| Title: | DEChub/HUBwatch/PROBEwatch CONFERENCE |
| Notice: | Firmware -2, Doc -3, Power -4, HW kits -5, firm load -6&7 |
| Moderator: | NETCAD::COLELLA DT |
| Created: | Wed Nov 13 1991 |
| Last Modified: | Fri Jun 06 1997 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 4455 |
| Total number of notes: | 16761 |
Hi,
I'm looking for some details on the hub900 configuration:
A customer is concerned that having assigned a DECrepeater900 to
his chosen backplane channels through Hubwatch, he loses this config
when the module is removed from the hub and then replaced.
I find that the config is saved if the whole hub is powerd down
and back up and so is safe from power outages. So where is the config
saved? I guess its stored in the MAM and only rewritten to the modules
at certain times such as when the MAM powers up?
Can anyone give me the low-down?
thanks,
John Reynolds, UK CSC, Comms.
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 1186.1 | MAM remembers config, modules don't remember.... | NACAD2::BATTERSBY | Wed Jul 06 1994 13:01 | 13 | |
The modules don't know anything about which slot it's plugged
into a HUB. The MAM saves configs and what module was plugged
into a particular location. That's why the config is restored
when a HUB is powered off and then on again. when a module is
removed from the HUB, the MAM will disconnect what it was
connecved to and the operator will have to re-configure this
module if it is re-inserted in the same slot or another slot
in the same HUB.
There have been other notes in here explaining this process and
the why of this feature.
Bob
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| 1186.2 | LEVERS::SLAWRENCE | Mon Jul 11 1994 14:03 | 23 | ||
Backplane configuration info is stored _only_ in the nvram of the MAM.
The module will be configured by the MAM whenever it needs it,
including:
o When the configuration is first set up
o When the hub powers up
o When the module resets (for any reason, including console, remote
hubwatch reset, or bugcheck)
The MAM constantly polls the backplane status of all modules capable of
LAN hopping and will update it whenever it is needed.
The MAM can physically detect when a module is disconnected (the
locking latch is lifted), and it deletes the backplane configuration
for the slot when it sees that happen. Note that it cannot detect this
if it is itself not powered up, so swapping a module for an identical
one when the hub is powered down will not change the backplane
configuration.
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