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Dell PowerEdge FN I/O Module Configuration Guide 9.10(0.0)

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Preventing Forwarding Loops in a VLT Domain

During the bootup of VLT peer switches, a forwarding loop may occur until the VLT configurations are applied on each switch and the primary/secondary roles are determined.

To prevent the interfaces in the VLT interconnect trunk and RSTP-enabled VLT ports from entering a Forwarding state and creating a traffic loop in a VLT domain, take the following steps.
  1. Configure RSTP in the core network and on each peer switch as described in Rapid Spanning Tree Protocol (RSTP). Disabling RSTP on one VLT peer may result in a VLT domain failure.
  2. Enable RSTP on each peer switch. PROTOCOL SPANNING TREE RSTP mode no disable
  3. Configure each peer switch with a unique bridge priority. PROTOCOL SPANNING TREE RSTP mode bridge-priority

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