Can 1841 support VLAN 802.1Q tagging

Answered Question
Jun 20th, 2007

We have a Cisco 1841 Modular Router that needs to accept 802.1Q Vlan tagging with subsequent VLAN interfaces and IP Addressing. We only have FA0/0 and FA0/1.

I dont see any commands for 802.1q tagging.

Di I need to get an add on HWIC to do this or will it work with what I have and if so can someone point me to a write up.

Thanks

Bill

I have this problem too.
0 votes
Correct Answer by pstebner1 about 9 years 5 months ago

You'll have to create subinterfaces on those fastE ports, and then they'll support trunking.

i.e.:

interface fastethernet0/0

no ip address

interface fastethernet0/0.10

description VLAN10

encapsulation dot1q 10

ip address ww.xx.yy.zz

etc.

HTH,

Paul

edit - I see that I got beat twice! Nevermind!

Correct Answer by Edison Ortiz about 9 years 5 months ago

I don't have a 1841 at the moment but in general , you do dot1q on routers like this:

interface f0/0

no ip address

interface f0/0.100

encapsulation dot1q 100

ip address 192.168.100.1 255.255.255.0

interface f0/0.101

encapsulation dot1q 101

ip address 192.168.101.1 255.255.255.0

Make sure the switch connected to F0/0 has dot1q trunking enabled.

Correct Answer by farkascsgy about 9 years 5 months ago

Hello,

You can use subinterfaces...

intareface fa 0/1.100

encapsulation dot1q 100

ip address x.x.x.x x.x.x.x

in this case Fa0/1.100 is sitting on vlan 100 and tags all packet with vlan 100, number of the subenterface can be different number. encapsulation command defines teh vlan number.

You can do InterVlan routing with this technique or what you want...

bye

FCS

Please rate me if I helped.

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Correct Answer
farkascsgy Wed, 06/20/2007 - 11:22

Hello,

You can use subinterfaces...

intareface fa 0/1.100

encapsulation dot1q 100

ip address x.x.x.x x.x.x.x

in this case Fa0/1.100 is sitting on vlan 100 and tags all packet with vlan 100, number of the subenterface can be different number. encapsulation command defines teh vlan number.

You can do InterVlan routing with this technique or what you want...

bye

FCS

Please rate me if I helped.

Correct Answer
Edison Ortiz Wed, 06/20/2007 - 11:23

I don't have a 1841 at the moment but in general , you do dot1q on routers like this:

interface f0/0

no ip address

interface f0/0.100

encapsulation dot1q 100

ip address 192.168.100.1 255.255.255.0

interface f0/0.101

encapsulation dot1q 101

ip address 192.168.101.1 255.255.255.0

Make sure the switch connected to F0/0 has dot1q trunking enabled.

Correct Answer
pstebner1 Wed, 06/20/2007 - 11:24

You'll have to create subinterfaces on those fastE ports, and then they'll support trunking.

i.e.:

interface fastethernet0/0

no ip address

interface fastethernet0/0.10

description VLAN10

encapsulation dot1q 10

ip address ww.xx.yy.zz

etc.

HTH,

Paul

edit - I see that I got beat twice! Nevermind!

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