A private VLAN allows two companies connected to Internet Exchange (IX) to share private routes which are not advertised publicly on IX. You can request a private dot1q VLAN to create an isolated broadcast domain over IX that can be used for direct bi-lateral peering or to create a community of interest. See Ports for more information.
This video explains the features and configuration of private VLANS on IX.
For more videos on Internet Exchange, see the IX Videos page.