![]() ![]() With excessive flooding, the symptoms are not as apparent. This congestion causes packet loss and leads to a network down situation in the affected L2 domain. If all the links are of the same bandwidth, all links are congested. Once the forwarding loop starts, it congests the lowest-bandwidth links along its path. A forwarding loop (such as an STP loop) occurs when no port in a redundant topology is blocked, and traffic is forwarded in circles indefinitely. The purpose of STP is to block redundant ports based on an STP algorithm, and to resolve redundant physical topology into a tree-like topology. 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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