I have a situation whereby in a predominantly HP network (comware) I have a handful of Cisco switches. All running MST. The Root for all VLANs is a L3 HP Core chassis switch. Everythign is fine until you plug a new Cisco switch into the network configured with the default PVST. All the Cisco switches running MST shutdown their up-link to the Core with an error
SPANTREE-2-PVSTSIM_FAIL: Blocking root port Po1: Inconsistent Inferior PVST BPDU received on VLAN 4, claiming to be root 32772:mac address.
It is is an inferior BPDU why is the Cisco switch shutting down the port. I need to remove PVSTSIM I think?
PVST simulation is run on boundary ports and works in two ways:
If the MST region has the root bridge for CIST, PVST simulation is required in order to replicate instance 0 information, and create one BPDU for every VLAN that is allowed across the trunk and tag it with the appropriate VLAN information.
If the root bridge for CIST is outside of the MST region, then PVST simulation is required to process VLAN 1 information only. The other BPDUs (VLANs 2 and above) are used for consistency checks and information from these VLANs is never copied as root bridge information.
For PVST simulation to work without failures, these two conditions must be met:
If the root bridge for CIST is within a non-MST region, the spanning-tree priority of VLANs 2 and above within that domain must be better (lesser) than that of VLAN 1.
If the root bridge for CIST is within a MST region, VLANs 2 and above defined in the non-MST domains must have their spanning-tree priorities worse (greater) than that of the CIST root.
If these conditions are not met, the boundary port is put into a PVST simulation inconsistent state until the problem is corrected.
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