Our branches have 2 WAN lines. The main line is using BGP and we use default with admin distance of 220 facing to the DSL (we use the VPN for the backup). So the idea is when the BGP line drops/down, the traffic will go to the default route (DSL). However, everytime this happens, the branch emails (outlook) will not work. Others may be able to access and some can't. All the other applications are working fine.
Please tell me what should we do. Thanks.