Is there anyway to detect if the two ends of an 802.1q trunk have the same allowed VLAN list ? Does CDP doe anything here ? What will a switch report if it receives a packet that is tagged with a VLAN id that is not on it's allowed list from its partner on the other end of the trunk ? I am assuming here that evrything else about the trunk is OK so native VLANs match etc.
I am afraid there is no such feature to inform you that the neighbor's allowed VLAN list is different from yours. CDP does not carry this information. No logging messages will be logged for frames arriving in unallowed VLANs. You could see side effects from this mismatch (such as inappropriate STP port roles) but nothing conclusive.
It is best to verify that setting manually from both sides of a trunk if possible
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.