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Cisco Proprietary Rapid Per-VLAN Spanning Tree (RPVST+) protocol can create problems for networking equipment, such as HP ProCurve devices that use standards-based solutions. This paper addresses some of the problems created by RPVST+, and suggests ways to mitigate the issues of slow convergence time and spanning tree loops. One common scenario where this topology might occur is when customers deploy two access switches either into a cabinet or nearby server to provide Layer 2 redundancy in case of access switch or NIC failure. In this high-availability environment failover and failback times are critical, as they can cause vital systems to fail even with very short re-convergence times.
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