Am 28.03.16 um 12:12 schrieb Leon Fauster: > Am 28.03.2016 um 11:27 schrieb Götz Reinicke <goetz.reinicke at filmakademie.de>: >> We have three supermicron servers with two 10Gb Ports each, connected to a cisco switch stack 1Gb ports. All are on auto speed. >> >> I configured a LACP bond on both sides on all servers, first with citrix xen server. >> >> On one server eth0 goes down from time to time … maybe within minutes, someday it is up for some hours. >> >> Two server are fine; the bond is up for 24 days(!) now without any problem. >> >> Recently I installed centos 7.2 on that server in question and - bam - eth0 is going down from time to time … >> >> I checked patch cables, tried an other switch port channel, reconfigured the ports, reinstalled the os. Same behavior. >> >> And: We got a replacement server. Same behavior …. :) >> >> Currently the cisco tech guys don’t see a problem on the switch (which is up for 3 Years now with 10+ servers connected … no problem so far), from the citrix side I don’t get much more hints. >> >> In the logs i just have a Nic Link is Down … Nic Link is Up. It is always eth0. >> >> Question: >> >> Any idea ? One suggestion was Disable all power saving features in the server bios. Did not do that yet. >> >> Is there any chance to set some sort of higher debug level for that nic/kernel/whatever to get some server os side feedback why the port goes down? > > > How is your interface exactly configured ? TYPE=Bond #Interface type set to bond BOOTPROTO=static BONDING_MASTER=yes BONDING_OPTS="mode=4" #i set mode to active-backup DEFROUTE=yes IPADDR="192.168.xxx.xxx" NETMASK=255.255.255.0 GATEWAY="192.168.xxx.xxx" IPV4_FAILURE_FATAL=no IPV6INIT=no NAME=bond0 DEVICE=bond0 ONBOOT=yes TYPE="Ethernet" MASTER=bond0 SLAVE=yes NAME="enp4s0f0" UUID="xxx" DEVICE="enp4s0f0" ONBOOT="yes" TYPE="Ethernet" MASTER=bond0 SLAVE=yes NAME="enp4s0f0" UUID="xxx" DEVICE="enp4s0f1" ONBOOT="yes" /Götz