Alcatel-Lucent 7210 SAS M Service Guide

Services
7210 SAS M Services Guide Page 53
Figure 9: 0-4 G.8032 Sub-Ring
Sub-Rings and Major Rings run similar state machines for the ring logic, however there are some
differences. When Sub-Rings protect a link, the flush messages are propagated to the major ring.
(A special configuration allows control of this option on the 7210 SAS.) When major rings change
topology, the flush is propagated around the major ring and does not continue to any sub-rings.
The reason for this is that Major Rings are completely connected but Sub-Rings are dependent on
another ring or network for full connectivity. The topology changes need to be propagated to the
other ring or network usually. Sub-Rings offer the same capabilities as major rings in terms of
control and data so that all link resource may be utilized.
Major Ring
Sub Ring
Sub Ring
PBB BCB Function
PBB BEB Function
QinQ Switch
RPL
CE CE CE CE CE CE
MC-LAG
Sub Ring
Major RingMajor Ring Major Ring
OSSG532

Alcatel-Lucent 7210 SAS M Specifications

General

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