8 RELEASE NOTE INFORMATION
Redundant Configuration
When resetting Device A, the primary IP addresses (for both Device A &
Device B), the subnet mask and the default router settings are preserved.
The device redundancy setting is set to none and Device B synchronizes to
this configuration setting. When Device B discovers that it is no longer
part of a redundant configuration, all of the settings are reset to factory
defaults including the primary IP address, subnet mask and default router.
In redundant configurations, resetting Device B’s configuration is not
recommended as Device A is unaffected and Device B becomes
unreachable due to the loss of its primary IP address.
Clock Settings When Device A is configured, it does not pass the configuration for set
clock to Device B. You must set the clock on Device B using the CLI.
Redundant
Configuration
Issues
The following are known issues that pertain to the Server Load Balancer
and the Server Load Balancer Plus when configuration for redundancy.
The Server Load Balancer and Server Load Balancer Plus support the
following redundant configurations:
■ Active-Passive
■ Active-Active
Virtual Router
Redundancy Protocol
Priority Generation
The Server Load Balancer and Server Load Balancer Plus use the Virtual
Router Redundancy Protocol (VRRP) to determine which devices should
be in Active or Standby modes.
The message log, as shown below, for the Server Load Balancer and
Server Load Balancer Plus contains entries that dynamically describe the
state and operation of the redundant configurations.
2001-01-01 12:00:00 INFO <Ext.Prot.Vrrp> VRID 1: Priority: 40 Changing to Priority: 41
The dynamic update of the priority field is an indication of the process
that the Server Load Balancer and Server Load Balancer Plus continuously
performs to determine its overall network connectivity. In comparing this
priority field with its peer’s, the unit with the greatest network
connectivity value is deemed the Active device.
