Configuring vlans over serial wan links

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Apr 17th, 2007
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i have a cisco 7206 router sitting in my headoffice,the router connecte several other remote site to the Headoffice,like close to 20 remote areas.

on the side of the 7206 i have atm configured and on the remote areas its frame-relay.

all the remote sites including the head office are in the 10.x.x.x/20 network and its just a flat big network.

i want to configure end to end vlans do i create vlans over serial links,encapsulated with frame-relay.

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paolo bevilacqua Wed, 04/18/2007 - 03:01
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I suggest you move away from the big flat network and use routing for you branches.

You will have a networks that is faster, easier to maintain and diagnose.

However, if you need to carry VLAN on the serial, the simpler thing would be requesting additional PVCs, one for each VLAN to carry.

As you see bridging only makes things more complicated so why not use routing instead.

akobwaycct Wed, 04/18/2007 - 04:48
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ok say i want to carry vlans on the existing pvc how do i do it,i am actually using EIGR

P,but then at the head office there are so many departments and i want to try and put them in vlans ...these departments extends to other remote areas so how can i extend these vlans to other remote areas over the wan

paolo bevilacqua Wed, 04/18/2007 - 05:44
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hi, to carry multiple VLAN over a single PVC you would need features like Ethernet ove MPLS, that are complicated to configure, reuire latest software and can cause issues in most customer networks.

For this is better that you just use subnets and routing for the remote departments and things will work nicely anyway.

If you want VLAN in the remote site that is ok, the router destination router will send the packet to the right VLAN based on L3 address.

VLANs are a concept tough for local area and campus, and it scales poorly when you try to extend it beyond it's natural scope - that is a LAN.

akobwaycct Wed, 04/18/2007 - 21:53
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so how do i go about extending the vlans to the remote site,i am quite comfortable with configuring vlans in a campus environment the problem is now to extend the vlans over the wan.


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