Carrier Ethernet Network Solutions
Extending Connection-Oriented Ethernet End-to-End Using MPLS-TP
Pat MooreMetaswitch Networks
Network Technologies [email protected]
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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
Customers
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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
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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
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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
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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
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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
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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
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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
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MPLS-TP Deployment Scenarios
Metaswitch is seeing MPLS-TP interest from equipment vendors in almost all segments above
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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