Tagged frames on router 1841

Unanswered Question
Mar 19th, 2007
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Hello everybody!

Is it possible to estabish tagged communication (using tagged ports and frames) between router 1841 and LAN switch (for example Allied Telesn 9924)to send and receive frames to a few vlans defined on switch over one physical link?

Switch can support tagged ports and frames but I don't know if router can.

Thanks for any help.

Jan Zglobica

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Amit Singh Mon, 03/19/2007 - 03:52
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  • Cisco Employee,

Jan,


Yes, you can configure that. Configure sub-interfaces on the router's interface and use the vlan tagging to route the traffic between the vlans.


For example:


int fa0/1

ip address 10.0.1.49 255.255.255.240


int fa0/1

no ip address


int fa0/1.1

encap dot1Q 1 native

ip address 10.0.1.49 255.255.255.240


int fa0/1.2

encap dot1Q 2

ip address 10.0.3.1 255.255.255.0


int fa0/1.3

encap dot1Q 5

ip address 10.0.6.1 255.255.255.0


int fa0/1.4

encap dot1Q 6

ip address 10.0.7.1 255.255.255.0


int fa0/1.5

encap dot1Q 3

ip address 10.0.5.1 255.255.255.0


HTH,

-amit singh

janzglobica Mon, 03/19/2007 - 04:42
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Thank You for answer.

One question more:

Will VLANS remain separated?

I want to establish only internet connection to sepatated VLANS without routing between VLANS.

Jan Zglobica

Amit Singh Mon, 03/19/2007 - 05:04
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  • Cisco Employee,

Jan,


you have to create sub-inbterfaces on the router for which you want the inter-vlan routing or even to have vlan go to the internet. In that case vlans will be able to talk to each other. use router ACL's to deny the traffic from one vlan to another vlan.


HTH,Please rate if it does.


-amit singh

janzglobica Tue, 03/20/2007 - 09:49
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Thank You Amit for answer ones more.

This is very helpful for me but I can't quickly confirm that it acts because I haven't internet connection in that location so far.I prepare to configure LAN in new place.

Jan Zglobica

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