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Metro Ethernet Concepts (by slideshare)

트릭맨 2011. 12. 19. 08:48
Carrier Ethernet, PTS, PTN 또는 Metro Ethernet 용어들을 약간 혼란스럽게 사용하는 거 같습니다.
굳이 구분할 필요는 없는 거 같네요.
오늘은 Metro(Carrier) Ethernet의 기본 개념에 대해 알아봅시다.
참고로 요즘은 PBB-TE보다는 MPLS-TP가 대세라고 하네요..
Metro Ethernet Concepts
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Metro Ethernet Concepts - Presentation Transcript

  1. Metro Ethernet (ME) concepts 
  2. Ethernet vs. ME • Ethernet – a transport technology – The 1st asynchronous protocol designed to carry data • ME – a service (with defined set of attributes) • ME = Carrier Ethernet 
  3. What is Carrier Ethernet? definition • Carrier Ethernet is a ubiquitous, standardized, carrier-class SERVICE defined by 5 attributes that distinguish Carrier Ethernet from familiar LAN based Ethernet » Source: MEF (http://metroethernetforum.org/page_loader.php?p_id=140) 
  4. Attributes » Source: MEF (http://metroethernetforum.org/page_loader.php?p_id=140)
  5. ME drivers 1. Simplicity 2. Any transport 
  6. Yesterday LAN PPP/HDLC LAN Ethernet Ethernet Today (ME) LAN Ethernet LAN Ethernet Ethernet Routing over Ethernet is simple and more scalable than routing over many PP links. • RIP can broadcast or multicast updates • ISIS & OSPF form a single adjacency per LAN 
  7. ME Wired Wireless 
  8. The stack IP based IP-VPN, IPTV…… Services Ethernet Connectivity E-LINE (VLL), E-LAN (VPLS) Services Connectivity service VLAN (QinQ), MAC in MAC, MPLS Transport separation Multiple transport xPON, Ethernet, G.SHDSL, wireless, SONET/SDH, xWDM…. technologies
  9. E-Line E-LAN • Ethernet Private • VPLS (always virtual) Line (EPL) • Ethernet Private Virtual Line (EPVL) E-Tree 
  10. EPL vs. EPVL UNI CE CE EPL EPVL Multiplexed service UNI: VLAN/S-VLAN/Ethernet Port NNI: MPLS (LDP,RSVP,BGP) LSP 
  11. L2 Switch vs. MEN L2 Switch 
  12. L2 switching vs. L3 Routing • Until the destination • Does not floods the is found the NW is NW flooded. • VLAN reduces unnecessary flooding 
  13. L2 switching • MAC based • VLAN based 
  14. L2 switch • 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. 
  15. Functions of a L2 Switch • 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)
  16. broadcasting • Ex:- server advertises its presence to the clients Single Client Client broadcast domain L2 Switch (flood) Server (broadcast) 
  17. QinQ =802.1QiQ = 802.1ad (provider bridging) [C-VLAN inner, S-VLAN outer] VLAN 
  18. MAC in MAC =PBT=Provider Backbone Transport PBB=Provider Backbone Bridging=802.1ah=G.SHDSL.biz=EFM VLAN+MAC PBB-TE=802.1Qay VLAN+MAC+TE 
  19. EFM=802.3ah • 2 Base – TL (2Mbps min, Base Band, Twisted pair Cu, Long Reach) • 10 Pass – TS (10Mbps min, Pass Band, Twisted pair Cu, Short Reach) 
  20. MPLS • Can’t path engineer an Ethernet frame without IP/MPLS Service MPLS Transport
  21. EoMPLS • Port based • VLAN based 
  22. Transport MPLS (T-MPLS) T-MPLS = IP/MPLS + PW –IP/MPLS = PW ??
  23. VPLS • RFC 4761 – VPLS with BGP (end points are auto discovered) • RFC 4762 – VPLS with LDP (end points need to be manually configured) 
  24. Ethernet over Cu (DSL) • IEEE – IEEE 802.3ah (Ethernet in the 1st Mile) • ITU – G.992 (pair bonding)
  25. Hybrid Fiber Coax Fiber Coax x HFC {FTTx ; x= Curb, Node, Building} FTTP (premise) {PON,WDM} 
  26. Wireless backhaul using Ethernet (Radio Access Networks –RAN) • Wi-Fi, WIMAX – EoMPLS • GSM – EoSDH CES E-LINE 2, 2.5G 3G WIMAX TDM (E1) ATM Ethernet,IP
  27. Metro Ethernet Technology
  28. Types of Networks; 1. Local Area Network (LAN) 2.Wide Area Network (WAN) 3.Metropolitan Area Network (MAN) 
  29. Local Area Networks (LAN) •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. 
  30. Wide Area Networks (WAN) • 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
  31. 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 
  32. L1, L2 • Connection Oriented • Circuit Switched Ex:-TDM, ATM, FR • FR and ATM have a VC identifier (VCI/VPI Virtual Channel Identifier/Virtual Path Identifier). Therefore, we do not have to create labels.
  33. L3 • Connectionless • Packet Switched Ex:-IP 
  34. L2 & L3 • Traffic is switched • Control signal is routed Ex:-IP/MPLS • Ethernet does not have a label. Therefore, we have to create labels. We use MPLS. 
  35. 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 maintain
  36. Ethernet over MPLS over Ethernet IP .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 Traffic 
  37. The world of headers 
  38. Ethernet frame: Get me to the other side RSVP-TE signaling B D LDP signaling session (TCP port 646) A 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
  39. Redundancy 
  40. Redundancy Protection Restoration (before *) (after *) Global Local Global Local Ex: standby LSP Ex: Secondary Ex: Detour LSP LSP in FRR * failure 
  41. 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 1 B D 2 A 3 E C Primary Path Secondary Path Detour Path
  42. RSVP + CSPF (=OSPF-TE) RSVP - TE FRR 
  43. QoS • Latency (delay) SLA • Jitter (variation in delay) • Packet loss