Understanding Etherchannel Guard - Cisco IE 3000 Software Configuration Manual

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Configuring Optional Spanning-Tree Features

If a new switch is introduced into a shared-medium topology as shown in

not activated because the inferior BPDUs did not come from the recognized designated switch

(Switch B). The new switch begins sending inferior BPDUs that indicate it is the root switch. However,

the other switches ignore these inferior BPDUs, and the new switch learns that Switch B is the

designated switch to Switch A, the root switch.

Understanding EtherChannel Guard

You can use EtherChannel guard to detect an EtherChannel misconfiguration between the switch and a

connected device. A misconfiguration can occur if the 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. For EtherChannel configuration

guidelines, see the

If the switch detects a misconfiguration on the other device, EtherChannel guard places the switch

interfaces in the error-disabled state, and displays an error message.

You can enable this feature by using the spanning-tree etherchannel guard misconfig global

configuration command.

BackboneFast Example After Indirect Link Failure

Link failure

BackboneFast changes port

through listening and learning

states to forwarding state.

Adding a Switch in a Shared-Medium Topology

Blocked port

"EtherChannel Configuration Guidelines" section on page

Understanding Optional Spanning-Tree Features

(Designated bridge)

Added switch

Cisco IE 3000 Switch Software Configuration Guide

18-7, BackboneFast is

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