Hub Redundancy Management
Setting Redundant Circuits
Configuration Views Cabletron Ethernet Hubs
4-24 Management Module Guide
when you were sending direct deposit payroll information from the Payroll
Department to the Accounting Department the night before payday. This
could be a disastrous situation.
Redundant circuit management would prevent this situation by allowing the
primary hub device to automatically switch from the primary circuit to the
secondary circuit. The backup circuit would become active and continue
sending data over its cable connection. Redundancy becomes especially
important for unattended night time batch jobs, or for jobs where a
communications problem could seriously interfere with normal business
operations.
Setting Redundant Circuits
The following procedure uses an IRM2 hub device as an example. However,
this procedure can also be used with MRXI and MiniMMAC hubs as primary
devices. The secondary device can be any hub device with redundancy
capability (e.g., MRXI, MiniMMAC, IRM2, IRM3). This procedure may also be
used to configure multiple secondary hub devices.
To set redundant circuits for the devices modeled in SPECTRUM, follow these
steps:
1. Click on the icon to select it.
2. If contact has been established and the icon is green, bring up the
Configuration View.
3. From the Configuration View menu, click on the Redundancy button. In
the Redundancy View window, click on Redundancy Table.
NOTE
These instructions assume that you have a primary MMAC hub module port
physically attached to a secondary MMAC hub module port. Both these
modules must have redundant circuit capability. The backup port connection
cannot be completed until you have set up the active connection in
SPECTRUM. For convenience, you should also prepare a list of secondary hub
Ethernet addresses before beginning this procedure.
Also, SNMP devices require the use of the Community Name attribute. The
SPECTRUM default of “public” grants read-only privileges, which allow you
to view device attributes, but not modify them. Since setting up redundancy
requires modifying the device attributes, you should set the Community Name
to “ctron,” which grants read/write privileges. You can set the Community
Name when you create the device or change it in the Device Configuration
View.