DNS Update Based Service Function Update
Huawei
In a Service Function Chaining (SFC)-enabled domain, the Domain Name System (DNS) can be used as a mechanism for Service Function (SF) auto-discovery [I-D.xu-dnssd-sf-discovery]. Since the information associated with SF instances (e.g., capacity and current load) would change dynamically, the information associated with SF instances which is stored in the DNS sever needs to be updated accordingly. This document describes how to use the DNS UPDATE mechanism [RFC2136] to dynamically update the corresponding Resource Records (RRs) for SF instances.