Dell Force10 MXL Blade MXL 10/40GbE Switch IO Module Configuration Guide - Page 421
Priority-Tagged Frames on the Default VLAN, Con Port-based Rate Policing
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On the MXL Switch, 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. For more information, refer to Mapping dot1p Values to Service Queues. Note: You cannot configure service-policy input and service-class dynamic dot1p on the same interface. Figure 24-3. service-class dynamic dot1p Command Example FTOS#config t FTOS(conf)#interface tengigabitethernet 1/0 FTOS(conf-if)#service-class dynamic dot1p FTOS(conf-if)#end FTOS# Priority-Tagged Frames on the Default VLAN 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 you configure service-class dynamic dot1p or trust dot1p. 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 if you configure service-class dynamic dotp or trust dot1p. 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 may be inaccurate for untagged ports because 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 To configure rate policing ingress traffic on an interface, use the rate police command from INTERACE mode (Figure 24-4). If the interface is a member of a VLAN, you may specify the VLAN for which ingress packets are policed. Figure 24-4. Rate Policing Ingress Traffic FTOS#config t FTOS(conf)#interface tengigabitethernet 1/0 FTOS(conf-if)#rate police 100 40 peak 150 50 FTOS(conf-if)#end FTOS# Quality of Service (QoS) | 419
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