(Lag) Link Aggregation

Technology in Network Switch to increase more throughput. The idea is to achieve better performance by sending several packets simultaneously down different links.

By default in a Network Switch, only single connection at a time can be active.

For example
==⚠ Switch to EXCALIDRAW VIEW in the MORE OPTIONS menu of this document. ⚠== You can decompress Drawing data with the command palette: 'Decompress current Excalidraw file'. For more info check in plugin settings under 'Saving'

Excalidraw Data

Text Elements

Switch B ^9OuBXzvf

Switch A ^umhsECMO

active ^o8GiBIkb

inactive ^3R1nRSwD

inactive ^UKnEyRFI

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The other ones will be blocked and acts as a fallover for the first one. This is to prevent Switching Loop

(LAG) Link aggregation allows multiple switch to simultaneously active all interface at the same time

The way that it works is it creates logical interface associated with physical ports

A port failure will not trigger STP convergence process

Dynamic LAG

Rather than manually configure LAG, it's recommended to use dynamic configuration which use the negotiation over physical ports and disable the failure connection.

To configure dynamically, we can use

  1. LACP (Link Aggregation Control Protocol)
  2. PAgP (Port Aggregation Protocol)