We have an existing T1 line and cisco 2620 router. The serial interface is using HDLC for L2 encapsulation. We are getting another T1 line that goes to different NOC within the same ISP.
We would like to setup failover so that if one line fails and the other one will still keep the client connections. The two T1 (1.5mb/s each) lines will have to be bundled so that we have 3Mb/s bandwidth. The two T1 lines will be connected to cisco 2651XM with 256MB of RAM.
I would like to know if we should go with PPP or HDLC? or does it even matter?
What's your take on the routing protocol? Should I go with BGP or use static route? I read BGP can't load balance by default. I need to play with Max_path and other options.
We have a number of users who needs VPN in from their home. So the link layer protocol should handle the VPN connections better.