An approach to build stable spanning tree topology

Abstract

This paper considers stability problems regarding topology produced by a spanning tree algorithm in transparent bridged networks, and presents an approach to build a stable spanning tree structure that is not dependent on a root bridge. This approach relies on tuning spanning-tree port cost in a way that the produced topology resists possible attacks or newly connected misconfigured bridges. Special care was taken to ensure stability in transition periods, where bridges negotiate about a new root. This approach is completely standards-based and requires only that is possible to tune link costs of switch/bridge ports.