This video explains the following topics.
What are Layer 2 switching loops?
Why do Layer 2 switching loops occur?
What is a redundant link?
What is the use of a redundant link?
How does a redundant link work?
What is a broadcast storm?
The effect of a switch loop over a network
How switches learn MAC addresses
Why do switches always forward broadcast frames
How do broadcast frames trap in switching loops
What is an unstable CAM table
How does a switching loop make the CAM table unstable
This video is based on the following tutorial.
www.computernetworkingnotes.c...
Video description
For backup purposes, administrators create redundant links. A redundant link is a backup link of the primary link. If the primary link fails, the redundant link prevents the network from going down. The redundant or backup link is helpful only when the primary link fails. Until the primary link is functioning, the backup link should be disabled. If both are enabled, it creates a switching loop.
If we connect two switches with a single link, the link will work as a primary link. As long as the switches have only one link, there will be no loop between the switches.
However, connecting switches with a single link always has a chance of connectivity loss. If switches work in the core layer, it could bring the entire network down. To avoid this situation, administrators use backup links.
However, using more than one link between two switches creates switching loops. A switching loop creates many performance-related issues. Among them, three are the main ones.
These are broadcast storms, unstable CAM tables, and network bandwidth.