| T.R | Title | User | Personal
Name | Date | Lines |
|---|
| 1039.1 | Yes but...??? | CGOS01::DMARLOWE | Have you been HUBbed lately? | Mon May 30 1994 01:29 | 9 |
| You can put 4 DECconcentrator 900's in a hub. I'm not sure if you
can put both A and B ports into the backplane and connect all of
them together. I have 2 DECbridge 900's in a single hub but can
only put either an A or a B port into the backplane, but not both.
The worst that could happen is that you may have to use a few external
MIC-MIC patch cables.
dave
|
| 1039.2 | | KAOFS::S_HYNDMAN | Acronym Decoder Ring Architect | Mon May 30 1994 10:17 | 7 |
|
Yes you can. Check note 651 for connection specifics. You can
only chain them for the first release.
Scott
|
| 1039.3 | | UFP::LARUE | Jeff LaRue: U.S. Network Resource Center | Fri Jun 03 1994 13:24 | 26 |
|
I have upgraded all of the firmware in the DEChub 900 modules
(including the MAM) and am now able to access and set the "ligo" blocks
in the concentrator.......I seem to have the ability to choose the
option for both A and B ports to be connected through the backplane.
The notes that Karl P. entered (#651) indicates that for the March FCS,
it will not be possible to have a dual ring completely contained in the
hub backplane. Is this still the case? It is not easy to tell if this
is or is not happening by looking at Hubwatch.
Back at the January Network Academy, we were told that it would be
necessary to manually configure the connections between A and B ports
when building FDDI backbones in the hub backplane.....but I only see a
single "tail" coming out of the concentrator......never two?
When I take four concentrators and put them on the same FDDI channel,
as shown in the LAN Interconnect window, all of the stations connected
to the concentrators can communicate......so do I actually have an
unwrapped dual ring backbone?
One last thing! The release notes state that one should not (ever?)
remove a concentrator from a powered-down hub. Can I ask why?
-tnx,
Jeff
|
| 1039.4 | Ask? Sure. Answer? That'll cost ya. :-) | ROGER::GAUDET | Because the Earth is 2/3 water | Fri Jun 03 1994 16:03 | 19 |
| Jeff,
>> One last thing! The release notes state that one should not (ever?)
>> remove a concentrator from a powered-down hub. Can I ask why?
Of course you can ask. However, answers are extra. :-)
The short answer is that if you made some backplane connections from other
modules to a concentrator (or bridge) through the HUBwatch LAN Interconnect
window, then power down the hub and remove the module, when hub power is
restored the hub manager cannot yet deal with how to resolve the connections
which no longer exist to the now-removed module (i.e. the matrix is still
programmed as if the concentrator were still in its slot). Known problem,
that's why it's in the release notes.
That's the answer I got from the hub manager gurus. Don't shoot, I'm only the
messenger.
...Roger...
|
| 1039.5 | | UFP::LARUE | Jeff LaRue: U.S. Network Resource Center | Mon Jun 06 1994 22:25 | 5 |
|
...understood...I'll make sure we don't rip out a concentrator from
a down hub!!
-tnx!
|
| 1039.6 | Some Additional Answers | LEVERS::CORTES | | Tue Jun 07 1994 16:43 | 43 |
| I'll try to answer the rest of the questions for Jeff:
>The notes that Karl P. entered (#651) indicates that for the March FCS,
>it will not be possible to have a dual ring completely contained in the
>hub backplane. Is this still the case? It is not easy to tell if this
>is or is not happening by looking at Hubwatch.
If you have MAM V3.0 and Wiring Concentrator V2.0, you can have a
completely contained ring in the hub backplane. All you need is for
all your four concentrators to be configured Trunk AB, and connected
to the same FDDI ring. The LAN Interconnect window, however,
does not tell you exactly what is going on. You need to see the
configuration window for each concentrator to be able to tell exactly
what is going on (see below).
>Back at the January Network Academy, we were told that it would be
>necessary to manually configure the connections between A and B ports
>when building FDDI backbones in the hub backplane.....but I only see a
>single "tail" coming out of the concentrator......never two?
The LAN Interconnect window shows only one single tail regardless of
the "Ligo" (building block) type that you have configured your
concentrator to. If you go to the configuration window of each
concentrator you will see which way they have been configured. The
possibilities so far are Trunk A (port A out the back, B out the front),
Trunk B (port B out the back B out the front), Trunk AB (both A and
B out the back) or Stump (both A and B out the front). Root and Non-Root
will be available in the future.
>When I take four concentrators and put them on the same FDDI channel,
>as shown in the LAN Interconnect window, all of the stations connected
>to the concentrators can communicate......so do I actually have an
>unwrapped dual ring backbone?
If the four concentrators are configured Trunk AB, then you do
actually have an unwrapped dual ring backbone.
Hope this helps,
Eladio
|
| 1039.7 | | UFP::LARUE | Jeff LaRue: U.S. Network Resource Center | Wed Jun 08 1994 16:58 | 7 |
|
...okay, that makes sense. I found the "ligo" blocks and was making
the changes per concentrator...but wasn't sure about the "mssing"
tails.
-tnx,
Jeff
|