Operation Manual – QoS
H3C S3610&S5510 Series Ethernet Switches
Chapter 2 Traffic Classification, TP, and TS
Configuration
2-7
traffic of a certain connection is excess, TP can choose to drop the packets or to reset
the priority of the packets.
TP is widely used in policing the traffic into the network of internet service providers
(ISPs). TP can classify the policed traffic and perform pre-defined policing actions
based on different evaluation results. These actions include:
z
Forwarding conforming packets or non-conforming packets.
z
Dropping conforming or non-conforming packets.
z
Marking a conforming packet with a new 802.1p precedence value and forwarding
the packet.
z
Marking a conforming packet with a new IP precedence value and forwarding the
packet.
z
Marking a conforming packet or a non-conforming packet with a new DSCP
precedence value and forwarding the packet.
2.3.5 TS
TS is a policy used to adjust the rate of outbound traffic actively. A typical TS
implementation is to control outbound traffic according to the traffic control settings of
the downstream network nodes.
The difference between TP and TS lies in that when traffic exceeds the set threshold,
TP drops packets and TS caches packets or add packets to queues, as shown in
. Cached packets are sent at an even rate only when there are enough tokens in the
token bucket. Another difference between the two is that TS results in additional delay
and TP seldom does.
Token
bucket
Drop
Packet
classification
Packets to be sent
through this port
Continue
to send
Put tokens in the bucket at the
set rate
Queue
Figure 2-5
Diagram for TS
For example, assume that Switch A sends packets to Switch B. Switch B performs TP
for packets from Switch A. Packets exceeding the set threshold are simply dropped.
