[CentOS] bonding interface instable

Hi all,

i recently found that some frontend servers (Centos6) show:

kernel: bonding: bond0: link status definitely up for interface eth2.
kernel: bonding: bond0: link status definitely down for interface eth2, disabling it
kernel: bonding: bond0: link status definitely up for interface eth2.

On some days frequently and on others none.

But there is no hw failure or similar. 


$ cat /sys/devices/virtual/net/bond0/bonding/{mode,arp_validate}
active-backup 1
active 1


$ cat /etc/sysconfig/network-scripts/ifcfg-bond0
DEVICE=bond0
BOOTPROTO=static
IPADDR=MYIP
NETMASK=MYMASK
NETWORK=MYNET
BROADCAST=MYCAST
ONBOOT=yes
TYPE=Ethernet
BONDING_OPTS="mode=1 arp_interval=500 arp_validate=1 arp_ip_target=GATEIP,GATE2IP primary=eth0"





$ cat /proc/net/bonding/bond0
Ethernet Channel Bonding Driver: v3.6.0 (September 26, 2009)

Bonding Mode: fault-tolerance (active-backup)
Primary Slave: eth0 (primary_reselect always)
Currently Active Slave: eth0
MII Status: up
MII Polling Interval (ms): 0
Up Delay (ms): 0
Down Delay (ms): 0
ARP Polling Interval (ms): 500
ARP IP target/s (n.n.n.n form): GATEIP, GATE2IP

Slave Interface: eth0
MII Status: up
Speed: 1000 Mbps
Duplex: full
Link Failure Count: 31
Permanent HW addr: MACADDR
Slave queue ID: 0

Slave Interface: eth2
MII Status: up
Speed: 1000 Mbps
Duplex: full
Link Failure Count: 1
Permanent HW addr: MACADDR
Slave queue ID: 0


Device module tg3:
$ cat /sys/module/tg3/version
3.124


Any ideas or same experiences out there?

Thanks

LF