VPEX Architecture shows the VPEX switching architecture, based on the IEEE 802.1BR specification, comprising one or two controlling bridges (CBs), and one or more bridge port extenders (BPEs) (see Bridge Port Extenders Description). In this document, BPEs are V400 Virtual Port Extenders, and CBs are ExtremeXOS switches.
In this architecture, ports on the CB or BPEs connecting to BPEs are termed cascade ports, while corresponding ports on BPEs connecting them to the CB or upstream BPEs are termed upstream ports. Ports from the BPEs connected to the rest of the network are termed extended ports.
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