Dell Optiplex 7050's
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I had my network administrator check if the spanning tree settings are on. He verified it is on and also said it is enabled by default on all of our new switches. Regarding the client port being set to “port fast” does this need to be changed on the computer itself or the switch? Is this regarding the Spanning Tree Setting?
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Okay so I did myself a favor and moved one of the 7050’s to a different floor on a different V-Lan, and a Different Switch. This defiantly is a Network Infrastructure Issue so I am going to have to speak with my Network Administrator to see what the issue is. Is there anything I should have him specifically check? He did say Spanning Tree was already enabled. We will have to compare settings to the other floors V-Lan, and Switch Settings. Any ideas would be helpful though. Just to confirm the 7050 is registering, and imaging successfully on a different floor in my building.
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@msaglioc99 we really know to less about your network infrastructure, do you have a detailed network plan?
If your network admin is skilled enough i am sure he will see the issue. Please report if you finally solved it and tell us the solution. -
We do have a detailed Network Plan but I will report my findings when I fix the issue.
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@msaglioc99 said in Dell Optiplex 7050's:
This defiantly is a Network Infrastructure Issue so I am going to have to speak with my Network Administrator to see what the issue is.
Great you figured this out now. So the issue has actually nothing mutch to do with the Dell Optiplex 7050 machines I guess. It’s just that the switch is not properly configured. I think you need to read up on the spanning tree protocol (STP) to understand what this is about. It it used to prevent from loops in a network. For example if you connect just two switches in a loop with two cables a broadcast packet (like an ARP request) will loop between those two switches forever! To prevent from such a situation STP was invented. The switches send specially crafted packets over the network to detect such loops. In case they see such a loop as I described one of the links will be temporarily deactivated. All fine. So now let’s get back to what might be wrong with PXE boot on such switches. STP needs some time to detect the network topology and figure if there are any loops. But clients want to just go off and PXE boot too early but will fail because the switches have not gathered all the information needed yet and block the communication yet. So there is one solution to this called RSTP (rapid spanning tree protocol) which does pretty much the same but takes a lot less of the initial time. The other thing you can do if your switch does not have RSTP is to configure the client port as “port fast”. This way the port is not considered as possible loop port and traffic will be forwarded early enough for PXE booting clients.
The other thing that just came to my mind is EEE (ethernet energy efficiency). Some ethernet cards and switches support that feature to power down when there is no traffic going on. But some drivers are buggy and do not properly switch the ethernet card back to normal transfer mode.
What else? Maybe auto-negotiation? 100MB/s or 1000 MB/s? We have seen issues with NICs that don’t do proper speed auto-negotiation and will therefore fail to get up a proper connection and PXE boot.
That’s just a bunch of ideas that came to my mind. Ask your network team to see what could actually be causing this issue…
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Still looking into the issue but it seems the newer CISCO Swtiches do not work properly with the FOG Server. I am trying to still find the difference between the older switches, and the newer ones and will let you know ASAP.
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@msaglioc99 Very strange. Definitely update us, but I’m glad you at least know what the problem is.
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@msaglioc99 Figured this one out? Would be great if you could tell us what exactly caused this issue. I am sure other people will find that helpful too!
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@sebastian-roth I haven’t forgotten about you guys! My floor in our building was flooded (hot water heater broke) so I’ve had to relocate a lot of equipment. As soon as our floor is repaired I will work on this because I do need to find a fix. This issue defiantly has something to do with the newer Cisco switches though. I can get you the model if you would like. Sorry for the delay!
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@msaglioc99 Just bumping this so we don’t loose track of it…
