I heve a redundant C4500 Core which is connected to Dell PowerConnect5324 Switches. The Dell Switches does support Common Spanning Tree (CST) but not per VLAN STP.
My Problem is now, that I cannot find out how to configure CST on the Cat4500 Switches (IOS Based). Only PVST can be configured. I also tried it using MST with a single Instance, but the Spanning tree was not stable.
What is the Best Practice to connect Switches which supports CST only?
In Cisco's PVST, vlan 1 is the CST. That's where you can configure STP parameters that will interact with the third party bridges. The STP instances running on the other vlans (on the Cisco bridge) use a proprietary BPDU format. These BPDUs are flooded through the third party bridges (these bridges just look like a wire for the Cisco bridge).
The most simple way to have a Cisco bridge running a unique STP instance in the pure IEEE fashion is to run MST (don't create any instance, just use the mst mode). If this is what you were doing, could you be more specific about the instability you had?
PVST is the mode to use with devices which runs CST only (as Francois explained in detail)
And MST using on Instance gives you an unic STP (also as explained from Francois)
The Instability i had was following:
I had a dublicated Address in my Network, so the Switch debugs told me that a specific Address is seen on different Ports (swapping). I assumed that there is a loop im my Spanning tree, but it wasn't, it was just a Problem with a wrong configured host and my interpretation was wrong.
So I couldn't find any stable STP solution, because the Problem was a different one..
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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