Redundant or fail-over links technologies are a good idea to implement between switches. This is because they are used to help avoiding complete network failures if one link fails. Even though redundant links are extremely helpful, they may be causing more problems than they seems to solve.
Because if it happens, frames can storm all redundant links simultaneously, in this case network loops can occur, even among other problems. Some of the most serious problems
We will be discussing in this blog post.
If we didn’t take loop avoidance schemes seriously, the switches will flood
broadcasts endlessly throughout the internetwork. This is sometimes
referred to as a broadcast storm and it may be propagated throughout the network
A device can receive multiple copies of the same frame since the frame
can arrive from different segments at the same time.
At this point, the MAC address filter table will be confused about where a device is
located since the switch can receive the frame from more than one
link. It is possible that the switch can’t forward a frame because it is
constantly updating the MAC filter table with source hardware
address locations. This is called thrashing the MAC table.
One of the biggest problems is multiple loops generating throughout
an internetwork. This means that loops can occur within other loops.
If a broadcast storm occur were loop already occur, the network would not be
able to perform packet switching.