In a typical enterprise network, traffic policing is often implemented at the access or distribution layer to limit certain traffic classes before that traffic exits the campus onto the WAN. Traffic shaping is often implemented at the WAN edge when there are speed mismatches or oversubscription.
In a typical service provider network, traffic policing is often implemented inbound at the provider edge (PE) router to rate-limit incoming traffic from the customer edge (CE) router to ensure that the customer traffic rate is not exceeding the contractual rate. Traffic shaping is often implemented outbound at the PE and at the CE to limit the traffic rate between the PE and CE and to allow for FRF. 12 fragmentation on Frame Relay connections between the PE and the CE.
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