Operation Manual – QoS-QoS Profile
H3C S5600 Series Ethernet Switches
Chapter 1 QoS Configuration
1-10
1.3.4 Priority Marking
The priority marking function is to reassign priority for the traffic matching an ACL
referenced for traffic classification.
z
If 802.1p priority marking is configured, the traffic will be mapped to the local
precedence corresponding to the re-marked 802.1p priority and assigned to the
output queue corresponding to the local precedence.
z
If local precedence marking is configured, the traffic will be assigned to the output
queue corresponding to the re-marked local precedence.
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If IP precedence or DSCP marking is configured, the traffic will be marked with
new IP precedence or DSCP precedence.
1.3.5 Traffic Policing
The network will be made more congested by plenty of continuous burst packets if the
traffic of each user is not limited. The traffic of each user must be limited in order to
make better use of the limited network resources and provide better service for more
users. For example, traffic can be limited to get only its committed resources during a
time period to avoid network congestion caused by excessive bursts.
Traffic policing is a kind of traffic control policy used to limit the traffic and the resource
occupied by supervising the traffic. The regulation policy is implemented according to
the evaluation result on the premise of knowing whether the traffic exceeds the
specification when traffic policing is performed. Normally, token bucket is used for traffic
evaluation.
I. Token bucket
The token bucket can be considered as a container with a certain capacity to hold
tokens. The system puts tokens into the bucket at the set rate. When the token bucket
is full, the extra tokens will overflow and the number of tokens in the bucket stops
increasing.
