I ran into an issue with SnapProtect resetting my SnapMirror throttles to unlimited every time it would initiate a Aux Copy; saturating the 1Gbps link between two datacenters. I tried a script provided by NetApp Professional services that did not work. I have created the following script that is working for me.
UPDATE - 23 JAN 2017: I ran into an issue with the script managing uninitialized SnapMirror relationships; so I have updated the script to include logic for addressing this issue.