User`s guide

118 XgOS User’s Guide • September 2014
In this example, only the default VLAN (VLAN 1) is present. As a result, no isolation
exists, and all hosts (s1, s2, s3, and s4) can see each other on the network. This
scenario might not be preferable in situations where you want some hosts to be
isolated from others. You can use VLANs to accomplish the isolation. Consider the
example in the following figure.
In this figure, VLANs are configured. Packets that are tagged with unique VLAN IDs
are transmitted and received on specific vNICs to support communication between
specified servers. For example, the packets that are supported on vNICs in VLAN 5
will be transmitted and received on interfaces that support VLAN 5. As a result,
only hosts s1 and s2 know about each other, and traffic to and from those hosts is
kept isolated from hosts s3 and s4 in VLAN 10. Servers s3 and s4 know only about
each other and traffic for hosts s3 and s4 is also kept isolated from traffic related to
VLAN 5.
Configuration Overview and Guidelines
Configuring VLANs requires setting VLAN properties on an Ethernet port and on
any vNICs terminating on that port. The names and definitions of VLAN properties
for an Ethernet port and a vNIC are identical, except for the tag-native property
which is applicable to Ethernet ports only. For information about the tag-native
property, see “Tag Native” on page 121.