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ROS™ v3.5 186 RS400
Frame
tagged ?
Received
Frame
MAC Address in
Static MAC Address
Table?
Use Port Default
CoS
To CoS
Queues of
Egress Ports
IP Frame ?
Y
Y
No
Y
No No
Use TOS
DSCP ?
Use Priority-to-
CoS Mapping
Use DSCP-to-
CoS Mapping
Use CoS
Configured for
the MAC address
No
Y
Figure 124: Determining The CoS Of A Received Frame
After inspection, the frame is the forwarded to the egress port for transmission.
7.1.2 Forwarding Phase
The inspection phase results in the CoS of individual frames being determined. When these
frames are forwarded to the egress port they are collected into one of the priority queues
according to the CoS assigned to each frame.
CoS weighting selects the degree of preferential treatment that is attached to different priority
queues. The ratio of the number of higher CoS to lower CoS frames transmitted can be
programmed. If desired, the user can program that lower CoS frames are transmitted only after
all higher CoS frames have been serviced.