END-TO-END AND SERVICE FUNCTION FORWARDER (SFF)-TO-SFF SERVICE FUNCTION PATH CONTINUITY CHECK USING BIDIRECTIONAL FORWARDING DETECTION (BFD)
Publication Date: 2016-Aug-30
The IP.com Prior Art Database
A solution is presented herein that uses an extended Service Function Chain trace to query a Bidirectional Forwarding Detection (BFD) Discriminator from each Service Function Forwarding (SFF) in any specific Service Function Path (SFP). Each Service Function will simply increment the Service Index (SI) and forward back to the SFF if the received packet has the O bit set and NextProto is set to BFD. In such cases, the Service Function will skip packet processing. Each SFF will look to use the details in a Network Service Header (NSH) header to determine if the packet should be handled locally by the BFD module. If not, it simply forwards the packet as per SFF table.