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Stacked devices operate in a Ring or chain topology. The Ring topology connects all stacked devices in a circle. Each stacked device accepts data and sends it to the device to which it is physically connected. The packet continues through the stack until it reaches the destination port. The system automatically discovers the optimal path by which to send traffic. A chain topology connects stacking members from one to the next. This provides a single data path flow. The stacking members linked in the middle of the chain are connection to the stacking member on either side of them. The members on the ends of the chain only have one connection. Stacking Ring Topology

One of the benefits of the Ring topology is that it offers redundancy in case the connections between two units fail, including the case where a unit in the stack fails. If a failure occurs in the stacking topology, the stack reverts to Chain Stacking Topology. In the Chain topology, devices operate in a chain formation. The system automatically switches to a Stacking Failover topology without any system downtime. An SNMP message is automatically generated, but no stack management action is required. However, the stacking link or stacking member must be repaired to return to the Ring topology.

After the stacking issues are resolved, the device can be reconnected to the stack without interruption and the Ring topology is restored.

引用 : http://documentation.netgear.com/gs700ts/enu/202-10228-02/GS700TS_UM-05-09.html