VERY weird OVM networking problem

First, this may have nothing to do with OVM, but the problem I'm seeing is happening on all FIVE of my VM servers. I can't even guess what's going on. Maybe you have seen this and solved it, or maybe you can suggest what I can do to debug this.
Here are the details:
I have a 3-node cluster, built from brand new IBM x3650 M4 servers. I have a 2-node cluster, built from old retired IBM xSeries servers that used to be VMWare ESX servers. My office is on another subnet from the data center network that contains all 5 servers. I see the following symptoms occasionally and randomly (I see it at least once a day, and can make it happen multiple times a day if I keep trying):
1. When I SSH to one of these boxes, sometimes the session will freeze. At other times, the session will work perfectly, but after exiting the SSH session, any subsequent attempt to ping or connect via TCP from my desktop to that server will absolutely fail. That is, ping, traceroute, and ssh (and presumably, everything) failes.
2. If I don't try to communicate with that server for several minutes (maybe 5 to 10 minutes, I'm not sure), and then try to ping or SSH to the box, it works again!
3. However, if after, say, exiting SSH, and finding that I can't ping the server, if I keep pinging (from Windows, I say "ping -t -w 5000 vmserver") the pings will fail FOREVER. I have left it pinging for 24 hours, and it would never answer a ping. But then if I stop the pinging, wait ten minutes, and ping again, it works. I swear.
4. During the time that I am unable to ping one of VM servers from my desktop, if I try to ping that same server from another desktop machine in my office, connected to the SAME little 4-port switch, it works perfectly.
5. This is ever more weird: During the time that my desktop 1 cannot ping server1, say, I can go go desktop 2 (right beside desktop 1), open an SSH session to server1, and from there, I can ping desktop1. I swear.
Why would I think this is an Oracle VM problem, you ask? Well, I wouldn't, except that I have other servers in that data center, that run ESX, and AIX, and Windows, and I've tried like hell to make one of them exhibit one of these symptoms, and I cannot do it.
If you have any ideas about what the heck is going on, I'd appreciate hearing them.

Doesn't sound like a VM problem to me. Sounds like you either have a spanning tree loop or you've got a lot of packet collisions causing issues.
I don't know how much you know about networking but a spanning tree loop is when you have multiple paths connected to the same physical network without using load balancing or multipathing. You can have multiple connections between physical networks but it must be configured properly or you'll have one link come up and the other go into blocking mode. you'll never know which one it might be. That is.... if the links have the same cost. Thus you get a "loop". If the ports are "floping". You'll have times when its up and times when its down. Your network admin should be able to see if the spanning tree is constantly be rewritten. That is a sure sign you have a network loop.
You said you have a 4 port switch? If that switch is set on a port that's set to do "portfast" then the switching fabric will never learn what's behind that switch. You just can't plug a switch into a network and expect it to work. Again, I don't know what you know about networking so don't take it the wrong way.
Packet collisons happen when you have a link between equipment where one side negotiates to a different speed than another. Say one side is 100 half duplex while the other end is 1000G Full duplex. You get massive amounts of collision and it will only get worse the more traffic you try to pass. Again. You mentioned a 4 port switch. You should never assume that switches will ever negotiate at the same speed on each end of the connection. Cisco has historically recommended that inter switch links be hard code to avoid 'negotiation" issues. Its not a big a difference in 1 gb siwtchiing and 10 gb switch but if you have a 100 mb 4 port switch hooked into a 1gb link..... that might be your problem. Just some thoughts.
IF you really were having a VM issues. The cluster heartbeat would be causing the VM servers to constantly reboot. So I don't think its on you servers. Probabily between you and the servers.

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