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Much depends on how you want to "share".
The 2800 supports policing on ingress or egress traffic, and shaping and bandwidth proportions on egress traffic.
It would be easy to provide each branch 50% of your egress bandwidth, but although you can police ingress traffic, "managing" ingress traffic doesn't work nearly as well as "managing" egress traffic. Ingress traffic "management" is best done with a traffic management appliance.
If your FE hand-off running at 10 or 100? (If running at 100, you'll probably what to shape.)
What version of IOS are you running? (QoS features change with IOS versions.)
