Encoding inter-domain shared service paths

摘要

Techniques are presented to enable the instantiation of a service chain that is comprised of service functions belonging to one or more administrative domains. A service chain consisting of one or more service functions in one administrative domain is made available to another administrative domain through an advertisement. This enables the building of inter-domain service chains without the need to share between the administrative domains details about the service chains and service functions in the respective administrative domains.

主权项

1. A method comprising:
at a controller associated with a first administrative domain, generating data describing a service chain comprising one or more service functions to be performed at one or more network nodes in the first administrative domain; at the controller associated with the first administrative domain, generating information that summarizes the service chain in the first administrative domain, wherein the information that summarizes the service chain comprises a service path identifier that represents a sequence of one or more service functions and a service index field that indicates a number of service functions in the sequence; and advertising the service chain in the first administrative domain to at least a second administrative domain by sending to a controller associated with the second administrative domain a message indicating the service path identifier and the service index field allocated to the service chain in the first administrative domain.