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Internal packet queuing
Correspondence between the priorities of the standard protocols and the internal prioritiesuseused by the InfiLINK 2x2 and InfiMAN 2x2 families of devices
Correspondence table between the priorities of the standard protocols and the internal priorities used by the InfiLINK XG, InfiLINK XG 1000, Quanta 5 and Quanta 70 families of devices
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Prioritization assumes the use of several packet queues, whose content must be transmitted to the outgoing interfaces through a common bus. Infinet devices support two mechanisms for packets packet transmission from the queues to the bus: strict and weighted scheduling.
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The weighted scheduling doesn't have the disadvantages of the strict scheduling. Weighted scheduling assumes the allocation of the resources between for all the queues according to the weighting factors that correspond to the priority values. If there are three queues (Figure 15), weighted factors can be distributed in the following way:
- packets packet queue 1: weight = 3;
- packets packet queue 2: weight = 2;
- packets packet queue 3: weight = 1.
When using the weighted scheduling, each queue will receive resources, i.e. there will be no such situation with complete inaccessibility of a network service.
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- Pay special attention when developing the QoS policies. The policy should take into account the traffic of all the services used in the network and it should provide strict compliance between the service and the traffic class.
- The QoS policy should take into account the technical capabilities of the devices for recognizing and manipulating handling the service field values, which indicate the data priority.
- The rules for traffic flow classification must be configured on the border devices of the DS domain.
- The intermediate intermediate devices of the DS domain should automatically recognize the traffic priorities.
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