KB.15.15

About directing the standby module to become active

To make the standby management module become the active management module, use the

redundancy switchover command. The switch will switchover after all files have finished

synchronizing.

In nonstop switching mode:

• The switchover occurs quickly and seamlessly; no reboot is needed.

• There is no interruption in switching operations.

In warm-standby mode:

• The switchover may take several minutes if there have been recent configuration file changes

or if you have downloaded a new operating system.

• The standby module finishes booting and becomes the active module.

The formerly active module becomes the standby module if it passes selftest.

Nonstop switching with VRRP

When Nonstop VRRP is enabled, VRRP continues to operate in its current state when a failover

from the AMM to the SMM occurs. This provides an additional layer of redundancy in a switched

network. VRRP state information is maintained between MMs so that VRRP operations resume

immediately after failover from the AMM to SMM. Because of this quick resumption of operations

there is no failover to the backup VRRP router in the network. The Master VRRP router continues to

be active and operate as is.

The command for enabling Nonstop mode for VRRP must be executed in VRRP context.

Syntax

(vrrp#) [no]

nonstop

Enabling Nonstop VRRP allows the VRRP router to retain control of IP addresses when the AMM

fails over. The VRRP Backup router does not take control of the virtual IP addresses on the network.

The no version of the command disables Nonstop VRRP.

When Nonstop behavior is disabled, failure of the AMM on the VRRP Master results in the VRRP

Backup router taking control of the virtual IP addresses on the network.

The commands must be executed in VRRP context.

NOTE: Before this command is executed, the command redundancy management

nonstop-switching should be configured. Any prerequisites required for VRRP configuration

commands, such as IP routing being enabled, remain as required prerequisites.

Default: Disabled

Nonstop switching with VRRP 481