You can configure more than one CSD device on a network such that one (the backup device) will back up another (the main device). In this case, a failure of any network interface on the main CSD will fail the whole device, and the backup device, previously idle, will take over all activity.

To enable the backup device:

1. From the CSD menu, point at Redundancy and choose Global Redundancy Configuration.
   The Global Redundancy Configuration window opens.
2. In the Global Redundancy Configuration window, ensure that that IP Redundancy Admin Status is enabled.
3. Ensure that Interface Grouping is disabled.
4. If your network is set up as a VLAN, ensure that VLAN Redundancy Device Mode is set to Backup.
5. Click .
   Your changes are made.
6. Configure IP Router Redundancy.