(Direct) PTP over MPLS (?)

Ron CohenIETF Maastricht 2010

ronc@ieee.org

Draft-ronc-ptp-mpls-00.txt (expired)

Transports

PTP Sync/Delay Message Format

TRANSPORT SPECIFIC MESSAGE TYPE VERSION = 2RESERVEDMESSAGE LENGTH

DOMAIN RESERVEDFLAGS

CORRECTION FIELD(48bits ns, 16bits scaled fractional ns)

RESERVED

SOURCE PORT IDENTITY

SEQUENCE IDCONTROL LOG MEAN MESSAGE INTERVAL

ORIGIN TIMESTAMP(48bits seconds, 32bits ns)

Scenarios

Carrier

Operator

Scenarios

Carrier

Operator

Timing Service

PTP Transport Service

MPLS Cloud

Last HopMicrowave

PTP Transport Service

Desired SLA

MPLS Cloud

PTPPTP

Main Requirement

More to handle…

Alternative: Distributed TC Approach

Direct PTP over MPLS

Internal Synchronization

Why Not PTP o Layer 2

802.3Ethernet

SDHPOS

802.17 RPR

PTP

Using MPLS Protection

P-Delay

A

B

C

D

E

Primary Path

Secondary Path

Using MPLS Protection

A

B

C

D

E

Primary Path

Secondary Path

Detour Path

And p2mp Sync Distribution

A

B

C

D

E

Sync

Why Not IP over MPLS?

PTP

LSP

Summary

Thanks