High Availability For Vlans - Cisco Nexus 9000 Series Configuration Manual

Configuring VLANs
Newly created VLANs remain unused until Layer 2 ports are assigned to the specific VLAN. All the ports
are assigned to VLAN1 by default.
Depending on the range of the VLAN, you can configure the following parameters for VLANs (except the
default VLAN):
• VLAN name
• VLAN state
• Shutdown or not shutdown
You can configure VLAN long-names of up to 128 characters. To configure VLAN long-names, VTP must
be in transparent mode.
Note See the Cisco Nexus 9000 Series NX-OS Interfaces Configuration Guide for information on configuring
ports as VLAN access or trunk ports and assigning ports to 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.
Commands entered in the VLAN configuration submode are not immediately executed. You must exit
Note
the VLAN configuration submode for configuration changes to take effect.

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.
See the Cisco Nexus 9000 Series NX-OS High Availability and Redundancy Guide, for complete information
Note
on high availability features.
Licensing Requirements for VLANs
The following table shows the licensing requirements for this feature.
Cisco Nexus 9000 Series NX-OS Layer 2 Switching Configuration Guide, Release 7.x
High Availability for VLANs
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