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How Traffic Prioritization Works
49
You cannot alter the mapping of the priorities. These are fixed to the
traffic types as shown in Figure 11
.
Figure 11
IEEE 802.1D traffic types
Figure 11 illustrates IEEE 802.1D traffic types as well as associated priority
levels and how they are mapped to the two supported traffic queues.
The 802.1D service level of the packet is not altered by the Switch 4200.
DiffServ traffic
classification
DiffServ is an alternative method of classifying traffic so that different
levels of service can be applied to it on a network. DiffServ is a layer 3
function; and the service to be applied is contained within the DSCP field,
which is in the IP header of a packet.
802.1p
Service levels
Classification
802.1D
Low Priority Queue
Egress Port
Best effort
Background
Spare
Business Critical
Multimedia
Video
Voice
Network Control 7
6
5
4
3
2
1
0
High Priority Queue
Ingress Port
Strict Priority
Queue Scheduling