1. S-BFD Alert Discriminator draft-akiya-bfd-seamless-alert-discrim Nobo Akiya Carlos Pignataro Dave Ward IETF 92, Dallas, USA

2. Why? Extensions for S-BFD discriminator advertisements -> IS-IS, OSPF, BGP-LS Primary purpose of the S-BFD alert discriminator is to allow target S-BFD discriminator discovery at the BFD layer for other scenarios: – inter-AS – control-plane-less – etc Secondary purpose is to allow for other future extensions (if required)

3. How does it work? IETF92 S-BFD Alert Discriminator3 A B C D A B C D A B C D S-BFD Ping YourDisc=0 MyDisc=777 S-BFD Pong YourDisc=777 MyDisc=123 1: What’s your S-BFD disc? 2: Here’s my S-BFD disc 4: Normal ping-pong operation S-BFD Ping YourDisc=123 MyDisc=777 S-BFD Pong YourDisc=777 MyDisc=123 My S-BFD disc is 123 3: Thanks for the disc!

4. What is proposed? Proposes to reserve S-BFD discriminator zero(0) as the alert discriminator. Diagnostic code within the alert discriminator contains instructions. IETF92 S-BFD Alert Discriminator4 Value Alert Discriminator Diagnostic Code Name Reference ------ ---------------------------------------- ------------- 0-7 Experimental This document 8-28 Reserved This document 29 Target S-BFD Discriminator Discovery This document 30 S-BFD Path Trace This document 31 Not Supported This document

5. Thank you! Questions/Comments? IETF92 S-BFD Alert Discriminator5