The basic setup instructions are outlined in this document. https://knowledgebase.paloaltonetworks.com/KCSArticleDetail?id=kA10g000000ClS0CAK But the one thing to bear in mind is that you can only control the egress traffic. And on internet links frequently the issue will be with the ingress traffic being what is overwhelming the pipe. So while this helps, it won't solve all capacity issues.
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