Subinterfaces on Cisco 1720
Is it possible to set up sub interfaces and vlans on a cisco 1720
router with just one fast ethernet port?
If not then that solves everything.
If so this is my problem.
I have a Cisco 1720 with the built in fast ethernet port along with a
T1 card that is not being used.
I want to set up fa0 with sub interfaces such as
fa0.1 = vlan1
fa0.10 = vlan10
fa0.20 = vlan20
however whenever I try to put in the ip address of the sub interface I
get this message
% Configuring IP routing on a LAN subinterface is only allowed if that
subinterface is already configured as part of an IEEE 802.10, IEEE
or ISL vLAN.
whenever I try to put in encapsulation it just errors out since there
are no options for encapsulation. I know I need to set encapsulation
to dot1q but its not an option.
I cannot create a vlan database either.
I am guessing that either its not possible with the 1700 or not
possible with just 1 nic or most likely I am just too dumb to do it.
Im going with option #3 at this point.
Oh ya my IOS version is 12.3(12) perhaps its wrong too.
Any help would be greatly appreciated.
Re: Subinterfaces on Cisco 1720
firstname.lastname@example.org (KJ) writes:
>Is it possible to set up sub interfaces and vlans on a cisco 1720
>router with just one fast ethernet port?
>whenever I try to put in encapsulation it just errors out since there
>are no options for encapsulation. I know I need to set encapsulation
>to dot1q but its not an option.
You need to run at least an IP+ image on your router to do VLAN trunking.
>I cannot create a vlan database either.
Thats for switches, not routers.
>Oh ya my IOS version is 12.3(12) perhaps its wrong too.
Version isn't as important as feature set. 12.3(12) would certainly be
recent enough, but IP + is also needed.
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