Loop cycle in hubs

[halmulla]

Hi

I am teaching student on networking using packet tracer. I came through some thing that I am trying to figure out.

When I create a loop using hubs the last added connection is getting disabled (down). My questions:

1- How the loop cycle get detected in hubs?

2- Is that applied on real hub devices?

Thank you

[David Ruess]

Hello,

2 questions.

1.) What are you connecting? Is it just 1 hub to itself or Hubs and switches. If the hub is connecting to the switch and the port is being disabled most likely it's the switch that's doing the disabling as it's the one that detected the switch.

2.) Are you sure you're connecting a Hub in Packet Tracer and not some other type of switch?

Keep in mind that packet tracer is a simulator and doesn't have the full functionality of equipment it represents. Maybe in PT the hub does detect a loop because it would run up resources and crash the program if a loop was introduced in a program that simulates network devices.  So, it could be a safety mechanism implemented

Hope that helps

-David

[halmulla]

This is what I am doing.

[David Ruess]

Like I said, not sure if PT limits the loops (even if a real network would have it) to preserve resources since its only a simulator. Try adding switches and disabling spanning-tree.

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