Switch Trunk
If I understand a Trunk link can be formed between 2 Switches if the ports are:
Trunk-Trunk
Trunk-Auto,Desirable
Auto,Desirable-Auto-Desira
However sometimes , in addition to configuring the port as Trunk, I have seen the command Nonegotiate added.
ports cannot also form a Trunk when they are in 2 different Domains.
I wonder if there is a list that covers all the situations and combinations when 2 switch ports can form a Trunk and when they cannot ?
Thanks
Trunk-Trunk
Trunk-Auto,Desirable
Auto,Desirable-Auto-Desira
However sometimes , in addition to configuring the port as Trunk, I have seen the command Nonegotiate added.
ports cannot also form a Trunk when they are in 2 different Domains.
I wonder if there is a list that covers all the situations and combinations when 2 switch ports can form a Trunk and when they cannot ?
Thanks
Don Johnston
Not sure if I'm interpreting your post correctly, but auto-auto will not result in a trunk.
ASKER
Don,
I know Auto - Auto does not form Trunk
Sometimes they use Switchport Nonegotiate, I wonder what impact does it have in forming a Trunk
Switchport Nonegotiate can be used in conjunction with Switchport mode Access and Switchport mode Trunk.
I know Auto - Auto does not form Trunk
Sometimes they use Switchport Nonegotiate, I wonder what impact does it have in forming a Trunk
Switchport Nonegotiate can be used in conjunction with Switchport mode Access and Switchport mode Trunk.
SOLUTION
membership
This solution is only available to members.
To access this solution, you must be a member of Experts Exchange.
ASKER
I do not understand the usage of trunk nonegotiate other than disabling DTP. what 's the impact of disabling DTP ?
So Trunk will still form regardless if nonegotiate is typed or not as long as you type:
Switch mode Trunk
Which means the Trunk is ON
So Trunk will still form regardless if nonegotiate is typed or not as long as you type:
Switch mode Trunk
Which means the Trunk is ON
SOLUTION
membership
This solution is only available to members.
To access this solution, you must be a member of Experts Exchange.
ASKER
If switchport nonegotiate is issued on port configured with switchport mode trunk command and other side is configured as auto or dynamic desirable, one side will be trunk and other side will be access port.
Which means the Trunk will not form ?
SOLUTION
membership
This solution is only available to members.
To access this solution, you must be a member of Experts Exchange.
ASKER
SO that 's what I concluded, if I am not wrong :
The Trunk will form if both sides are :
-Trunk-Trunk, Trunk-Auto, Desirable-Auto, Desirable-Desirable. Trunk-Desirable.
-if both side are Auto-Auto, the trunk will not form.
-If one port on one side is configured with Switchport mode Trunk/NoNegotiate command and the other side with Switchport mode Trunk, This will form a Trunk.
- If one port on one side is configured with Switchport mode Trunk/NoNegotiate command and the other side with Switchport mode Trunk/Nonegotiate, This will
form a Trunk.
-If one port on one side is configured with Switchport mode Trunk/NoNegotiate command and the other side with Dynamic Desirable, This will Not form a Trunk.
The Trunk will form if both sides are :
-Trunk-Trunk, Trunk-Auto, Desirable-Auto, Desirable-Desirable. Trunk-Desirable.
-if both side are Auto-Auto, the trunk will not form.
-If one port on one side is configured with Switchport mode Trunk/NoNegotiate command and the other side with Switchport mode Trunk, This will form a Trunk.
- If one port on one side is configured with Switchport mode Trunk/NoNegotiate command and the other side with Switchport mode Trunk/Nonegotiate, This will
form a Trunk.
-If one port on one side is configured with Switchport mode Trunk/NoNegotiate command and the other side with Dynamic Desirable, This will Not form a Trunk.
ASKER CERTIFIED SOLUTION
membership
This solution is only available to members.
To access this solution, you must be a member of Experts Exchange.
ASKER
Thank you Guys!