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Connectivity Fault Management IEEE P802.1ag/D5.0September 5, 20051 19. Connectivity Fault Management Protocol(s)23 Figure 19-14BEGIN || ! MEPactive || ! AIGenabled5678AIG_IDLE9AIGwhile = 0;10UCT1112AIG_NO_FAILURE1314 AIGwhile = 0;15 someRMEPfailed1617AIG_TRANSMIT_1 AIG_TRANSMIT_218xmitAIS(); xmitAIS();19 AIGwhile = AIGinterval;! someRMEPfailed20! someRMEPfailed someRMEPfailed &&21 AIGwhile == 022Figure 19-1—EFF Alarm Indication Generator State Machine REVISED232425 Figure 19-22627 BEGIN || ! MEPactive282930 CCI_IDLE3132CCIenabled333435CCI_WAITING36xmitNormalCCM();37 CCIwhile = CCIinterval;38CCIenabled && ! CCIenabled39 (CCIwhile == 0)40CCI_TERMINATING_1 CCI_TERMINATING_241xmitTerminalCCM();xmitTerminalCCM();42CCIwhile = max(CCIinterval, 1 sec.); CCIwhile = max(CCIinterval, 1 sec.);43UCTCCIenabled && ! CCIenabled &&44CCIwhile == 0 CCIwhile == 04546Figure 19-2—IFF Continuity Check Initiator State Machine474849 Figure 19-35051 Figure 19-45253 Figure 19-554Copyright © 2005 IEEE. All rights reserved. 115This is an unapproved IEEE Standards Draft, subject to change.Connectivity Fault Management IEEE P802.1ag/D5.0September 5, 20051BEGIN || ! MEPactive || rMEPerrReset2345RMEPERR_IDLE6rCCMerror = false;7 rMEPerrWhile = 0;rMEPlastFailure = NULL;8UCT910RMEPERR_NO_FAILURE11errorCCMreceived = false;12 rMEPerrWhile = 0;rCCMerror = false;13errorCCMreceived141516 RMEPERR_FAILURE_DETECTerrorCCMreceived ...

Informations

• Publié par: Nujec
• Nombre de lectures: 17
• Langue: English

Extrait

Connectivity Fault Management

IEEE P802.1ag/D5.0

September 5, 2005

Copyright © 2005 IEEE. All rights reserved.

115

This is an unapproved IEEE Standards Draft, subject to change.

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19. Connectivity Fault Management Protocol(s)

Figure 19-1

Figure 19-2

Figure 19-3

Figure 19-4

Figure 19-5

Figure 19-1—EFF Alarm Indication Generator State Machine

REVISED

BEGIN || ! MEPactive || ! AIGenabled

AIG_IDLE

AIG_TRANSMIT_1

xmitAIS();

AIGwhile = AIGinterval;

UCT

AIG_NO_FAILURE

someRMEPfailed &&

AIGwhile = 0;

! someRMEPfailed

AIGwhile == 0

AIGwhile = 0;

AIG_TRANSMIT_2

xmitAIS();

someRMEPfailed

! someRMEPfailed

Figure 19-2—IFF Continuity Check Initiator State Machine

BEGIN || ! MEPactive

CCI_IDLE

CCI_WAITING

CCIenabled &&

xmitNormalCCM();

CCIwhile = CCIinterval;

CCI_TERMINATING_1

! CCIenabled &&

xmitTerminalCCM();

CCIwhile = max(CCIinterval, 1 sec.);

CCIenabled

(CCIwhile == 0)

! CCIenabled

CCI_TERMINATING_2

UCT

xmitTerminalCCM();

CCIwhile = max(CCIinterval, 1 sec.);

CCIwhile == 0

CCIenabled &&

CCIwhile == 0

Connectivity Fault Management

IEEE P802.1ag/D5.0

September 5, 2005

116

Copyright © 2005 IEEE. All rights reserved.

This is an unapproved IEEE Standards Draft, subject to change.

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Figure 19-6

Figure 19-3—IFF Remote MEP Error State Machine

NEW

BEGIN || ! MEPactive || rMEPerrReset

RMEPERR_IDLE

UCT

rCCMerror = false;

rMEPerrWhile = 0;

RMEPERR_NO_FAILURE

errorCCMreceived = false;

rMEPerrWhile = 0;

RMEPERR_FAILED

errorCCMreceived = false;

rMEPerrWhile = max (rMEPerrWhile, recvdLifetime);

errorCCMreceived

rMEPerrWhile == 0

rMEPlastFailure = NULL;

rCCMerror = false;

RMEPERR_FAILURE_DETECT

errorCCMreceived = false;

rMEPlastFailure = recvdFrame;

rCCMerror = true;

SendFailureAlarm();

UCT

errorCCMreceived &&

rMTPerrWhile != 0

rMEPlastFailure = recvdFrame;

Figure 19-4—IFF Remote MEP State Machine

REVISED

BEGIN || ! MEPactive

RMEP_IDLE

UCT

rMEPok = true;

rMEPwhile = 0;

normalCCMreceived = false;

RMEP_OK

normalCCMreceived &&

rMEPwhile == 0

rMEPok = true;

CCMnotifyAIS = true;

rMEPwhile = rMEPstartTime;

rMEPwhile != 0

rMEPmacAddress = recvdMacAddress;

rMEPok = false;

RMEP_FAILED

normalCCMreceived

Connectivity Fault Management

IEEE P802.1ag/D5.0

September 5, 2005

Copyright © 2005 IEEE. All rights reserved.

117

This is an unapproved IEEE Standards Draft, subject to change.

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Figure 19-7

Figure 19-8

Figure 19-9

Figure 19-5—IFF Alarm Indication Signal Receiver State Machine

REVISED

BEGIN || ! MEPactive

RIAS_IDLE

UCT

rAISsuppressed = false;

rAISerrWhile = 0;

RIAS_NO_DEFECT

rAISreceived = false;

rAISreceived

rAISwhile == 0

RIAS_DETECT

rAISreceived = false;

rAISerrWhile = 3.5 sec;

rAISreceived &&

rAISwhile != 0

rAISerrWhile = 0;

rAISsuppressed = true;

Figure 19-7—IFF Linktrace Initiator State Machine

BEGIN || ! MEPactive

LTI_WAITING

LTI_IDLE

LTIactive &&

LTIactive = false;

LTI_RECEIVE_AFTER

recvdLTR = false;

recvdLTR &&

! LTIactive ||

UCT

LTI_STARTING

UCT

LTIwhile = 5;

expectedLTRtransID = nextLTMtransID;

xmitLTM();

LTI_RECEIVE_BEFORE

recvdLTR = false;

UCT

recvdLTR

! recvdLTR

LTIactive &&

(LTIwhile != 0)

(LTIwhile == 0)

Connectivity Fault Management

IEEE P802.1ag/D5.0

September 5, 2005

Copyright © 2005 IEEE. All rights reserved.

118

This is an unapproved IEEE Standards Draft, subject to change.

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Figure 19-6—IFF Loopback Initiator State Machine

BEGIN || ! MEPactive

LBI_WAITING

LBI_IDLE

LBMsToSend &&

LBMsToSend = 0;

LBI_RECEIVE_DURING

recvdLBR = false;

LBIactive = false;

LBI_TRANSMITTING

(LBMsToSend != 0) &&

recvdLBR &&

LBMsToSend == 0

LBI_RECEIVE_AFTER

recvdLBR = false;

recvdLBR &&

UCT

LBI_TRANSMIT

xmitLBM();

nextLBMtransID += 1;

LBMsToSend -= 1;

LBIwhile = 5;

&& LBIactive

&& ! recvdLBR

! LBIactive ||

! LBIactive ||

(LBIwhile == 0)

UCT

UCT

LBI_STARTING

UCT

LBIwhile = 5;

LBIactive = true;

expectedLBRtransID = nextLBMtransID;

&& (LBIwhile != 0)

LBI_RECEIVE_BEFORE

recvdLBR = false;

UCT

recvdLBR

! recvdLBR

(LBIwhile == 0)

LBIactive &&

(LBIwhile != 0)

xmitReady && LBIactive &&

! recvdLBR && (LBIwhile != 0)

LBIactive &&

(LBIwhile != 0)

Connectivity Fault Management

IEEE P802.1ag/D5.0

September 5, 2005

Copyright © 2005 IEEE. All rights reserved.

119

This is an unapproved IEEE Standards Draft, subject to change.

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Figure 19-8—IFF Linktrace Forwarder State Machine

BEGIN || ! MEPactive

*

LTF_IDLE

LTF_TRANSMITTING

nPendingLTRs != 0

xmitOldestLTR();

nPendingLTRs -= 1;

UCT

LTF_WAITING

LTFwhile == 0

LTFwhile = 1;

clearPendingLTRs();

nPendingLTRs == 0

nPendingLTRs = 0;

*

MEPactive in a MEP; MIPactive in a MIP

Figure 19-9—Fault Alarm Generator State Machine

NEW

BEGIN || ! MEPactive

FG_IDLE

UCT

clearPendingLTRs();

FGwhile = 0;

FG_NO_REPORT

someDefect

FGwhile = 0;

FG_DEFECT

someDefect &&

FGwhile = 2.5 seconds;

FGwhile == 0

FG_REPORT_DEFECT

! someDefect

xmitFaultAlarm();

! someDefect

Connectivity Fault Management

IEEE P802.1ag/D5.0

September 5, 2005

120

Copyright © 2005 IEEE. All rights reserved.

This is an unapproved IEEE Standards Draft, subject to change.

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