2960 dot1q encapsulation configuration help

Answered Question
Oct 2nd, 2008

I have a 2960 running IOS 12.2 (25r)SEE1, and trying to configure a trunk for dot1q encapsulation. It takes the following statements:

switchport trunk allowed vlan 100

switchport mode trunk

switchport nonegotiate

I'm not sure why I can't change the encapsulation.

I have this problem too.
0 votes
Correct Answer by whiteford about 8 years 1 month ago

If the L2 2960 is like the L2 2950 then the trunk is dot1q by default so you don't need to state it anyway as it can only do this and not ISL, it may not support ISL.

What are you trunking too? I normally force the trunk too my removing the "switchport nonegotiate"

Plz rate if useful

Correct Answer by Jon Marshall about 8 years 1 month ago

You don't need to change it because the 2960 only supports 802.1q ie. it does not support ISL.

So the "switchport trunk encapsulation dot1q" command is not available because it is not needed.

Jon

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Correct Answer
Jon Marshall Thu, 10/02/2008 - 10:54

You don't need to change it because the 2960 only supports 802.1q ie. it does not support ISL.

So the "switchport trunk encapsulation dot1q" command is not available because it is not needed.

Jon

Correct Answer
whiteford Thu, 10/02/2008 - 11:03

If the L2 2960 is like the L2 2950 then the trunk is dot1q by default so you don't need to state it anyway as it can only do this and not ISL, it may not support ISL.

What are you trunking too? I normally force the trunk too my removing the "switchport nonegotiate"

Plz rate if useful

rshum Thu, 10/02/2008 - 11:08

Thanks for the replys I didn't realize ISL was removed from this model of switch LOL.

whiteford Thu, 10/02/2008 - 11:18

It's a L2 switch so if you were thinking of routing between the trunks using your 2960 then you would need a "router on a stick" scenario. Basically the router can control the intervlans and route you traffic between vlans etc, great if you don't have the cash but have a spare router.

Or just upgrade to L3 switch like a 3550, 3650 or 3750 if you can afford one.

Hope this is useful

rshum Thu, 10/02/2008 - 11:20

Nope was just going to go L2 to a 3750 using a straight trunk. I have a separate router on site there to handle L3.

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