Cisco Catalyst 2950 Software Guide

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Catalyst 2950 Desktop Switch Software Configuration Guide
78-11380-03
Chapter 1 Overview
Features
Redundancy
• HSRP for command switch redundancy
• UniDirectional link detection (UDLD) on all Ethernet ports for detecting and disabling unidirectional links on
fiber-optic interfaces caused by incorrect fiber-optic wiring or port faults
• IEEE 802.1d Spanning Tree Protocol (STP) for redundant backbone connections and loop-free networks. STP has these
features
– Per-VLAN Spanning Tree (PVST) for balancing load across virtual LANs (VLANs)
– Port Fast mode for eliminating forward delay by enabling a port to immediately change from a blocking state to a
forwarding state
– UplinkFast, cross-stack UplinkFast, and BackboneFast for fast convergence after a spanning-tree topology change
and for achieving load balancing between redundant uplinks, including Gigabit uplinks and cross-stack Gigabit
uplinks
– STP root guard for preventing switches outside the network core from becoming the STP root
Note A Catalyst 2950 switch can support up to 64 spanning-tree instances (see Table 8-1 on page 8-2).
VLAN Support
• Catalyst 2950 switches support 250 port-based VLANs for assigning users to VLANs associated with appropriate
network resources, traffic patterns, and bandwidth.
Note The Catalyst 2950-12 and Catalyst 2950-24 switches support only 64 port-based VLANs.
• IEEE 802.1Q trunking protocol on all ports for network moves, adds, and changes; management and control of
broadcast and multicast traffic; and network security by establishing VLAN groups for high-security users and network
resources
• VLAN Membership Policy Server (VMPS) for dynamic VLAN membership
• VLAN Trunking Protocol (VTP) pruning for reducing network traffic by restricting flooded traffic to links destined for
stations receiving the traffic
• Dynamic Trunking Protocol (DTP) for negotiating trunking on a link between two devices and for negotiating the type
of trunking encapsulation (802.1Q) to be used
Table 1-1 Features (continued)

Cisco Catalyst 2950 Specifications

General

Forwarding Bandwidth	8.8 Gbps
Switching Capacity	13.6 Gbps
Forwarding Rate	6.6 Mpps
Weight	3.6 kg
RAM	16 MB
Flash Memory	8 MB
Operating Humidity	10% to 85% non-condensing
Uplink Ports	2 x 10/100/1000Base-T
Dimensions	4.4 cm x 44.5 cm x 24.2 cm
Remote Management Protocol	SNMP, Telnet, HTTP
Features	Quality of Service (QoS), VLAN support
Compliant Standards	IEEE 802.3, IEEE 802.3u, IEEE 802.1D, IEEE 802.1Q, IEEE 802.1p
Status Indicators	system
Operating Temperature	0 to 45°C
Ports	24 x 10/100 Ethernet ports
MAC Address Table Size	8, 192 entries
Power Supply	Internal 100-240V AC, 50-60Hz