Hi

I have a simple setup in my office on which I doing some bonding testing and have run into a small problem

I have an HP server with a onboard broacom network card and an pci intel network card.

This uses bnx2(broadcom) and e1000 (intel) drivers.

The bonding settings are:

mode=active-backup

miimon=5

primary=eth0

eth0 is plugged into a Cisco 2950 called A

eth2 is plugged into a separate Cisco 2950 called B

Both switches are connected to one another on port 24.

There is a laptop plugged into switch A or B, results are the same.

I then do the following test:

ping the server continuosly

Shutdown eth0 on the switch

The bond fails perfectly to eth2.

Wait for one minute

Enable eth0 again.

Watching /proc/net/bonding/bond0 this shows that it immediately  makes eth0 active again.

However immediately upon doing that the ping starts to fail for about 30 seconds and then after 30 seconds starts working again.

When I shutdown eth0 I see a arp reply packet on eth2 followed by multiple arp who-has packets

When I bring eth0 up again I see a arp reply packet on eth0

I have no idea why this failure is happening… is this a switch config problem or a bondig problem…

Regards