Dell Force10 S4810P S4810 Configuration Guide, FTOS 8.3.10.1 - Page 828

www.dell.com | support.dell.com Create a QoS Policy There are two types of QoS policies: input and output. Input QoS policies regulate Layer 3 and Layer 2 ingress traffic. The regulation mechanisms for input QoS policies are rate policing and setting priority values.There are two types of input QoS policies: Layer 3 and Layer 2. • Layer 3 QoS input policies allow you to rate police and set a DSCP or dot1p value. • Layer 2 QoS input policies allow you to rate police and set a dot1p value. Output QoS policies regulate Layer 3 egress traffic. The regulation mechanisms for output QoS policies are rate limiting, rate shaping, and WRED. Note: When changing a "service-queue" configuration in a QoS policy map, all QoS rules are deleted and re-added automatically to ensure that the order of the rules is maintained. As a result, the Matched Packets value shown in the "show qos statistics" command is reset. Note: To avoid issues caused by misconfiguration, Dell Force10 recommends configuring either DCBX or Egress QoS features, but not both simultaneously. If both DCBX and Egress QoS are enabled at the same time, the DCBX configuration will be applied and unexpected behavior will occur on the Egress QoS. Create an input QoS policy To create an input QoS policy: 1. Create a Layer 3 input QoS policy using the commandqos-policy-input from CONFIGURATION mode. Create a Layer 2 input QoS policy by specifying the keyword layer2 after the command qos-policy-input. 2. Once you create an input QoS policy, do one or more of the following: • Configure policy-based rate policing • Set a DSCP value for egress packets • Set a dot1p value for egress packets Configure policy-based rate policing Rate police ingress traffic using the command rate-police from QOS-POLICY-IN mode. Set a DSCP value for egress packets Set a DSCP value for egress packets is supported only on platform e 828 | Quality of Service (QoS)