Chapter 1 Product Overview

Front-Panel Description

Table 1-4 Port Mode LEDs (continued)

Mode LED

Port Mode

Description

 

 

 

SPEED

Port speed

The port operating speed: 10, 100, or 1000 Mbps.

 

 

 

LINE PWR2

Port inline power

The inline power status: on or off.

1.Not available on Catalyst 3550-24PWR switches

2.Available only on Catalyst 3550-24PWR switches

Table 1-5 Meaning of LED Colors in Different Modes

Port Mode

LED Color

Meaning

 

 

 

STATUS

Off

No link, or port was administratively shut down.

(port status)

 

 

Solid green

Link present.

 

 

 

 

 

Blinking green

Activity. Port is sending or receiving data.

 

 

 

 

Alternating

Link fault. Error frames can affect connectivity, and errors such as

 

green-amber

excessive collisions, CRC errors, and alignment and jabber errors

 

 

are monitored for a link-fault indication.

 

 

 

 

Solid amber

Port is blocked by Spanning Tree Protocol (STP) and is not

 

 

forwarding data.

 

 

Note After a port is reconfigured, the port LED can remain amber

 

 

for up to 30 seconds as STP checks the switch for possible

 

 

loops.

 

 

 

 

Blinking amber

Port is blocked by STP and is sending or receiving packets.

 

 

 

UTIL1

Green

Port LEDs display backplane utilization on a logarithmic scale. (See

(utilization)

 

Figure 1-4through Figure 1-8.)

 

 

 

 

Amber

Peak total backplane utilization over the last 24 hours.

 

 

 

DUPLX

Off

Port is operating in half duplex.

(duplex)

 

 

Green

Port is operating in full duplex.

 

 

 

 

SPEED

10/100 and 10/100/1000 ports

 

 

 

 

Off

Port is operating at 10 Mbps.

 

 

 

 

Green

Port is operating at 100 Mbps.

 

 

 

 

Blinking green

Port is operating at 1000 Mbps.

 

 

 

 

GBIC ports

 

 

 

 

 

Off

Port is not operating.

 

 

 

 

Blinking green

Port is operating at 1000 Mbps.

 

 

 

LINE PWR2

Off

Inline power is off.

 

Green

Inline power is on.

 

 

If the Cisco IP Phone is receiving power from an AC power source,

 

 

the port LED is off even if the IP phone is connected to the switch

 

 

port. The LED turns green only when the switch port is providing

 

 

power.

 

 

 

1.Not available on Catalyst 3550-24PWR switches

2.Available only on Catalyst 3550-24PWR switches

Catalyst 3550 Switch Hardware Installation Guide

1-8

OL-6155-01

 

 

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Image 26
Cisco Systems 3550 manual Line PWR, Port Mode LED Color Meaning

3550 specifications

Cisco Systems 3550 is a series of enterprise-class multilayer switches that have gained popularity in both enterprise and service provider networks. Introduced in the early 2000s, the 3550 series was designed to meet the increasing demand for advanced networking capabilities, including Layer 2 and Layer 3 switching, making it suitable for various network environments.

A standout feature of the Cisco 3550 is its support for advanced Layer 3 switching capabilities. This means it can perform routing functions similar to traditional routers while maintaining the speed and efficiency of a switch. The 3550 facilitates IP routing, enabling enhanced communication among different subnets without the need for additional routing devices.

The Cisco 3550 series is equipped with a range of ports, typically providing up to 48 Ethernet 10/100 ports and optional Gigabit Ethernet ports, ensuring scalability and flexibility in various network designs. The switches support Power over Ethernet (PoE), allowing the delivery of electrical power through Ethernet cables to connected devices, such as IP phones and wireless access points, streamlining installations and reducing cable management complexity.

Quality of Service (QoS) is another essential feature of the Cisco 3550. The switch supports advanced QoS mechanisms, which provide the ability to prioritize traffic. This is crucial in environments where bandwidth is limited, as it ensures that time-sensitive applications, like VoIP and video conferencing, receive sufficient bandwidth to function optimally.

In terms of security, the Cisco 3550 includes features such as access control lists (ACLs), port security, and VLANs (Virtual Local Area Networks). These features help in segmenting network traffic and preventing unauthorized access to sensitive information, thereby enhancing network security.

The Cisco 3550 is highly regarded for its robustness and reliability, making it a suitable choice for various organizations looking to maintain high availability in their networking environments. Its management capabilities include support for Cisco's IOS software, which offers a command-line interface for configuration, as well as options for SNMP and web-based management tools.

Overall, the Cisco Systems 3550 series is well-regarded for its multilayer switching capabilities, comprehensive feature set, and versatility in meeting the diverse needs of modern networking, making it a favored solution for businesses aiming to build efficient and secure network infrastructures.