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We consider the IPv6 Segment Routing (SRv6) technology for Service FunctionChaining of Virtual Network Functions (VNFs). Most of the VNFs are legacy VNFs(not aware of the SRv6 technology) and expect to process traditional IPpackets. An SR proxy is needed to support them. We have extended theimplementation of SRv6 in the Linux kernel, realizing an SR-proxy, referred toas SRNK (SR-Proxy Native Kernel). The performance of the proposed solution(SRNKv1) has been evaluated, identifying a poor scalability with respect to thenumber of VNFs to be supported in a node. Therefore we provided a second design(SRNKv2), enhancing the Linux Policy Routing framework. The performance ofSRNKv2 is independent from the number of supported VNFs in a node. We comparedthe performance of SRNKv2 with a reference scenario not performing theencapsulation and decapsulation operation and demonstrated that the overhead ofSRNKv2 is very small, on the order of 3.5%.

An Efficient Linux Kernel Implementation of Service Function Chaining for legacy VNFs based on IPv6 Segment Routing