IETF PARIS1 SONET/SDH Emulation CEP-11 Andy Malis, Tellabs Prayson Pate, Overture Networks Ron Cohen, Resolute Networks David Zelig, Corrigent

IETF PARIS2 Structured SDH Emulation STM-1 STM-4 4xE1 STM-4 SDH Ring VC-4 MPLS PSN 4xVC-12 4xVC-4 VC-4

IETF PARIS3 CEP-10 Draft has been stable for a long while (over 3 years) However, Control Word is not aligned with Recommended PW Control Word –Not ECMP friendly –Can not run VCCV –Special CEP MPLS adaptation header used –Not aligned with other L1 TDM PW

IETF PARIS4 CEP-10 CW E: Header Extension R: Remote Defect Indication (CEP-RDI) D: DBA mode (Compressed Payload) N,P: Pointer Adjustment Indications and CEP-AIS Structure Pointer: Offset of SPE/VT in packet Sequence number: 14 bits (16 bits in PW-CW)

IETF PARIS5 PW-CW Flags: Service Specific Flags FRG: Fragmentation (First, Intermediate, Last) Length: Optional (Set if payload below 64 bytes) Sequence Number: all values used (L1 services), 0 as non sequenced (L2 services) indication

IETF PARIS6 CEP-11 CW L: Forward Defect Indication (CEP-AIS) R: Remote Defect Indication (CEP-RDI) N,P: Pointer Adjustment Indications FRG: Set to Zero Length: Used to signal DBA (no payload) Sequence number: L1 (all values) Structure Pointer: 13 bits

IETF PARIS7 CEP-11 Fractional VC-4 CW Extension headers configured on both ends (no E bit)

IETF PARIS8 Pointer Indications N,P –0,0 : Normal Operation –1,0 : Negative Pointer Justification Indication –0,1 : Positive Pointer Justification Indication –1,1 : Loss of Pointer Alarm –All indications are replayed three times (this is a change from CEP-10 were VT N,P indications are on super-frame boundaries)

IETF PARIS9 TDM PWs STM-1 STM-4 4xE1 VC-4 MPLS PSN 4xE1 4xVC-4 VC-4 E1 CEP PE SATOP PE CESoPSN PE NxDS0 MS PE

IETF PARIS10 Questions? Thanks!