ā05-13-2010 08:51 AM - edited ā03-06-2019 11:04 AM
I saw some previous topics regarding MSTP and PVSTP interaction but I still have some uncertainties.
Also I've read the "understanding MSTP article" from cisco's website.
my setup i:
c1 -----c2
c1 needs to be root for vlan 1-20
c2 root for rest of the vlans
c1 pvst
c2 mst
trunk conf
switchport trunk enca dot1q
sw mode trunk
sw trunk allowed vlan 1,3,6
c2 mst config
instance 0 vlan 1,3,6
instance 1 vlan all except above
and when i enable the trunk i got error and link goes to blocking mode
%SPANTREE-2-PVSTSIM_FAIL: Blocking root port Gi0/24: Inconsitent inferior PVST BPDU received on VLAN 4, claiming root 24580:0022.55bb.1500
anything i am missing in my config ?
I understand that mst needs to be root bridge for all the rstp vlans but is there any alternative way around it ?
ā09-02-2014 04:50 AM
Did you ever get a resolution for this?
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?
ā09-02-2014 09:15 AM
PVST simulation is run on boundary ports and works in two ways:
For PVST simulation to work without failures, these two conditions must be met:
If these conditions are not met, the boundary port is put into a PVST simulation inconsistent state until the problem is corrected.
Regards
Inayath
Find answers to your questions by entering keywords or phrases in the Search bar above. New here? Use these resources to familiarize yourself with the community: