Information Technology Reference
In-Depth Information
Figure 3.3
CMT Cores, Threads, and Caches
Guests have one or more virtual network devices connected to virtual Layer 2
network switches provided by service domains. Virtual network devices can be on
the same or different virtual switches so as to connect a domain to multiple net-
works, provide increased availability using IPMP (IP Multipathing), or increase
the bandwidth available to a guest domain.
From the guest perspective, virtual network interfaces are named
vnet
N
,
where
N
is an integer starting from 0 for the first virtual network device defined
for a domain. In fact, the simplest way to determine if an Oracle Solaris instance
is running in a guest domain (specifically, a domain that is not an I/O domain) is
to issue the command
ifconfig -a
and see if the network interfaces are
vnet0
,
vnet1
, and so on, rather than real devices like
nxge0
or
e1000g0
. Virtual network
devices can be assigned static IP or dynamic IP addresses, just as with physical
network devices.
3.3.2.1 MAC Addresses
Every virtual network device has its own MAC address. This is different from
Oracle Solaris Containers, where a single MAC address is usually shared by
all Containers in a Solaris instance. MAC addresses can be assigned manually
or automatically from the reserved address range of
00:14:4F:F8:00:00
to
00:14:4F:FF:FF:FF
. The bottom half of the address range is used for automatic
assignments; the other 256K addresses can be used for manual assignment.
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