Hi Vinod,
If need use vrf-import and vrf-export it need a lot changes in entire PE customer because the existing network dont use community style. The just use vrf-target target:x:x to make sure other VRF in other PE can communicate each other. Beside use vrf-import and vrf-export is there any way more simplest with minimal outage. I'm not sure if i'm use rib-group style can mde big outage if i make config mistake.
Thanks and appreciate some info.