(The double star structure is a double core star network topology, which summarizes the benefits of the single star structure and the mesh structure, which not only saves the link, but also plays the role of routing redundancy and backup of the mesh structure. The dual-star structure network is usually divided into three layers: the core layer, the aggregation layer and the access layer. The core layer adopts the dual-core mode of master and backup, and each aggregation layer device is connected to two core devices respectively. The cost-effectiveness of the double star structure is high, so the
Routing Backup.pdf
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