What Is Etherchannel In Computer Networking

In this article you will learn, What is EtherChannel and types of EtherChannel. EtherChannel is a technology which bundle two or more switch port together to get high bandwidth. This technology also known as Link aggregation. When multiple Physical ethernet link combine into single Logical link for sharing and high speed link between Routers, Switches and Servers. Etherchannel also provide redundancy, when one link will down then traffic will pass through another link of bundle. 



What is Etherchannel


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  • It is also called Link Aggregation
  • It is used to aggregate multiple physical link into a single logical link.
  • That logical link called port channel.

What is Etherchannel

Requirement of Etherchannel

  • Duplex must match
  • Speed must match
  • Ethernet standard must match
  • Trunk allowed vlan list must match
  • native vlan must match
  • trunk encapsulation protocol must match
  • prunning eligibility list must match

Note:- after creating etherchannel stp will not work for switch-port which are member of port channel.

Types of etherchannel

  • Static
  • PAGP
  • LACP


  • It stand for port aggregation protocol.
  • it is a cisco proprietary protocol
  • aggregate up to 8 link
  • Modes: Auto 2 Desirable

PAGP Directional mode

Silent : it will create portchannel without checking bidirectional connectivity for every port.

Non-silent: it will check bidirectional  connectivity for every port,both side need desirable.it is used for fiber-optic.


  • It stand for link aggregation control protocol
  • it is open standard protocol
  • it can aggregate up to 16 links in a single channel group
  • only 8 link will participate actively at a time
  • remaining port will remain in hot-stand by state.
  • modes: 1 Active   2 Passive


  • Main switch will elect with using lacp system id(lower)
  • that main switch will elect active port by using port id and it will negotiate with neighbor.

Election of main switch

  • sys-priority (default 32768) 2) sys- mac (base mac)


  • it will elect active port and negotiate with neighbor.

Election of active port

  •  port-priority(default 32768) 2) interface-ID

etherchannel load-balancing algorithm

  • source mac
  • destination mac
  • source and destination mac
  • source ip address
  • destination ip address
  • source and destination ip address
  • source port number
  • destination port number
  • source and destination port number

Read More about EtherChannel  Click Here

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Rakesh Kumar
Rakesh Kumar is a Network engineer and a Blogger. He is crazy for learn and write about Technology , Tech and Computer Tips and Tricks Blog.

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