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BCMSN Exam Cram™ 2 (Exam Cram 642-811) by Richard A. Deal

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EtherChannels

EtherChannels are technology that enables you to aggregate up to 8 Fast Ethernet or Gigabit Ethernet connections, providing up to 1,600Mbps or 16Gbps of bandwidth (in full duplex mode). The channel is treated as one logical connection between two switches. Even if one of the connections fails in the EtherChannel, the other connections still operate properly. EtherChannels are supported for both Layer 2 and Layer 3 connections.

Operation of EtherChannels

A link failure is transparent to the user because traffic is rerouted across another of the channel connections in less than a handful of milliseconds. When a failure occurs, the Ethernet controller sends information to the switch's processor about the failure, and the processor ...

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