Joint ITU-T/IEEE Workshop on Carrier-class Ethernet

Transcription

1 Joint ITU-T/IEEE Workshop on Carrier-class Ethernet Ethernet Access OAM & Management (EFM OAM and TPMR) David W. Martin Packet Optical Architect Nortel Networks Geneva, 31 May 01 June 007

2 Agenda Reference scenario TPMR overview EFM link OAM TPMR equipment & facility management Standards & references Geneva, 31 May 01 June 007 TPMR: Two-Port MAC Relay, P80.1aj EFM: Ethernet in the First Mile Link OAM: Clause 57 of Std 80.3 TM -005

3 Reference Scenario Carrier Network Service UNI Transport UNI 80.1ad Bridge Access Link (unprotected) TPMR (CLE) CPE Customer Link 10/100BASE-T customer link 100BASE-BX10 access link Any E-type service offering, TC at edge PB TPMR not service aware, physical demarc only Potential chain of TPMRs to extend reach Geneva, 31 May 01 June 007 CLE: Customer Located Equipment CPE: Customer Premise Equipment TC: Traffic Conditioning functions PB: Provider Bridge, Std 80.1ad TM -005

4 TPMR Overview Conformant to Std 80.1D TM -004, as modified by P80.1aj One Traffic Class on each Port ( Ports only) Remote management via one Port using RFC4789 Filtering of its management entity MAC address TPMR Port transmit/receive connectivity MAC status propagation protocol Low-MDL CFM No support for xstp, MRP Several options Geneva, 31 May 01 June 007 MDL: Maintenance Domain Level CFM: Connectivity Fault Mgmt, P80.1ag xstp: any Spanning Tree Protocol MRP: Multiple Registration Protocol, P80.3ak

5 Basic TPMR Model TPMR Management Entity LLC MS LLC MS Forwarding Process TPMR Port TX and RX Filtering Database TPMR Port TX and RX 80.n 80.n LAN LAN Geneva, 31 May 01 June 007 LLC: Logical Link Control MS: MAC Service : Internal Sublayer Service

6 Management Categories Service Facility Link(s) Equipment Not within the scope of this presentation P80.1aj calls out: RFC4789, CFM, MSPP EFM link OAM RFC4789, EFM link OAM Geneva, 31 May 01 June 007 MSPP: MAC Status Propagation Protocol

7 EFM Link OAM: Discovery Carrier Network Discovery Message (Active) 80.1ad Bridge Discovery Response (Passive) TPMR (CLE) CPE OAM Discovery protocol runs at start-up Exchanges each end s OAM capabilities: OAMPDU size Uni-directional Event notifications signalling Loopback Vendor / equipment / Variables response version identifiers Geneva, 31 May 01 June 007

8 EFM Link OAM: Loopback Carrier Network Test Pattern 80.1ad Bridge TPMR (CLE) CPE Intrusive loopback of all data frames Loopback occurs within OAM sublayer on the Port No DA/SA swap at loopback point PB receiving OAM sublayer discards all data frames OAMPDUs can still be sent over the link during test Event Notifications and critical Link Events Geneva, 31 May 01 June 007

9 EFM Link OAM: Event PDUs Four Event Notification OAMPDUs: Errored Symbol Period event Errored Frame event Errored Frame Period event Errored Frame Seconds Summary Three critical Link Event flags, in all OAMPDUs: Dying Gasp Link Fault Critical Event Geneva, 31 May 01 June 007

10 EFM Link OAM: Variables Retrieval Remote Ethernet statistics retrieval Uses 80.3 Annex 30A CMIP registration arcs Variable Request OAMPDU Descriptor Branch Leaf structure Request a count like aoctetsreceivedok Variable Response OAMPDU Container Branch Leaf Width Value structure Could be used as a non-intrusive ping (~loopback) between OAM sublayers Geneva, 31 May 01 June 007 CMIP: Common Management Information Protocol

11 P80.1aj and RFC4789 P80.1aj calls out RFC4789: SNMP over 80 Recommends using SNMPv3 for security benefits Can provision (SET) the TPMR MIB and each Interface MIB for the two Ports Can retrieve (GET) any MIB objects/attributes MIBs are accessable from any point on the attached 80 network Geneva, 31 May 01 June 007

12 TPMR Management Entity Carrier Facing LLC MS TPMR Management Entity X Forwarding Process X LLC MS CPE Facing X Filtering Database X 80.n 80.n LAN LAN No connectivity between MS and Relay TPMR Management Entity s MAC address filtered Isolates Carrier-TPMR Management conversations Geneva, 31 May 01 June 007

13 CFM For Facility Connectivity Carrier Network EPL Service PEP C Comp CEP TPMR 1 3 CPE 0 0 Assuming no CPE support for CFM, Y.1731 Geneva, 31 May 01 June PEP: Provider Edge Port CEP: Customer Edge Port

14 Expanded TPMR Model TPMR Management Entity LLC MS Frame Filtering LLC MS (Up MEP) Up MEP Carrier Facing Up MHF Down MHF (Up MHF) (Down MHF) CPE Facing Queuing entities Support of the MAC service TPMR Port TX and RX Queuing entities Support of the MAC service TPMR Port TX and RX Down MEP 0 (Down MEP) EFM OAM sublayer 80.3 MS 80.3 MAC / PHY (EFM OAM sublayer) 80.3 MS 80.3 MAC / PHY Geneva, 31 May 01 June 007 LAN MHF: MIP Half Function LAN MEP: Maintenance association End Point MIP: Maintenance association Intermediate Point

15 CFM Non-Intrusive Loopback Carrier Network EPL Service PEP C Comp CEP TPMR 1 3 CPE LBM LBR 0 0 Covers data path of (almost) the entire facility Geneva, 31 May 01 June 007 LBM: Loopback Message LBR: Loopback Reply

16 CFM CCMs Carrier Network EPL Service X 1 PEP C Comp CEP X X 3 TPMR 1 3 CPE CCM CCM TLV 0 0 Network 1 or Access facility failure loss of CCMs Customer link 3 failure I/F Status TLV in CCM Geneva, 31 May 01 June 007 I/F: Interface CCM: Continuity Check Message

17 CPE Fault Notification Carrier Network EPL Service Transmitter Shutdown X 3 CPE X 1 PEP C Comp CEP X TPMR 1 3 Loss of CCMs or CCM TLV CPE 0 0 Loss of CCMs or a CCM w/ I/F Status TLV shuts TX Geneva, 31 May 01 June 007 TX: Transmitter

18 MAC Status Propagation Protocol (undesirable) Transmitter Shutdown Edge Bridge X TPMR TPMR TPMR Edge Bridge Private network scenario, TPMR chain for reach TPMRs managed via edge Bridges TPMR TX Shutdown would block management view MSPP fault notification allows management view Geneva, 31 May 01 June 007

19 MAC Status Propagation Protocol Edge Bridge A Doesn t RX Ack msg from Edge Bridge B Blip the link Edge Bridge B TPMR 1 TPMR TPMR 3 Link notification message: Group MAC DA, snoop & forward propagates through TPMRs stopped by first bridge sent at interval T r Ack msg Link notification message (Add / Loss) Ack msg T d Ack message: Group MAC DA, terminated each hop does not propagate through TPMRs single link applicability cancels timer T w at upstream TPMR Confirm message: unicast DA of source of Link notification msg propagates through TPMRs cancels timer T r at source of Link notif. msg sent when timer T w expires & link is blipped Geneva, 31 May 01 June 007 Confirm message (Add / Loss) MAC_Operational parameter

20 Standards and References IEEE Std 80.3 TM -005: EFM Link OAM tutorial: efm_oam_tutorial_004_03_31.pdf TPMR draft standard: aj-drafts/d/80-1aj-d-0.pdf MAC Status Propagation Protocol proposal: aj-seaman-status-propagation pdf Geneva, 31 May 01 June 007