Hi, i support a small Failover Cluster two node setup of Server 2012 R2 which has an iscsi SAN for storage and a teamed 10Gb link dedicated to guest vm network access. Recently we have noticed the following:
A live migration of a guest vm from one host to the other results in:
Loss of network connection TO the guest vm from anywhere (either host, other vms, outside real physical pc etc)
Network connectivity FROM the guest vm however is ok (so the guest retains internet access, dns lookups, can ping other devices
After 10 minutes full network access to the guest vm returns
Things i have noted:
MAC address of guest vm seems to stay the sameRunning a wireshark indicates that there are two GARP's announced at the point where connectivity ceases
Wireshark shows icmp requests from the guest vm to other devices (so we are actually pinging the devices we think we are pinging).
The 10Gb network link is via a cisco sg500x stack of 4 switches, the MAC addrss table refresh on this appears to be 300 secs.
Has anybody seen anyhting like this before ?
Thanks
Roger