Metro Ethernet Concepts

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Information about Metro Ethernet Concepts

Published on November 19, 2009

Author: udunuwara



Agenda2  ME concepts  ME technology (c) Anuradha Udunuwara

3 ME concepts (c) Anuradha Udunuwara

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 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

Attributes6 Source: MEF ( (c) Anuradha Udunuwara

ME drivers7 1. Simplicity 2. Any transport (c) Anuradha Udunuwara

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

ME9 Wired Wireless (c) Anuradha Udunuwara

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 E-Line E-LAN  Ethernet Private Line (EPL) E-Tree  Ethernet Virtual Private Line (EVPL) (c) Anuradha Udunuwara

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

L2 Switch vs. Metro Ethernet Network (MEN)13 L2 Switch (c) Anuradha Udunuwara

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

L2 switching15  Media Access Control (MAC) based  VLAN based (c) Anuradha Udunuwara

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

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

Broadcasting18  Ex:- server advertises its presence to the clients Single Client Client broadcast domain L2 Switch (flood) Server (broadcast) (c) Anuradha Udunuwara

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

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

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

MPLS22  IP/MPLS is one of the ways to path engineer an Ethernet frame Service MPLS Transport (c) Anuradha Udunuwara

EoMPLS (Ethernet over MPLS)23  Port based  VLAN based (c) Anuradha Udunuwara

Transport MPLS (T-MPLS)24  Started as MPLS-TP (Transport Profile)  T-MPLS = IP/MPLS - IP (c) Anuradha Udunuwara

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

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

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

ME Technology

Types of Networks29 1.Local Area Network (LAN) 2.Wide Area Network (WAN) 3.Metropolitan Area Network (MAN) (c) Anuradha Udunuwara

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

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

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

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

L334  Connectionless  Packet Switched Ex:-IP (c) Anuradha Udunuwara

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

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

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

The world of headers38 (c) Anuradha Udunuwara

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

Redundancy40 Protection Restoration (before *) (after *) Global Local Global Local Ex: standby LSP Ex: Secondary Ex: Detour LSP LSP in FRR * failure (c) Anuradha Udunuwara

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

RSVP + CSPF (=OSPF-TE)42 RSVP - TE FRR (c) Anuradha Udunuwara

QoS43  Latency (delay)  Jitter (variation in delay) SLA  Packet loss (c) Anuradha Udunuwara

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

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