Metro Ethernet Concepts


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Metro Ethernet Concepts

  1. 1. METRO ETHERNET (ME)OCTOBER 2012By Eng. Anuradha Udunuwara,BSc.Eng(Hons), CEng, MIE(SL), MEF-CECP, MBCS, ITILv3 Foundation, MIEEE, MIEEE-CS, MIEE, MIET, MCS(SL), MSLAAS
  2. 2. Agenda2  ME concepts  ME technology (c) Anuradha Udunuwara
  3. 3. 3 ME concepts (c) Anuradha Udunuwara
  4. 4. Ethernet vs. ME4  Ethernet  a transport technology  an interface  a protocol (the 1st asynchronous protocol designed to carry data)  ME  a service (with defined set of attributes)  ME = Carrier Ethernet (CE) (c) Anuradha Udunuwara
  5. 5. 5 What is CE? definition  Carrier Ethernet is a ubiquitous, standardized, carrier-class SERVICE defined by 5 attributes that distinguish Carrier Ethernet from familiar Local Area Network (LAN) based Ethernet Source: MEF ( (c) Anuradha Udunuwara
  6. 6. Attributes6 Source: MEF ( (c) Anuradha Udunuwara
  7. 7. ME drivers7 1. Simplicity 2. Any transport (c) Anuradha Udunuwara
  8. 8. 8 Yesterday LAN Point to Point Protocol (PPP)/HDLC LAN Ethernet Ethernet Today (ME) LAN Ethernet LAN Ethernet Ethernet Routing over Ethernet is simple and more scalable than routing over many Point to Point (PP) links. •Routing Information Protocol (RIP) can broadcast or multicast updates •Intermediate System to Intermediate System (ISIS) & Open Shortest Path First (OSPF) form a single adjacency per LAN (c) Anuradha Udunuwara
  9. 9. ME9 Wired Wireless (c) Anuradha Udunuwara
  10. 10. The stack 10 Internet Protocol (IP) based IP-Virtual Private Network (VPN), IP Television (TV)…… Services Ethernet Connectivity E-LINE (ex:-VLL), E-LAN (ex:-VPLS), E-Tree, E-Access Services Connectivity service VLAN (QinQ), MAC in MAC, Multi Protocol Label Switching (MPLS)Transport separation Multiple transport xPON, Ethernet, G.SHDSL, wireless, SONET/SDH, xWDM…. technologies (c) Anuradha Udunuwara
  11. 11. 11 E-Line E-LAN  Ethernet Private Line (EPL) E-Tree  Ethernet Virtual Private Line (EVPL) (c) Anuradha Udunuwara
  12. 12. EPL vs. EPVL12 User to Network Interface (UNI) CE Customer Edge (CE) EPL EPVL Multiplexed service UNI: Virtual LAN (VLAN)/S-VLAN/Ethernet Port Network to Network Interface (NNI): MPLS (LDP,RSVP,BGP) LSP (c) Anuradha Udunuwara
  13. 13. L2 Switch vs. Metro Ethernet Network (MEN)13 L2 Switch (c) Anuradha Udunuwara
  14. 14. L2 switching vs. L3 Routing14  Until the destination is  Does not flood the found the network is network flooded  VLAN reduces unnecessary flooding (c) Anuradha Udunuwara
  15. 15. L2 switching15  Media Access Control (MAC) based  VLAN based (c) Anuradha Udunuwara
  16. 16. L2 switch16 • MAC learning table (forwarding table) – MAC/VLAN <-> port • VLAN table – identification/separation (used for tagging/un tagging) – VLAN <-> port A VLAN is assigned to a port by the switch. This is not dynamic. Need to provision. (c) Anuradha Udunuwara
  17. 17. Functions of a L2 Switch17  MAC learning (populating the MAC/VLAN table)  Forwarding (uses MAC/VALN table)  If a computer does not send traffic (silent), then all the traffic coming to that computer come as flooding (the switch learns the computers MAC by the source MAC). (c) Anuradha Udunuwara
  18. 18. Broadcasting18  Ex:- server advertises its presence to the clients Single Client Client broadcast domain L2 Switch (flood) Server (broadcast) (c) Anuradha Udunuwara
  19. 19. QinQ aka stacked VLANs19  = Institution of Electrical & Electronic Engineers (IEEE) 802.1QiQ = IEEE 802.1ad (provider bridging)  [customer (C)-VLAN inner, Service provider (S)- VLAN outer] (c) Anuradha Udunuwara
  20. 20. MAC in MAC20  PBB = Provider Backbone bridging = IEEE 802.1ah  VLAN + MAC  PBB-Traffic Engineering = PBB-TE = IEEE 802.1Qay  VLAN + MAC + TE (c) Anuradha Udunuwara
  21. 21. EFM = Ethernet in the First Mile = IEEE 802.3ah21  2 Base – TL (2Mbps min, Base Band, Twisted pair Cu, Long Reach)  10 Pass – TS (10Mbps min, Pass Band, Twisted pair Cu, Short Reach) (c) Anuradha Udunuwara
  22. 22. MPLS22  IP/MPLS is one of the ways to path engineer an Ethernet frame Service MPLS Transport (c) Anuradha Udunuwara
  23. 23. EoMPLS (Ethernet over MPLS)23  Port based  VLAN based (c) Anuradha Udunuwara
  24. 24. Transport MPLS (T-MPLS)24  Started as MPLS-TP (Transport Profile)  T-MPLS = IP/MPLS - IP (c) Anuradha Udunuwara
  25. 25. Virtual Private LAN services (VPLS)25  RFC 4761 – VPLS with Border Gateway Protocol (BGP) (end points are auto discovered)  RFC 4762 – VPLS with Label Distribution Protocol (LDP) (end points need to be manually configured)  or use BGP auto discovery feature (c) Anuradha Udunuwara
  26. 26. Hybrid Fiber Coax (HFC)26 Fiber Coax x HFC {FTTx ; x= Curb, Node, Building} FTTP (premise) {Passive Optical Network (PON), Wavelength Division Multiplexing (WDM)} (c) Anuradha Udunuwara
  27. 27. Wireless backhaul using Ethernet (Radio Access Networks –RAN)27  Wi-Fi, WiMAX – ex:- EoMPLS  GSM – EoSDH CES 2, 2.5G 3G WIMAX E-LINE TDM (E1) ATM Ethernet,IP (c) Anuradha Udunuwara
  28. 28. ME Technology
  29. 29. Types of Networks29 1.Local Area Network (LAN) 2.Wide Area Network (WAN) 3.Metropolitan Area Network (MAN) (c) Anuradha Udunuwara
  30. 30. LAN30 •A group of computers and network communication devices interconnected within a geographically limited area, such as a building • Characterized by, • Transfer data at high speeds • Exist in a limited geographical area • Resources are managed by the company running the LAN. (c) Anuradha Udunuwara
  31. 31. WAN31 •Interconnects LANs • Characterized by, • Transfer data at low speeds • Exist in an unlimited geographical area • Interconnects multiple LANs • Connectivity and Resources are managed by a Telephone Company (c) Anuradha Udunuwara
  32. 32. Why Ethernet ?32  Most common Interface today  Cost effective  Supports very high Bandwidths (upto 10 Gbps)  Flexible upgrades within a wide range (ex: 1Mbps to 1Gbps)  Easy and simple to manage and maintain (c) Anuradha Udunuwara
  33. 33. L1, L233  Connection Oriented  Circuit Switched Ex:-Time Division Multiplexing (TDM), Asynchronous Transfer Mode (ATM), Frame Relay (FR)  FR and ATM have a Virtual Circuit (VC) identifier (VCI/VPI Virtual Channel Identifier/Virtual Path Identifier). Therefore, we do not have to create labels. (c) Anuradha Udunuwara
  34. 34. L334  Connectionless  Packet Switched Ex:-IP (c) Anuradha Udunuwara
  35. 35. L2 & L335  Traffic is switched  Control signal is routed Ex:-IP/MPLS  Ethernet does not have a label. Therefore, we have to create labels. One way is using MPLS. (c) Anuradha Udunuwara
  36. 36. Why MPLS for Ethernet Services (EoMPLS)?36  More Scalable (Free label Space)  Sub 50msec resiliency (MPLS Fast Reroute (FRR))  Traffic Engineering (RSVP-TE)  Hierarchical QoS (HQoS)  Easy and simple to operate and maintain (c) Anuradha Udunuwara
  37. 37. Ethernet over MPLS over Ethernet IP37 .1q Ethernet MPLS Service label=VC label=inner label MPLS or GRE Outer label Ethernet GE,10GE etc. Physical Physical Network Ethernet Service Switch Service (c) Anuradha Udunuwara Traffic
  38. 38. The world of headers38 (c) Anuradha Udunuwara
  39. 39. Ethernet frame: Get me to the other side39 RSVP-TE signaling B D A LDP signaling session (TCP port 646) E C Ethernet Ethernet MPLS Outer label 1 Outer label 2 Outer label 3 Outer label 4 Inner label Inner label Inner label Inner label Ethernet Ethernet Ethernet Ethernet Ethernet Ethernet (c) Anuradha Udunuwara
  40. 40. Redundancy40 Protection Restoration (before *) (after *) Global Local Global Local Ex: standby LSP Ex: Secondary Ex: Detour LSP LSP in FRR * failure (c) Anuradha Udunuwara
  41. 41. High Speed Resiliency41 - The switchover from the working link to the protection link will happen within sub 50ms to ensure that no impact on real time applications - In an EoMPLS, MPLS FRR enables this feature D 1 B 2 E A 3 Primary Path C Secondary Path Detour Path (c) Anuradha Udunuwara
  42. 42. RSVP + CSPF (=OSPF-TE)42 RSVP - TE FRR (c) Anuradha Udunuwara
  43. 43. QoS43  Latency (delay)  Jitter (variation in delay) SLA  Packet loss (c) Anuradha Udunuwara
  44. 44. About the Author44 Eng. Anuradha Udunuwara is a Chartered Engineer by profession based in Sri Lanka. He has nearly a decade industry experience in strategy, architecture, engineering, design, plan, implementation and maintenance of CSP Networks using both packet-switched (PS) and Circuit-Switched (CS) technologies, along with legacy to NGN migration. Eng. Anuradha is a well-known in the field of CSP industry, both locally and internationally. Graduated from University of Peradeniya, Sri Lanka in 2001 with an honors in Electrical & Electronic Engineering, Eng. Anuradha is a corporate member of the Institution of Engineers Sri Lanka, a professional member of British Computer Society, a member of Institution of Electrical & Electronic Engineers, a member of Institution of Engineering & Technology (formerly Institution of Electrical Engineers), a member of the Computer Society of Sri Lanka, a life member of Sri Lanka Association for the Advancement of Science, senior member of the Carrier Ethernet Forum, member of the Internet Society, member of the Internet Strategy Forum, member of the Internet Strategy Forum Network, member of the Ethernet Academy, member of the NGN/IMS forum and member of the Peradeniya Engineering Faculty Alumni Association. He is also an ITIL foundation certified and the only MEF-CECP in the country. In his spare time Anuradha enjoys spending time with his family, playing badminton, photography, reading and travelling. He can be reached at (c) Anuradha Udunuwara