Hello Greg, Alan, We have now completed the NSI CS v2.1 protocol specification. I have uploaded this to a Redmine issue here: https://redmine.ogf.org/issues/308 We would appreciate if this could go out to public comment soon to give the community a chance to comment. Regards, Guy Guy Roberts PhD Senior Transport Network Architect Tel: +44 (0)1223 371316 Mob: +44 (0)7881 336417 Skype: guy1965 GÉANT Networks • Services • People Learn more at www.geant.org​<http://www.geant.org/> ​ [1458313942947_TNC16-signature-banner.gif]<https://tnc16.geant.org/> GEANT Limited, trading as GÉANT. Registered in England & Wales. Registration Number 2806796. Registered Office – City House, 126-130 Hills Road, Cambridge CB2 1PQ