced.Cisco IOS 15.0(2)EX
Usage Guidelines
You can enable this feature when the switch is operating in the per-VLAN spanning-tree plus (PVST+), Rapid
PVST+, or the multiple spanning-tree (MST) mode.
This feature affects all VLANs on the interface.
Use this command only on interfaces that connect to end stations; otherwise, an accidental topology loop
could cause a data-packet loop and disrupt the switch and network operation.
To enable PortFast on trunk ports, you must use the spanning-tree portfast trunk interface configuration
command. The spanning-tree portfast command is not supported on trunk ports.
An interface with the PortFast feature enabled is moved directly to the spanning-tree forwarding state without
the standard forward-time delay.
You can use the spanning-tree portfast default global configuration command to globally enable the PortFast
feature on all nontrunking interfaces. Use the spanning-tree portfast interface configuration command to
override the global setting.
If you configure the spanning-tree portfast default global configuration command, you can disable PortFast
on an interface that is not a trunk interface by using the spanning-tree portfast disable interface configuration
command.
Catalyst 2960-X Switch Layer 2 Command Reference, Cisco IOS Release 15.0(2)EX
108 OL-29043 -01
Layer 2 Commands
spanning-tree portfast (interface 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