Encapsulation dot1Q

Answered Question
Sep 8th, 2008

any one know why my 2900xl wont take the encapsulation dot1Q command it is using version 12.3

I have this problem too.
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Correct Answer by Giuseppe Larosa about 8 years 3 months ago

Hello Shane,

some low end switches support only ISL and others support only 802.1Q. Try to use ISL on both ends of the links.

For this reason some switches don't even accept the command switchport trunk encapsulation with any parameter because there is no choice

Hope to help

Giuseppe

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Correct Answer
Giuseppe Larosa Mon, 09/08/2008 - 11:23

Hello Shane,

some low end switches support only ISL and others support only 802.1Q. Try to use ISL on both ends of the links.

For this reason some switches don't even accept the command switchport trunk encapsulation with any parameter because there is no choice

Hope to help

Giuseppe

matej.polak Mon, 09/08/2008 - 12:13

Hi,

are you using these commands?

switchport mode trunk

switchport trunk encapsulation dot1q

2900xl does not have 12.3 version.

naitsirhc81 Mon, 09/08/2008 - 17:24

It will only support dot1q. Therefore there is no need to specify your encapsulation.

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