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Limitations of command 'unset nsrp link-up-on-backup' in Transparent mode



Article ID: KB7937 KB Last Updated: 30 Jan 2009Version: 4.0

Pair of active/passive firewalls in transparent mode are flip-flopping between master and slave.


Pair of active/passive firewalls in transparent mode are flip-flopping between master and slave.  The command 'unset nsrp link-up-on-backup' is specified in the NSRP configuration. 

When 'unset nsrp link-up-on-backup' is specified, the interface is in the Down state, and if the interface is being monitored, the state of the NSRP will change, which can end up with a NSRP flap.


If your firewall is configured in Transparent mode, and if the NSRP command 'unset nsrp link-up-on-backup' is set, then the following commands will not work as expected.  It is not supported, per-design.

set nsrp vsd-group id <id> preempt
set nsrp vsd-group master-always-exist
set nsrp monitor interface
set nsrp monitor zone
set nsrp monitor track-ip

Note:  If the default setting 'set nsrp link-up-on-backup' is used, then the above commands are supported on a firewall in Transparent mode.
This article applies to ScreenOS 5.3.0 and above.

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