Only one path can exist between two devices in the same Layer 2 (L2) domain. Issues with most STPs have these three problems:Įxcessive flooding due to a high rate of STP Topology Changes (TC).īecause a bridge has no mechanism to track whether a certain packet is forwarded multiple times (for example, an IP Time to Live ) is used to discard traffic that circulates for too long in the network. There are specific commands which apply to the Catalyst 6500/6000 only however, you can apply most of the principles to any Cisco Catalyst switch that runs Cisco IOS software. This document describes how to use Cisco IOS® software to troubleshoot issues with Spanning Tree Protocol (STP).
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