The Cisco Catalyst 3550 switch has been introduced to replace the aging Catalyst 3500XL Layer 2 switch that previously was part of Cisco抯 answer to the access layer switch market. The Catalyst 3550 and 2950 switches have replaced the Catalyst 3500 XL switches. The end-of-sale for the Catalyst 3512 XL, 3524 XL, and 3548 XL was July 27, 2002. This end-of-sale announcement does not include the Catalyst 3524-PWR XL and the 3508G XL.
The 3500XL switch is part of the Catalyst 揦L?family, which includes the 2900XL, 2900XL LRE, and the 3500XL. Something new to Cisco抯 lower end switches was that they ran a complete version of IOS. An interesting note is that Cisco, in an effort to standardize the IOS over their entire product line, created a switch that ran router software. The XL series switches had quite a number of commands that were 搇eft-over?router commands. For example, you could type 搃p address 192.168.1.1 255.255.255.0?on interface FastEthernet 0/1 and the switch would take the command and also display this under the running-configuration. The XL series switches are strictly Layer 2 devices, meaning they had no layer 3 capability outside of the management interface (Telnet, SNMP, etc). This means that your recently entered IP address is useless; however the switch did take the command without error. This was one of the many frustrating 揻eatures?of the XL series switches. The IOS was not completely custom-fit for the devices, therefore leaving behind a myriad of unusable commands.
Engineers that were new to the Cisco world appreciated the fact that these devices ran the IOS that was like the software that ran on the routers. Older Engineers that were extremely familiar with Cisco抯 other LAN switching products, such as the Catalyst 5000 platform, were unimpressed with the devices operating system and command structure.
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