UCS B200M3, 3750G Switch connectivity oddness

[Chris Hibbert]

Morning All,

Hoping someone can help, I have a strange situation that occurs with my new UCS installation.

Configuration is:

UCS Chassis connected to a pair of 6248UP Fabric Interconnects, using 2208XP IO Modules.

I connect from this to a distribution 3750 stack, I have configured 2 etherchannels on the 3750 stack, and on the UCS Manager, these are configured to pass all the relevant VLAN's, I have three blades (B200M3) installed into the chassis with VMWare ESXI 5 installed.

Once they have all been set up they can communicate both ways to and from the network without problem, both the vmware networks and the LAN.

Overnight (without any changes) 2 of the blades (slots 2 and 3) stop communicating to the network. I can get them working again by making a few changes to the network settings and all will be ok until the next day.

I am at a loss as to what can be causing this.

Any help would be great.

Thanks

Chris

[Robert Burns]

Thanks for the update Chris.  Let me know how it goes with the vCenter & HA heartbeats keeping your mgmt connections up.

Robert

[Chris Hibbert]

Thanks for your time Robert - apologies it took a while to come back to you been rushed off my feet last few days.

The issue was related to the lack of chatter from the management interfaces and therefopre the MAC address aging off the MAC table.

I tested this by only adding 2 of the 3 servers to the cluster, they naturally got chatty and didn't drop.

Many Thanks for your help

Chris

[Robert Burns]

Appreciate the follow up Chris.  Glad everything is working as expected. 

Let us know if you have any further issues.

Cheers,

Robert