Cisco GigaStack WS-X3500-XL - Manual (Page 30)

Chapter 1 Overview
Minimum IOS Release for Redundant Loop Configurations
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Catalyst GigaStack Gigabit Interface Converter Hardware Installation Guide
78-6460-04
Note All switches in a series must run the same software version. For example, if the
stack includes only Catalyst 2900 series XL and 3500 series XL switches, they
must run Release 12.0(5)XU or later. If the stack includes a mixture of Catalyst
2900 series XL, 3500 series XL, 2950, and 3550 switches, all the 2900 XL and
3500 XL switches must run Release 12.0(5)XW or later, all the Catalyst 2950
switches must run Release 12.1(6)EA2 or later, and all the Catalyst 3550 switches
must run Release 12.1(4)EA1 or later.
For more information, see the “Cascaded Stack Connections with a Redundant
Link” section on page 2-12 . For switch software upgrade information, refer to the
release notes for your switch.
Table 1-5 Minimum IOS Release for Redundant Loop Configurations
Supported Switch Minimum IOS Release
Modular 2900 XL switches 12.0(5)XU (April 2000)
2950 switches 12.1(6)EA2 (December 2000)
3500 XL switches 12.0(5)XU (April 2000)
3550 multilayer switches 12.1(4)EA1 (May 2001)