HP 6125XLG R2306-HP 6125XLG Blade Switch ACL and QoS Configuration Guide - Page 42

GTS, GTS application

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• Forwarding the packet with its precedence re-marked if the evaluation result is "conforming." Priorities that can be re-marked include 802.1p priority, DSCP precedence, and local precedence. GTS GTS supports shaping the outbound traffic. GTS limits the outbound traffic rate by buffering exceeding traffic. You can use GTS to adapt the traffic output rate on a device to the input traffic rate of its connected device to avoid packet loss. The differences between traffic policing and GTS are as follows: • Packets to be dropped with traffic policing are retained in a buffer or queue with GTS, as shown in Figure 8. When enough tokens are in the token bucket, the buffered packets are sent at an even rate. • GTS can result in additional delay and traffic policing does not. Figure 8 GTS For example, in Figure 9, Device B performs traffic policing on packets from Device A and drops packets exceeding the limit. To avoid packet loss, you can perform GTS on the outgoing interface of Device A so that packets exceeding the limit are cached in Device A. Once resources are released, GTS takes out the cached packets and sends them out. Figure 9 GTS application Device A Device B Physical link 36

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36
•
Forwarding the packet with its precedence re-marked if the evaluation result is "conforming."
Priorities that can be re-marked include 802.1p priority, DSCP precedence, and local precedence.
GTS
GTS supports shaping the outbound traffic. GTS limits the outbound traffic rate by buffering exceeding
traffic. You can use GTS to adapt the traffic output rate on a device to the input traffic rate of its connected
device to avoid packet loss.
The differences between traffic policing and GTS are as follows:
•
Packets to be dropped with traffic policing are retained in a buffer or queue with GTS, as shown
in
Figure 8
. When enough tokens are in the token bucket, the buffered packets are sent at an even
rate.
•
GTS can result in additional delay and traffic policing does not.
Figure 8
GTS
For example, in
Figure 9
, Device B performs traffic policing on packets from Device A and drops packets
exceeding the limit. To avoid packet loss, you can perform GTS on the outgoing interface of Device A so
that packets exceeding the limit are cached in Device A. Once resources are released, GTS takes out the
cached packets and sends them out.
Figure 9
GTS application
Device A
Device B
Physical link