Power over Ethernet | 797Configure Quality of Service for an Office VOIP DeploymentThere are multiple ways you can use QoS to map ingress phone and PC traffic so that you can give themeach a different quality of service. See Chapter 41, Quality of Service.Honor the incoming DSCP valueOn both the C-Series or S-Series, if you know traffic originating from the phone is tagged with the DSCPvalue of 46 (EF), you might make the associated queue a strict priority queue, as shown in Figure 36-10;on the C-Series and S-Series, FTOS maps DSCP 46 to queue 2 (see Table 41-5 on page 865 in the QoSchapter.)Figure 36-10. Honoring the DSCP Value on Incoming Voice DataHonor the incoming dot1p valueOn the C-Series, if you know traffic originating from the phone is tagged with a dot1p value of 5, youmight make the associated queue a strict priority queue, as shown in Figure 36-11; on the C-Series, FTOSmaps dot1p priority 5 to queue 2.Figure 36-11. Honoring the Dot1P Value on Incoming Voice TrafficFTOS#sh run policy-map-input!policy-map-input HonorDSCPtrust diffservFTOS#sh run int gigabitethernet 6/11!interface GigabitEthernet 6/11description "IP Phone X"no ip addressportmode hybridswitchportservice-policy input HonorDSCPpower inline autono shutdownFTOS#sh run | grep strict-prioritystrict-priority unicast 2FTOS#sh run int gi 6/10!interface GigabitEthernet 6/10description "IP Phone X"no ip addressportmode hybridswitchportservice-class dynamic dot1ppower inline autono shutdownFTOS#sh run | grep strict-prioritystrict-priority unicast 2
