draft-ietf-mpls-tp-aps-updates-03.txt   draft-ietf-mpls-tp-aps-updates-04.txt 
MPLS Working Group J. Ryoo MPLS Working Group J. Ryoo
Internet-Draft T. Cheung Internet-Draft T. Cheung
Updates: 7271 (if approved) ETRI Updates: 7271 (if approved) ETRI
Intended status: Standards Track H. van Helvoort Intended status: Standards Track H. van Helvoort
Expires: August 25, 2017 Hai Gaoming BV Expires: December 5, 2017 Hai Gaoming BV
I. Busi I. Busi
G. Wen G. Wen
Huawei Technologies Huawei Technologies
February 21, 2017 June 3, 2017
Updates to MPLS Transport Profile (MPLS-TP) Linear Protection in Updates to MPLS Transport Profile (MPLS-TP) Linear Protection in
Automatic Protection Switching (APS) Mode Automatic Protection Switching (APS) Mode
draft-ietf-mpls-tp-aps-updates-03.txt draft-ietf-mpls-tp-aps-updates-04.txt
Abstract Abstract
This document contains updates to MPLS Transport Profile (MPLS-TP) This document contains updates to MPLS Transport Profile (MPLS-TP)
linear protection in Automatic Protection Switching (APS) mode linear protection in Automatic Protection Switching (APS) mode
defined in RFC 7271. The updates provide rules related to the defined in RFC 7271. The updates provide rules related to the
initialization of the Protection State Coordination (PSC) Control initialization of the Protection State Coordination (PSC) Control
Logic, in which the state machine resides, when operating in APS Logic, in which the state machine resides, when operating in APS
mode, and clarify some operation related to state transition table mode, and clarify some operation related to state transition table
lookup. lookup.
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Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet- working documents as Internet-Drafts. The list of current Internet-
Drafts is at http://datatracker.ietf.org/drafts/current/. Drafts is at http://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress." material or to cite them other than as "work in progress."
This Internet-Draft will expire on August 25, 2017. This Internet-Draft will expire on December 5, 2017.
Copyright Notice Copyright Notice
Copyright (c) 2017 IETF Trust and the persons identified as the Copyright (c) 2017 IETF Trust and the persons identified as the
document authors. All rights reserved. document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info) in effect on the date of (http://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents publication of this document. Please review these documents
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"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in RFC 2119 [RFC2119]. document are to be interpreted as described in RFC 2119 [RFC2119].
3. Acronyms 3. Acronyms
This document uses the following acronyms: This document uses the following acronyms:
APS Automatic Protection Switching APS Automatic Protection Switching
DNR Do-not-Revert DNR Do-not-Revert
E::R Exercise state due to remote EXER message E::R Exercise state due to remote EXER message
EXER Exercise EXER Exercise
i ignore
MS-P Manual Switch to Protection path MS-P Manual Switch to Protection path
MS-W Manual Switch to Working path MS-W Manual Switch to Working path
MPLS-TP MPLS Transport Profile MPLS-TP MPLS Transport Profile
N Normal state
NR No Request NR No Request
PF:DW:R Protecting Failure state due to remote SD-W message PF:DW:R Protecting Failure state due to remote SD-W message
PF:W:L Protecting Failure state due to local SF-W PF:W:L Protecting Failure state due to local SF-W
PF:W:R Protecting Failure state due to remote SF-W message PF:W:R Protecting Failure state due to remote SF-W message
PSC Protection State Coordination PSC Protection State Coordination
RR Reverse Request RR Reverse Request
SA:MP:R Switching Administrative state due to remote MS-P message
SA:MW:R Switching Administrative state due to remote MS-W message
SD Signal Degrade SD Signal Degrade
SF-P Signal Fail on Protection path SF-P Signal Fail on Protection path
SF-W Signal Fail on Working path SF-W Signal Fail on Working path
UA:P:L Unavailable state due to local SF-P UA:P:L Unavailable state due to local SF-P
WTR Wait-to-Restore WTR Wait-to-Restore
4. Updates 4. Updates
This section specifies the actions that will be performed at the This section specifies the actions that will be performed at the
initialization of the PSC Control Logic and the modifications of the initialization of the PSC Control Logic and the modifications of the
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The changes in two rows of remote protecting failure states lead to The changes in two rows of remote protecting failure states lead to
the replacement of note (10) with DNR, therefore note (10) is no the replacement of note (10) with DNR, therefore note (10) is no
longer needed. The resultant three rows read: longer needed. The resultant three rows read:
| MS-W | MS-P | WTR | EXER | RR | DNR | NR | MS-W | MS-P | WTR | EXER | RR | DNR | NR
--------+---------+---------+-----+------+----+------+---- --------+---------+---------+-----+------+----+------+----
N | SA:MW:R | SA:MP:R | (13)| E::R | i | DNR | i N | SA:MW:R | SA:MP:R | (13)| E::R | i | DNR | i
PF:W:R | SA:MW:R | SA:MP:R | (9) | E::R | i | DNR | (11) PF:W:R | SA:MW:R | SA:MP:R | (9) | E::R | i | DNR | (11)
PF:DW:R | SA:MW:R | SA:MP:R | (9) | E::R | i | DNR | (11) PF:DW:R | SA:MW:R | SA:MP:R | (9) | E::R | i | DNR | (11)
In the tables above, the letters 'i' and 'N' stand for "ignore" and
"Normal state", respectively. Other acronyms can be found in
Section 3.
4.3. Operation related to State Transition Table Lookup 4.3. Operation related to State Transition Table Lookup
In addition to the rules related to the state transition table lookup In addition to the rules related to the state transition table lookup
listed in Section 11 of [RFC7271], the following rule is also applied listed in Section 11 of [RFC7271], the following rule is also applied
to the operation related to the state transition table lookup: to the operation related to the state transition table lookup:
o When the local SF-P is cleared and the priorities of the local and o When the local SF-P is cleared and the priorities of the local and
remote requests are re-evaluated, the last received remote message remote requests are re-evaluated, the last received remote message
may not be valid any more due to the previous failure of the may not be valid any more due to the previous failure of the
protection path. Therefore, the last received message MUST be protection path. Therefore, the last received message MUST be
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