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Overview

MEF LSO defines a set of specifications and reference points aimed at providing end to end service orchestration across multiple network domains using standardized APIs. One of the reference points in this set is interlude which focuses on providing control related management interactions between service provider and partner (link). The other inter-provider reference point in LSO is SONATA which mainly focuses on the OSS/BSS level business interactions. As ONAP is not specifically on the SONATA level of interactions, the rest of the document focuses mainly on the interlude reference point in MEF and similar specifications in other standard organizations. While interlude is one of the reference point and specification which addresses inter-provider interaction, it is worthwhile to look at the broader scope considering typical operational, business use cases and aspects impacting such interactions in ONAP External API specifically and ONAP in general.

Another relevant specification worth looking at is 5GExchange project (link) as part of 5GPPP is one of the relevant project worth referring which focuses on "cross-domain orchestration of services over multiple administrations or over multi-domain single administrations" (link). 5GEx project defines a multi-domain logical interworking architecture which covers multi-operator interaction and multi-domain interaction within the same operator. As part of the 5GEx project a detailed study is being conducted around inter-domain and inter-provider interactions and results are published here.

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The topic of inter-provider/inter-domain interaction is being discussed in TMF ODA, ETSI ZSM, but these specifications are still in the early stages of development and may not be relevant in the near future of ONAP development.

Another specification worth looking referring is ETSI IFA 028 v3.1.1 - wherein MANO architectural options to support multiple administrative domains is being discussed. This specification introduces two concepts - MLPOC (Multiple Logical Point of Contact) and SLPOC (Single Logical Point of Contact) with varying degrees of cross-layer interaction and information abstraction across domains. This specification also defines an Or-Or interface across NFVOs in different administrative domains.

Multi-domain Interaction

As defined in 5GEx project multi-domain can be multiple network operators or it can be multiple subdomains within a single operator. The scope of interaction might be slightly different within single operator domains and across multiple operators because the latter will be governed by SLAs with strict policies and predefined trust/contract between the two operators. So security and trust are some of the key criteria for interaction across multiple parties. All interaction should be governed, policy controlled based on the trust agreement. Within the same operator domain, there can be multiple administrative domains which can be governed by SLO/OLOs and trust agreement as in the case of inter-provider interaction. But there can also be a model of distributed deployment which may not fit into the purview of multi-domain interaction . For example georedundancy and HA deployments may not be classified as multi-domain interaction, but governed mostly by policies defined between two software components and interaction over internal APIs. vs Multi-provider Interaction

Federation and Delegation

Business Agreement

Possible Interactions

Cross-layer Interaction