Information Technology Reference
In-Depth Information
Figure 5.63
You cannot migrate
VMs matching
your source net-
work selection if
the destination
network is listed as
inaccessible.
8.
Click Finish to start the migration of the selected VMs from the specii ed source network
to the selected destination network.
You'll see a Reconi gure Virtual Machine task spawn in the Tasks pane for each VM that
needs to be migrated.
Keep in mind that this tool can migrate VMs from a vSwitch to a distributed switch or from a
distributed switch to a vSwitch—you only need to specify the source and destination networks
accordingly.
Now that we've covered the basics of distributed switches, we'd like to delve into a few
advanced topics. First up is network monitoring using NetFlow.
Using NetFlow on vSphere Distributed Switches
NetFlow is a mechanism for efi ciently reporting IP-based trafi c information as a series of
trafi c
l ows
. Trafi c l ows are dei ned as the combination of source and destination IP address, source
and destination TCP or UDP ports, IP, and IP Type of Service (ToS). Network devices that sup-
port NetFlow will track and report information on the trafi c l ows, typically sending this infor-
mation to a NetFlow collector. Using the data collected, network administrators gain detailed
insight into the types and amount of trafi c l ows across the network.
In vSphere 5.0, VMware introduced support for NetFlow with vSphere Distributed Switches
(only on distributed switches that are version 5.0.0 or higher). This allows ESXi hosts to gather
detailed per-l ow information and report that information to a NetFlow collector.
Coni guring NetFlow is a two-step process:
1.
Coni gure the NetFlow properties on the distributed switch.
2.
Enable or disable NetFlow (the default is disabled) on a per-distributed port group basis.
Let's take a closer look at these steps.
To con i gure the NetFlow properties for a distributed switch, perform these steps:
1.
Connect to a vCenter Server instance using a supported web browser; this starts the
vSphere Web Client.
