B
Management Details
This appendix supplements the management information in Chapter 4; it
provides the following information for managing a DECrepeater 90FA in a
DEChub backplane:
•
Designating a hub manager
•
Annotating the bridge address table
•
Using the work group bridge address table for work group management
Designating a Hub Manager
The protocol used on the DEChub management bus allows for only a single
manager unit to access the management bus. When a DECbridge 90 series unit
is first powered up or reset, the bridge waits 60 seconds before it is established as
the designated hub manager. This delay ensures that there is no other manager
unit in use in the hub.
During the 60 seconds, you cannot remotely manage the DECrepeater 90FA. This
restriction does not apply to the repeaters themselves. A repeater inserted into
the hub is immediately manageable by whatever unit is currently the designated
hub manager.
If you receive the following message after a DECbridge unit has been running for
60 seconds, then there is something wrong.
The DECbridge unit is not the designated hub manager.
When this message appears, check the following:
•
If you are using two hubs, be sure that the BNE16 or DECconnet office cable
is wired correctly, and that it is not shorted or broken.
•
If you are using only one hub, the MMJ connector should be disconnected.
Only one DECbridge unit is allowed in the hub. If more than one is inserted, only
one is able to manage the repeaters. The other unit issues the message.
Management Details B–1
