Overview; Applications - Alcatel-Lucent 7210 SAS E OS Quality Of Service Manual

Overview

Overview
Egress port rate limiting allows the device to limit the traffic that egresses through a port to a value
less than the available link bandwidth. This feature is supported on the 7210 SAS-Series
platforms.

Applications

This feature is useful when connecting the 7210 SAS to an Ethernet-over-SDH (EoSDH) (or
microwave) network, where the network allocates predetermined bandwidth to the nodes
connecting into it, based on the transport bandwidth requirement. When connecting to such a
network it is important that the traffic sent into the SDH node does not exceed the configured
values, since the SDH network does not have QoS capabilities and buffers required to prioritize
the ingress traffic.
Egress rate attributes include:
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Allows for per port configuration of the maximum egress port rate, using the egress-rate
CLI command.
Ethernet ports configured as access and access uplink support this feature.
The port scheduler distributes the available maximum egress bandwidth based on the CIR/
PIR configuration parameters provisioned for the queues.
Provides support for a burst parameter to control the amount of burst the egress port can
generate.
When ports are members of a LAG, all the ports use the same value for the egress-rate and
the max-burst parameters.
If frame overhead accounting is enabled, then queue scheduler accounts for the Ethernet
frame overhead.
7210 SAS-E OS Quality of Service Guide