We have a WAN router which will be used by two different company (previously only one). So to separate the traffic we want to implement the VRF Lite in our WAN Router as we will have two L3 connection to the Provider. We have an isdn backup connection to the PE router in case the connection to the provider is down. The main concern is that when the connection to the provider is down, how can I route 2 vrf traffic in one L3 connection? Let say if the ISDN Connection is in VRF A, how can I route the VRF B traffic though the same link? We use static route.
Any comment will be appreciated.