Up to now we have focused on the traffic from one VM to another VM somewhere within the NSX system. I have skipped over the way traffic is distributed between hosts, and I haven’t discussed the ways that traffic can leave the NSX system. The next three posts will cover these topics.
This post will focus on the different methodologies available in NSX for dealing with BUM traffic. That is Broadcast, Unknown Unicast and Multicast traffic. This encompasses all traffic that doesn’t have a specific layer three address. In all three of these cases, the traffic is destined to touch anything up to all physical hosts in the cluster, and NSX has a few different ways of handling that traffic.