Carrier Ethernet:  User to Network Interface (UNI)   Network-to-Network Interfaces (E-NNI) and End-to-End OAM Arie Goldber...
Agenda <ul><li>Carrier Ethernet Services and Challenges </li></ul><ul><ul><li>Carrier Ethernet (CE) MEF defined Services <...
Carrier Ethernet Services and Challenges
Carrier Ethernet’s “Evolution”  <ul><li>Basic Ethernet Access Services definition </li></ul><ul><li>From Metro to Regional...
Demand Drivers – Services and Bandwidth On-line Government   Education Remote learning Healthcare date & Tele-medicine Com...
The MEF 5-Attributes of Carrier Ethernet <ul><li>Carrier Ethernet is a ubiquitous, standardized,  carrier-class  SERVICE  ...
MEF defined Basic CE Services E-LINE EPL: Private Line EVPL: Virtual Private Line E-LAN EP-LAN: Private LAN EVP-LAN: Virtu...
Global Services crossing carrier boundaries Carrier A Service Provider Carrier C Access Provider Carrier B Transport Provi...
Some of the Challenges of CE Service Providers <ul><li>Turn-up services quickly and efficiently – be competitive, get reve...
Carrier Ethernet Network Basics
Carrier Ethernet Demarcation Points <ul><li>UNI - User-to-Network Interface </li></ul><ul><ul><li>Demarcation point betwee...
Carrier Ethernet Service <ul><li>Access Network Provider  </li></ul><ul><ul><li>Provides CEVC 1  connection between Subscr...
Network Interface Device (NID) <ul><li>A device that provides the point of demarcation between an operator ans a subscribe...
Global Services crossing carrier boundaries Challenge: How to install quickly, run reliably, operate efficiently and deliv...
Link and Service OAMs
OAM Layer Components <ul><li>Each layer supports OAM capabilities independently </li></ul><ul><li>OAMs interoperate  </li>...
Link Fault Management OAM <ul><li>Link OAM - IEEE 802.3ah – Per link (point-to-point): </li></ul><ul><ul><li>Link monitori...
E2E Service OAM – Maintenance Associations <ul><li>Maintenance Association (MA) – Boundaries of an Administrator’s scope o...
E2E Service OAM - Hierarchical Domains <ul><li>A flat network is difficult to manage and define accountabilities </li></ul...
Ethernet Service Connectivity Fault Management <ul><li>IEEE 802.1ag for EVC Connectivity Fault Management </li></ul><ul><u...
Ethernet Service Continuity Check Access Network Metro Aggregation Network Access Network IP/MPLS Core Network Metro Aggre...
Ethernet Link Trace Access Network Metro Aggregation Network Access Network IP/MPLS Core Network Metro Aggregation Network...
Service Performance Management <ul><li>Key Metrics </li></ul><ul><ul><li>Frame/Packet Delay – Latency (e.g. UNI/UNI 30ms@9...
Interfaces and Ethernet Virtual Circuits Point-to-Point EVC Carrier A E-NNI UNI Multi-point to  Multi-point EVC UNI UNI Po...
Summary <ul><li>New Protocol Solutions </li></ul><ul><ul><li>Point-to-Point  Link OAM  (802.3ah) </li></ul></ul><ul><ul><l...
Wholesale Logistics
Global Services Directory Summary <ul><li>Business Users </li></ul><ul><ul><li>Find Carrier Ethernet services anywhere in ...
Global Services Directory Summary <ul><li>Business Users </li></ul><ul><ul><li>Find Carrier Ethernet services anywhere in ...
Global Services Directory Project Review <ul><li>MEF worked with Heavy Reading to develop up-to-date database of Ethernet ...
Service Provider Participants Service Provider and Cable MSO Members <ul><li>Sprint </li></ul><ul><li>Suddenlink </li></ul...
Wholesale Access Interconnection Group Charter: Define Standard template and procedure for ordering wholesale Ethernet ser...
WAIG Template <ul><li>Physical Customer Interfaces </li></ul><ul><ul><li>For different services (UNI and NNI) provide phys...
WAIG Template (cont.) <ul><li>Network Management </li></ul><ul><ul><li>Maintenance Points for Fault, Performance OAM optio...
WAIG Status <ul><li>Draft is being posted for MEF membership review </li></ul><ul><li>“ Trial run” Access Providers to fil...
Carrier Ethernet’s “Evolution”  LAN WAN OOF WAN MAN Finish E-NNI Finish NID Refine GS Directory – add SPs Release WAIG Tem...
Thank You  Presentations are available at www.metroethernetforum.org
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  • Traditional Private Lease Line and Private Virtual Connection (PVC) are provided through T1/T3 or SONET/SHD access loops. They are complicated, costly, somewhat slow and not very scalable. They do offer very consistent and reliable performances, and have built-in OAM for fault detection and management.
  • Traditional Private Lease Line and Private Virtual Connection (PVC) are provided through T1/T3 or SONET/SHD access loops. They are complicated, costly, somewhat slow and not very scalable. They do offer very consistent and reliable performances, and have built-in OAM for fault detection and management.
  • Tom Franklin Leading Asking for continued and additional participant; perhaps sub-team leader Input of parameters by August 17; meeting by 8/24 Not limited to telecom, Wholesale arm of Cable COs Processes include not only ordering, also monitoring and maint
  • MainEnd-to-End_OAM_E-NNI 2.0.ppt

    1. 1. Carrier Ethernet: User to Network Interface (UNI) Network-to-Network Interfaces (E-NNI) and End-to-End OAM Arie Goldberg, CEO, Omnitron System Technology, Inc. Board Member, Metro Ethernet Forum
    2. 2. Agenda <ul><li>Carrier Ethernet Services and Challenges </li></ul><ul><ul><li>Carrier Ethernet (CE) MEF defined Services </li></ul></ul><ul><ul><li>CE Service Provider challenges </li></ul></ul><ul><li>Ethernet Services Network Basics </li></ul><ul><ul><li>Demarcation Points - Definition of UNI and E-NNI </li></ul></ul><ul><ul><li>Anatomy of Ethernet Service </li></ul></ul><ul><li>Link and Service OAM </li></ul><ul><ul><li>OAM Hierarchies, Components and Protocols </li></ul></ul><ul><ul><li>Link and Service OAMs </li></ul></ul><ul><li>Wholesale Logistics </li></ul><ul><ul><li>Global Services Directory </li></ul></ul><ul><ul><li>Wholesale Access Template </li></ul></ul>
    3. 3. Carrier Ethernet Services and Challenges
    4. 4. Carrier Ethernet’s “Evolution” <ul><li>Basic Ethernet Access Services definition </li></ul><ul><li>From Metro to Regional Services </li></ul><ul><li>From Regional to National Services </li></ul><ul><li>From National to International / Global Services </li></ul><ul><li>From Intra-Provider (In-franchise/IF) to Inter-Provider (out-of-franchise/OOF) Services </li></ul>1999, Europe: First Metro Ethernet LAN WAN OOF WAN MAN
    5. 5. Demand Drivers – Services and Bandwidth On-line Government Education Remote learning Healthcare date & Tele-medicine Commerce, On-line Business, Tele-workers, On-line Financial Services, On-line NEW tools! Apps! Backhaul Apps $$ $$ $$ $$ $$ $$ $$ $$ VoIP VoD IPTV E-Line E-LAN) Low CAPEX Low OPEX Low Cost to Subscribers
    6. 6. The MEF 5-Attributes of Carrier Ethernet <ul><li>Carrier Ethernet is a ubiquitous, standardized, carrier-class SERVICE defined by five attributes that distinguish Carrier Ethernet from familiar LAN based Ethernet </li></ul><ul><li>It brings the compelling business benefit of the Ethernet cost model to achieve significant savings </li></ul>Carrier Ethernet <ul><li>Scalability </li></ul><ul><li>Standardized Services </li></ul><ul><li>Service Management </li></ul><ul><li>Quality of Service </li></ul><ul><li>Reliability </li></ul>Carrier Ethernet Attributes
    7. 7. MEF defined Basic CE Services E-LINE EPL: Private Line EVPL: Virtual Private Line E-LAN EP-LAN: Private LAN EVP-LAN: Virtual Private LAN Point to Point Site2Site L2 VPNs E-TREE EP-Tree: Private Tree EVP-Tree: Virtual Private Tree Point to Multi-Point Broadcasting Services Triple Play backhaul Mobile backhaul Multi-Point to Multi-Point Multi-Site L2 VPNs Transparent LANs Point-to-Point EVC CPE UNI UNI CPE CPE UNI CPE UNI Multipoint EVC Rooted Multipoint EVC CPE UNI CPE UNI CPE UNI
    8. 8. Global Services crossing carrier boundaries Carrier A Service Provider Carrier C Access Provider Carrier B Transport Provider E-NNI Multi-point to Multi-point EVC UNI UNI UNI UNI UNI E-NNI
    9. 9. Some of the Challenges of CE Service Providers <ul><li>Turn-up services quickly and efficiently – be competitive, get revenues ASAP </li></ul><ul><li>On/Off-Net services – meet global customer needs - buy and sell / wholesale with other providers - generate revenue on and off-net </li></ul><ul><li>Reliability/Up-time (99.999%) - enable high value services with SLAs for higher rate revenues </li></ul><ul><li>Quality – build customer satisfaction – increase customer retention – keep revenues coming </li></ul><ul><li>Efficient operation - keep OpEx costs down – be competitive and profitable </li></ul>
    10. 10. Carrier Ethernet Network Basics
    11. 11. Carrier Ethernet Demarcation Points <ul><li>UNI - User-to-Network Interface </li></ul><ul><ul><li>Demarcation point between </li></ul></ul><ul><ul><ul><li>Ethernet Service Provider/Access Network Provider and Subscriber </li></ul></ul></ul><ul><ul><li>Ethernet Service / Ethernet Virtual Connection (EVC) starting / ending point </li></ul></ul><ul><li>E-NNI - External Network-to-Network Interface </li></ul><ul><ul><li>Demarcation point between: </li></ul></ul><ul><ul><ul><li>Ethernet Service Provider and Access Network Provider </li></ul></ul></ul><ul><ul><ul><li>Ethernet Access Provider and Transport Network Provider </li></ul></ul></ul><ul><li>EVC - Ethernet Virtual Connection </li></ul><ul><ul><li>Ethernet service connecting between 2 or more UNIs </li></ul></ul>E-NNI Access Network Provider Transport Network Provider Ethernet Service Provider Subscriber Subscriber E-NNI E-NNI UNI UNI EVC
    12. 12. Carrier Ethernet Service <ul><li>Access Network Provider </li></ul><ul><ul><li>Provides CEVC 1 connection between Subscriber UNI 1 (RUNI) and VUNI 1 at E-NNI 1 with Transport Network Provider </li></ul></ul><ul><li>Transport Network Provider </li></ul><ul><ul><li>Provides CEVC 2 connection between E-NNI 1 (VUNI 2 ) and E-NNI 2 (VUNI 3 ) with Ethernet Service Provider </li></ul></ul><ul><li>Ethernet Service Provider </li></ul><ul><ul><li>Provides connection to E-NNI 2 with Transport Network Provider </li></ul></ul><ul><ul><li>Provides End-to-End Ethernet Service to Subscriber </li></ul></ul><ul><ul><ul><li>Provides EVC between UNI 1 and UNI 2 </li></ul></ul></ul>E-NNI Transport Network Provider Ethernet Service Provider Access Network Provider RUNI VUNI 1 VUNI 2 and VUNI 3 Subscriber Subscriber UNI 2 UNI 1 Transit Tunnel Terminating Tunnel EVC E-NNI 1 E-NNI 2 CEVC 1 CEVC 2
    13. 13. Network Interface Device (NID) <ul><li>A device that provides the point of demarcation between an operator ans a subscriber </li></ul><ul><li>UNI-N functions are partitioned between the NID and the Network Edge device </li></ul><ul><li>Provides the physical interface to the subscriber (fiber, copper) </li></ul><ul><li>Owned by the Operator / Service Provider </li></ul><ul><li>managed by Operator / Service Provider </li></ul><ul><li>Provides fault and performance management for E2E services </li></ul><ul><li>Complex device </li></ul>Service Provider Network Operator Network E-NNI UNI UNI CE CE NID NID
    14. 14. Global Services crossing carrier boundaries Challenge: How to install quickly, run reliably, operate efficiently and deliver SLA ============================================= $$ / €€ /££ Carrier A Service Provider Carrier C Access Provider Carrier B Transport Provider E-NNI Multi-point to Multi-point EVC UNI UNI UNI UNI UNI E-NNI
    15. 15. Link and Service OAMs
    16. 16. OAM Layer Components <ul><li>Each layer supports OAM capabilities independently </li></ul><ul><li>OAMs interoperate </li></ul><ul><li>Component responsibilities are complementary </li></ul>E2E Performance Monitoring E2E Fault Monitoring P2P Link Fault Management
    17. 17. Link Fault Management OAM <ul><li>Link OAM - IEEE 802.3ah – Per link (point-to-point): </li></ul><ul><ul><li>Link monitoring -- Remote loopback </li></ul></ul><ul><ul><li>Remote failure indication -- Loopback Control </li></ul></ul><ul><ul><li>Good for single links, but does not monitor across EVC </li></ul></ul>802.3ah 802.3ah 802.3ah 802.3ah 802.3ah 802.3ah 802.3ah 802.3ah 802.3ah Ethernet Link Fault Management performed by Carrier Ethernet network elements and NIDs NID NID UNI UNI E-NNI
    18. 18. E2E Service OAM – Maintenance Associations <ul><li>Maintenance Association (MA) – Boundaries of an Administrator’s scope of monitoring part of the network </li></ul><ul><li>Maintenance Domain (MD) – A level of monitoring within the hierarchy </li></ul><ul><li>Maintenance End Points (MEP) – End Points of the MA or MD </li></ul><ul><li>Maintenance Intermediate Points (MIP) – Intermediate Points within MA or MD </li></ul>
    19. 19. E2E Service OAM - Hierarchical Domains <ul><li>A flat network is difficult to manage and define accountabilities </li></ul><ul><li>Hierarchical Maintenance Domains defines OAM Flows & OAM responsibilities </li></ul>Network OAM Service OAM Customer Domain Provider Domain Operator Domain Operator Domain Customer Customer Service Provider UNI UNI E-NNI
    20. 20. Ethernet Service Connectivity Fault Management <ul><li>IEEE 802.1ag for EVC Connectivity Fault Management </li></ul><ul><ul><li>For Protection/Restoration </li></ul></ul><ul><ul><ul><li>Connectivity Check Messages (CCMs) for heartbeats </li></ul></ul></ul><ul><ul><li>For diagnostic purposes </li></ul></ul><ul><ul><ul><li>Connectivity Check (Layer 2 Ping), Link Trace, Loopbacks </li></ul></ul></ul><ul><li>CCMs initiated between: </li></ul><ul><ul><li>Management Endpoints (MEPs / UNIs) </li></ul></ul><ul><ul><li>Management Intermediate Points (MIPs / NNIs) </li></ul></ul><ul><ul><li>Management Endpoints and Intermediate Points (UNI-NNI) </li></ul></ul>Connectivity Fault Management provided by Carrier Ethernet network elements and NIDs
    21. 21. Ethernet Service Continuity Check Access Network Metro Aggregation Network Access Network IP/MPLS Core Network Metro Aggregation Network Maintenance Association (MA) MEP#1 MEP #2 MIP MIP MEP #2 Report on CC fault if no CCMs are received from MEP #1 for 30ms MIP MIP MIP MIP UNI UNI MEP #2 CCMs sent every 10ms Check for CCMs received from MEP #1 Ethernet continuity check is analogous to IP’s Ping but does much more MEP #1 No CCMs received from MEP #2 within 30ms (3 x 10ms) MEP #1 Send CCMs with RDI flag set MEP #2 Remote alarm detected by received RDI Report alarm to management system MEP #2 Initiate protection switchover MEP #1 CCMs sent every 10ms on working/protect paths Check for CCMs received from MEP #2 on working/protect paths MEP #1 Report CC fault to management system
    22. 22. Ethernet Link Trace Access Network Metro Aggregation Network Access Network IP/MPLS Core Network Metro Aggregation Network Link trace Reply UNI UNI Ethernet Link Trace is analogous to IP’s Traceroute MEP MEP MIP MIP MIP MIP
    23. 23. Service Performance Management <ul><li>Key Metrics </li></ul><ul><ul><li>Frame/Packet Delay – Latency (e.g. UNI/UNI 30ms@99.9%@15min) </li></ul></ul><ul><ul><li>Frame/Packet Delay Variation – Jitter (e.g. 10ms@99.9%@15min) </li></ul></ul><ul><ul><li>Frame/Packet Loss Ratio (e.g. CIR FL=1%@15min) </li></ul></ul><ul><ul><li>Service Availability (e.g. 99.99%@30days) </li></ul></ul><ul><li>ITU-T has defined measurement framework/metrics for items 1-3 </li></ul><ul><ul><li>IP packet-based measurements </li></ul></ul><ul><ul><li>ITU-T Y.1731 defines how to use 802.1ag to measure performance </li></ul></ul><ul><li>MEF has defined measurement framework for items 1-4 </li></ul><ul><ul><li>Ethernet Frame-based measurements </li></ul></ul><ul><ul><li>MEF 10.1 defines formulae for metrics calculation </li></ul></ul>The combination of IEEE 802.1ag, ITU-T Y.1731 and MEF 10.1 define Ethernet service performance
    24. 24. Interfaces and Ethernet Virtual Circuits Point-to-Point EVC Carrier A E-NNI UNI Multi-point to Multi-point EVC UNI UNI Point-to-Point EVC UNI UNI UNI Link OAM 802.3ah E2E Service OAM: Fault-802.1ag Perform-Y.1731 Carrier B
    25. 25. Summary <ul><li>New Protocol Solutions </li></ul><ul><ul><li>Point-to-Point Link OAM (802.3ah) </li></ul></ul><ul><ul><li>End-to-End Service Connectivity Fault OAM (802.1ag) </li></ul></ul><ul><ul><li>End-to-End Service Performance Monitoring OAM (Y.1731) </li></ul></ul><ul><li>Enable quick turn-up – Acct acquisition/revenue </li></ul><ul><li>Increase reliability/up-time – Acct retention/revenue </li></ul><ul><li>Enables SLA commitments – Keep revenue </li></ul><ul><li>Enable efficient service operation / maintenance (man/machine/time/energy) – reduce OPEX </li></ul>
    26. 26. Wholesale Logistics
    27. 27. Global Services Directory Summary <ul><li>Business Users </li></ul><ul><ul><li>Find Carrier Ethernet services anywhere in the world. </li></ul></ul><ul><li>Service Providers </li></ul><ul><ul><li>Find a partner to build a global Carrier Ethernet service. </li></ul></ul><ul><li>Featuring </li></ul><ul><ul><li>Free access to interactive map driven system </li></ul></ul><ul><ul><li>Latest info on available services globally, locally </li></ul></ul><ul><ul><li>http://www.metroethernetforum.org/gsd </li></ul></ul>
    28. 28. Global Services Directory Summary <ul><li>Business Users </li></ul><ul><ul><li>Find Carrier Ethernet services anywhere in the world. </li></ul></ul><ul><li>Service Providers </li></ul><ul><ul><li>Find a partner to build a global Carrier Ethernet service. </li></ul></ul><ul><li>Featuring </li></ul><ul><ul><li>Free access to interactive map driven system </li></ul></ul><ul><ul><li>Latest info on available services globally, locally </li></ul></ul><ul><ul><li>http://www.metroethernetforum.org/gsd </li></ul></ul>
    29. 29. Global Services Directory Project Review <ul><li>MEF worked with Heavy Reading to develop up-to-date database of Ethernet Service Providers worldwide </li></ul><ul><ul><li>Identifies Carrier Ethernet services by city, country, and service application </li></ul></ul><ul><ul><li>Four phase project to: </li></ul></ul><ul><ul><ul><li>Cover MEF Service Providers with basic service and location information </li></ul></ul></ul><ul><ul><ul><li>Add more service providers and allow real time updates via Service Provider back-end </li></ul></ul></ul><ul><ul><ul><li>Provide in-depth service information, </li></ul></ul></ul><ul><ul><ul><li>Non-MEF Service Providers (TBD) </li></ul></ul></ul>
    30. 30. Service Provider Participants Service Provider and Cable MSO Members <ul><li>Sprint </li></ul><ul><li>Suddenlink </li></ul><ul><li>Swisscom </li></ul><ul><li>Symphony Communication </li></ul><ul><li>TATA Communications </li></ul><ul><li>Telecom Italia </li></ul><ul><li>Telekom Malaysia </li></ul><ul><li>Teliasonera AB </li></ul><ul><li>Telus </li></ul><ul><li>Time Warner Cable </li></ul><ul><li>Time Warner Telecom </li></ul><ul><li>T-Systems </li></ul><ul><li>Uecomm </li></ul><ul><li>Verizon Business </li></ul><ul><li>XO Communications </li></ul><ul><li>KDDI R&D Laboratories </li></ul><ul><li>KPN Telecom </li></ul><ul><li>Level 3 Communications </li></ul><ul><li>ntl: Telewest </li></ul><ul><li>NTT Advanced Technology </li></ul><ul><li>Optimum Lightpath </li></ul><ul><li>Orange Business Services </li></ul><ul><li>PCCW </li></ul><ul><li>PT Inovação </li></ul><ul><li>PT Prime </li></ul><ul><li>Qwest Communications </li></ul><ul><li>RCN Business Solutions </li></ul><ul><li>Reliance Communications </li></ul><ul><li>Shanghai Information Network </li></ul><ul><li>Singapore Telecom </li></ul><ul><li>AboveNet </li></ul><ul><li>Alpheus Communications </li></ul><ul><li>AT&T </li></ul><ul><li>Bell Canada </li></ul><ul><li>Bright House Networks </li></ul><ul><li>British Telecom </li></ul><ul><li>Cable & Wireless </li></ul><ul><li>Charter Communications </li></ul><ul><li>China Telecom </li></ul><ul><li>Cincinnati Bell </li></ul><ul><li>Colt </li></ul><ul><li>Comcast </li></ul><ul><li>Cox Business </li></ul><ul><li>Demand Broadband </li></ul><ul><li>Embarq </li></ul><ul><li>IPC </li></ul>
    31. 31. Wholesale Access Interconnection Group Charter: Define Standard template and procedure for ordering wholesale Ethernet services between service providers Objectives: To enable efficient communication of network capabilities between Service Providers and prospective wholesale partners
    32. 32. WAIG Template <ul><li>Physical Customer Interfaces </li></ul><ul><ul><li>For different services (UNI and NNI) provide physical interface options (fiber, copper, rates etc.) </li></ul></ul><ul><li>Path Diversity and Protection </li></ul><ul><ul><li>For topology and protocol options (xSTP etc.) </li></ul></ul><ul><li>Ethernet Frames </li></ul><ul><ul><li>Frame type and size options </li></ul></ul><ul><ul><li>Service multiplexing (EVCs etc.) options </li></ul></ul><ul><li>Performance and Class of Service (CoS) Requirements </li></ul><ul><ul><li>CoS options </li></ul></ul><ul><ul><li>Performance per CoS options </li></ul></ul><ul><li>Service Technology Questions </li></ul><ul><ul><li>Service / BW Profile options </li></ul></ul><ul><ul><li>Frame tagging options </li></ul></ul><ul><ul><li>Miscellaneous service (no other place) questions </li></ul></ul>
    33. 33. WAIG Template (cont.) <ul><li>Network Management </li></ul><ul><ul><li>Maintenance Points for Fault, Performance OAM options </li></ul></ul><ul><ul><li>OAM Protocol options </li></ul></ul><ul><ul><li>Administrative options </li></ul></ul><ul><ul><li>Wholesale partner administrative and logistical options </li></ul></ul><ul><li>Performance and SLA Reporting Capability </li></ul><ul><ul><li>On and Off-line performance reporting options </li></ul></ul><ul><li>Security </li></ul><ul><ul><li>Threat detection and defense options </li></ul></ul><ul><li>Connection Admission Control (CAC) Rules </li></ul><ul><ul><li>CoS traffic handling </li></ul></ul><ul><li>EVC and NNI Speeds </li></ul><ul><ul><li>Throughput information </li></ul></ul>
    34. 34. WAIG Status <ul><li>Draft is being posted for MEF membership review </li></ul><ul><li>“ Trial run” Access Providers to fill-out the draft template – expect comments </li></ul><ul><li>Implement comments </li></ul><ul><li>Initial publication – Q4 (Oct. 08) MEF meeting (Malta) </li></ul><ul><li>Early adaptors can start using Template now </li></ul>
    35. 35. Carrier Ethernet’s “Evolution” LAN WAN OOF WAN MAN Finish E-NNI Finish NID Refine GS Directory – add SPs Release WAIG Template 2008, Metro Ethernet We are here
    36. 36. Thank You Presentations are available at www.metroethernetforum.org

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