Cisco Cisco IOS Software Release 12.2(35)SE

These sections describe the important notes related to this software release for the Catalyst 3750, 3560, 
2970, and 2960 switches and for the Cisco EtherSwitch service modules:

These notes apply to switch stacks:

Always power off a switch before adding or removing it from a switch stack. 

The Catalyst 3560 and 2970 switches do not support switch stacking. However, the show processes 
privileged EXEC command still lists stack-related processes. This occurs because these switches 
share common code with other switches that do support stacking.

Catalyst 3750 switches running Cisco IOS Release 12.2(25)SEB are compatible with Cisco 
EtherSwitch service modules running Cisco IOS Release 12.2(25)EZ. Catalyst 3750 switches and 
Cisco EtherSwitch service modules can be in the same switch stack. In this switch stack, the Catalyst 
3750 switch or the Cisco EtherSwitch service module can be the stack master.

These notes apply to Cisco IOS software:

The IEEE 802.1x feature in Cisco IOS Release 12.1(14)EA1 and later is not fully 
backward-compatible with the same feature in Cisco IOS Release 12.1(11)AX. If you are upgrading 
a Catalyst 3750 or a 2970 switch running Cisco IOS Release 12.1(11)AX that has IEEE 802.1x 
configured, you must re-enable IEEE 802.1x after the upgrade by using the dot1x 
system-auth-control global configuration command. This global command does not exist in Cisco 
IOS Release 12.1(11)AX. Failure to re-enable IEEE 802.1x weakens security because some hosts 
can then access the network without authentication.

The behavior of the no logging on global configuration command changed in Cisco IOS 
Release 12.2(18)SE and later. In Cisco IOS Release 12.1(19)EA and earlier, both of these command 
pairs disabled logging to the console:

the no logging on and then the no logging console global configuration commands

the logging on and then the no logging console global configuration commands

In Cisco IOS Release 12.2(18)SE and later, you can only use the logging on and then the no logging 
console global configuration commands to disable logging to the console. (CSCec71490)

In Cisco IOS Release 12.2(25)SEC for the Catalyst 3750, 3560, and 2970 switches and in Cisco IOS 
Release 12.2(25)SED for the Catalyst 2960 switch, the implementation for multiple spanning tree 
(MST) changed from the previous release. Multiple STP (MSTP) complies with the IEEE 802.1s 
standard. Previous MSTP implementations were based on a draft of the IEEE 802.1s standard.