I Have two Routers (Cisco 2821) connected one at my Main Office & Other at Branch Office. I have taken two MPLS Link from two different Service provider and created GRE Tunnel using MPLS Source & Destination IPs.
Now I want to merge bandwidth of this two different Tunnel and want to send traffic through the new Tunnel. Is it possible ?
What is your use case on having a GRE tunnel (with encryption?) on the MPLS circuits? Are you using an IGP across the GRE tunnels? Are the MPLS circuits the same speed?
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A single tunnel will be seen as a single flow and will be distributed across your paths as would a single flow (which normally would use just one path).
If you had packet-by-packet LB, the tunnel's packets should flow across multiple paths (although this can lead to out-of-order delivery and is generally not recommended).