Cisco Systems 2950SX-24 User Manual

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Data Sheet

Cisco Catalyst 2950 Series Switches

with Standard Image Software

Product Overview

The Cisco® Catalyst® 2950SX-48,2950T-48,2950SX-24,2950-24,and2950-12switches, members of the Cisco Catalyst 2950 Series, are standalone,fixed-configuration,managed10/100-Mbpsswitches providing basic workgroup connectivity for small to midsize networks. Thesewire-speeddesktop switches come with Standard Image software features and offer Cisco IOS® Software functions for basic data, voice, and video services at the edge of the network. Embedded in all Cisco Catalyst 2950 Series switches is the Cisco Cluster Management Suite (CMS) software, which allows users to simultaneously configure and troubleshoot multiple Cisco Catalyst desktop switches using a standard Web browser. In addition, with the newly launched Cisco Express Setup, users now have the option to set up the switch through a Web browser, eliminating the need for more complex terminal emulation programs and knowledge of thecommand-lineinterface (CLI). Cisco Express Setup reduces the cost of deployment by enablingless-skilledpersonnel to set up switches quickly. This product line offers two distinct sets of software features and a range of configurations to allow small, midsize, and enterprise branch offices to select the right combination for the network edge. For networks that require additional security, advanced quality of service (QoS), and high availability, Enhanced Image software delivers intelligent services such as rate limiting and security filtering for deployment at the network edge.

The Cisco Catalyst 2950SX-48,2950T-48,2950SX-24,2950-12and2950-24switches (Figures1–5)are available only with the Standard Image (SI) software for the Cisco Catalyst 2950 Series.

Cisco Catalyst 2950SX-48 Switch—4810/100-Mbpsports with two fixed1000BASE-SXuplinks

Cisco Catalyst 2950T-48 Switch—4810/100-Mbpsports with two fixed 10/100/1000BASE-Tuplinks

Cisco Catalyst 2950SX-24 Switch—2410/100-Mbpsports with two fixed1000BASE-SXuplinks

Cisco Catalyst 2950-24Switch— 24 10/100-Mbps ports

Cisco Catalyst 2950-12Switch—12 10/100-Mbps ports

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Figure 1

Cisco Catalyst 2950-12Switch

Figure 2

Cisco Catalyst 2950-24Switch

Figure 3

Cisco Catalyst 2950SX-24Switch

Figure 4

Cisco Catalyst 2950T-48Switch

Figure 5

Cisco Catalyst 2950SX-48Switch

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These switches provide customers with many connectivity and port-densityoptions. The Cisco Catalyst2950-12and Cisco Catalyst2950-24switches provide 12 and 2410/100-Mbpsports, respectively, for edge connectivity. Depending onport-densityrequirements, customers with gigabit fiber uplink connectivity needs can choose between the Cisco Catalyst2950SX-24Switch, which provides 2410/100-Mbpsports and 2 integrated1000BASE-SXports, and the Cisco Catalyst2950SX-48Switch, which provides 4810/100-Mbpsports and 2 integrated1000BASE-SXports.

With these integrated ports, customers get an extremely cost-effectivesolution for delivering gigabit speeds using fiber. These switches are ideal for education and government segments where fiber uplinks are required. For customers that do not need fiber connectivity, the Cisco Catalyst2950T-48Switch with 4810/100-Mbpsports and two integrated 10/100/1000BASE-Tports is acost-effectivealternative. The 10/100/1000BASE-Tports can be used for server connectivity or for uplink connectivity to distribution or other switches. Dual ports also provide redundancy and increased availability, as well as provide acost-effectivemeans for cascading switches and managing them as a cluster. The Cisco Catalyst 2950 Series Intelligent Ethernet switches with Enhanced Image software arefixed-configurationmodels that bring intelligent services, such as advanced QoS, enhanced security, and high availability to the network edge while maintaining the simplicity of traditional LAN switching. Combining a Cisco Catalyst 2950 Series Intelligent Ethernet Switch with a Cisco Catalyst 3550 Series Switch enables IP routing from the edge to the core of the network. Refer to the Cisco Catalyst 2950 Series Enhanced Image Data Sheet for more information:

Network Availability with Wire-SpeedPerformance in Connecting End Stations

to the LAN

With a switching fabric of 13.6 Gbps and a maximum forwarding bandwidth of 13.6 Gbps, Cisco Catalyst 2950 Series switches deliver wire-speedperformance on all ports in connecting end stations and users to the company LAN. Cisco Catalyst 2950 Series switches with basic services supportperformance-boostingfeatures such as Cisco Fast EtherChannel® to providehigh-performancebandwidth between Cisco Catalyst switches, routers, and servers.

Network Security

Cisco Catalyst 2950 Series switches offer enhanced data security through a wide range of security features. These features allow customers to provide network security based on users or MAC addresses. The security enhancements are available free by downloading the latest software for the Cisco Catalyst 2950 Series switches.

Private VLAN Edge isolates ports on a switch, ensuring that traffic travels directly from the entry point to the aggregation device through a virtual path and cannot be directed to another port. In addition, for authentication of users with a TACACS+ or a RADIUS server, 802.1x provides port-levelsecurity. Simple Network Management Protocol Version 3 (SNMPv3)(non-crypto)monitors and controls network devices as well as manages configurations, performance, collection of statistics, and security.

With the Cisco Catalyst 2950SX-48,2950T-48,2950SX-24,2950-24,and2950-12switches, network managers can make ports and consoles highly secure.MAC-address-basedport-levelsecurity prevents unauthorized stations from accessing the switch. Multilevel access security on the switch console and the Web management interface prevents unauthorized users from accessing or altering switch configurations and can be implemented using an internal user database on each switch or a centrally administered TACACS+ or RADIUS server. Using 802.1x in conjunction with

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a RADIUS server allows dynamic port-baseduser authentication. In addition, 802.1x can coexist with port security on aper-portbasis. Security features can be deployed using Cisco CMS software security wizards, which ease the deployment of security features that restrict user access to a server or portion of the network or restrict the applications used in certain areas of the network.

Network Control

Cisco Catalyst 2950SX-48,2950T-48,2950SX-24,2950-24,and2950-12switches deliverLAN-edgeQoS, supporting two modes of reclassification. Onemode—basedon the IEEE 802.1pstandard—honorstheclass-of-service(CoS) value at the ingress point and assigns the packet to the appropriate queue. In the second mode, packets can be reclassified based on a default CoS value assigned to the ingress port by the network administrator. In the case of frames that arrive without a CoS value (such as untagged frames), these Cisco Catalyst 2950 Series switches support classification based on a default CoS value per port assigned by the network administrator. After the frames have been classified or reclassified using one of the above modes, they are assigned to the appropriate queue at the egress. Cisco Catalyst 2950 Series switches support four egress queues, which allow the network administrator to be more discriminating and granular in assigning priorities for the various applications on the LAN. Strict Priority Scheduling configuration ensures thattime-sensitiveapplications, such as voice, always follow an expedited path through the switch fabric. Weighted Round Robin (WRR) scheduling, another significant enhancement, ensures thatlower-prioritytraffic receives attention without comprising the priority settings administered by a network manager. These features allow network administrators to prioritizemission-critical,time-sensitivetraffic, such as voice (IP telephony traffic), enterprise resource planning (Oracle, SAP, etc.), andcomputer-assisteddesign and manufacturing, over lesstime-sensitiveapplications such as FTP ore-mail(Simple Mail Transfer Protocol).

Network Availability

To provide efficient use of resources for bandwidth-hungryapplications like multicasts, Cisco Catalyst 2950 Series switches support Internet Group Management Protocol Version 3 (IGMPv3) snooping in hardware. Through the support and configuration of IGMP snooping through the Cisco CMS software, these Cisco Catalyst 2950 Series switches deliver outstanding performance and ease of use in administering and managing multicast applications on the LAN.

The IGMPv3 snooping feature allows the switch to “listen in” on the IGMP conversation between hosts and routers. When a switch hears an IGMP join request from a host for a given multicast group, the switch adds the host’s port number to the group destination address list for that group. And when the switch hears an IGMP leave request, it removes the host’s port from the content-addressablememory (CAM) table entry.

Multicast VLAN Registration (MVR) is designed for applications using wide-scaledeployment of multicast traffic across an Ethernetring-basedservice provider network (for example, the broadcast of multiple television channels over aservice-providernetwork). MVR allows a subscriber on a port to subscribe and unsubscribe to a multicast stream on the networkwide multicast VLAN.

Per VLAN Spanning Tree Plus (PVST+) allows users to implement redundant uplinks while also distributing traffic loads across multiple links. This is not possible with standard Spanning Tree Protocol implementations. Cisco UplinkFast technology ensures immediate transfer to the secondary uplink, much better than the traditional 30to 60-secondconvergence time. This is yet another enhancement of the Spanning Tree Protocol implementation. An

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