Dictionary · Protocols and Ports
Spanning Tree Protocol
Switching · Intermediate
A family of switching protocols that blocks redundant links so a loop cannot flood frames forever. Rapid versions reconverge faster than the original.
Extra cables are good when something fails, but a loop with no control will multiply frames until the network collapses. This protocol picks a loop-free tree and keeps a backup link ready.
Example: Two uplinks connect an access switch to the core. One is forwarding and the other is blocked until the first fails.
Common misconception
- The same three letters are also used for a shielded cable. In switching, this term means the loop-prevention protocol.