The Catalyst 3550 switch is a stackable multi-layer series of switches that provides high availability, QoS and security to enhance network ops. Buy/Sell Cisco 3550 Equipment: Vibrant buys and sells new and used Cisco 3550 Series Switches at deep discounts off of Cisco's list price. 

If you have questions about which 3550 switch model to choose, or have bulk/special pricing requests, please Request a Quote or call our networking team at 888-443-8606. If you have switches for sale and want us to make an offer “ we're always buying Cisco 3550s and any networking equipment for stock. Contact us to sell your Catalyst 3550 switches today.

Cisco 3550 Switch Overview: As a stackable multilayer switch, the Cisco 3550 Switch series offers a good QoS (Quality of Service), high availability and greater security for higher network operations. It also features a whole host of Gigabit and Fast Ethernet configurations making it a perfect option for metro access and enterprise applications. As always, it comes with plenty of industry leading intelligent services and the Cisco Network Assistant to administer the switches.

What Makes The 3550 a top Cisco switch?

Considered as an enterprise class of switches, the Cisco 3550 is a series of multilayer and stackable switches with intelligent Ethernet capabilities that enhances operation of the network using QoS, high availability and ease of access to administrators. Not only is it a power access layer switch for medium sized enterprise level wiring closets but also can form the backbone for small networks. What does make the 3550 series famous is its industry leading intelligenet services such as high performance IP routing, traditional LAN switching simplicity, QoS rate limiting, multicast management and Cisco security access control lists. Moreover, with the Cisco Network Assistant's GUI interface, it is easy to troubleshoot, configure and monitor the network while managing a whole host of administrative tasks with wireless access points, routers and switches.

Overall Review

The foremost feature of the Catalyst 3550 switch series is the CMS or Cisco Cluster Management software that lets you handle multiple Catalyst desktop switches at once using a web browser interface. Now with new configuration wizards, it is easier to implement intelligent services and create a converged network. Take for example, the 3500-24 PWR switch that helps drastically reduce cost of ownership when incorporating Cisco IP phones or even the Aironet wireless LAN Cisco access points. By delivering a decent 15 Watts of inline power integrated on each and every 10/100/1000 port, it eliminates the need to find access to wall power for any WLAN or IP Phone. Moreover, the cost of laying down new cables also comes down as you really don't need cables to now power such deployments. By combining the 3550 switches with Cisco Redundant Power System 675, you can ensure against power failures and protect against loss of power using a UPS system. The Cisco Catalyst 3550 Series of Intelligent Ethernet Switches come in the following setups. WS-C3550-

  • 3550-24 Switch- 24 x 10/100 ports and 2 x GBIC based Gigabit Ethernet ports; 1 x rack unit
  • 3550-24 PWR Switch- 24 x 10/100 ports, integrated inline power, 2 x Gigabit Ethernet ports (GBIC-based) and 1 x RU
  • 3550-24-DC Switch- 24 x 10/100 ports, 2x GBIC-based ports, 1 x RU and DC-powered
  • 3550-24-FX Switch- 24 x 100FX ports, 2 x GBIC-based Gigabit Ethernet ports and 1 x RU
  • 3550-48 Switch- 48 x 10/100 ports, 2 x GBIC-based ports and 1 x RU
  • 3550-12G Switch- 10 x GBIC-based ports, 2 x 10/100/1000BASE-T ports and 1.5 x RU
  • 3550-12T Switch- 10 x 10/100/1000BASE-T ports, 2 x GBIC-based ports and 1.5 x RU

The following models incorporate a large range of GBIC transceivers “ the 1000BASE-T, 1000BASE-LX/LH, CWDM GBICS, 1000BASE-ZX, 1000BASE-SX. With such a dual Gigabit Ethernet setup using Fast Ethernet configurations, customers can manage to deploy tremendous flexibility and implement uplink and stacking configuration immediately while retaining the ability to later on migrate the same exact configuration to any another location or system. Similarly, the Catalyst 3550 switches offer dual redundant GBIC uplinks with a loopback cable, CrossStack, Uplink Fast technologies that helps in retaining higher levels of stack resiliency. Now never face stack interconnection failure and always retain the high speed uplink on a second-by-second basis. It also offers PVST+ for uplink load balancing. With the Gigabit Ethernet flexibility, the 3550 Catalyst series becomes the perfect LAN edge partner to the 6500 family of Catalyst Gigabit Ethernet LAN core optimized switches. A point to note, the SMI or Standard Multilayer Softare Image is available with only the Catalyst 3550-24, 3550-24-FX, 3550-48, 3550-24-DC and 3550-24-PWR. On the other hand Enhanced Multilayer Image or EMI is available with all the models in the 3550 switch series. The difference between the two lies in the capabilities. While SMI offers rate limiting, QoS, ACLs, routed information protocol functionality and basic static, EMI provides a vastly superior range of enterprise level features such as multicast, advanced hardware IP unicast, WCCP or Web Cache Communication Protocol and more. With the above mentioned switches one can upgrade to the EMI using the EMI upgrade kit. However, the 3550-12G and 3550-12T models both come with EMI built into it. 

Cisco 3550 Switch Prices:

- Interested in saving on a Cisco 3550 Series Switch? Vibrant has quality, tested and guaranteed used Catalyst 3550 Switches for sale and in stock at a great value. Depending on market conditions and stock levels, prices can swing (from great values to amazing deals) “ but we'll make sure you'll get an incredible value from Vibrant, an independent, industry leading reseller, making enterprise network equipment affordable since 1998.

Request a quote today for current pricing and availability, or call our Cisco team at 952-653-1700.

Cisco 3550 GUI and/or Web interface: (Cisco Network Assistant Quick Tips; images included) (Image link from Cisco) Cisco's Network Assistant software allows users to configure and manage a variety of switch functions and start the device manager of Cisco routers and Cisco wireless access points. This application is available for OS X and Windows, optimized for wired and wireless LANs for expanding businesses that have 40 or fewer switches and routers. See for more information.

Cisco 3550 Manuals and User Guides: 1. Cisco Catalyst 3550 Switch Getting Started Guide: 2. Cisco Catalyst 3550 Switch Software Configuration Guide (PDF format): 3. Cisco Catalyst 3550 Hardware Installation Guide (PDF format): 4. Cisco Catalyst 3550 Multilayer Switch Command Reference

Cisco 3550 Emulators: 1. TechRepublic post on free emulator; also explains difference between stimulators and emulators: 2. Dynamips (software that emulates Cisco IOS on a traditional PC): 3. GNS3 (open source software that simulate complex networks): 4. Cisco Learning Lab for SWITCH; note fees are involved: 5. WebNMS Simulation for Cisco IOS:

Can you help with the following defaults for a 3550? * Default username: * Default password: * Default IP Address: For default username/password, a member on the Cisco Support Community reports: This is no default username/password included in a switch. You will need to enter the following command. username <username> password <password> Obviously remove the <> in username and password. If you don't set this, the only other way you can connect is via telnet, console, and or ssh. Under line vty you need to enter 'login' and then 'password <password>' with the specific password. The following table details default switch information for the Cisco Catalyst 3550:

Feature Default Setting
IP address and subnet mask No IP address or subnet mask are defined.
Default gateway No default gateway is defined.
Enable secret password No password is defined.
Host name The factory-assigned default host name is Switch.
Telnet password No password is defined.
Cluster command switch functionality Disabled.
Cluster name No cluster name is defined.

For default IP Address, No IP address or subnet mask are defined as a default setting for Cisco Catalyst 3550 switches. See for more information.

Password Recovery Instructions: (Password Recovery, Cisco Catalyst Fixed Configuration Layer 2 and Layer 3 Switches): Also see the Cisco page entitled Password Recovery Procedures, which Cisco explains is an index of password recovery procedures for Cisco products including various switch models. When following any password recovery procedure, Cisco notes that physical access to the equipment is required for security purposes.

How to do a factory reset of a Cisco 3550: To reset the Cisco Catalyst 3550 to factory defaults, see the Cisco document entitled Resetting Catalyst Switches to Factory Defaults at

What is the Boot System Command for a Cisco 3550? If you use a CMS image on the 3550, the Cisco IOS image (.bin file) extraction creates a directory for the image alone. The boot system command becomes boot system flash: directory/file_name. See the Cisco page for Upgrading Software Images on Catalyst 3550 Series Switches Using Command Line Interface at:

How would you do a Break Sequence for a Cisco 3550? What break sequence to use depends upon the terminal application and operating system you are using. HyperTerminal that runs on Windows 2000 uses Ctrl-Break. See Cisco's page on Recovering Catalyst Fixed Configuration Switches from a Corrupted or Missing Image at for more information.

How to erase a config on a Cisco 3550? See the Cisco page called Resetting Catalyst Switches to Factory Defaults at Cisco notes that you will need access to the switch console through either a physical console or a Telnet connection and will also need the console/enable passwords. If you have forgotten the console and enable password of the switch, you cannot reset the configuration to factory default to reset the password. In this situation, follow password recovery procedures for your switch.

How to set the time zone on a Cisco 3550? Beginning in privileged EXEC mode, follow these steps to manually configure the time zone:

Command Purpose
Step 1 configure terminal Enter global configuration mode.
Step 2 clock timezone zone hours-offset [minutes-offset] Set the time zone.The switch keeps internal time in universal time coordinated (UTC), so this command is used only for display purposes and when the time is manually set.For zone, enter the name of the time zone to be displayed when standard time is in effect. The default is UTC.For hours-offset, enter the hours offset from UTC. (Optional) For minutes-offset, enter the minutes offset from UTC.
Step 3 end Return to privileged EXEC mode.
Step 4 show running-config Verify your entries.
Step 5 copy running-config startup-config (Optional) Save your entries in the configuration file.

The minutes-offset variable in the clock timezone global configuration command is available for those cases where a local time zone is a percentage of an hour different from UTC To set the time to UTC, use the no clock timezone global configuration command. 

How do you execute a boot system command on a 3550? See Cisco's page entitled Catalyst 3550 Switch Bootloader Commands at If you use a CMS image on the 3550, the Cisco IOS image (.bin file) extraction creates a directory for the image alone. The boot system command becomes boot system flash: directory/file_name.

What are some other common commands for a Cisco 3550? Common Commands for the Cisco Catalyst 3550 Switches: show version : Display the Cisco 3550 Hardware and Software status: show flash : Displays all the files and directories contained within the flash of your 3550 show-mac-address-table : To get the MAC address of external hardware connected to one of the ports on your 3550 switch show interfaces : Provide all relevant information related to your 3550 interfaces ip address : configure the IP address of specific interfaces show running-config : Brings up the status of the RAM show startup config : Displays status of the NVRAM show history : View the last 10 commands performed on your 375 Additional commands for the Cisco 3550:

Cisco 3550 Visio Stencil: See the Cisco Visio Stencils page at You will need Microsoft Vision Standard or Professional in order to view and use these stencils correctly.

Contact Options Contact our Cisco networking team directly at or 888-443-8606 with any questions. For more information on new, refurbished or used Cisco 3550 Series Switches - to buy or sell, please contact Cisco sales at or call 1.888.443.8606 and ask for our Cisco team.