Reference Guide

FTOS(conf-if)#switchport
FTOS(conf-if)#dot1p-priority 1
FTOS(conf-if)#end
FTOS#
Honoring dot1p Priorities on Ingress Traffic
By default, FTOS does not honor dot1p priorities on ingress traffic.
You can configure this feature on physical interfaces and port-channels, but you cannot configure it on individual
interfaces in a port channel.
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.
• Honor dot1p priorities on ingress traffic.
INTERFACE mode
service-class dynamic dot1p
Example of Configuring an Interface to Honor dot1p Priorities on Ingress Traffic
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
Priority-tagged frames on the default VLAN is available on the S4820T platform.
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
might 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.
Configuring Port-Based Rate Policing
If the interface is a member of a VLAN, you may specify the VLAN for which ingress packets are policed.
• Rate policing ingress traffic on an interface.
INTERFACE mode
rate police
Example of the rate police Command
FTOS#config t
FTOS(conf)#interface gigabitethernet 1/0
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