Can't make LOM working more than 20 seconds after startup

Hi.
This bottle in the sea because I don't succeed to make LOM working.
The story is the following.
I have 5 Xserve Intel involved in a Xsan installation. Port 1 is used for public LAN, port 2 for private LAN, as usual.
I've configured the LOM settings for port 1 locally with Server Monitor with another IP in the public LAN.
Then I've added the Xserve in the Server Monitor of an iMac used for the administration of the SAN.
The messages I get are a waiting for an answer of the Xserve or the fact that the information have not been updated... for a long time. All the Xserve present the same problem. At this moment, it's not possible to ping the LOM Port 1.
If I add the server locally in its own Server Monitor with its LOM IP, it doesn't work either but if I try "127.0.0.1", I get the hardware informations as expected.
I've tried to shutdown a Xserve, unplug the power cords, wait one minute, plug the power cords, start it but it doesn't fix the problem. Perhaps I should have unplug the other cables ?
Finally, I've noticed that :
- when the Xserve is shut down, I can ping the LOM Port 1
- during the start up of the Xserve, the iMac gets its hardware informations for a couple of seconds
- at the moment when the login window is visible in ARD, the LOM Port 1 is no longer ping-able
- the Server Monitor on the iMac says that the connection with the Xserve has been lost.
That is to say that the iMac receives the hardware informations of the Xserve during 20 seconds after their startup, not more
I've tried to use the command sudo IPMITool lan print 1 and it seems that the configuration is correct.
I have also another problem with Server Monitor. If I try locally (with the 127.0.0.1 address) to edit notifications, I don't succeed to complete the "To" field whereas I can comlete the "From" field. Is there a known problem with the GUI here or do I have to change my glasses ?
Any idea is welcome now ! I'm lost.
All the best.

Hi.
I've investigated the problem. It's simple but I 've found no solution at the moment.
The problem appears when the Xserve is connected to the Cisco Catalyst 3750G switch, can't be reproduced when the Xserve is in direct attachement with my Mac.
All the ports of this switch have been set to "Desktop" with the Web interface (after Express Setup) and the negociation (speed/duplex) is auto by default.
When the Ethernet negociation setting on the Xserve is "Automatic", the Xserve doesn't fully boot. When it is started, you have to unplug and plug the Ethernet cable so the startup is completed. Very strange.
When the Ethernet negociation setting on the Xserve is manually fixed to 1000-FD, the Xserve starts up without problem. When the Xserve is stopped, the LOM Port in pingable. When it starts a little, the LOM Port is still pingable but at the moment I think the manual setting is applied, the LOM Port is no longer pingable. This is the key of the problem.
So I tried to fix the speed/duplex in the switch and leave the Xserve on "Automatic". The story is the same: the LOM Port is desactivated after a few seconds of startup.
When the Xserve is on "Automatic" and plugged directly to my Mac, the problem doesn't exist.
The problem does not exist with the Mac Pro leaved on "Automatic".
So the problem is between the Xserve Intel and the Cisco Switch. Perhaps something to do with its settings but I do not speak "Cisco" regularly
The Cisco has product ID WS-C3750G-48TS and the Software is 12.2(25)SEE3.
I made the same test with the "private" Cisco switch product ID WS-C3750G-24T and the problem is the same.
For the moment, I leave the Xserve with the speed/duplex fixed because I prefer that the machines boot, rather than being able to consult LOM remotely when they are hanged (it works locally on 127.0.0.1 on each Xserve started).
Next step would be to play with setting the spanning tree "portfast" on the Cisco ; if it lets the Xserve to be set on "Automatic", perhaps it will solve the LOM problem and by the way the edit notification problem.
All the best !

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