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The frames on the switch go round and round, round and round and round and round (lemmy.zip)

submitted 2 months ago by [email protected] to c/memes

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[–] [email protected] 24 points 2 months ago (2 children)

I love that you can plug a switch into itself that essentially causes a data short circuit of the switch talking to itself without realising it.

[–] friend_of_satan 23 points 2 months ago* (last edited 2 months ago)

Unless the switch has STP enabled.

The Spanning Tree Protocol (STP) is a network protocol that builds a loop-free logical topology for Ethernet networks.

[–] [email protected] 19 points 2 months ago (1 children)

Why is the switch talking to itself? Is it stupid??

[–] [email protected] 38 points 2 months ago (2 children)

Switches are kind of stupid from a hardware perspective. A basic switch just has a lookup table that has all the connected devices and if it can't find the destination address in the switch sends it out on all ports. There are protocols to handle this but they add overhead and are only available on higher end devices.

You can imagine what kind of chaos this could cause

[–] SpaceNoodle 10 points 2 months ago

No need to imagine, I've done it myself!

[–] takeda 6 points 2 months ago (1 children)

I'm still puzzled though. Is switch initiative the ARP request? I though that since nothing (that can communicate) is connected to it except itself, it would be just quiet.

[–] [email protected] 2 points 2 months ago (1 children)

You just connect your laptop and run a broadcast ping

Problem solved

[–] takeda 1 points 2 months ago

I see, so that's how you bootstrapped it?