12-05-2012 07:13 AM - edited 03-07-2019 10:25 AM
I have a 3750 and when I configure a trunk port I cannot set the port: switch port mode trunk as I do in the 2960
If I type switchport mode ? On the 3750 I see ......
Access
Dot1q-tunnel
Dynamic
Private-vlan
Trunk
Under the 2960 when I do the same I get
Access
Dynamic
Trunk
Is setting a trunk up on a 3750 different than a 2960 ? Do I have to up grade the iOS on the 3750?
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12-05-2012 07:16 AM
Hi,
maybe my glasses should be replaced but I see the keyword Trunk in both platform outputs you posted.
Regards.
Alain
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12-05-2012 07:33 AM
when configuring a trunk on the 2960
I just go to the interface like :
interface giga 1/0/1
Then type (switchport mode trunk)
No I just set my native vlan on the trunk and asighn the vlans I want on the trunk. I do the same on my cisco 4503 router.
But this cisco 3750 when I do it.
I type the same command in the interface and I get:
Command rejected: An interface whose trunk encapsulation is "Auto" can not be co
nfigured to "trunk" mode.
I have to set the trunk to : dot1q-tunnel first
any one know why???
12-05-2012 07:27 AM
Are you refering to encapsulation type?, Trunk is in both switches
HTH
12-05-2012 07:34 AM
I dont have to set the encapsulation type on the 2960 . How come I have to do it on the 3750?
12-05-2012 07:53 AM
Hi,
because these are different platforms supporting different trunking encapsulation types and which have different default config. So do first switchport trunk encapsulation dot1q then issue switchport mode trunk and then do as you do on other switches.
Regards.
Alain
Don't forget to rate helpful posts.
12-05-2012 08:34 AM
I dont have to set the encapsulation type on the 2960 . How come I have to do it on the 3750?
The 2960 doesn't have "switchport encapsulation" command, because it only supports dot1q, which is default.
HTH
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