We hired a 4 mbps link between our plant at Brazil and the plant at Argentina. At remote side it was delivered a full 4 Mbps channel, but at Brasil 02x 02 mbps links and that's when the problem shows up. Provider is trying to use BGP, so I'd like somebody cleared to why this should be the best solution, and what is the danger of this traffic be propagated at our OSPF network.
I thanks if somebody please help me.
I would assume that this is NOT point-to-point link between your two sites and that each site connects to TelMex router, correct?
If this is the case, the best way for you to go is not to use BGP with Loopback to Loopback setup for loadbalancing, but to use link aggregation method on the side with 2x2Mb. The easiest one is MLPPP (multilink PPP). You need TelMex to configure MLPPP on their router and you will need to configure on yours.
This will create a logical Multilink interface with IP assigned to it. You can then run a tunnel (GRE) between your two sites and extend your OSPF process over this tunnel.
If TelMex are provisioning a Frame Relay PVCs for you, you can MLFR (multilink Frame Relay) to achieve the same results as MLPPP.