Alcatel-Lucent 7210 SAS Series User Manual

Overview
Page 96 7210 SAS D, E, K OS Quality of Service Guide
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:
• 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.
• The 7210 SAS-D and 7210 SAS-E, provides support for a burst parameter to control the
amount of burst the egress port can generate. On 7210 SAS-K the burst parameter is not
user configurable and set to a default by software.
• 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.

Alcatel-Lucent 7210 SAS Series Specifications

General

Brand	Alcatel-Lucent
Model	7210 SAS Series
Category	Switch
Language	English