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

Yang Yang

HealthingHearts@ieee.org

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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.

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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.

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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.

TPE_A SPE TPE_B

TPE_C

Customer_X Customer_X

Customer_YV2:

Add misconnect detecting function;

Define a new OAM PDU

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Next Step…

Performance Monitoring

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Thank you!

Your suggestions and/or comments are appreciated!

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Backup slides

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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_A TPE_B SPE_1 SPE_2

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What are the differences?

MS-OAM SS-OAM

Continuity, RDI

2-Levels Single Level

FDImisconnect detecting

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Two OAM Levels in MS-OAM

E2E

Segment 1 Segment 2 Segment 3 Segment

TPE_A TPE_B SPE_1 SPE_2

MS-OAM provides E2E level and Segment level. Each level has its own functions and traffic.

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How to Encode Level Indicator

Extend three OAM channels defined in [VCCV]:

1.Control Word

Reserve one bit in CW.

0: Segment Level; 1: E2E Level

2.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.

3.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.

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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.

E2E

Segment 1 Segment 2 Segment 3

FDISegment

TPE_A TPE_B SPE_1 SPE_2

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How to support FDI functions?

There are two protocols used for PW-OAM:

1.LSP Ping

2.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.

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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.

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What’s misconnection?

In this example customer X’s traffic is miss connected to customer Y in the intermediate SPE.

TPE_A SPE TPE_B

TPE_C

Customer_X

Customer_X

Customer_Y

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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.