Carrier ethernet-network-solutions

Carrier Ethernet Network Solutions

Extending Connection-Oriented Ethernet End-to-End Using MPLS-TP

Pat MooreMetaswitch Networks

Network Technologies [email protected]

http://www.metaswitch.com

Copyright © Metaswitch Networks | www.metaswitch.com | 1

Metaswitch Expertise

Previously Data Connection Ltd. (DCL)• Network Protocol source code since 1983• 1st portable GMPLS protocol solution• 1st portable O-UNI protocol solution• 1st portable LMP protocol solution• 1st portable G.709 OTN protocol solution• 1st portable MPLS-TP protocol solution

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MPLS-TP Overview

Packet-switched MPLSCE PEAttachment

Circuit

PW

Service

PE CEAttachment

Circuit

MPLS-TP LSP

• MPLS-TP = Ethernet + GMPLS + OAM• + Control Plane (optional)

• Typically with a pseudowire (PW) layer above

CE Customer EdgePE Provider EdgePW Pseudowire



MPLS-TP Re-uses Existing Technology

• MPLS transport over Ethernet, e.g.• Bi-directional LSPs

• Ensures sent/received traffic follows same route• “Profiling” to remove MPLS features not suited to transport

• Penultimate-hop label popping• Optional Management Plane provisioning• Optional GMPLS Control Plane for MPLS-TP facilitates

• Automated provisioning• Sophisticated protection and restoration

• MPLS-TP OAM is the major new addition



MPLS-TP OAM• OAM for both PW and MPLS-TP

• Separately monitor service and transport

• There are a number proposed OAM alternatives• Y.1731 (pre-standard deployments?)• RFC 5586 MPLS Generic Associated Channel (GACh)

Pop LSP label from stack.

Recognize Generic Associated Label

Parse Associated Channel Header Determine OAM

protocol type.

Process OAM protocol message.

LSP egress moduleGACh processing

moduleOAM specific

module

• Continuity Check• Continuity Verification• Packet Loss Monitoring• Delay Measurement• Remote Defect Indication• Alarm Reporting• Client Signal Failure Indication• Lock Reporting• More…

• GACh allows various OAM schemes and protocols

LSPData

GACh

LSP Label Payload

LSP LabelS=0

GAL = 0x0DS=1

OAM Protocol Data



Network Layering Example• Multi-Segment Pseudowires allow a COE circuit to

• Transition between different technologies• Management provisioned / Control Plane signaled• MPLS-TP / traditional MPLS

• Transition between different Carriers

• Anticipated deployment case• Management provisioned PWs at the edge• Control Plane signaled PWs across the backbone• Potential for statically configured T-PEs at customer sites

Packet access

MS-PW

Service

Backbone

S-PEPacket access

S-PE

StaticLSPLSPStatic

T-PEStaticT-PE

StaticLSP

S-PE Switching PE T-PE Terminating PE



OAM is Layered as well• End-to-end OAM for Service

• PW-layer OAM• Monitor / diagnose a particular Carrier or Network Region

• Per-carrier or per-region OAM• Monitor / diagnose each hop of an LSP

• Common OAM technology

Packet access

MS-PW

Service

Backbone

S-PEPacket access

S-PE

StaticLSPLSPStatic

T-PEStaticT-PE

StaticLSP



Layering is Potentially More Extensive• Multiple layers can include

• Service layer (e.g. PW for Ethernet service)• MPLS-TP transport layer• TDM layer (e.g. OTN ODU)• WDM layer (e.g. OTN OCh)

• Each Carrier uses only the layers it needs• Only use a layer if it adds value

• (G)MPLS is a common theme



Range of Services• Ethernet Services

• MEF E-LINE, E-TREE and E-LAN• Use PW and MPLS-TP to carry Ethernet traffic

• E-LAN adds L2 switching• Stat-mux or reserved resources

• Non-Ethernet L2 Services on same network• PDH for GSM• ATM for 3G backhaul• Use PW as above• Includes timing for base station synchronization

• L3 Services• Unicast (RIP, OSPF, BGP, IS-IS)• Multicast (PIM)• Private VPNs (BGP / MPLS)

• All services run over any transport• MPLS-TP• TDM• WDM

All can use a common MPLS control plane



MPLS-TP Deployment Scenarios

Metaswitch is seeing MPLS-TP interest from equipment vendors in almost all segments above



Summary

• MPLS-TP is building huge momentum• Pre-standard deployments beginning• Applicable to many networks• Needs to be on carrier’s radar

• Standards are well advanced• Re-use of existing technology where possible• OAM well advanced

• Common (G)MPLS technology across layers• Coherent management


Thank [email protected]
