Cisco NX-OS devices introduce support for multiple virtual device contexts (VDCs)
on a single switching device. Each VDC is treated as a standalone device with
specific resources, such as physical interfaces, allocated to each VDC by the
network admin role. An administrator is assigned to each VDC and that
administrator has a limited view of the system within that specific VDC.
Faults are also isolated to within the specific VDC.
This VDC concept applies to
all features on Cisco NX-OS, including all Layer 2 switching features.
Figure 1. VDCs with Layer 2 Services. All processes work independently in each
VDC. You can reuse the process identification numbers in different VDCs. This
figure shows how to reuse the VLAN 100 identifier in each separate VDC.
Each VDC acts as a standalone
device with Layer 2 services available. VDCs allow you to share a physical
device among several logical functions. You can provision and assign entirely
separate Layer 2 resources to individual VDCs.
You can configure several
VDCs, and each VDC is a group of physical device resources. You assign
resources and user roles for each VDC. VDCs allows flexible resources as well
as enhanced fault isolation.
VDCs allow the separation of
processes and management environments, providing well-defined fault and
administrative boundaries between logical devices. Each VDC can be considered
as a separate device with its own configuration, resources, users, and
VDCs define different
administrator levels, or roles, that can access and administer each VDC.
Commands outside the scope of a given user role are either hidden from that
user’s view or can return an error if the command is entered. This feature
limits the number of users who can access the entire physical device and
introduce traffic-disrupting misconfigurations.
Cisco Nexus 7000 Series NX-OS Virtual Device Context Configuration Guide
for complete information on virtual device contexts (VDCs) and assigning
Cisco Nexus 7000 Series NX-OS High Availability and Redundancy Guide
for information on restartability and seamless transitions.