1700 Router - creating a dot1q VLAN subinterface

1700 Router - creating a dot1q VLAN subinterface

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Subject Author Date
1700 Router - creating a dot1q VLAN subinterface Arthur Brain 07-05-2007
Posted by Arthur Brain on July 5, 2007, 9:49 pm
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This is my inward-facing, ethernet interface:

interface FastEthernet0
description LAN
ip address 10.1.1.1 255.255.255.0

This is what happens when I create a sub-interface (Fa0.1) and try to
give it dot1Q configuration:

Router_1700(config-subif)#encapsulation dot1q 2
^
% Invalid input detected at '^' marker.

sh ver shows I have 12.2(29a) on this router.

What am I missing?


Posted by Mike Dorn on July 5, 2007, 11:09 pm
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Arthur Brain wrote:

> This is my inward-facing, ethernet interface:
>
> interface FastEthernet0
> description LAN
> ip address 10.1.1.1 255.255.255.0
>
> This is what happens when I create a sub-interface (Fa0.1) and try to
> give it dot1Q configuration:
>
> Router_1700(config-subif)#encapsulation dot1q 2
> ^
> % Invalid input detected at '^' marker.
>
> sh ver shows I have 12.2(29a) on this router.
>
> What am I missing?
>
You're missing the fact that not all models of 1700 support dot1q encapsulation.
Only the 1721, 1751, and if memory serves, 1760 can do this. 1720 & 1750
cannot. Check the fine print on the specs pages.


Posted by Arthur Brain on July 6, 2007, 1:55 am
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Mike Dorn wrote:
> Arthur Brain wrote:
>
> > This is my inward-facing, ethernet interface:
> >
> > interface FastEthernet0
> > description LAN
> > ip address 10.1.1.1 255.255.255.0
> >
> > This is what happens when I create a sub-interface (Fa0.1) and try to
> > give it dot1Q configuration:
> >
> > Router_1700(config-subif)#encapsulation dot1q 2
> > ^
> > % Invalid input detected at '^' marker.
> >
> > sh ver shows I have 12.2(29a) on this router.
> >
> > What am I missing?
> >
> You're missing the fact that not all models of 1700 support dot1q
encapsulation.
> Only the 1721, 1751, and if memory serves, 1760 can do this. 1720 & 1750
> cannot. Check the fine print on the specs pages.

aah.
I assumed the frame format would be entirely a software-related
question - I never considered there would be a hardware dependency.


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