Dell Force10 S4820T S4820T Configuration Guide - Page 757

38 Quality of Service (QoS) Quality of Service (QoS) is supported on platforms: e c s S4820T Differentiated service is accomplished by classifying and queuing traffic, and assigning priorities to those queues. The E-Series has eight unicast queues per port and 128 multicast queues per-port pipe. Traffic is queued on ingress and egress. By default, on ingress, all data traffic is mapped to Queue 0, and all control traffic is mapped to Queue 7. On egress control traffic is mapped across all eight queues. All queues are serviced using the Weighted Fair Queuing scheduling algorithm. You can only manage queuing prioritization on egress. The C-Series traffic has eight queues per port. Four queues are for data traffic and four are for control traffic. All queues are serviced using the Deficit Round Robin scheduling algorithm. You can only manage queuing prioritization on egress. Table 38-1. FTOS Support for Port-based, Policy-based, and Multicast QoS Features Feature Port-based QoS Configurations Set dot1p Priorities for Incoming Traffic Honor dot1p Priorities on Ingress Traffic Configure Port-based Rate Policing Configure Port-based Rate Limiting Configure Port-based Rate Shaping Policy-based QoS Configurations Classify Traffic Create a Layer 3 class map Set DSCP values for egress packets based on flow Create a Layer 2 class map Create a QoS Policy Platform c e s c e s c e s c e s e c e s c e s c e s c e s e c e s c e s Direction Ingress + Egress Ingress Egress Ingress + Egress Ingress Ingress + Egress Quality of Service (QoS) | 757