Dell Force10 S55T S55 Configuration Guide FTOS 8.3.5.3 - Page 563
Con Port-based Rate Policing, Priority-tagged Frames on the Default VLAN
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On the C-Series and S-Series you can configure service-class dynamic dot1p from CONFIGURATION mode, which applies the configuration to all interfaces. A CONFIGURATION mode service-class dynamic dot1p entry supersedes any INTERFACE entries. See Mapping dot1p values to service queues on page 576. Note: You cannot configure service-policy input and service-class dynamic dot1p on the same interface. Figure 31-3. service-class dynamic dot1p Command Example Force10#config t Force10(conf)#interface gigabitethernet 1/0 Force10(conf-if)#service-class dynamic dot1p Force10(conf-if)#end Force10# Priority-tagged Frames on the Default VLAN e c s Priority-tagged Frames on the Default VLAN is available only on platforms: x Priority-tagged frames are 802.1Q tagged frames with VLAN ID 0. For VLAN classification these packets are treated as untagged. However, the dot1p value is still honored when service-class dynamic dot1p or trust dot1p is configured. When priority-tagged frames ingress an untagged port or hybrid port the frames are classified to the default VLAN of the port, and to a queue according to their dot1p priority dot1p priority if service-class dynamic dotp or trust dot1p are configured. When priority-tagged frames ingress a tagged port, the frames are dropped because for a tagged port the default VLAN is 0. FTOS Behavior: Hybrid ports can receive untagged, tagged, and priority tagged frames. The rate metering calculation might be inaccurate for untagged ports, since an internal assumption is made that all frames are treated as tagged. Internally the ASIC adds a 4-bytes tag to received untagged frames. Though these 4-bytes are not part of the untagged frame received on the wire, they are included in the rate metering calculation resulting in metering inaccuracy. Configure Port-based Rate Policing Rate policing ingress traffic on an interface using the command rate police from INTERACE mode, as shown in Figure 31-4. If the interface is a member of a VLAN, you may specify the VLAN for which ingress packets are policed. Figure 31-4. Rate Policing Ingress Traffic Force10#config t Force10(conf)#interface gigabitethernet 1/0 Force10(conf-if)#rate police 100 40 peak 150 50 Force10(conf-if)#end Force10# Quality of Service | 563
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