Cisco FlexStack Module provides a true stacking solution with all Catalyst 2960S Series switches in a FlexStack stack acting as a single switching unit when the module is installed in all switches. FlexStack provides a unified data plane, and single configuration for a group of stacked Cisco Catalyst 2960-S switches.
A single FlexStack connection between two members is a full duplex 10Gbps connecton. Each Cisco Catalyst 2960-S member supports two FlexStack connections. Each FlexStack member can simultaneously send and receive Ethernet traffic over both stack links at line rate, effectively giving 20Gbps of stack bandwidth per member. Up to four switches can stacked together using FlexStack to form a single logical switch.