Cabletron Systems TRMM-4, User Manual

Page: 57 / 74

INTRODUCTION TO MULTIPLE-RING MMAC FUNCTIONALITY
A-5
A.4.2 Auxiliary Rings
Each port switching MIM has two auxiliary rings. These rings never
communicate with FNB rings, unless through an external device such as a
switch or router. A station on an auxiliary ring can only communicate
with stations attached to the same MIM and assigned to the same
auxiliary ring. Auxiliary rings are useful to provide a dedicated ring for
the transfer of large amounts of data, as occurs when “backing up”
servers.
A.4.3 Bypassed Rings
A management module can bypass (prevent communication among) any
port switching MIM from any or all of the FNB rings. Any station
connected to a bypassed ring will not communicate with FNB rings
(it can however communicate with other stations on that bypassed ring).
For example, stations attached to Ring 2 on a bypassed MIM will not
communicate with stations on MIMs inserted into FNB Ring 2.
A.5 A SAMPLE CONFIGURATION
The purpose of the port switching family of MIMs is to segment traffic
and provide the advantages described in
Section A.1 . As an example
configuration, Figure A-4 shows an MMAC configured with multiple
rings. The users of each ring typically share a server. One of these user
groups is attached to a MAU that is connected to a TRXMIM port that has
been configured as a RO port. The switch provides the communication
among rings.