Recently we encountered an interesting issue. A particular VM in the cloud be a unpingable sometimes. When the network guy tried to ping this VM from the cloud border routers, there would be no reply from one of the router. Yet on the other router there is no issue. So we had to figure out what happened to the ping packets in the cloud. Read the rest of this entry »
Tag Archives: NSX
So what does NSX cross vCenter failover look like in a real world scenario?
In this setup, we have 2 NSX managers across two sites, with Site A hosting the primary and DR Site hosting the secondary NSX manager. Simulating a DR scenario, the primary NSX manager, all 3 controllers and all the universal DLR control-VMs are shutdown in Site A
Well studying for my NSX 6.2 exams, I found that there were some confusing over dead time value and polling interval for NSX edge HA. While doing my NSX class I asked my instructor about it and he clarified the following:
In NSX Edge HA configuration (as of 6.3) :-
- Default Declare dead time is 15 seconds
- The minimum acceptable value 9 seconds, anything below 9 seconds will not work
- The polling interval is 1 seconds
You can see the polling interval by running “debug packet” commands in the edge.
How does the dead time value impact connectivity? As a quick test, I have a machine pinging another machine behind the Edge HA.
Dead time = 15 seconds –> 11 ping time out
Dead time = 9 seconds –> 4 pings time out