C
Management Details
Chapter 4 provides information on managing the DECrepeater 90C on a
network or in a standalone configuration. This appendix provides more
information on managing a DECrepeater 90C in a DEChub 90 backplane:
•
Designating a hub manager
•
Annotating the bridge address table
•
Using the WGB address table for work group management
Designating a Hub Manager
The protocol used on the DEChub management bus allows only one
manager unit to access the management bus. When a DECbridge 90 is
first powered on or reset, it waits 60 seconds before designating itself as
the designated hub manager. This delay ensures that there is no other
manager unit in use in the hub.
During this 60-second period, you cannot manage the DECrepeater
90 units remotely. 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 message
The DECbridge 90 is not the designated hub
manager.
after the DECbridge 90 has been running for more than 60
seconds, there is something wrong.
•
If you are using two DEChub 90 units, make sure the MMJ cable is
wired correctly, and it not shorted or broken.
•
If you are using only one hub, the MMJ connector should be
disconnected.
•
Only one DECbridge 90 unit is allowed in the hub. If more than one
DECbridge 90 unit is installed, only one of them can manage the
repeaters. The other unit issues the message indicating it is not the
manager.
C–1