The final section of this chapter describes the EtherChannel Guard feature, which is an optional Cisco STP feature designed to protect the Spanning Tree Protocol network when using Layer 2 EtherChannel trunks. The EtherChannel Guard feature is designed to detect an EtherChannel misconfiguration between the switch and another connected device.
For example, a misconfiguration can occur if the local switch interfaces are configured in an EtherChannel, but the interfaces on the other device are not. A misconfiguration can also occur if the channel parameters are not the same at both ends of the EtherChannel. If the switch detects a misconfiguration . . .
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