It is recommended, but not required, that PowerEdge MX switches are connected to a pair of redundant upstream switches. When you are connecting a pair of switches in Fabric mode to an upstream switch pair, ensure that:
Both upstream switches must be connected to each other using technologies such as VLT or VPC.
The upstream switch ports must be in a port channel using LACP.
NOTE: The LACP option is supported on Ethernet uplinks only.
A compatible Spanning Tree Protocol is configured. For more information, see the section,
Spanning Tree Protocol.
Spanning Tree Protocol
OpenManage Modular v1.20.00 and OS10 versions later than 10.5.0.5 include a new Ethernet uplink type that does not require STP. The No STP Ethernet uplink is now the recommended uplink type for all SmartFabric installations. See the
Dell PowerEdge MX Networking Deployment Guide for upstream switch configuration instructions.
The legacy Ethernet uplink type that does require STP is still supported. If you are creating a legacy Ethernet uplink, ensure that the correct STP type is selected.
OS10 defaults to RPVST+ as the Spanning Tree protocol. To change STP modes, use the spanning-tree mode command. Use the spanning-tree mode command to change STP modes. For steps, see the
OS10 Enterprise Edition User Guide.
NOTE: During MX deployment, if the Spanning Tree is enabled, assign the Top of Rack (ToR) switch as root bridge to avoid traffic drop during convergence.
NOTE: If the upstream network is running RSTP, change from RPVST+ to RSTP before physically connecting the switches to the upstream network. Failure to do so may cause a network outage.
For more information about SmartFabric uplinks, see the
PowerEdge MX SmartFabric Configuration and Troubleshooting Guide.
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