Dell PowerConnect 8100 CLI Reference Guide - Page 874
Port Roles, Manual, Auto-Upstream
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Port Roles Each port's behavior is dependent on the operational mode of that port and of other ports in the stack. The port mode is a DCBX configuration item that is passed to the DCBX clients to control the processing of their configuration information. There are four port roles: 1 Manual 2 Auto-Upstream 3 Auto-Downstream 4 Configuration Source Manual Ports operating in the Manual role do not have their configuration affected by peer devices or by internal propagation of configuration. These ports have their operational mode and TC and bandwidth information specified explicitly by the operator. These ports will advertise their configuration to their peer if DCBX is enabled on that port. Incompatible peer configurations will be logged and counted with an error counter. The default operating mode for each port is Manual for PowerConnect releases; however, customer platforms may change the default mode for selected ports to either Auto-Upstream or Auto-Downstream mode. An example of this would be a blade switch that needed to support touchless configuration and has certain ports that are upstream ports and other ports that are downstream ports. A port that is set to manual mode sets the willing bit for DCBX client TLVs to false. Manually configured ports never internally propagate or accept internal or external configuration from other ports. Manually configured ports may notify the operator of incompatible configurations if client configuration exchange over DCBX is enabled. Manually configured ports are always operationally enabled for DCBX clients, regardless of whether DCBX is enabled. Auto-Upstream Advertises a configuration, but is also willing to accept a configuration from the link-partner and propagate it internally to the auto-downstream ports as well as receive configuration propagated internally by other auto-upstream ports. The local configuration parameters for PFC and ETS, if any, are 874 Data Center Bridging Commands
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