Imagine my environment is all Cisco switches. If my intention is to assure that dot1q is my encapsulation protocol when on trunking mode, is it necessary to do:
switchport mode trunk
switchport trunk encap dot1q <===
switchport trunk allow vlan (...)
In my environment the line 'switchport trunk encap dot1q' is not present in switches. I just want to confirm that is not necessary and DTP would negotiate encapsulation dot1q by default, always? From reading the documentation so far, it is not clear to me if certain platforms could pick ISL as a default, in case 'trunk encapsulation dot1q' is not specified.
Re: Implication if I omit 'switchport trunk encap'
DTP is disabled by specifying either "switchport mode access" or "switchport mode trunk". "switchport mode dynamic auto" is default and not shown in the running config...this enables DTP.
If the switch offers the switchport trunk encap dot1q command, you should use it to specify dot1q (ISL is default). If this command is not present, the switch only supports dot1q, thus making the command unnecessary( since dot1q is the only option).
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.