Couple days before I received an email from one of my readers ( Ahmet Eris ) related with his design. He designed a network infrastructure for his customer and wanted me to take a look as well.
But I realized that Ahmet has some misunderstanding on the usage of MPLS layer 2 VPNs and I thought just briefly mentioning about it can help to my other readers as well.
Update : He allowed me to share his name publicly thus I updated the post by including his name as well. Thanks Ahmet, with this post and the discussions in the comment section, you will help most probably the other people as well.
In his topology, there was remote offices which has only one router that terminates MPLS and 3G links. 3G links would be used as backup and MPLS as primary for all traffic types ( Data,voice and video ).
Ahmet had 2 datacenter which will be used as Active-Standby. Standby data center will be working as disaster recovery center.
In this post I won’t go to detail which technology would be more suitable for the business of his customer but instead I want to touch on very specific requirement.
I suggested him to use MPLS layer 2 VPN service from the provider only if he wants to do IP Traffic engineering, wants to control his WAN himself, don’t rely on Service Provider, more flexible QoS design, better security etc.
But surely MPLS L3 VPN takes the complexity from the customer and handing it over to service provider.
Ahmet understood the pros and cons of MPLS l2 and l3 vpn after our discussion and reading this article from the blog ,but one of his word inspired me to write this post.
“He wouldn’t consider to get an MPLS layer 2 vpn because He doesn’t want to extend all the end device broadcast ”
Yes MPLS layer 2 VPN can give you an ability to extend your l2 between the sites but in his topology, he needs to setup a routing protocol neighborship between his routers. So reachability is necessary only between the routers at layer 2.
Then L3 interfaces will be terminated on the routers and the protocol between the routers can work since will be an IP reachability. MPLS L2 VPN might be implemented by service provider as point to point, in this case 2 routers can talk only with each other or point to multipoint so many of the customer routers could be in the same layer2 domain.
What about you ?
Which MPLS VPN service would you get from the service provider in which case ?
Do you have specific questions related with this design ?
Leave your comment in the comment box below.