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

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PVST+ in Multi-Vendor Networks

Some non-Dell Networking systems which have hybrid ports participating in PVST+ transmit two kinds of BPDUs: an 802.1D BPDU and an untagged PVST+ BPDU.

Dell Networking systems do not expect PVST+ BPDU (tagged or untagged) on an untagged port. If this situation occurs, the Dell Networking OS places the port in an Error-Disable state. This behavior might result in the network not converging. To prevent the system from executing this action, use the no spanning-tree pvst err-disable cause invalid-pvst-bpdu command. After you configure this command, if the port receives a PVST+ BPDU, the BPDU is dropped and the port remains operational.

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