Spanning Tree – MST (802.1s)
It should be obvious by now that there are really two types of spanning-tree topologies. One where all switches run a single spanning-tree instance (common spanning-tree) and one where a… Read more »
Spanning Tree – RSTP (802.1w)
802.1d has some downsides to it. Namely, it was slow to converge to a new topology taking anywhere from 30 to 50 seconds to do so. The main aim of… Read more »
Cisco debug messages…
I was doing a RSTP lab testing when I saw this debug message show up on a switch… *Mar 1 00:37:36.929: RSTP(1): we become the root bridge Now that’s awesome. … Read more »
Spanning Tree – 802.1d timers and misc.
I haven’t talked about it much yet, but the actual STP convergence time is fairly slow. This is because of the amount of time that STP spends transitioning ports from… Read more »
Spanning Tree – Reconvergence
So once spanning-tree has done its initial build, we need to talk about what happens when the topology changes. This happens any time that a port goes forwarding or goes… Read more »
Spanning Tree – 802.1d (Normal)
Let’s start with the basics. When I started learning about spanning-tree, I found it INCREDIBLY hard to get a good footing on the different protocols. You’d read about 802.1d, 802.1w,… Read more »