Introduction
•Conforms to the IETF DiffServ model
—Provides differentiated classes of service on outbound traffic by performing traffic conditioning actions. Important traffic classes can take bandwidth away from less important classes, up to
❏Classification occurs when traffic classes are defined in filters.
❏Marking occurs when marking attributes are set in policies.
❏Metering occurs when bandwidth is reserved for defined traffic classes in policies.
—Allows DSCP and VLAN marking on outbound traffic from the
❏Can assign different DSCP network routing priorities (valid range
❏Can assigned different VLAN priorities (valid range
IMPORTANT Conformance of
•Supports traffic classification on broad range of packet attributes
•Provides provisioned QoS management
With provisioned QoS, network resources are statically configured in anticipation of traffic that will flow through them. Most QoS mechanisms in network devices and computing systems use provisioned QoS; for example, priority queues, rate controls, and packet marking. With signaled QoS, applications or the operating system dynamically signal network devices in an attempt to reserve resources on them.
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