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Force 10 - PVST on Force10 switch blocks untagged VLAN or puts port into err-disable when connected to Cisco or other third party switches

Summary: How to fix err-disable on connection between Force10 and Cisco or other vendor switches.

This article applies to This article does not apply to This article is not tied to any specific product. Not all product versions are identified in this article.
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Symptoms

When connecting a Force10 switch running PVST to a Cisco switch the Force10 blocks the untagged VLAN or puts the port into err-disable state. Force10 switches do not allow PVST+ BPDU (tagged or untagged) on an untagged port. If this occurs the switch places the port into an err-disable state or blocks the untagged VLAN.  This could possibly cause the network not to converge.

 

 

Resolution

To prevent this action on the switch you can use the no spanning-tree pvst err-disable cause invalid-pvst-bpdu command from the interface specific configuration mode. After this entry if the port receives a PVST+ BPDU on the untagged VLAN the BPDU is dropped and the port remains operational.

 

Affected Products

Force10 MXL Blade, Force10 S50-01-GE-48T-V, Force10 S50-01-GE-48T, PowerSwitch S4810P, PowerSwitch S5000, Force10 S50P, Force10 S55T, Force10 S60-44T, PowerSwitch S6000, Dell Networking Z9500
Article Properties
Article Number: 000140253
Article Type: Solution
Last Modified: 21 Feb 2021
Version:  3
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