VPLS Q-in-Q & BGP

[Pieter de jong]

Good morning,

Just after everyones thoughts here. We are putting in a VPLS circuit between 3 sites. We want to run BGP between sites (it has to be BGP as there are backup circuits and we need routes controls). The other requirement is also the ability to span a vlan across two sites. We will be using the ASR1001 for connectivity.

My thoughts are to use Q-in-q to terminate layer 2 to layer 3. But I can't fathom how I would create the config to do both layer 2 & layer 3 on the same interface (or subinterface).

Any comments would be great

Cheers

[Giuseppe Larosa]

Hello Pieter,

the VPLS facing interface will be OSI Layer3 for your network devices

You need a service to transport L2 802.1Q frames over a routed IP network. A possible solution is L2TPv3 vlan based

see

http://www.cisco.com/en/US/docs/ios/12_3t/12_3t2/feature/guide/gtl2tpv3.html

http://www.cisco.com/en/US/docs/ios/12_3t/12_3t2/feature/guide/gtl2tpv3.html#wp1043064

You will need a dedicated subinterface on another interface connected to the internal LAN switches and you will be able to carry multiple Vlan if desired.

The L2TPv3 service is point to point in nature so it can fit your requirements to span selected vlan(s) between two sites.

You should verify with Feature Navigator if L2TPv3 is supported in IOS XE version of your ASR 1001 devices

http://www.cisco.com/go/fn

Edit:

according to feature navigator L2TPv3 is supported on ASR 1001 including the universal and universal no payload encryption packages

Hope to help

Giuseppe

[Pieter de jong]

Thanks Giuseppe,

Appreciate you taking the time out to post such an informative answer.

Regards

Pieter