Cisco catalyst 3850 switch won't take command: "switchport mode trunk encapsulation dot 1q"

[smartd1011]

Hi all,

    I'am working on this switch's configuration. when I typed "switchport mode trunk encapsulation dot 1q", I got an error " invavid input". I'm guessing that this model already set encapsulation type to dot 1q, and that's why the switch won't take it, right? 

   Please help!

[Aaron Harrison]

Hi

You don't put the word 'mode' in there.

Remember, the ? key is the only command you need to know when configuring Cisco kit :-)

Regards

Aaron

[smartd1011]

Hi Aaron,

    your are right. comes to CLI,  "? key" should be my best friend. I don't have to remember hundreds of command any more. hehe.

Thank you for the tip!

Take care

[Jon Marshall · Accepted solution]

According to the documents it supports both.

You are however using the wrong command, it should be -

"switchport trunk encapsulation dot1q"

ie. no "mode" keyword.

If it doesn't take that then do a "sh int <x> capabilities" and it should show you which encapsulation methods are supported.

Jon

[mannumx]

Hi Jon!

Actually I don´t have that option.

SW-CORE-MCO(config-if)#switchport trunk ?
allowed   Set allowed VLAN characteristics when interface is in trunking mode
native      Set trunking native characteristics when interface is in trunking
mode
pruning   Set pruning VLAN characteristics when interface is in trunking mode

[smartd1011]

hey, Jon

how are you?

Thank you for your tip again!

[scorpio20]

You are right it is set by default......

you don't have to run this command anymore.

You can see with show interface x/x switchport , once its sets to trunk that's enough.

for example; sh int gi0/1 switchport

Access Port should have these option;
Administrative Mode: static access
Negotiation of Trunking: Off

***Trunk Port should have these option;
Administrative Mode: trunk
Negotiation of Trunking: On