The servers in our datacentre (variously Dell PER710, PE2950 and HP DL380G5) are configured with 2 NICs bonded in an active-backup configuration (mode=active-backup miimon=100). The networking team have been complaining that they causing 'port flapping' on their Cisco switches, so we have been comparing the switch and server logs to see whether we can detect a pattern. In each instance that we have found so far, when the flapping occurs /var/log/messages has a warning about the lp driver:

Code:
Oct 22 09:03:56 <hostname> kernel: lp: driver loaded but no devices found
We have various OS versions, but in the instance here it's SLES10SP3 (and OES2SP3):

Code:
# cat /etc/*release
SUSE Linux Enterprise Server 10 (x86_64)
VERSION = 10
PATCHLEVEL = 3
LSB_VERSION="core-2.0-noarch:core-3.0-noarch:core-2.0-x86_64:core-3.0-x86_64"
Novell Open Enterprise Server 2.0.3 (x86_64)
VERSION = 2.0.3
PATCHLEVEL = 3
BUILD
We don't believe in coincidences but this really seems very strange indeed. Can anyone offer any insight as to what is going on here?