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Q. What are the FlexStack-Plus high-availability features?
A. The following features enhance high availability and manageability across a stack:
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Cross-stack EtherChannel
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SPAN
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FlexLink technology
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Hitless voice calls
Investment Protection
Q. Is FlexStack-Plus stacking backward compatible with FlexStack?
A. Yes. Unlike competing products, the FlexStack-Plus stacking is backward compatible with FlexStack to
preserve customer investment. This allows mixed stacking of Cisco Catalyst 2960-S and Cisco Catalyst 2960-
SF LAN Base series with 2960-X LAN Base series for investment protection.
Q. What is a mixed stack?
A. The stack is called a mixed stack if it has both the Cisco Catalyst 2960-S Series Switch and Cisco Catalyst
2960-X Series Switches. The mixed stack features are limited to Cisco Catalyst 2960-S Series features.
(See Table 4.)
Table 4. FlexStack Combinations
Stack Combination Max Stack Bandwidth Stack Limit IOS License
2960-XR 80G 8 IP Lite
2960-X 80G 8 LAN Base
2960-S/SF 40G 4 LAN Base
Mixed Stack: 2960-X and 2960-S/SF 40G 4 LAN Base
Q. Does mix stack require any configuration on Cisco Catalyst 2960-X switches?
A. Yes. The switch stack speed should be set to 40 using configure mode command “switch stack-speed 40” on
Cisco Catalyst 2960-X switches to stack with Cisco Catalyst 2960-S switches. While forming a homogenous
stack of Cisco Catalyst 2960-X revert back the stack speed to 80 using “no switch stack-speed 40”.
Q. Can Cisco Catalyst 2960-X switches and 2960-XR switches stack together?
A. No. Cisco Catalyst 2960-X and 2960-XR switches can’t be stacked together, even though they belong to the
same 2960-X series they do not share same IOS License models.
Q. What are the possible mixed-stack combinations?
A. The LAN Base models can only form mixed stacks. The possible mixed-stack combinations are listed in
Table 5.
Table 5. Possible Mixed-Stack Combinations
Mixed-Stack Combination 2960-XR
IP Lite
2960-X
LAN Base
2960-S/SF LAN Base
2960-XR IP Lite Yes No No
2960-X LAN Base No Yes Yes
2960-S/SF LAN Base No Yes Yes