Configuring Loopback Interfaces for IPv6 (C-Web Interface)
Loopback interfaces are for private use only by software running on the C Series Controller, to communicate with other software also running on the same C Series Controller.
To configure a loopback interface for IPv6:
Click Configure, and expand Interfaces>Interface: lo>Unit>Family.
The Inet6 pane appears.
From the Create new list, select Address.
In the dialog box, type a name for the new address, and click OK.