<div dir="ltr">Do you have "spanning-tree portfast" enabled on your switch ports? The syntax will depend on switch vendor, but the principal is the same. When the nic comes up there can be a significant delay while STP decides whether to pass packets or not, which can wreak havoc on things that expect the network to Just Work(tm). portfast tells the switch to assume a client, not another switch is on the port.<div><br></div><div>jbh</div></div><br><div class="gmail_quote"><div dir="ltr">On Sun, Mar 12, 2017 at 1:02 PM Jon Tegner <<a href="mailto:tegner@renget.se">tegner@renget.se</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi,<br class="gmail_msg">
<br class="gmail_msg">
I'm booting some nodes disk less, using root file system on NFS. The<br class="gmail_msg">
first phase (PXE, tftp etc) works without problems. The second phase,<br class="gmail_msg">
when the system is actually supposed to boot over NFS the machine hangs<br class="gmail_msg">
about every second time - and it seems to be a result of the relevant<br class="gmail_msg">
nic (eth0) not negotiating its properties before some kind of timeout<br class="gmail_msg">
kicks in. Obviously resulting in a failure to boot the NFS file system.<br class="gmail_msg">
If I reboot the node it eventually works.<br class="gmail_msg">
<br class="gmail_msg">
This could possibly be a problem with the switch, but one remedy would<br class="gmail_msg">
seem to be to extend the time before the timeout kicks in (it seems to<br class="gmail_msg">
be a few seconds at the moment). Any hints on how to achieve this?<br class="gmail_msg">
<br class="gmail_msg">
Thanks,<br class="gmail_msg">
<br class="gmail_msg">
/jon<br class="gmail_msg">
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</blockquote></div><div dir="ltr">-- <br></div><div data-smartmail="gmail_signature"><div dir="ltr"><div>‘[A] talent for following the ways of yesterday, is not sufficient to improve the world of today.’</div><div> - King Wu-Ling, ruler of the Zhao state in northern China, 307 BC</div></div></div>