High Availability For Vlans; Virtualization Support For Vlans; Licensing Requirements For Vlans; Prerequisites For Configuring Vlans - Cisco Nexus 7000 Series Configuration Manual

High Availability for VLANs

When you delete a specified VLAN, the ports associated to that VLAN become inactive and no traffic flows.
When you delete a specified VLAN from a trunk port, only that VLAN is shut down and traffic continues to
flow on all the other VLANs through the trunk port.
However, the system retains all the VLAN-to-port mapping for that VLAN, and when you reenable or re-create,
that specified VLAN, the system automatically reinstates all the original ports to that VLAN. The static MAC
addresses and aging time for that VLAN are not restored when the VLAN is reenabled.
High Availability for VLANs
The software supports high availability for both stateful and stateless restarts, as during a cold reboot, for
VLANs. For the stateful restarts, the software supports a maximum of three retries. If you try more than 3
times within 10 seconds of a restart, the software reloads the supervisor module.
You can upgrade or downgrade the software seamlessly when you use VLANs.

Virtualization Support for VLANs

The software supports virtual device contexts (VDCs), and VLAN configuration and operation are local to
the VDC.
When you create a new VDC, the device automatically creates a new default VLAN, VLAN1, and internally
reserves VLANs for device use.
One or more VLANs can be associated with a role to either allow or disallow the user to configure it. When
a VLAN is associated with a role, the corresponding interfaces will also be subjected to the same check. For
instance, if a role is allowed to access VLAN1, that role also has access to the interfaces that have that VLAN.
If an interface does not have the VLAN associated with a role, that interface is not accessible to that role.

Licensing Requirements for VLANs

The following table shows the licensing requirements for this feature.
Product
Cisco NX-OS
However, using VDCs requires an Advanced Services license.

Prerequisites for Configuring VLANs

VLANs have the following prerequisites:
Cisco Nexus 7000 Series NX-OS Layer 2 Switching Configuration Guide, Release 5.x
26
License Requirement
VLANs require no license. Any feature not included
in a license package is bundled with the Cisco NX-OS
system images and is provided at no extra charge to
you. For a complete explanation of the Cisco NX-OS
licensing scheme, see the Cisco NX-OS Licensing
Guide.
Configuring VLANs