Spanning Tree Protocol-MST | Simple Method to Configure _MST Protocol |Fast Method to configure

Spanning Tree Protocol-MST | Simple Method to Configure _MST Protocol |Fast Method to configure.

The default spanning tree mode on Cisco Catalyst switches is PVST+ or, on newer models, Rapid PVST+. These protocols result in a direct one-to-one mapping of spanning tree instances to VLANs (hence the term per-VLAN spanning tree). For example, if there exist eight VLANs on a switch, the switch must participate in eight independent spanning trees. This is often undesirable, as the number of actually unique spanning tree topologies is typically less than the number of VLANs (at worst, the two will be equal). Running only a single common spanning tree (CST, which is not supported on Cisco Catalyst switches) would be more efficient, but it does not allow for the design flexibility afforded by PVST.

Multiple Spanning Tree (MST) was created to allow for multiple spanning tree topologies while preserving scalability. MST enables an administrator to map an arbitrary number of VLANs to a single MST instance, resulting in the minimum number of instances needed to satisfy a design. Please visit my blog to keep updated on the various topics I write about. You can reach out to me at:

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