| � 1. Where can I find a basic tutorial for FDDI concepts?
Notes> dir /title=book
Topic Author Date Repl Title
> 1283 NYOS01::AMMU 21-MAR-1994 7 FDDI HANDBOOK by Raj Jain?
End of requested listing
� 2. What is the course part number/s for GIGAswitch/FDDI/DEChub/switch?
Search (yes, search) the Gigaswitch notes conference. To find a notes
conference try this:
$ search anchor""::net$library:easynotes.lis gigaswitch
GIGAswitch SCHOOL::GIGASWITCH 4181
In a mature notes conference the question "How do I learn?" most likely
has been asked and answered several times.
� 3. If I want to self train, Where is the best place to start?
� 4. In the above config, the FGL-2 is connected to the 900-EF with two
� sets of FDDI cables. I need to know what is a dual ring? and what is
� Dual homing?
See #1.
� 5. In the above config, it appears that IP is fine but decnet OSI is
� not functioning. If you power down the FGL-2 module which is connected
� to the 900-EF and then power it on ,the Learned table for the mac
� addresses for DECnet is correct and logging into nodes thru the
� Gigaswitch finctions. but after 3 or four minutes the table "changes"
� and the mac adress for a port on the FGL-4 changes to the port on the
� FGL-2 going to the 900-ef!!!
See #2.
� Where do I start...maybe by understanding FDDI concepts will help me
� most.
FDDI is straightforward but not simple. See the "Table of Contents" reply
in note 1283 to get some ideas of what you need to know.
Regards,
Chuck
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| P.S. You've left out most of the useful information, like the rest of
the network topology, but if I were to hazard a guess, I'd guess that
you have one of the following things wrong:
1) Loop in the topology
2) Multiple systems assigned the same DECnet Phase IV address
(duplicate MAC address)
3) Multiple interfaces on the same system assigned the same DECnet
Phase IV compatible address
Bridges learn addresses on certain ports because either someone
told them the address lived on that port or because they saw a frame
originate from that port. If the GIGAswitch/FDDI system thinks the MAC
address lives on the FGL-2 port, then it's probably seeing frames
coming from that direction.
For 1), unless you've disabled spanning tree, it's pretty unlikely that
there's a loop.
You can see if 2) is happening by disconnecting the DECnet/OSI system,
and waiting to see if the address ages out after the normal aging
interval (2 minutes by default). If it doesn't age out, then you have
someone else using the same Phase IV compatible address.
If you don't have multiple adapters, then 3) isn't happening. If you
do have multiple adapters, then disconnect one of them from the
network. Don't try to disable it - physically remove the cable
completely from the network. Wait for normal aging to happen - see if
DECnet/OSI works afterward.
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