Posts Tagged ‘diff-serv’


In this post we will look at the basic classification and marking features available in the 3550 and 3560 switches. Basic features include packet marking using port-level settings and port-level policy-maps. Discussing Per-VLAN classification is outside the scope of this document.

The Catalyst QoS implementation bases on Differentiated Services model. In a few words, the ideas of this model could be outlined as follows:

1) Edge nodes classify ingress packets based on local policy and QoS label found in packets.
2) Edge nodes encode traffic classes using a special field (label) in packets to inform other nodes of the classification decision.
3) Core and edge nodes allocate resources and provide services based on the packet class.

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