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Assured rate
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Bandwidth guaranteed until the node below in the scheduler hierarchy is oversubscribed.
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Best effort
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Network forwards as many packets as possible in as reasonable a time as possible. This is the default per-hop behavior (PHB) for packet transmission.
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Best-effort queue
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For a logical interface, the queue associated with the best-effort traffic class for that logical interface,
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Best-effort scheduler node
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The scheduler node associated with a logical interface and traffic class group pair, and where the traffic class group contains the best-effort traffic class. Also known as best-effort node.
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CDV
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Cell delay variation. Measures the difference between a cell's expected and actual transfer delay. Determines the amount of jitter.
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CDVT
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Cell delay variation tolerance. Specifies the acceptable tolerance of CDV (jitter).
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Effective weight
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The result of a weight or an assured rate. Users configure the scheduler node by specifying either an assured rate or a weight within a scheduler profile. An assured rate, in bits per second, is translated into a weight. The resultant weight is referred to as an effective weight.
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Group node
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A scheduler node associated with a {port interface, traffic-class group} pair. Because the logical interface is the port, only one such scheduler node can exist for each traffic-class group above the port. This node aggregates all traffic for traffic classes in the group.
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HAR
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Hierarchical assured rate. Dynamically adjusts bandwidth for scheduler nodes.
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HRR
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Hierarchical round-robin. Allocates bandwidth to queues in proportion to their weights.
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Latency
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Delay in the transmission of a packet through a network from beginning to end.
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Proprietary QoS Management Information Base (MIB)
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Supported on the E-series router.
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Queue
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First-in-first-out (FIFO) set of buffers that control packets on the data path.
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QoS port-type profile
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Supplies the QoS information for forwarding interfaces stacked above ports of the associated interface type.
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QoS profile attachment
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Applies the rules in the QoS profile to a specific interface.
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Rate shaping
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Allows you to throttle a queue to a specified rate.
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RED
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Random early detection congestion avoidance technique.
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Scheduler hierarchy
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A hierarchical, tree-like arrangement of scheduler nodes and queues. The router supports up to three levels of scheduler nodes stacked above a port. The port scheduler is at level 0, with two levels of scheduler nodes at levels 1 and 2. A final level of queues is stacked above the nodes.
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Scheduler node
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An element within the hierarchical scheduler that implements bandwidth controls for a group of queues. Queues are stacked above scheduler nodes in a hierarchy. The root node is associated with a channel or physical port.
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Shaping rate
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Bandwidth in a queue or node can be throttled to a specified rate.
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Shared shaper constituent
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All nodes and queues that are associated with a logical interface that is being shared shaped are considered potential constituents of the shared shaper.
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Weight
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Specifies the relative weight for queues in the traffic class.
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WRED
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Weighted random early detection congestion avoidance technique.
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