Configuring Port Scheduler Policies
Page 462
7950 XRS Quality of Service Guide
service level scheduler is a scheduler instance at the SAP, multi-service site
or
profile level)
operate based on packet overhead which does not include the IFG or preamble on Ethernet
packets. In order for the port based virtual scheduling algorithm to function, it must convert the
queue and service scheduler packet based required bandwidth and bandwidth limiters (CIR and
rate PIR) to frame based values. This is accomplished by adding 20 bytes to each Ethernet frame
offered at the queue level to calculate a frame based offered load. Then the algorithm calculates
the ratio increase between the packet based offered load and the frame based offered load and uses
this ratio to adapt the CIR and rate PIR values for the queue to frame-CIR and frame-PIR values.
When a service level scheduler hierarchy is between the queues and the port based schedulers, the
ratio between the average frame-offered-load and the average packet-offered-load is used to adapt
the scheduler’s packet based CIR and rate PIR to frame based values. The frame based values are
then used to distribute the port based bandwidth down to the queue level.
Summary of Contents for 7950
Page 12: ...Page 12 7950 XRS Quality of Service Guide List of Figures ...
Page 16: ...Preface Page 16 7950 XRS Quality of Service Guide ...
Page 82: ...Editing QoS Policies Page 82 7950 XRS Quality of Service Guide ...
Page 90: ...Applying Network Queue Policies Page 90 7950 XRS Quality of Service Guide ...
Page 96: ...Editing QoS Policies Page 96 7950 XRS Quality of Service Guide ...
Page 98: ...Command Hierarchies Page 98 7950 XRS Quality of Service Guide ...
Page 108: ...Command Hierarchies Page 108 7950 XRS Quality of Service Guide ...
Page 156: ...Basic Configurations Page 156 7950 XRS Quality of Service Guide exit exit ...
Page 164: ...Queue Depth Monitoring Page 164 7950 XRS Quality of Service Guide ...
Page 304: ...Service Queue QoS Policy Commands Page 304 7950 XRS Quality of Service Guide ...
Page 368: ...Command Hierarchies Page 368 7950 XRS Quality of Service Guide ...
Page 430: ...Configuration Commands Page 430 7950 XRS Quality of Service Guide ...
Page 532: ...Editing QoS Policies Page 532 7950 XRS Quality of Service Guide ...
Page 552: ...Editing Advanced Policies Page 552 7950 XRS Quality of Service Guide ...
Page 600: ...Command Hierarchies Page 600 7950 XRS Quality of Service Guide ...
Page 602: ...QoS Commands Page 602 7950 XRS Quality of Service Guide ...
Page 610: ...Standards and Protocols Page 610 7950 XRS Quality of Service Guide ...
Page 612: ... 2015 Alcatel Lucent All rights reserved 3HE 09868 AAAA TQZZA 01 ...