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New Member

vlan on router 3600 subinterface

I'am using router 3640

IOS : 12.0(5)1 release software (fc1)

ROM : 11.1(20)AA2

I want to apply vlan encapsulation on ether or fastether sub interface

I tried to find "encapsulation dot1q..." with "?" marker in the subinterface and it does'nt exist.

Is it possible to apply vlan on subinterface with a more recent IOS version on router 3600 ?



Re: vlan on router 3600 subinterface


Use the Cisco Feature Navigator to find an IOS that supports dot1q for your router:

"IEEE 802.1Q VLAN Trunking"

And please be informed that the encapsulation command is only available under the subinterface not the main interface.

NOTE: Its not supported in IPBase feature set.

HTH, please do rate all helpful replies,

Mohammed Mahmoud.

Re: vlan on router 3600 subinterface


try issuing the following commands

interface fastethernet 0/0

no ip address

interface fastethernet 0/0.1

encapsulation dot1Q 1

ip address

interface fastethernet 0/0.2

enacapsulation dot1Q 2

ip address

New Member

Re: vlan on router 3600 subinterface

Hi there,

it sounds to me that most of recent routers

support this feature .and also i've checked

the does support.

Try to reload your router!

or if you've got another router try to replace

your IOS with another one.


Re: vlan on router 3600 subinterface

Must have at leaST ip plus software to run vlans . Also that is a very old version that may not even support it . 12.0 is EOL now I believe.

New Member

Re: vlan on router 3600 subinterface

After checking too I thing that I need IP plus instead of IP features set

and may be I need more RAM / flash

IOS image I thing is OK