Cisco Systems 2950T-48, 2950-12, 2950SX-24, 2950SX-48, 2950-24 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, and 2950-12 switches, members of the Cisco Catalyst 2950 Series, are standalone, ﬁxed-conﬁguration, managed 10/100-Mbps switches providing basic workgroup connectivity for small to midsize networks. These wire-speed desktop 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 the command-line interface (CLI). Cisco Express Setup reduces the cost of deployment by enabling less-skilled personnel 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, 2950-12 and 2950-24 switches (Figures 1–5) are available only with the Standard Image (SI) software for the Cisco Catalyst 2950 Series.

•Cisco Catalyst 2950SX-48 Switch—48 10/100-Mbps ports with two ﬁxed 1000BASE-SX uplinks

•Cisco Catalyst 2950T-48 Switch—48 10/100-Mbps ports with two ﬁxed 10/100/ 1000BASE-T uplinks

•Cisco Catalyst 2950SX-24 Switch—24 10/100-Mbps ports with two ﬁxed 1000BASE-SX uplinks

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

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

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Cisco Systems 2950T-48, 2950-12, 2950SX-24, 2950SX-48, 2950-24 User Manual

Figure 1

Cisco Catalyst 2950-12 Switch

Figure 2

Cisco Catalyst 2950-24 Switch

Figure 3

Cisco Catalyst 2950SX-24 Switch

Figure 4

Cisco Catalyst 2950T-48 Switch

Figure 5

Cisco Catalyst 2950SX-48 Switch

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These switches provide customers with many connectivity and port-density options. The Cisco Catalyst 2950-12 and Cisco Catalyst 2950-24 switches provide 12 and 24 10/100-Mbps ports, respectively, for edge connectivity. Depending on port-density requirements, customers with gigabit ﬁber uplink connectivity needs can choose between the Cisco Catalyst 2950SX-24 Switch, which provides 24 10/100-Mbps ports and 2 integrated 1000BASE-SX ports, and the Cisco Catalyst 2950SX-48 Switch, which provides 48 10/100-Mbps ports and 2 integrated 1000BASE-SX ports.

With these integrated ports, customers get an extremely cost-effective solution 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 Catalyst 2950T-48 Switch with 48 10/100-Mbps ports and two integrated 10/100/1000 BASE-T ports is a cost-effective alternative. The 10/100/1000 BASE-T ports 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 a cost-effective means for cascading switches and managing them as a cluster. The Cisco Catalyst 2950 Series Intelligent Ethernet switches with Enhanced Image software are ﬁxed-conﬁguration models 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: http://www.cisco.com/en/US/partner/products/hw/switches/ps628/products_data_sheet09186a00801a0c5b.html

Network Availability with Wire-Speed Performance 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-speed performance on all ports in connecting end stations and users to the company LAN. Cisco Catalyst 2950 Series switches with basic services support performance-boosting features such as Cisco Fast EtherChannel® to provide high-performance bandwidth 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-level security. 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, and 2950-12 switches, network managers can make ports and consoles highly secure. MAC-address-based port-level security 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-based user authentication. In addition, 802.1x can coexist with port security on a per-port basis. 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, and 2950-12 switches deliver LAN-edge QoS, supporting two modes of reclassiﬁcation. One mode—based on the IEEE 802.1p standard—honors the class-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 that time-sensitive applications, such as voice, always follow an expedited path through the switch fabric. Weighted Round Robin (WRR) scheduling, another signiﬁcant enhancement, ensures that lower-priority trafﬁc receives attention without comprising the priority settings administered by a network manager. These features allow network administrators to prioritize mission-critical, time-sensitive trafﬁc, such as voice (IP telephony trafﬁc), enterprise resource planning (Oracle, SAP, etc.), and computer-assisted design and manufacturing, over less time-sensitive applications such as FTP or e-mail (Simple Mail Transfer Protocol).

Network Availability

To provide efﬁcient use of resources for bandwidth-hungry applications 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-addressable memory (CAM) table entry.

Multicast VLAN Registration (MVR) is designed for applications using wide-scale deployment of multicast trafﬁc across an Ethernet ring-based service provider network (for example, the broadcast of multiple television channels over a service-provider network). 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-second convergence time. This is yet another enhancement of the Spanning Tree Protocol implementation. An

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additional feature that enhances performance is voice VLAN. This feature allows network administrators to assign voice trafﬁc to a VLAN dedicated to IP telephony, thereby simplifying phone installations and providing easier network trafﬁc administration and troubleshooting.

Network Management

Cisco Cluster Management Suite (CMS) is Web software that is embedded in Cisco Catalyst 3750, 3550, 2970, 2950, 2940, 3500 XL, 2900 XL, and 2900 LRE XL series switches. Through Cisco switch-clustering technology, users access Cisco CMS software with any standard Web browser to manage up to 16 of these switches at once, regardless of their geographic proximityæwith the option of using a single IP address for the entire cluster if desired. Cisco CMS software supports standards-based connectivity options such as Ethernet, Fast Ethernet, Fast EtherChannel, Gigabit Ethernet, and Gigabit EtherChannel connectivity. Because Cisco switch-clustering technology is not limited to a single stack of switches, Cisco CMS software expands the traditional cluster domain beyond a single wiring closet and saves time and effort for network administrators.

Cisco Catalyst 2950 Series switches can be conﬁgured either as command or member switches in a Cisco switch cluster. Cisco CMS also allows the network administrator to designate a standby or redundant command switch, which takes the commander duties should the primary command switch fail. Other key features include the ability to conﬁgure multiple ports and switches simultaneously, as well as perform software updates across the entire cluster at once, and clone conﬁgurations to other clustered switches for rapid network deployment. Bandwidth graphs and link reports provide useful diagnostic information, and the topology map gives network administrators a quick view of network status.

In addition to CMS, Cisco Catalyst 2950 Series switches provide extensive management tools using SNMP network management platforms such as CiscoWorks.

Cisco Catalyst 2950 Series switches deliver a comprehensive set of management tools to provide the required visibility and control in the network. Managed with CiscoWorks, Cisco Catalyst family switches can be conﬁgured and managed to deliver end-to-end device, VLAN, trafﬁc, and policy management. Coupled with CiscoWorks, Cisco Resource Manager Essentials, a Web-based management tool, offers automated inventory collection, software deployment, easy tracking of network changes, views into device availability, and quick isolation of error conditions.

Cisco Express Setup is a new feature that simpliﬁes initial conﬁguration of a switch. Users now have the option to set up the switch using a Web browser, eliminating the need for more complex terminal emulation programs and knowledge of CLI. Cisco Express Setup reduces the cost of deployment by enabling less-skilled personnel to set up switches quickly and simply.

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