Hi Hitesh Along side to what @ww suggests. You may consider the Solution 2 too. You may also consider to Add another MX84 in the Topology and Let your 2 ISPs terminate there. This gives you complete visibility of your network allowing you to utilize all the links simultaneously. Having said that ideally 2 good ISPs is a better option. You may consider avoiding 3rd ISP to keep the architecture simple. Also 1200 Users Load on MX84. I am not sure if you will be interested in doing this.
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