Cisco Systems Catalyst Switch 2940 User Manual

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Data Sheet

Cisco Catalyst

2940 Series Switches

The Cisco® Catalyst® 2940 Series switches are small, standalone, managed
switches with eight Fast Ethernet ports and a single integrated Fast Ethernet or
Gigabit Ethernet uplink. The switches are designed to be used outside the wiring
closet in the end-user workspace,andfeature a durable metal shell, no fanforsilent
operation, easy wall or under-the-desk mounting, a security lock slot to prevent
theft, and an available cable guard to secure the Ethernet cables and switch.

Figure 1

Cisco Catalyst 2940
Series Switches

The CiscoCatalyst2940Seriesisextremely
easy to set up and configure via Cisco
Express Setup, a simple Web-Based setup
utility. For more advanced configuration
and ongoing management, the Cisco
Catalyst 2940 Series has a console port and
supports remote management protocols
such as Telnet, Simple Network
Management Protocol (SNMP), as well as
the Cisco Cluster Management Suite
(CMS), which is a free Java-enabled
Web-based monitoring and configuration
toolthat comes embeddedin the switch and
can manage up to 16 switches at once.
Combine this with the rich functionality of
Cisco IOS

®

Software, and these switches
provide comprehensive functionality and
manageability for classrooms, conference
rooms, or other very small workgroup
environments.

TheCisco Catalyst 2940Series is supported
by a limited lifetime warranty and free
software updates for life to keep the switch
current with new standards and
technologies. In summary, the Cisco
Catalyst 2940 Series switches provide the
lowest total cost of ownership in their
product class with their durable design,
simple installation and management, and
award-winning Cisco support.

Configurations

• Cisco Catalyst 2940-8TT:

– Eight 10/100 ports
– One 10/100/1000BASE-T port

• Cisco Catalyst 2940-8TF:

– Eight 10/100 ports
– One 100BASE-FX port and One

1000BASE-X Small Form-factor
Pluggable (SFP) slot (only one active
port at a time)

Accessory

• Cisco Catalyst 2940 Series Cable Guard
– Helps prevent switch theft as well as

prevent tampering or removal of
Ethernet cables

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Rich IOS Functionality

The Cisco Catalyst 2940 Series supports a Cisco IOS Software feature set that is nearly identical to that offered in
the Standard Image Cisco Catalyst 2950 Series switches. This functionality provides:

• Support for network edge security to prevent unauthorized users

• Quality-of-service capabilities for basic data, video, and voice applications

• High-availability features to ensure user productivity

• Full network management support.

More details about the Cisco IOS functions are described below in Table 1. Currently, the only difference from the
Cisco Catalyst 2950 Standard Image is that the 2940 Series supports only four virtual LANs (VLANs) and four
Spanning Tree Protocol (STP) instances.

Product Specifications

Table 1 Product Features and Benefits

Feature Benefit

Ease of Use and Ease of Deployment

• Autoconfiguration

• Autosensing

• Autonegotiating

• Dynamic Trunking Protocol (DTP)

• Port Aggregation Protocol (PAgP)
and Link Aggregation Control Protocol
(LACP)

• DHCP Relay

• Default configuration

• Auto-MDIX (media-dependent
interface crossed-over) (Future)

• Express Setup

• Switch automatically downloads configuration file using Dynamic
Host Configuration Protocol (DHCP).

• Each non-SFP port detects the speed of the attached device and
automatically configures the port for 10-, 100-, or 1000-Mbps
operation, easing switch deployment in mixed 10, 100, and
1000BASE-T environments.

• Each non-SFP port automatically selects half- or full-duplex
transmission mode to optimize bandwidth.

• Switch ports automatically configure as trunks if connected to a
trunk port on another switch or router.

• Switch ports automatically configure as Cisco Fast EtherChannel

®

groups or IEEE 802.3ad groups when there are multiple links to
another switch, router, or server.

• Allows a DHCP relay agent to broadcast DHCP requests to the
network DHCP server.

• The switch can be connected to the network and can forward traffic
with no configuration.

• All ports automatically adjust transmit and receive pairs depending
on cable type (cross-over or straight-through) connected.

• Webbrowser utility allows simple switch set up so that even novices
can perform a basic configuration.

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Availability/Scalability
Superior Redundancy for Fault Backup

• IEEE 802.1D Spanning Tree Protocol

• PortFast

• UniDirectional Link Detection (UDLD)
and Aggressive UDLD

• Switchport Autorecovery

• BPDU Guard

• Spanning Tree Root Guard (STRG)

• UplinkFast/BackboneFast

• Ensures loop-free networks simplifies network configuration and
improves fault tolerance.

• Transitions a port directly to forwarding state after linkup, allowing
users to connect to the network in 2–3 seconds, rather than waiting
~50 seconds for spanning tree to resolve.

• Unidirectional links automatically detected and disabled to avoid
problems such as spanning tree loops; Aggressive Mode
automatically retries the link periodically to see if it has returned to
bidirectional.

• Automatically attempts to re-enable a link that is disabled due to a
network error (also known as “errdisable recovery”).

• Shuts down Spanning-Tree Protocol PortFast-enabled interfaces
when Bridge Protocol Data Units (BPDUs) are received to avoid
accidental topology loops.

• Prevents edge devices not in the network administrator’s control
from becoming Spanning Tree Protocol root nodes.

• Ensure quick fail-over recovery enhancing overall network stability
and reliability.

Bandwidth Availability

• Per-port broadcast, multicast, and unicast
storm control

• Per VLAN Spanning Tree Plus (PVST+)

• VLAN Trunking Protocol (VTP) pruning

• Internet Group Management Protocol
(IGMP) Snooping

• IGMP immediate-leave processing

• Multicast VLAN Registration (MVR)

• Prevents faulty end stations from degrading overall systems
performance.

• Allows for Layer 2 load sharing on redundant links to utilize the full
capacity of a redundant design.

• Limits bandwidth consumption on VTP trunks by limiting broadcast
traffic only to trunk links required to reach the destination devices.

• Provides bandwidth-intensive multicast traffic to only the
requestors, rather than flooding all ports. Support for IGMP version
1 and 2.

• Faster than normal multicast leave processing, this prunes out
unnecessary multicast traffic immediately after a leave request.

• Allows multicast streams in a single networkwide multicast VLAN
while subscribers remain in separate VLANs for bandwidth and
security reasons.

Quality of Service/Control
Advanced Quality of Service

• Honor 802.1p class of service (CoS)

• Mark/override 802.1P CoS per port

• 4 egress queues per port

• Weighted Round Robin (WRR)
scheduling

• Strict Priority scheduling

• Ability to prioritize traffic and put it in different queues.

• Network administrator can enforce QoS policies, and prevent users
from abusing QoS settings.

• Enables network traffic to be put into 4 different queues, depending
on the CoS priority.

• High priority queues can be allocated more time to send traffic.
However, WRR also ensures lower priority queues are not
neglected.

• Guarantees that the highest-priority packets are serviced ahead of
all other traffic. Particularlyuseful for time-sensitiveapplications like
voice over IP.

Table 1 Product Features and Benefits

Feature Benefit

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Security
Network Management Security

• VLAN1 minimization

• TACACS+ and RADIUS Authentication

• Multilevel management levels

• Allows VLAN1 to be disabled on any individual VLAN trunk link.

• Terminal Access Controller Access Control System Plus (TACACS+)
and Remote Authentication Dial-In User Service (RADIUS)
authentication enable centralized control of switch administration
and management.

• Allows for 15 levels of switch management authorization, ranging
from read-only to full read/write capabilities.

Network Edge Security

• IEEE 802.1x

• Voice VLAN 802.1x bypass

• Private VLAN Edge

• SPAN for IDS

• MAC address notification

• Port security

• Autotrusted boundary

• IGMP filtering

• Dynamic VLAN Assignment

• Allows dynamic, port-based security, providing user authentication.

• Permits an IP phone to access the voice VLAN irrespective of the
authorized or unauthorized state of the port.

• Provides security and isolation between switch ports, which helps
ensure that users cannot snoop on other users’ traffic.

• Bidirectional data support on the Switched Port Analyzer (SPAN)
port allows Cisco Secure Intrusion Detection System (IDS) to take
action when an intruder is detected.

• Allows administrators to be notified of users added to or removed
from the network. Good for tracking location of users or stolen
laptops.

• Secures the access to an access or trunk port based on MAC
address. After a specific timeframe, the aging feature removes the
MAC address from the switch to allow another device to connect to
the same port.

• Ability to trust the QoS priority settings if an IP phone is present and
to disable the trust setting in the event that the IP phone is removed,
thereby preventing a malicious user from overriding prioritization
policies in the network.

• Providesmulticast authentication by filtering out non-subscribers and
limits the number of concurrent multicast streams available per port.

• Using VLAN Membership Policy Server (VMPS) client functionality,
ports can be assigned to VLANs based on the MAC address
connected to the port or a user login (using the CiscoWorks User
Registration Tool).

Table 1 Product Features and Benefits

Feature Benefit

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Manageability
Superior Manageability

• SNMPv1/2/3 (non-crypto) and robust
MIB support

• Cisco IOS CLI

• Telnet and console access

• Service Assurance Agent (SAA)

• 802.1q VLANs

• Voice VLAN

• VTP

• Remote Monitoring (RMON)

• Layer 2 Traceroute

• Switch Port Analyzer (SPAN) port

• Trivial File Transfer Protocol (TFTP)

• Network Time Protocol (NTP)

• Multifunction LEDs per port

• Switch-level Status LEDs

• Enables full management of switches via standard network
management tools.

• Provides common user interface and command set with all Cisco
routers and Cisco Catalyst desktop switches, minimizing training costs.

• Telnet provides comprehensive remote in-band management, while
console port enables out-of-band management.

• Facilitates service-level management by providing network
response time measurements.

• Up to 4 802.1Q VLANs per switch, as well as 1005 VLAN IDs. Any
port can be a VLAN trunk port.

• Simplifies IP telephony installations by keeping voice traffic on
a separate VLAN for easier administration and troubleshooting.

• Propogates VLAN and trunk configuration across all switches in
the network.

• For enhanced traffic management, monitoring, and analysis, the
Embedded Remote Monitoring (RMON) software agent supports
4 RMON groups (history, statistics, alarms, and events). All 9 RMON
groups are supported when using SPAN to mirror traffic to an
RMON probe or network analyzer.

• Eases troubleshooting by identifying the physical path that a packet
takes from source to destination.

• Mirrors traffic from a port or group of ports to a single destination
port, where a network analyzer or RMON probe can be connected.
1 SPAN session only.

• Reduces the cost of administering software upgrades by
downloading from a centralized server.

• Provides an accurate and consistent timestamp to all intranet
switches.

• For port up/down status; half-duplex and full-duplex mode; and
10BASE-T, 100BASE-TX, and 1000BASE-T indication.

• Provides easy visual indication of system integrity status.

Table 1 Product Features and Benefits

Feature Benefit

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Cluster Management Suite
Web-based Management

• Supports up to 16 switches with single
IP address

• 1-click software upgrade

• Configuration cloning

• Guide Mode

• Context-sensitive Help

• Topology map

• Front panel view

• Multidevice and multiport configuration

• Cisco Aironet

®

Wireless Access Point

Management

• User-personalized interface

• Alarm notification

• Provides an easy-to-use, Web-based management interface through
a standard Web browser. Simplifies management and saves time,
without the limitation of being physically located in the same wiring
closet.

• Entire cluster of Cisco Catalyst 2940 switches can be upgraded at once.

• Enables rapid deployment of networks.

• Makes it easy to configure powerful advanced features by providing
step-by-step instructions.

• Saves time by providing help on the feature currently being used.

• Provides a view of up to 16 switches interconnected and their
up/down status, and link speeds and settings.

• Provides a front panel view of up to 16 switches and their up/down
status of ports. Also can be used to select ports across all the
switches to be configured simultaneously.

• Saves time and resources.

• Web-based management for Aironet devices can be launched by
clicking the relevant icon in the topology map.

• Customize polling intervals, table views, and other settings within
Cisco CMS Software and retains these settings.

• Automated e-mail notification of network errors and alarm thresholds.

CiscoWorks Support

• Supported by CiscoWorks LAN
Management Solution (LMS), Access
Control Server (ACS), Small Network
Management Solution (SNMS), and
CiscoWorks for Windows

• Cisco Discovery Protocol (CDP) v1, v2

• CiscoWorks network-management software provides management
capabilities on a per-portand per-switchbasis, providing a common
management interface for all Cisco routers, switches, hubs, and
other Cisco devices. The CiscoWorks tools save time and reduce
human errors.

• Enable a CiscoWorks network-management station to automatically
discover and map switches.

Table 1 Product Features and Benefits

Feature Benefit

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Table 2 Hardware Specifications

Description Specification

Performance • 3.6 Gbps maximum forwarding bandwidth

• 2.7 Mpps wire-speed forwarding rate (based on 64-byte packets)

• 16 MB DRAM and 8 MB Flash memory

• Configurable up to 8000 MAC addresses

• Configurable up to 255 multicast groups

• Configurable maximum transmission unit (MTU) of up to 1500 bytes

• 4 802.1Q VLANs

• 1005 VLAN IDs

100BASE-FX fiber-port
power levels

Optical transmitter wavelength: 1300 nm (nanometer)
Optical receiver sensitivity for 50/125-micron cabling: –33.5 to –11.8 dBm (decibel

milliwatt)
Optical receiver sensitivity for 62.5/125-micron cabling: –33.5 to –11.8 dBm
Optical transmitter power for 50/125-micron cabling: –23.5 to –14 dBm
Optical transmitter power for 62.5/125-micron cabling: –20 to –14 dBm

Connectors and cabling • 10BASE-T ports: RJ-45 connectors; 2-pair Category 3, 4, or 5 unshielded

twisted-pair (UTP) cabling

• 100BASE-TX ports: RJ-45 connectors; 2-pair Category 5 UTP cabling

• 1000BASE-T ports: RJ-45; 2-pair Category 5 UTP cabling

• 100BASE-FX ports: MT-RJ connectors, 50/125 or 62.5/125 micron multimode
fiber-optic cabling

• 1000BASE-SX, -LX/LH, -T SFP-based port: LC fiber connectors, single-mode or
multimode fiber, and RJ-45 connector for copper

• Management console port: Use RJ-45-to-DB9 cable for PC connections

Power connectors • The internal power supply is an autoranging unit, supporting input voltages

between 100 and 240 volts alternating current (VAC)

• Use the supplied AC power cord to connect the AC power connector to an
AC power outlet

Indicators • Per-port status LEDs: link integrity, disabled, activity, speed, and full-duplex

indications

• System-status LED

Dimensions (H x W x D) 1.55 x 10.6 x 6.42 in.

(3.94 x 26.92 x 16.3 cm)

Weight 3 lb (1.36 kg)
Environmental Ranges • Operating temperature 32 to 113 F (0 to 45 C)

• Storage temperature –13 to 158 F (–25 to 70 C)

• Operating humidity 10 to 85% (noncondensing)

• Operating altitude up to 10,000 ft (3000 m)

• Storage altitude up to 15,000 ft (4570 m)

Acoustic Noise International Organization for Standardization (ISO) 7779:

bystander position operating to an ambient temperature of 30 C: 0 decibels (dB)

Telco CLEI Code • 2940-8TF: CNMEG00ARA

• 2940-8TT: CNMEH00ARA

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Mean Time Between Failure
(MTBF)—Predicted

• 2940-8TF: 636,000 hrs (73 yrs)

• 2940-8TT: 771,000 hrs (88 yrs)

Warranty • Limited lifetime warranty

Table 3 Power Specifications

Description Specification

Power Consumption 15W (maximum)

50 Btus per hour

AC input voltage/frequency 100 to 240 VAC (autoranging), 50 to 60 Hz

Table 4 Management and Standards Support

Description Specification

Management Information Bases
(MIBs)

BRIDGE-MIB.my
ENTITY-MIB.my
CISCO-2900-MIB.my
CISCO-CDP-MIB.my
CISCO-CONFIG-MAN-MIB.my
CISCO-IMAGE-MIB.my
CISCO-MEMORY-POOL-MIB.my
CISCO-PING-MIB.my
CISCO-PRODUCTS-MIB.my
CISCO-TCP-MIB.my
IF-MIB (RFC 1573)
OLD-CISCO-CHASSIS-MIB.my
OLD-CISCO-CPU-MIB.my
OLD-CISCO-INTERFACES-MIB.my
OLD-CISCO-IP-MIB.my
OLD-CISCO-MEMORY-MIB.my
OLD-CISCO-SYSTEM-MIB.my
OLD-CISCO-TCP-MIB.my
OLD-CISCO-TS-MIB.my
RFC1213-MIB (MIB-II)
RFC1398-MIB (ETHERNET-MIB)
RMON-MIB (RFC 1757)- 4 Groups
SNMPv2-MIB.my
TCP-MIB.my
UDP-MIB.my
CISCO-VLAN-MEMBERSHIP-MIB.my
CISCO-SMI.my
CISCO-TC.my
CISCO-VTP-MIB.my
IANAifType-MIB.my

Table 2 Hardware Specifications

Description Specification

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Management Information Bases
(MIBs)

RS-232-MIB.my
SNMPv2-SMI.my
SNMPv2-TC.myCISCO-STP-EXTENSIONS-MIB.my
CISCO-CLUSTER-MIB.my
CISCO-FLASH-MIB.my
CISCO-PROCESS-MIB.my
CISCO-MAC-NOTIFICATION-MIB.my
CISCO-PAGP-MIB.my
CISCO-IGMP-FILTER-MIB
CISCO-RTTMON-MIB
CISCO-BULK-FILE-MIB
CISCO-CONFIG-COPY-MIB
CISCO-ENVMON-MIB
CISCO-FTP-CLIENT-MIB
CISCO-SYSLOG-MIB
CISCO-STACKMAKER-MIB
CISCO-PORT-SECURITY-MIB.my

Standards IEEE 802.1x

IEEE 802.3ad
IEEE 802.3x full duplex on 10BASE-T, 100BASE-TX, and 1000BASE-T ports
IEEE 802.1D Spanning-Tree Protocol
IEEE 802.1p CoS Prioritization
IEEE 802.1Q VLAN
IEEE 802.3 10BASE-T specification
IEEE 802.3u 100BASE-TX specification
IEEE 802.3ab 1000BASE-T specification
IEEE 802.3z 1000BASE-X specification
1000BASE-SX
1000BASE-LX/LH
RMON I and II standards
SNMPv1, SNMPv2c, SNMPv3 (non-crypto)

Table 5 Compliance

Safety certifications • UL to UL 60950, Third Edition

• C-UL to CAN/CSA C22.2 No. 60950-00, Third Edition

• TUV/GS to EN 60950:2000

• CB to IEC 60950 with all country deviations

• NOM to NOM-019-SCFI

• CE Marking

Table 4 Management and Standards Support

Description Specification

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Service and Support

Cisco Systems® is committed to minimizing total cost of ownership (TCO). Cisco offers a portfolio of Technical
Support Services to help ensure that Cisco products operate efficiently,remain highly available, and benefit from the
most up-to-date system software. The services and support programs described in the table below are available as
part of the Cisco Desktop Switching Service and Support solution, and are available directly from Cisco and through
resellers.

Electromagnetic Compatability • FCC Part 15 Class A

• EN 55022: 1998 (CISPR22)

• EN 55024: 1998 (CISPR24)

• VCCI Class A

• AS/NZS 3548 Class A

•CE

• CNS 13438 Class A

• MIC

Table 6 Service and Support Products, Features, and Benefits

Service and Support Features Benefits

Advanced Services

Cisco Total Implementation
Solutions (TIS), available direct
from Cisco

Cisco Packaged TIS, available
through resellers

• Project management

• Site survey, configuration, and
deployment

• Installation, test, and cutover

• Training

• Major moves, adds, and changes

• Design review and product staging

• Supplements existing staff

• Ensures functions meet needs

• Mitigates risk

Technical Support Services

Cisco SMARTnet™ and SMARTnet
Onsite, available direct from Cisco

Cisco Packaged SMARTnet,
available through resellers

• 24-hour access to software updates

• Web access to technical
repositories

• Telephone support through the
Cisco Technical Assistance Center
(TAC)

• Advance replacement of hardware
parts

• Enables proactive or expedited
issue resolution

• Lowers TCO by taking advantage of
Cisco expertise and knowledge

• Minimizes network downtime

Table 5 Compliance

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For more information about Cisco products, contact:

• United States and Canada: (toll free) 800 553-NETS (6387)

• Europe: 32 2 778 4242

• Australia: 612 9935 4107

• Other: 408 526-7209

• World Wide Web URL:
http://www.cisco.com

Table 7 Ordering Information

Product Number Product Description

WS-C2940-8TF-S • 8 Ethernet 10/100 ports + 1 Ethernet 100BASE-FX + 1 1000BASE-X SFP port

(1 uplink active at a time)

• Wall-mountable, standalone, managed switch

WS-C2940-8TT-S • 8 Ethernet 10/100 ports + 1 Ethernet 10/100/1000BASE-T

• Wall-mountable, standalone, managed switch

CABLEGUARD-C2940= • Cable Guard for the Cisco Catalyst 2940 Series Switches secures switchand

prevents tampering with Ethernet cable jacks

Table 8 Compatible Small Form-Factor Pluggable (SFP) Transceivers for the Cisco Catalyst 2940-8TF Switch

Product Number Product Description

GLC-LH-SM= 1000BASE-LX/LH Gigabit Ethernet SFP, LC connector, LH transceiver
GLC-SX-MM= 1000BASE-SX Gigabit Ethernet SFP, LC connector, SX transceiver

Table 9 Compatible Fiber Patch Cables for the Cisco Catalyst 2940-8TF Switch MT-RJ Connectors

Product Number Product Description

CAB-MTRJ-SC-MM-1M= 1-meter, MT-RJ-to-SC multimode cable
CAB-MTRJ-ST-MM-1M= 1-meter, MT-RJ-to-ST multimode cable
CAB-MTRJ-SC-MM-3M= 3-meter, MT-RJ-to-SC multimode cable
CAB-MTRJ-ST-MM-3M= 3-meter, MT-RJ-to-ST multimode cable
CAB-MTRJ-SC-MM-5M= 5-meter, MT-RJ-to-SC multimode cable
CAB-MTRJ-ST-MM-5M= 5-meter, MT-RJ-to-ST multimode cable

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