User`s manual

DT-6X60 User's Manual - Platform (Build 2.0)
6.9.2.2 O PERATIONAL C ONFIGURATION – STBYUPD CFG
The assignment of application types to instances, i.e. the app command, can only be performed on
the active system console. After using app to change configuration on the active, the standby
can have its configuration updated by entering stbyupd cfg on the standby console. This will also
update the standby with all current application configuration associated with the instances on the
active DT-6X60.
6.9.3 AUTOMATIC STANDBY CONFIGURATION UPDATE – STBY CFG
The redundant pair of DT-6X60's can be configured to perform a periodic automatic update of
configuration from the active to the standby. This is the most convenient way to propagate
configuration changes from the active system console and from the instances running on the
active into the standby DT-6X60.
Syntax: stby cfg SCAN=<minutes> AGE=<minutes> DELAY=<0-20>
The update period (SCAN and AGE) is configurable by the user at the active system console. The
DELAY value is configured by the user at the active console for the active, and can also be
configured at the standby console for the standby. However, the standby must be rebooted in
order for the DELAY value to become effective immediately. Otherwise, the values on the standby
are copied from the active after the AGE period has elapsed.
The SCAN period determines how often the standby polls the active, and the AGE value
determines how old files must be before they will be automatically copied to the standby. Thus
when the active fails and switches over, any configuration changes that were made in the last
"AGE" minutes will not be present on the standby. If the values for these parameters are not set,
then they default to 5 minutes.
In a duplex DT-6x60 configuration, the DELAY parameter adds extra delay in the detection and
switchover processes of approximately 6 seconds for each increment of DELAY. The default is
DELAY=0. DELAY=none or DELAY=0 uses the same parameters as previous implementations.
Setting this parameter is only recommended for network connections where an Ethernet switch
between the active and standby introduces a long delay before active and standby can
communicate with one another. To date, these switches include certain models of Cisco Ethernet
switches. The customer must set up the configuration and test it before beginning live production
as the delay required varies depending on the model of switch used. It is impossible for Datatek or
Tollgrade to try all models that a customer may chose to use. Switchover problems have not been
experienced to date when Ethernet switches from other manufacturers are used or when plain
hubs are used.
On the active system console, the vfy stby or stby vfy command displays the current status of
the standby DT-6X60 and the configured values for SCAN, AGE, and DELAY.
As part of automatic configuration update, when the standby detects that a new application has
been configured, but the software for that application is not resident on the standby, it copies the
software from the active, provided that application has been properly installed on the active. This
is the only case where software is automatically updated on the standby. Otherwise, the
procedures given in section 6.9.2.1 above must be performed in order to insure that the version of
the application software used for a particular application is the same on the standby as it is on the
active DT-6X60. Either way, registration of the application on the standby still needs to be done
manually.
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The SCAN procedure requires quite a bit of overhead on the active DT-6X60, so it is
recommended to make the SCAN period as long as the user's requirements will tolerate (e.g. 60
minutes). The AGE delay prevents potentially fault-inducing configuration changes from