Technical Note: How to configure a secondary IPv6 address on an interface

[jrosado_FTNT]

Description

This article explains how to configure a secondary IPv6 on an interface.  There is no option available to do this from the GUI.   

Solution

The following steps can be used to configure a secondary IPv6 address on an interface.

1.) Enable the secondary IP option

This may be done either via the GUI at System > Interfaces > 'Interface name' or the via CLI:

    config system interface
        edit <interface>
        set secondary-IP enable
    end

2.) Configure the secondary IP via CLI:

    config system interface
        edit <interface>
            config ipv6
            config ip6-extra-addr
                edit <IP/Prefix>
            end
        end
    end