Cisco Systems Catalyst Switch 2940 User Manual

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Data Sheet

Cisco Catalyst

2940 Series Switches

Figure 1

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, and feature a durable metal shell, no fan for silent 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.

The Cisco Catalyst 2940 Series is extremely 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 tool that comes embedded in 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.

The Cisco Catalyst 2940 Series 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	• Switch automatically downloads conﬁguration ﬁle using Dynamic
	Host Conﬁguration Protocol (DHCP).
• Autosensing	• 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.
• Autonegotiating	• Each non-SFP port automatically selects halfor full-duplex
	transmission mode to optimize bandwidth.
• Dynamic Trunking Protocol (DTP)	• Switch ports automatically conﬁgure as trunks if connected to a
	trunk port on another switch or router.
• Port Aggregation Protocol (PAgP)	• Switch ports automatically conﬁgure as Cisco Fast EtherChannel®
and Link Aggregation Control Protocol	groups or IEEE 802.3ad groups when there are multiple links to
(LACP)	another switch, router, or server.
• DHCP Relay	• Allows a DHCP relay agent to broadcast DHCP requests to the
	network DHCP server.
• Default conﬁguration	• The switch can be connected to the network and can forward trafﬁc
	with no conﬁguration.
• Auto-MDIX (media-dependent	• All ports automatically adjust transmit and receive pairs depending
interface crossed-over) (Future)	on cable type (cross-over or straight-through) connected.
• Express Setup	• Web browser utility allows simple switch set up so that even novices
	can perform a basic conﬁguration.

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Table 1 Product Features and Beneﬁts

Feature	Benefit

Availability/Scalability

Superior Redundancy for Fault Backup
• IEEE 802.1D Spanning Tree Protocol	• Ensures loop-free networks simpliﬁes network conﬁguration and
	improves fault tolerance.
• PortFast	• 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 Link Detection (UDLD)	• Unidirectional links automatically detected and disabled to avoid
and Aggressive UDLD	problems such as spanning tree loops; Aggressive Mode
	automatically retries the link periodically to see if it has returned to
	bidirectional.
• Switchport Autorecovery	• Automatically attempts to re-enable a link that is disabled due to a
	network error (also known as “errdisable recovery”).
• BPDU Guard	• Shuts down Spanning-Tree Protocol PortFast-enabled interfaces
	when Bridge Protocol Data Units (BPDUs) are received to avoid
	accidental topology loops.
• Spanning Tree Root Guard (STRG)	• Prevents edge devices not in the network administrator’s control
	from becoming Spanning Tree Protocol root nodes.
• UplinkFast/BackboneFast	• Ensure quick fail-over recovery enhancing overall network stability
	and reliability.

Bandwidth Availability
• Per-port broadcast, multicast, and unicast	• Prevents faulty end stations from degrading overall systems
storm control	performance.
• Per VLAN Spanning Tree Plus (PVST+)	• Allows for Layer 2 load sharing on redundant links to utilize the full
	capacity of a redundant design.
• VLAN Trunking Protocol (VTP) pruning	• Limits bandwidth consumption on VTP trunks by limiting broadcast
	trafﬁc only to trunk links required to reach the destination devices.
• Internet Group Management Protocol	• Provides bandwidth-intensive multicast trafﬁc to only the
(IGMP) Snooping	requestors, rather than ﬂooding all ports. Support for IGMP version
	1 and 2.
• IGMP immediate-leave processing	• Faster than normal multicast leave processing, this prunes out
	unnecessary multicast trafﬁc immediately after a leave request.
• Multicast VLAN Registration (MVR)	• 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)	• Ability to prioritize trafﬁc and put it in different queues.
• Mark/override 802.1P CoS per port	• Network administrator can enforce QoS policies, and prevent users
	from abusing QoS settings.
• 4 egress queues per port	• Enables network trafﬁc to be put into 4 different queues, depending
	on the CoS priority.
• Weighted Round Robin (WRR)	• High priority queues can be allocated more time to send trafﬁc.
scheduling	However, WRR also ensures lower priority queues are not
	neglected.
• Strict Priority scheduling	• Guarantees that the highest-priority packets are serviced ahead of
	all other trafﬁc. Particularly useful for time-sensitive applications like
	voice over IP.

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Table 1 Product Features and Beneﬁts

Feature	Benefit

Security

Network Management Security
• VLAN1 minimization	• Allows VLAN1 to be disabled on any individual VLAN trunk link.
• TACACS+ and RADIUS Authentication	• 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.
• Multilevel management levels	• Allows for 15 levels of switch management authorization, ranging
	from read-only to full read/write capabilities.

Network Edge Security
• IEEE 802.1x	• Allows dynamic, port-based security, providing user authentication.
• Voice VLAN 802.1x bypass	• Permits an IP phone to access the voice VLAN irrespective of the
	authorized or unauthorized state of the port.
• Private VLAN Edge	• Provides security and isolation between switch ports, which helps
	ensure that users cannot snoop on other users’ trafﬁc.
• SPAN for IDS	• 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.
• MAC address notiﬁcation	• Allows administrators to be notiﬁed of users added to or removed
	from the network. Good for tracking location of users or stolen
	laptops.
• Port security	• 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.
• Autotrusted boundary	• 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.
• IGMP ﬁltering	• Provides multicast authentication by filtering out non-subscribers and
	limits the number of concurrent multicast streams available per port.
• Dynamic VLAN Assignment	• 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).

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