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Internet Service Providers (ISPs) use routing policies to implement the requirements of business contracts, manage traffic, address security concerns and increase scalability of their network. These routing policies are often a high-level expression of strategies or intentions of the ISP. They have meaning when viewed from a network-wide perspective (e.g., mark on ingress, filter on egress). However, configuring these policies for the Border Gateway Protocol (BGP) is undertaken at a low-level, on a per router basis. Unintended routing outcomes have been observed.
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