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Cisco® Field Manual: Catalyst® Switch Configuration by Steve McQuerry, Dave Hucaby

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5-3. Layer 3 EtherChannels

  • An EtherChannel is the aggregation of multiple physical channels into a single logical connection.

  • The single logical connection is referred to as a port channel.

  • You can configure the port channel to operate as a Layer 3 interface on some switches.

  • When assigned with an IP address, the port channel becomes the logical Layer 3 interface.

  • If any single link of the channel fails, the port channel interface is still accessible through the other links.

  • Layer 3 EtherChannel operation is the same as Layer 2 EtherChannels for traffic distribution and channel establishment.

Configuration

An EtherChannel offers the capability to bond multiple physical connections for greater throughput for links that carry traffic for multiple hosts. ...

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