Imagine a pair of switches connected with a couple of trunk links created in the following fashion:
Assuming the numbers on lines correspond to different VLANs, how would you arrange a working spanning tree configuration so that both of these links are active?
What I am trying to do is to separate certain VLANs over P20 link and the bulk of the remaining to be routed over P21 but so far, all I've been able to do get one of these two to work and the other one to be blocking. What's even worse, I can't clearly predict which one would be blocked.
The switches in question are a Dell 8024F and a Dell N3024 - the former doesn't support RPVST whereas the latter does, so it looks like I am stuck with Rapid Spanning Tree (RST). Is there any way to configure RST to allow routing on two trunks between two switches, or do I need to consider Multiple Spanning Tree (MST) protocol?
What is the way to best accomplish this setup? I would like to escape from complexity of the MST but if that is the only way, I would appreciate some hints/pointers on how to best set this up as I am not a network engineer and MST seems quite complex and finnicky.
P.S. I can share the full topology of my network (which I omitted for brevity) but, in a nutshell, there are a handful of switches arranged in a daisy-chain fashion (i.e. no loops/cycles between switches). Several of these would be having multiple trunks carrying different VLAN traffic.