26
DarkStar User Guide
3: Software
www.xkl.com
The
app
command sets up and configures APP groups. To create a new APP group, give the
app
command two
arguments:
1.
The working interface.
2.
The protection interface.
The following example illustrates how to create an APP group, with wave west 0 as the working interface and wave
east 0 as the protection interface:
localhost>
enable
localhost#
configure
localhost CONF#
app wave west 0 wave east 0
localhost CONF#
exit
localhost#
write memory
Are you sure? [yes/no]
yes
localhost#
If the working interface experiences intermittent connection problems, a revertive APP group may rapidly switch back and
forth between working and protection interfaces, which can cause data loss or seriously degrade network performance. In
such a case, it may be useful to set a holdoff value, which specifies the time duration before an APP group reverts from the
working to the protection interface. Holdoff time is specified in milliseconds.
The following example illustrates how to set a holdoff value for an APP group, in this case with a value of 1 minute
(60000 milliseconds):
localhost>
enable
localhost#
configure
localhost CONF#
app revertive wave west 0 holdoff 60000
localhost CONF#
exit
localhost#
write memory
Are you sure? [yes/no]
yes
localhost#
To following example illustrates how to set an APP group to be non-revertive:
localhost>
enable
localhost#
configure
localhost CONF#
no app revertive wave west 0
localhost CONF#
exit
localhost#
write memory
Are you sure? [yes/no]
yes
localhost#
An APP group may be locked to prevent switching. Locking an APP group is helpful during physical maintenance of interfaces
in the APP group, as it can prevent an interruption in network traffic.
