Dell Force10 E600i FTOS Version 8.4.1.5 Configuration Guide for ExaScale - Page 799
Honor dot1p Priorities on Ingress Traffic, Priority-tagged Frames on the Default VLAN
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Honor dot1p Priorities on Ingress Traffic FTOS Behavior: - Honoring dot1p priorities is supported only on physical port and port-channel interfaces; it is not supported on VLAN interfaces. - By default FTOS does not honor dot1p priorities on ingress traffic. Use the command service-class dynamic dot1p from INTERFACE mode to honor dot1p priorities on ingress traffic, as shown in the output example below. You can configure this feature on physical interfaces and port-channels, but you cannot configure it on individual interfaces in a port channel. 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. Refer to Mapping dot1p values to service queues. Note: You cannot configure service-policy input and service-class dynamic dot1p on the same interface. FTOS#config t FTOS(conf)#interface gigabitethernet 1/0 FTOS(conf-if)#service-class dynamic dot1p FTOS(conf-if)#end FTOS# 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 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. Quality of Service | 799
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