There is no Peering constraint at N-IX. For the public space, a minimal AUP (acceptable use policy) is designed. In principle each member can choose their own partner and so act flexibly. Of course, to maximize the use of the Platform, offer as much as possible in Peering.
It is also possible for ISPs to buy, or sell, over the Transit-/Backup-bandwidth, although the use of a private VLAN would be highly recommended. Likewise, offering partnerships, or Backup-Transit between ISPs, insures that more expensive WAN-management for backup purpose are not required. Hence both members gain from each-other and avoid effective direct costs.
There is an AUP that each member must follow, and of which the violation will lead to the closure of the port until the breach is corrected. It is advised that a member will not reach the single-Point-of-Failure of the N-IX Infrastructure. A substitute way on an other structure is still strongly recommended. We are however working so that the platform does not have any downtime to the users, with maximum availability.