HP Cisco MDS 9216i Cisco MDS 9000 Family Fabric Manager Configuration Guide - - Page 376

Switchover Mechanisms Chapter 17 Configuring High Availability Send documentation comments to [email protected] 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. Note 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. Switchover Mechanisms Switchovers occur by one of the following two mechanisms: • 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. 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: • 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. 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 Figure 17-1. 17-2 Cisco MDS 9000 Family Fabric Manager Configuration Guide OL-17256-03, Cisco MDS NX-OS Release 4.x