When you upgrade your VMware environment to version 5.5. remember to upgrade your distributed vSwitch as well; it will not be done automatically. In this way, you can utilize new features in dvSwitch 5.5, including:
The upgrade process is fairly easy and the good thing is that according to VMware documentation, it is non-disruptive which means there is no outage and no host and VM will get down or experience issues. Find your distributed vSwitch either in vSphere Client or Web client, right click and do upgrade.
Following my last post about administration and monitoring tasks in VMware 5, I will talk about another promising feature of VMware vSphere 5.x: supporting NetFlow. NetFlow is a network protocol developed by Cisco for collecting IP traffic information. NetFlow has become an industry standard for traffic monitoring.
As I wrote earlier, cloud/network engineers would like to have the same capabilities in virtualization as they have in physical networks and nowadays NetFlow is turning out to be the new trend in producing networking devices such as switches. In the same way switches support NetFlow, VMware implemented NetFlow that can be enabled on vSwitches, specifically very useful in Distributed switches. Good to mention that from version 5.1 VMware also supports newer version of NetFlow which is IPFIX. You can find more information about NetFlow by itself on the internet.
Configuring NetFlow in VMware vSphere is a 2 step process:
- Configure NetFlow properties on the dvSwitch.
– Port is a UDP port which NetFlow collector will listen on. In NFDUMP, it is 23456! by default.
– Of course, IP session between dvSwitch and NetFlow collector should be established in a proper way. I mean dvSwitch should see NetFlow collector.
- Enable NetFlow on the specific dvPort group.
That’s it. In the next post, I will show how you can use a free, simple NetFlow Analyzer (nfdump, nfsen) to gather and display information about IP traffic flows in your dvSwitch.