Information About Single and Dual Supervisor Roles
The Cisco Nexus 1000V can be configured with a single Virtual Supervisor Module (VSM) or dual VSMs. The following table describes the HA supervisor roles for single and dual VSM operation.
Single VSM Operation |
Dual VSM Operation |
---|---|
|
|
HA Supervisor Roles
The redundancy role indicates not only whether the VSM interacts with other VSMs, but also the module number it occupies. The following table shows the available HA roles for VSMs.
role |
Module Number |
Description |
---|---|---|
Standalone |
1 |
|
Primary |
1 |
|
Secondary |
2 |
|
Dual Supervisor Active and Standby Redundancy States
Independent of its role, the redundancy state of a VSM can be one of the following described in this table.
Redundancy State |
Description |
---|---|
Active |
Controls the system and is visible to the outside world. |
Standby |
Synchronizes its configuration with that of the active VSM so that it is continuously ready to take over in case of a failure or manual switchover. You cannot use Telnet or Secure Shell (SSH) protocols to communicate with the standby VSM. Instead, you can use the attach module command from the active VSM to access the standby VSM console. Only a subset of the CLI commands are available from the standby VSM console. |
Dual Supervisor Synchronization
The active and standby VSMs are in the operationally HA state and can automatically synchronize when the internal state of one supervisor module is Active with HA Standby and the internal state of the other supervisor module is HA Standby.
If the output of the show system redundancy command indicates that the operational redundancy mode of the active VSM is None, the active and standby VSMs are not yet synchronized.
This example shows the VSM internal state of dual supervisors as observed in the output of the show system redundancy status command:
switch# show system redundancy status
Redundancy role
---------------
administrative: standalone
operational: standalone
Redundancy mode
---------------
administrative: HA
operational: None
This supervisor (sup-1)
-----------------------
Redundancy state: Active
Supervisor state: Active
Internal state: Active with no standby
Other supervisor (sup-2)
------------------------
Redundancy state: Not present
switch#