I Like To Intentionally Create A Layer 2 Loop in My Lab
I have 2960 and 3750 switches and servers with multiple NIC's and also Some PC's and Hubs.
Would You Tell Me Different Ways to Do That ? (Connections and Commands And Features Which Sould Be Disabled or Enabled)
And Of Course Which Ways We Can Use To Notice That A Loop Has Occured (For Example Packet Sniffers or..)
Yes there are many many ways to make a loop.
scenario 1 would lead to a loop atleast localy in the hub.
add that hub and several other ports to the switch to make a multiloop that will drown the network almost instantly.
Scenario 2 might be considerable but most likely not unless you have a software switch behind them, but there is now way of telling since it is all upt o how you configure them. and there are many parameters so there is not telling what would happen.
No you can not use DHCP for detecting a loop.
but yes the network will go down so it is an indicator but nothing else or more.
well in old switches yes the cpu would go high in a loop, but nowdays most things are done in asics so it would most likely depend on the looped packets if they would cause high cpu.or not.
But I agree with you there is no substitue for experiencing the problems yourself instead of just reading about them.
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