On the other hand, most SOHO switches do not implement Spanning Tree. If you are concerned about users installing switches, you need to take other precautions as well.
You can stop the users using a switch to fan out a port, by configuring port security and only allowing one MAC address on the port.
The BPDU guard will give you some protection against certain malicious user practices, even if the rogue switch does not do Spanning Tree. For example, the user who plug in a SOHO switch, and then plugs two other ports of that SOHO switch back-to-back with a cross-cable. In this case, your Catalyst will see its own BPDUs circulating round the loop, and will close the port down. (If the SOHO switch is not doing Spanning Tree, then it will pass the BPDUs through transparently.) This is why you should not have bdpu-guard and bpdu-filter on the same port.
This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
j ai une question j ai achete un routeur cisco 887VA-k9 , je le configuré avec la configuration ci- dessous
si je le lier avec mon pc portable sur l un de ses ports directement ça marche toute est bien ( la connexion internet + m...
Attached policy provides CLI access to the Cisco 4G router over text messaging. Two files are in the attached .tar file:
2. PDF with instructions on how to load and use the .tcl file.