Knowledge Base

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

When connecting a Force10 switch running PVST to a Cisco switch the Force10 blocks the untagged VLAN or puts the port into errdisable 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.

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.

Article ID: SLN248779

Last Date Modified: 03/30/2017 02:42 PM

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