Etherchannel, LAG, portchannel and friends

[askbow]

An EtherChannel is a way to use multiple physical interfaces as a single logical one. That logical one appears as a single interface to MAC table, STP and management plane. That solves two main concerns: it adds bandwidth and it prevents STP from considering several parallel links a loop, thus preventing it from being blocked.

http://askbow.com/2015/06/30/etherchannel-lag-portchannel-and-friends/