CCIE: 802.1s (MST)
Overview: MSTP, which uses RSTP for rapid convergence, enables VLANs to be grouped into a spanning-tree instance, with each instance having a spanning-tree topology independent of other spanning-tree instances. This architecture provides multiple forwarding paths for data traffic, enables load balancing, and reduces the number of spanning-tree instances required to support a large number of VLANs. All the details can be found here. My personal field experience: It’s funny, I always hear how great MST is (and it does have…