GMPLS Signaling Extensions for the Evolving G.709 OTN Control CCAMP
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GMPLS Signaling Extensions for the Evolving G.709 OTN Control CCAMP WG, IETF 78th, Maastricht, Netherlands draft-zhang-ccamp-gmpls-evolving-g709-05.txt Fatai Zhang Guoying Zhang Sergio Belotti Daniele Ceccarelli [email protected] [email protected] [email protected] [email protected]
Changes from Version 04 Tributary Port Number (TPN) assignment by control plane is introduced in this new version – Auto-MSI is deprecated by G.798 – Added a section to introduce a new TPN object and describe the procedure of TPN assignment
TPN in Data Plane TPN is carried by N MSI bytes in the OPUk overhead N the total number of TS Each byte indicates the multiplex structure of one TS One TPN is assigned for the same LO ODUj in each OTUk link MSI [i] LO ODU TPN #1 ODU2 2 #2 ODU2 2 #3 ODU1 x #4 ODU1 y #5 ODU2 2 #6 ODU2 2 #7 #16 Others Others MSI bytes in OPUk OH TPN 2 A TPN 2 OTU3 link TPN 3 B TPN 3 OTU3 link C
TPN Assignment by Control Plane Auto-MSI (data plane TPN assignment) is deprecated by G.798, so Control Plane TPN assignment is needed OTU3 link Downstre am Assignme nt Upstream Assignme nt A A OTU3 link B Path: Req ODU2 Resv: Label #1/2/5/6, TPN 2 Path: Req ODU2 Resv: Label #2/4/5/6, TPN 3 OTU3 link OTU3 link Path: Label #1/2/5/6, TPN 2 Resv: accept B Path: Label #2/4/5/6, TPN 3 Resv: accept C C
New Object for TPN A new TPN object is introduced in the PATH and/or RESV message to support TPN assignment 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - D Reserved TPN - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - D bit: indicate downstream or upstream TPN assignment TPN (16 bits): the assigned TPN value
Next Steps Adopt it as a WG document – Many people are interested in this topic – Significant agreement have been achieved – Quite stable for quite long time Investigate the possibility to put TPN information into Label object Refine it according to the feedback from the meeting or mailing list
