Posts Tagged ‘dscp’

Oct
30

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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