I have an ESXi 5.1 server with just one virtual switch for management network, iSCSI traffic vs storage and VM connectivity.
Both physical NICs of this server are connected to Cisco switch on access ports.
I noticed on my switch several messages like this:
%SW_MATM-4-MACFLAP_NOTIF: Host xxxx in vlan 100 is flapping between port Gi0/9 and port Gi0/10
%SW_MATM-4-MACFLAP_NOTIF: Host xxxx in vlan 100 is flapping between port Gi0/10 and port Gi0/9
I checked this URL:
but I am not using neither Etherchannel nor Network failover detection with Beacon probing.
On virtual switch (ESXi) traffic shaping is configured with "Route based on source MAC hash", with both interfaces in Active, so I wouldn't expect flapping since VM's mac address are static.
How can I avoid flapping?
I think I could simply put one network interface in standby mode.. but I'd need to check how much traffic is on that link.