12/31/2022 0 Comments Cisco ios for gns3![]() The service-policy is mostly better applied on the outgoing interface. Note that when Bc and Be are not configured, Bc is calculated by the IOS and Be = Bc on the outgoing interface facing the ISP. So we will configure shape average without Bc and Be. CIR is in bits per second, Bc and Be are in bits.Īlong with CIR, we could configure Bc and Be as well but the IOS says “Recommend not to configure it, the algorithm will find out the best value” (see the screenshot below). With this command the only required parameter is the CIR that has to match the policed bandwidth offered by the ISP. We create a policy-map called SHAPE with a class “class default” where we apply the shape average command. There are more than one shaper queue types and their enumeration is beyond this tutorial’s scope. Traffic shaping is configured with the shape average command. In that case no excess traffic will be allowed. *May be denied by manually setting Be = 0 (default). Traffic shaping is usually configured at the edge of a network and normally in an egress operation to meter a packet flow rate and mark for queue action all packets that exceed the metered rate. The Cisco IOS traffic shaping engine meters traffic against a pre-defined rate and delays the exceeding traffic by keeping it on the buffer to transmit as soon as the current traffic rate drops below the pre-defined rate. It prepares traffic for ingress policing at the ISP’s provider edge router by delaying and queuing exceeding traffic on the customer’s side that would get dropped otherwise on the ISP’s provider edge router. The goal of traffic shaping is to normalize traffic flow and smooth out traffic bursts on the customer’s side. ![]() Traffic shaping is preferred to traffic policing because it allows us to queue and delay excess traffic at burst times in order to send it at a later time instead of immediately dropping it. One possible mechanism we can implement to reduce dropped packets is traffic shaping instead of traffic policing.
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