学员提问：
cisco官方文档有没有关于cisco 3750交换机,ios版本不一致,不可堆叠,或者不建议堆叠的文档吗. 如果有请发个链接.谢谢
捷盈讲师及学员解答：
The Catalyst 3750 IP services image cryptographic image has a higher
priority than the Catalyst 3750 IP base image during the master switch
election in a stack. However, when two or more switches in the stack
use different software images, such as the IP base image for Cisco IOS
Release 12.1(11)AX and the cryptographic IP services image for Cisco
IOS Release 12.1(19)EA1 or later, the switch running the IP base image
is selected as the stack master. This occurs because the switch running
the cryptographic IP services image takes 10 seconds longer to start
than does the switch running the IP base image. The switch running the
IP services image is excluded from the master election process that
lasts 10 seconds. To avoid this problem, upgrade the switch running the
IP base image to a software release later than Cisco IOS Release
12.1(11)AX or manually start the master switch and wait at least 8
seconds before starting the new member switch.
http://www.cisco.com/en/US/docs/switches/lan/catalyst3750/software/release/12.2_40_se/configuration/guide/swstack.html#wp1178943