mGRE in Provider network

devang_etcom · ‎01-08-2009

Hi,

I was reading one case study in CISCO IOS MPLS configuration of Cisco Press book. There they have three PE routers PE1/PE2/PE3 is connected with P routers in core as well as connected with CE1/CE2/CE3 of customer A respectively.

now what is the need of mGRE there as all the CE facing interfaces of PE routers are part of VRF custA? how can i take advantages of mGRE in such kind of environment? Actually i need deployment idea of mGRE in MPLS VPN environment.

thanks

Devang Patel

Giuseppe Larosa · ‎01-08-2009

Hello Devang,

there are still big providers around the world that have decided to not implement MPLS.

So to provide L3 VPN services over a non mpls backbone you can use L2TPv3 or mGRE that are better then a mesh of point to point GRE tunnels.

Hope to help

Giuseppe

devang_etcom · ‎01-08-2009

Giuseppe,

Thanks for your reply! but if you will take a look at that case study as well as in my post also mentioned that they are using MPLS VPN in their network!

regards

Devang Patel

Giuseppe Larosa · ‎01-09-2009

Hello Devang,

I misunderstood your question and actually I haven't that book.

One possible reason could that to implement a DMVPN in order to provide CE to CE encryption but it is hard to guess without seeing the case study.

Hope to help

Giuseppe