Chapter 2 Spanning Tree Protocols

THE CCNP ENCOR EXAM OBJECTIVES COVERED IN THIS CHAPTER INCLUDE THE FOLLOWING:

  • Domain 3.0: Infrastructure
    • ✓ 3.1  Layer 2

images  Unlike IP packets, Ethernet frames don't have a time-to-live (TTL) to prevent routing loops. That means if a LAN is configured in a physical loop, it may blindly forward the same frame over and over again. Switches don't keep track of frames they've already seen, so in a looped topology, a switch actually ends up multiplying the same frame in the network each time it forwards it! Eventually, this consumes all available bandwidth and pegs the CPU on each switch, causing a network meltdown. ...

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