3Com 10014299 manual Configuring shaping parameters for a specified flow

Traffic Shaping 675

Figure 215 Schematic diagram of GTS processing

Tokens enter bucket at the given speed

incoming packets

classify

Token Bucket

outgoing packets

queue

Discarded

packets

If an interface does not use the rule defined by rule to classify the packet, the interface has only one queue. If GTS uses the rule defined by rule to classify the packet, it maintains a separate queue for every type of flow. In every interface, GTS can select either of the following two methods:

■Processing all the flows of the interface: At this time, if the sending queue of this interface is empty, and the traffic of the packets in unit time does not exceed the limitation, the packet is sent immediately, otherwise, the packet enters the sending buffered queue of the interface.

■Processing different flows of the interface: Different flows are compared with acl-number. When they are matched with the rule and the interface sending queue is empty, and the traffic of the packet in unit time does not exceed the limitation, the packet is sent immediately, otherwise, the packet enters the sending buffered queue of the interface.

To reduce the unnecessary loss of the packet, GTS processing is performed on the packet in the upstream router egress, and the packet that exceeds the GTS traffic characteristics are buffered on the interface buffer. When the network congestion is removed, GTS again takes out the packet from the buffer queue and continues to send. Thus, the packets sent to the downstream router will all conform to the traffic specification of the router to reduce the drop of the packet in the downstream router. If GTS processing is not performed in the upstream router egress, all the packets that exceed the CAR specified traffic of the downstream router would be dropped by the downstream router.

Configuring GTS Traffic shaping configuration includes:

■Configuring shaping parameters for a specified flow

■Configuring shaping parameters for all flows

Configuring shaping parameters for a specified flow

Shaping a special kind of flow means shaping merely the flows that match the rules.

Please perform the following settings in the interface view.