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Cisco Systems Catalyst 2955 manual 10/100 Port Status LEDs, Color System Status

Models: Catalyst 2955

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Chapter 2 Overview

Front-Panel Description

In dual-power mode, the switch draws power from the power supply with the higher voltage. If the primary power supply fails in dual-power mode, the alternate power supply gives power to the switch.

The power status LEDs show whether the individual power supplies are receiving power and functioning properly.

Table 2-1lists the LED colors and meanings.

Note The power status LEDs show that power is not present on the switch if the power input drops below 17 V. The power status LEDs only show that power is present if the voltage at the switch input exceeds 18.5 V. The 1.5 V difference, or hysteresis, ensures that the power status LEDs do not oscillate at values near 18 V.

In dual-power mode, the power status LEDs show status for both power inputs, VA and VB.

Table 2-1

Power Status LEDs

 

 

Color

System Status

 

 

Off

System is not powered up.

 

 

Green

Power present on associated contact.

 

 

Red

Power not present on associated contact.

 

 

For information about the power LED colors during the power-on self-test (POST), see the “Powering On the Switch and Running POST” section on page 3-13.

10/100 Port Status LEDs

Each 10/100 port has a port status LED, also called a port LED, shown in Figure 2-7and Figure 2-8. These LEDs display information about the switch and the individual ports, shown in Table 2-2.

 

 

Catalyst 2955 Hardware Installation Guide

 

 

 

 

 

 

78-14944-03

 

 

2-13

 

 

 

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Cisco Systems Catalyst 2955 manual 10/100 Port Status LEDs, Color System Status
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Catalyst 2955 specifications

The Cisco Systems Catalyst 2955 is a robust and versatile Ethernet switch designed for enterprises seeking reliable Layer 2 switching capabilities. Known for its steadfast performance and extensive feature set, the Catalyst 2955 is particularly favored for environments requiring high-density connectivity and advanced traffic management.

One of the hallmark features of the Catalyst 2955 is its support for IEEE 802.1Q VLAN tagging, which allows for efficient traffic segregation and helps improve network security. The switch can handle up to 256 virtual LANs, supporting a more organized network structure and optimized resource allocation. This VLAN capability is crucial for businesses that need to segment their networks for various departments or applications while maintaining efficient communication between them.

The Catalyst 2955 is equipped with a comprehensive Quality of Service (QoS) mechanism, which prioritizes critical applications and ensures that voice, video, and data traffic receive appropriate bandwidth. By providing features such as classification, marking, queuing, and congestion avoidance, the switch helps meet the demands of real-time applications, thereby enhancing user experience and productivity.

Another remarkable technology integrated into the Catalyst 2955 is Spanning Tree Protocol (STP), which prevents loops in redundant network connections. Enhanced with features like Rapid Spanning Tree Protocol (RSTP), this switch minimizes downtime by allowing for quicker convergence times in case of topology changes. The ability to support both STP and RSTP is vital for maintaining network stability and performance.

The Catalyst 2955 is also designed with network management and monitoring in mind. It includes features like Simple Network Management Protocol (SNMP), which enables administrators to manage network resources effectively and troubleshoot issues more efficiently. With support for Cisco’s proprietary software, it offers insights into traffic patterns and usage statistics that can aid in maintaining optimal network health.

Physical characteristics of the Catalyst 2955 include various configurations with either 24 or 48 ports, suitable for different deployment scenarios. The switch is designed for rack mounting, making it an ideal solution for data centers and enterprise networks where space is a consideration.

In summary, the Cisco Systems Catalyst 2955 stands out for its solid Layer 2 functionality, VLAN support, QoS capabilities, network stability features such as STP, and extensive management tools, making it an excellent choice for organizations aiming to enhance network resiliency and performance. Its balance of performance and manageability continues to make it a viable option in the competitive landscape of networking equipment.