Looking at the data sheet stacking seems to be only available in the S series:
What's new for the Cisco Catalyst 2960-S Series Switches with LAN Base Software:
• 10 and 1 Gigabit Ethernet uplink flexibility with Small Form-Factor Pluggable Plus (SFP+), providing business continuity and fast transition to 10 Gigabit Ethernet
• 24 or 48 ports of Gigabit Ethernet desktop connectivity
• Cisco FlexStack stacking module with 20 Gbps of throughput, allowing ease of operation with single configuration and simplified switch upgrade
Thanks Reza. I was hoping that this was just an add-on module, but I had seen it in there as well. I'm assuming that there's no way of stacking the standard 2960 and see it as a single entity without this module.
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If you just want to manage multiple 2960s as a single entity, you might check whether they support clustering.
True stacking offers other advantages other than single entity management.
Only the "S" are stackable.
There's a very, very crude way of "stacking" switches is this is using Switch Clustering. Honestly, I don't see any real benefit of using Switch Clustering in modern times. I mean, it was OK during early 2000 but with the advent of Stacking, Clustering has really no place nowadays.