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Which woud be optimal, Load Balance or Load Sharing?

Last Modified: 2012-10-11
Attached is quick image of what I'm trying to accomplish. Currently, all of our branches are connected to our servers at our data center via MPLS using BGP. The MPLS router is a Cisco 2921.

One of our branches is constantly using the entire 1.5M line. Instead of increasing the speed of their T1 current line, which would cost $$$, I'd like to install a cheaper cable line at that office and use load balancing or load sharing. I'm not sure which route to go here. At the branch I have a Cisco 1921. The MPLS T1 is 1.5x1.5M, the cable line is 10x2M.

Somehow, I'd like to get the branch connected to the DC using the MPLS network and then connect them via VPN over the second ISP. I assume I should connect the 1921 VPN directly to the 2921, instead of the ASA 5510. ?

The branch employees are always complaining about slowness so I'd rather not use the 2nd line as a spare, but instead split the traffic up to lighten the load on the MPLS T1, or vice versa and use them as backups in case one fails.

Can someone recommend what configuration would work best for my scenario and then help me configure it?

I've read the following articles but I can't wrap my head around them... http://www.cisco.com/en/US/docs/solutions/Enterprise/WAN_and_MAN/VPNLoad/VPN_Load.html
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