Cabletron Systems Ethernet Hubs manual Setting Redundant Circuits

Hub Redundancy Management

Setting Redundant Circuits

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.

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.

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.

Configuration Views	Cabletron Ethernet Hubs
4-24	Management Module Guide