HP 6125G HP 6125G & 6125G/XG Blade Switches ACL and QoS Configuration - Page 40

Traffic shaping, Line rate,

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Traffic shaping IMPORTANT: Traffic shaping shapes the outbound traffic. Traffic shaping limits the outbound traffic rate by buffering exceeding traffic. You can use traffic shaping to adapt the traffic output rate on a device to the input traffic rate of its connected device to avoid packet loss. The difference between traffic policing and GTS is that packets to be dropped with traffic policing are retained in a buffer or queue with GTS, as shown in Figure 10. When enough tokens are in the token bucket, the buffered packets are sent at an even rate. Traffic shaping can result in additional delay and traffic policing does not. Figure 10 GTS For example, in Figure 11, Device B performs traffic policing on packets from Device A and drops packets exceeding the limit. To avoid packet loss, you can perform traffic shaping on the outgoing interface of Device A so packets exceeding the limit are cached in Device A. Once resources are released, traffic shaping takes out the cached packets and sends them out. Figure 11 GTS application Device A Device B Physical link Line rate Line rate supports rate-limiting the inbound traffic and the outbound traffic. 34

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34
Traffic shaping
IMPORTANT:
Traffic shaping shapes the outbound traffic.
Traffic shaping limits the outbound traffic rate by buffering exceeding traffic. You can use traffic shaping
to adapt the traffic output rate on a device to the input traffic rate of its connected device to avoid packet
loss.
The difference between traffic policing and GTS is that packets to be dropped with traffic policing are
retained in a buffer or queue with GTS, as shown in
Figure 10
. When enough tokens are in the token
bucket, the buffered packets are sent at an even rate. Traffic shaping can result in additional delay and
traffic policing does not.
Figure 10
GTS
For example, in
Figure 11
, Device B performs traffic policing on packets from Device A and drops packets
exceeding the limit. To avoid packet loss, you can perform traffic shaping on the outgoing interface of
Device A so packets exceeding the limit are cached in Device A. Once resources are released, traffic
shaping takes out the cached packets and sends them out.
Figure 11
GTS application
Line rate
Line rate supports rate-limiting the inbound traffic and the outbound traffic.
Device A
Device B
Physical link