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Update from Version 1 draft-dong-pwe3-mspw-oam-02.txt

Update from Version 1 draft-dong-pwe3-mspw-oam-02.txt. Yang Yang HealthingHearts@ieee.org. OAM capability Negotiation. V1:. Require 3 bit in CV Type Indicator field for MS-OAM 0x01 ICMP Ping (predefined in [VCCV]) 0x02 LSP Ping (predefined in [VCCV])

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Update from Version 1 draft-dong-pwe3-mspw-oam-02.txt

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  1. Update from Version 1 draft-dong-pwe3-mspw-oam-02.txt Yang Yang HealthingHearts@ieee.org

  2. OAM capability Negotiation V1: Require 3 bit in CV Type Indicator field for MS-OAM 0x01 ICMP Ping (predefined in [VCCV]) 0x02 LSP Ping (predefined in [VCCV]) 0x04 BFD for PW Fault Detection only (predefined in [VCCV]) 0x08 BFD for PW Fault Detection and AC/PW Fault Status Signaling (predefined in [VCCV]) 0x10 FDI 0x20 SEG OAM 0x40 E2E OAM Problems: The length of the field is 8 bit, which limit the number of OAM capability indication. V2: Reserve only 1 bit in CV type for MS-OAM. We suggest adding a new TLV indicating the OAM functions such as connectivity monitoring, fault notification and performance monitoring.

  3. Fault Notification V2: PW OAM should be detached from control plane. Add fault notification (FDI/RDI) functions and message format. Use 1 unused bit in CW to indicate the fault notification traffic. It’s suggested to add fault notification functions in BFD.

  4. Misconnection Detecting Misconnection is really unacceptable for customers. In this example customer X’s traffic is miss connected to customer Y in the intermediate SPE. Customer_X Customer_X TPE_A TPE_B SPE TPE_C Customer_Y V2: Add misconnect detecting function; Define a new OAM PDU

  5. Next Step… Performance Monitoring

  6. Thank you! Your suggestions and/or comments are appreciated!

  7. Backup slides

  8. Why we need MS-OAM A MS-PW will transit through multiple networks or domains. If the PW experience failure or performance degrade, we must know which network/domain cause the problem. TPE_B TPE_A SPE_1 SPE_2

  9. What are the differences?

  10. Two OAM Levels in MS-OAM MS-OAM provides E2E level and Segment level. Each level has its own functions and traffic. TPE_B TPE_A SPE_1 SPE_2 E2E Segment Segment 3 Segment 2 Segment 1

  11. How to Encode Level Indicator • Extend three OAM channels defined in [VCCV]: • Control Word • Reserve one bit in CW. • 0: Segment Level; 1: E2E Level • Router Alert • With this method, the E2E packets have to be processed at every intermediate node which will consume more resource, making this method not a preferred one. • TTL Expiry • Set the TTL value to the number of the hops/segments. But sometime it’s hard to get the detail of the hop info if the PW transmit across providers’ network.

  12. Why we need FDI Fast Protection: The router which detect the fault first will send FDI to the far end the MS-PW which may initiate protection switching processing immediately. Alarm Suppression: Eliminate duplicate alarms. TPE_B TPE_A SPE_1 SPE_2 E2E FDI Segment Segment 3 Segment 2 Segment 1

  13. How to support FDI functions? • There are two protocols used for PW-OAM: • LSP Ping • BFD None of them supports FDI. The method for sending FDI is described by draft-dong-pwe3-mspw-oam-02.txt. We think it’s necessary to add this functions in BFD and other OAM protocols used for PWE3.

  14. How to transmit RDI in MS-PW? In SS-PW, remote defect indication is sent via PW status TLV in control plane. In MS-PW, control plane may not exist. Under this circumstance, the remote defect indication can be sent via data plane. The method for sending RDI is described by draft-dong-pwe3-mspw-oam-02.txt. We think it’s necessary to add this functions in BFD and other OAM protocols used for PWE3.

  15. What’s misconnection? In this example customer X’s traffic is miss connected to customer Y in the intermediate SPE. Customer_X Customer_X TPE_A SPE TPE_B TPE_C Customer_Y

  16. How to detect misconnection? If the T-PE in the source end could send an OAM packet with its identifier to the sink end, misconnection could be detected. A new OAM PDU is defined for misconnection detecting in draft-dong-pwe3-mspw-oam-02.txt.

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