OcNOS-SP : Quality of Service Guide : Quality of Service Configuration Guide : Quality of Service : Packet QoS Attributes
Packet QoS Attributes
Every data packet is assigned a set of QoS attributes that can be modified in several stages of the ingress pipeline engine.
The ingress pipeline engine also contains a QoS Remark option for L3 traffic that can modify the initial QoS attributes of the packet.
Color and Drop Precedence relation: Green has the lowest drop precedence, Yellow has a higher drop precedence, and Red has the highest drop precedence. See Table 1-1.
 
Table 1-1: Packet QoS attributes
QoS Parameter
Description
TC (Traffic Class or queue)
This is the priority level assigned to the packet. When the transmission engine queries the packet, it uses this field to select the appropriate priority queue
DP (Drop Precedence or color)
The transmission engine uses this field for congestion resolution. Packets with higher drop precedence are more likely to be discarded in the event of congestion. By default, packets with red color will be dropped by a Qumran even if there is no congestion. Disabling red packet drop is configurable per device.
In case of L2 packet, DEI 0 will be marked to color green and DEI 1 will be marked to color yellow. In case of L3 packet, AFx1 will be marked as green while both AFx2 and AFx3 will be marked as yellow (where x=1,2,3).
Last modified date: 06/07/2023