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July 2012

802.1s – MSTP

The number of STP or RSTP instances that can run on a switch is limited. It is usually enough for most implementations but if you need to run STP on more VLANs, then MSTP is the solution. MSTP maps multiple VLANs to the same STP instance. Even when PVST or …

802.1w – RSTP

Rapid Spanning Tree is an updated version of the original Spanning Tree protocol, standardized as 802.1w. It includes many of the Cisco proprietary features of PVST+. RSTP is backwards compatible with 802.1d STP but it has a few new features. To enable RSTP, use: 1. New features in RSTP 1.1 …