Number of stacking cables for aggregation switch

The number of stacking cables depends on the stack topology: a chain requires one cable between each pair of switches, while a ring requires one cable per connection including a final cable connecting the last switch to the first.Stacking TopologiesChain Topology: Each switch is connected to its neighbor with a single stacking cable. For a stack of n switches, you need n-1 cables. This is simpler but does not provide redundancy if a cable fails .Ring Topology: Each switch is connected to its neighbor, and the last switch is connected back to the first, forming a loop. For n switches, you need n cables. This topology provides redundancy and higher reliability .Cable Types and ConsiderationsStacking cables are specific to the switch model and port type. For example, Extreme Networks switches use dedicated stacking cables available in lengths from 0.5 to 100 meters .Cisco SG350X switches can use either SFP+ cables for longer runs or conventional Ethernet cables for short distances, with similar performance at short ranges .Using non-recommended cables can cause stack instability, so it is important to use manufacturer-approved cables .Aggregation and Stacking InteractionIn aggregation switches, stacking cables allow multiple switches to operate as a single logical unit, simplifying management and increasing port density .For uplinks or high-throughput connections, stacking can be combined with link aggregation (LAG or M-LAG) to expand bandwidth and provide redundancy .The physical number of stacking cables does not directly correlate with the number of aggregated links; aggregation uses standard Ethernet or SFP+ ports, while stacking uses dedicated stack ports .Practical ExampleFor a 4-switch stack:Chain topology: 3 stacking cablesRing topology: 4 stacking cablesEach cable connects the stacking ports of adjacent switches, and in a ring, the last cable closes the loop for redundancy . In summary, determine your stack topology first. Use one cable per connection in a chain, and one per connection including the loop in a ring. Always use manufacturer-approved stacking cables to ensure stability and performance.