> # PortChannels Overview

> PortChannels refer to the aggregation of multiple physical interfaces into one logical interface to provide higher aggregated bandwidth, load balancing, and link redundancy . PortChannels can connect to interfaces across switching modules, so a failure of a switching module cannot bring down the PortChannel link.

> PortChannels on Cisco MDS 9000 Family switches allow flexibility in configuration. This illustrates three possible PortChannel configurations:

> - PortChannel A aggregates two links on two interfaces on the same switching module at each end of a connection.
> - PortChannel B also aggregates two links, but each link is connected to a different switching module. If the switching module goes down, traffic is not affected.
> - PortChannel C aggregates three links. Two links are on the same switching module at each end, while one is connected to a different switching module on switch 2.

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