Metro Ethernet and evolution of Virtual Private LAN Services (VPLS) K. A. K. Perera MEng CEng MIET Deputy General Manager Data Services & VoIP Sri Lanka Telecom

 Requirements of Customers  Metro Ethernet Models  Metro Ethernet Services  Ethernet over IP/MPLS  Discussion Agenda

 Requirements of Customers  Metro Ethernet Models  Metro Ethernet Services  Ethernet over IP/MPLS  Discussion Agenda

 High Speed Connectivity (10,20,50 Mbps….) Point to Point Data Connectivity Network Connectivity Internet Connectivity  Better Service Levels Network availability % (Can go out of service only minutes per year) Ring Access Networks Highly available Data Nodes Fast network resiliency Requirements of Customers

 New and enhanced Services LAN interconnections Virtual Private LAN Services (VPLS) Enhanced QoS (Quality of Service)  Cost Effectiveness Multiple Services on a single port Cheap Services – particularly at higher speeds Requirements of Customers

What is the solution ? Metro Ethernet Why Ethernet ? - Most common Interface today - Cost effective - Supports very high Bandwidths (upto 1Gbps) - Flexible upgrades within a wide range (1Mbps to 1Gbps) - Easy and simple to manage and maintain

What is Ethernet ? Ethernet is a standard communications protocol embedded in software and hardware devices, intended for building a Local Area Network (LAN). Ethernet transmits data at 10Mbps, Fast Ethernet supports up to 100Mbps and Gigabit Ethernet supports up to 1Gbps.

What is Metro Ethernet ? Metro Ethernet is a standardized, carrier-class service defined by five attributes Service providers worldwide are migrating their networks to deliver Metro Ethernet services

 Requirements of Customers  Metro Ethernet Models  Metro Ethernet Services  Ethernet over IP/MPLS  Discussion Agenda

Metro Ethernet Models QinQ (Stacked VLAN) - IEEE 802.1ad MinM (Backbone Provider Bridge) - IEEE802.1ah Ethernet over IP- MPLS (Pseudowires) - IETF RFC 4448 payloadDASAFCS 802.1q

a1 Q Q Q Q Service Provider Metro Ethernet QinQ Principle Enterprise CPE Carrier Access a1 b1 Q Ethernet Access b1 a1 Q Customer

MinM Principle Site X Site Y Service Provider Metro Ethernet network Ethernet Switches Enterprise Ethernet header User data SP Ethernet header Ethernet packet arrives from enterprise CPE node at SP ingress switch Ethernet UNI (source) SP Ingress switch adds SP Ethernet header Src and Dest MAC addresses are Ethernet UNI ports Ethernet UNI (destination) Ethernet packet switched across the Service Provider network using details in SP Ethernet header SP Egress switch removes SP Ethernet header And forwards original Ethernet packet to end customer CPE

 Requirements of Customers  Metro Ethernet Models  Metro Ethernet Services  Ethernet over IP/MPLS  Discussion Agenda

Metro Ethernet Services - High Speed Data Links (VLL) (LAN interconnections) - Virtual Private LAN Services (VPLS) - High Speed Internet - Access to IP-VPN main links (VPN backhauling)

Typically required to connect; - Headquaters Building (Main Link) - Dissaster Recover Centers (DRC) (LAN interconnections) High Speed Data Links (VLL) Metro Ethernet LAN interconnection Head QuartersDRC Site

Virtual Private LAN Services (VPLS) - Customer feels like remote offices are connected to the same LAN Metro Ethernet Branch A Branch C Branch B Head Quarters VPLS

Applications; - Web browsing - Hosting applications - Video Straeming - Multimedia - Cyber Cafe High Speed Internet Links Metro Ethernet Internet

VPN back-hauling - Metro Ethernet is used as the Access Network Existing IP/MPLS Backbone Metro Ethernet IP-VPN VPN Back-haul Edge Router M-Agg Branch A Branch B Branch C Head Quarters IP-VPN

Multiple Services on single port - IP-VPN back-hauling - Layer 2 VPN services (VPLS) - High Speed Data Links (LAN interconnections) - High Speed Internet Single Port PE CPE IP-VPN High Speed Internet VPLS High Speed Data Metro Ethernet

Available Speeds; - From 1 Mbps to 1000Mbps (1Gbps) Low Speeds (proposed); - 1, 2, 3, 4, 5, 6, 8, 10Mbps High Speeds (proposed); - 10, 15, 20, 25, 30, 35, 40, 50, 75, 100Mbps,1Gbps Available Speeds

 Requirements of Customers  Metro Ethernet Models  Metro Ethernet Services  Ethernet over IP/MPLS  Discussion Agenda

Why MPLS for Ethernet Services (EoMPLS)? More Scalable (Free label Space) Sub 50msec resiliency (MPLS Fast Reroute) Traffic Engineering (RSVP-TE) Hierarchical QoS (HQoS) Easy and simple to operate and maintenance

Ethernet Services across MPLS P2P Ethernet Service;  Pseudowire (draft-martini) – VLL High Speed Data Links – LAN interconnections High Speed Internet Access to IP-VPN main links (VPN backhauling) MP2MP Ethernet Service;  Virtual Private LAN Services – VPLS

Modes of Pseudowires PW can be configured as;  Raw Mode – Virtual connection (VLL) between two Ethernet ports  Tagged Mode – Virtual connection (VLL) between two VLAN (802.1Q) ports payloadDASAFCS 802.1q payload DA SAFCS

Pseudowire – Draft Martini PWs are constructed by building a pair of unidirectional MPLS (Label Switch Paths) LSPs between PEs LSP labels can be;  Statically assigned or  Assign using LDP or RSVP

PW LDP with directly connected PEs CE PE 1 (LER 1)PE 1 (LER 2) (Label 102) (Label 201) VC LSPs 102 MPLS Packet 102 PW(VC) Label Ethernet Packet Ethernet Packet LDP Session This type of encapsulation is used to tunnel ATM, FR and other circuit emulation traffic too payloadDASAFCS 802.1q payloadDASA 802.1q payloadDASA Tunnel Label DA’SA’802.1qFCS

VPLS - Introduction VPLS (L2VPN);  Configure on the MPLS  Offers MP2MP VPLS emulates a LAN, which provides;  Full learning capabilities and  Full switching capabilities VPLS allows Customers to fully control their Routing (IP, IPX, IPv6)

VPLS Reference Model VPLS A VPLS B VPLS A VC LSPs LAN Services LSP Tunnels (Pseudowire) PE 1PE 2 PE 3 CE PEs can participate in one or many VPLS domains CEs visualize VPLS like an Ethernet Switch Broadcast domains are maintained per VPLS basis by PEs CE SLT Metro Ethernet (MPLS)

VPLS requirements Separation between VPLS domains;  Each customer domain emulates its own LAN  VPLS PEs must maintain separate Virtual Switching Instance (VSI) per VPLS MAC learning;  Capable of learning and forwarding based on MAC addresses

VPLS requirements (Cont.) Switching;  VPLS should be capable of switching packets between different tunnels based on MAC addresses Flooding;  VPLS should be able to support the flooding packets with unknown MAC addresses

Hierarchical VPLS (HVPLS) MTU Spoke VCs Hub VCs MTU PE MTU CE Routers VLANs, Stacked VLANs or VC Labels MTU PE MTU PE MTU Not scalable Hierarchy reduces full mesh network - scalable

Configurations of VPLS VPLS A PE 1 PE 2 PE 3 CE 1)Bridged VPLS – VPLS and Customer LANs are in the same broadcast domain (Routers not required) CE Metro Ethernet (MPLS) CE

Configurations of VPLS VPLS B PE 1 PE 2 PE 3 CE 2)Routed VPLS – VPLS and Customer LANs are in different broadcast domains (Routers/L3 Switches are required) CE Metro Ethernet (MPLS) CE

Quality of Service (QoS) Reserve 8 Mb/s Reserve 2 Mb/s Reserve 4 Mb/s 16 Mb/s DSCP=5=voice DSCP=4=video DSCP=1=Data DSCP=0=Internet Installed SLA  Voice 2 Mb/s  Video 2 Mb/s  Data 4 Mb/s  Internet 8 Mb/s  TOTAL=16 Mb/s required Actual usage  Voice 1 Mb/s  Video 1 Mb/s  Data 4 Mb/s  Internet 8 Mb/s  TOTAL = only 14 Mb/s used If higher priority traffic is not consuming all the reserved bandwidth, the lower priority forwarding classes cannot use the remaining bandwidth – Solution HQoS

Normal QoS Vs HQoS Normal QoSHierarchical QoS Strict / Weighted Rate Limiting Schedule Queue Strict / Weighted Rate Limiting Schedule Queue Unique 3-level parent/child scheduling  Maintains relative priorities  Enables lower priority bursting when higher priority is below CIR DSCP=5=voice DSCP=4=video DSCP=1=Data DSCP=0=Internet

High Speed Resiliency - The switchover from the working link to the protection link will happen within sub 50ms to ensure that no impact on real time applications - MPLS (Multi Protocol Label Switching) with MPLS Fast Reroute enables this feature R1 R2 R3 R4 R5 R6 R7 R8 R9 End-to- End Repair Point of Local Repair (PLR) Detour LSP Primary Path Secondary Path

Existing IP/MPLS Backbone Reference Network – SLT Slave Island Liberty plaza Colombo Havelock town Maradana M-Agg GE N-PE 10GE L2 MPLS Aggregation Ring 5 Rings 1 Ring 3 Rings

Ethernet service revenues

Concluding Remarks “Metro Ethernet” delivers cost effective, high speed, scalable, reliable and multi-service Ethernet services to the customers through the sate-of-the-art MPLS technology

 Requirements of Customers  Metro Ethernet Models  Metro Ethernet Services  Ethernet over IP/MPLS  Discussion Agenda

Thank you