I understand and also have read than frontplane stacking (such as VSX or VSF) is a kind of low cost backplane stacking solution (with stacking modules and stacking cables). The backplane stacking has higher throughput between switches and doesn't use up your ports for connectivity. If switches 8400 and 8320 are so powerful, why have they been designed for VSX instead of for backplane stacking?
Because lot of customers want to have core-aggregation switches
in 2 different telecom rooms. So backplane-stacking is not the right technology for such request.
Yes, I thought that could be the only reason. Is there another or just that?
Higher flexibility with VSX. You can use regular ports, no need for extra stacking module, start with 2 ports, can go up to 8. Port speed can be 10/25/40/100. And in case of VSX you have 2 control planes which large customers prefer for core boxes.
OK, much clearer! Many thanks!
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