Switchover Mechanisms; Ha Switchover Characteristics; Initiating A Switchover - Cisco AP775A - Nexus Converged Network Switch 5010 Configuration Manual

Switchover Mechanisms

S e n d d o c u m e n t a t i o n c o m m e n t s t o m d s f e e d b a c k - d o c @ c i s c o . c o m
Note
Switchover Mechanisms
Switchovers occur by one of the following two mechanisms:
•
•
Once a switchover process has started another switchover process cannot be started on the same switch
until a stable standby supervisor module is available.
Caution If the standby supervisor module is not in a stable state (ha-standby), a switchover is not performed.

HA Switchover Characteristics

An HA switchover has the following characteristics:
•
•
•

Initiating a Switchover

To manually initiate a switchover from an active supervisor module to a standby supervisor module, reset
the active supervisor module using Device Manager. Once the switchover process has started, another
switchover process cannot be started on the same switch until a stable standby supervisor module is
available.
To perform a switchover using Device Manager, follow these steps:
Step 1 Ensure that an HA switchover is possible by selecting Physical > Modules to verify the presence of
multiple modules.
You see the screen shown in
Cisco MDS 9000 Family Fabric Manager Configuration Guide
17-2
both supervisor modules come up at the same time, sup-1 becomes active. The standby supervisor
module constantly monitors the active supervisor module. If the active supervisor module fails, the
standby supervisor module takes over without any impact to user traffic.
For high availability, you need to connect the ethernet port for both active and standby
supervisors to the same network or virtual LAN. The active supervisor owns the one IP address
used by these ethernet connections. On a switchover, the newly activated supervisor takes over
this IP address.
The active supervisor module fails and the standby supervisor module automatically takes over.
You manually initiate a switchover from an active supervisor module to a standby supervisor
module.
It is stateful (nondisruptive) because control traffic is not impacted.
It does not disrupt data traffic because the switching modules are not impacted.
Switching modules are not reset.
Figure 17-1.
Chapter 17 Configuring High Availability
OL-17256-03, Cisco MDS NX-OS Release 4.x