draft-ietf-mpls-tp-aps-updates-04v3.txt   draft-ietf-mpls-tp-aps-updates-04v3output.txt 
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1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Conventions Used in This Document . . . . . . . . . . . . . . 3 2. Conventions Used in This Document . . . . . . . . . . . . . . 3
3. Acronyms . . . . . . . . . . . . . . . . . . . . . . . . . . 3 3. Acronyms . . . . . . . . . . . . . . . . . . . . . . . . . . 3
4. Updates . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 4. Updates . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
4.1. Initialization Behavior . . . . . . . . . . . . . . . . . 4 4.1. Initialization Behavior . . . . . . . . . . . . . . . . . 4
4.2. State Transition Modification . . . . . . . . . . . . . . 5 4.2. State Transition Modification . . . . . . . . . . . . . . 5
4.3. Operation related to State Transition Table Lookup . . . 6 4.3. Operation related to State Transition Table Lookup . . . 6
5. Security Considerations . . . . . . . . . . . . . . . . . . . 7 5. Security Considerations . . . . . . . . . . . . . . . . . . . 7
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 7 6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 7
7. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 7 7. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 7
8. References . . . . . . . . . . . . . . . . . . . . . . . . . 8 8. References . . . . . . . . . . . . . . . . . . . . . . . . . 7
8.1. Normative References . . . . . . . . . . . . . . . . . . 8 8.1. Normative References . . . . . . . . . . . . . . . . . . 7
8.2. Informative References . . . . . . . . . . . . . . . . . 8 8.2. Informative References . . . . . . . . . . . . . . . . . 8
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 8 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 8
1. Introduction 1. Introduction
MPLS Transport Profile (MPLS-TP) linear protection in Automatic MPLS Transport Profile (MPLS-TP) linear protection in Automatic
Protection Switching (APS) mode is defined in RFC 7271 [RFC7271]. It Protection Switching (APS) mode is defined in RFC 7271 [RFC7271]. It
defines a set of alternate and additional mechanisms to perform some defines a set of alternate and additional mechanisms to perform some
of the functions of linear protection described in RFC 6378 of the functions of linear protection described in RFC 6378
[RFC6378]. The actions performed at initialization of the Protection [RFC6378]. The actions performed at initialization of the Protection
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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
treated as if it were NR and only the local request shall be treated as if it were NR and only the local request shall be
evaluated. evaluated.
The last paragraph in Section 11 of [RFC7271] is modified as follows: The last paragraph in Section 11 of [RFC7271] is modified as follows:
--------- Ol
Old text: --
--------- In
In the state transition tables below, the letter 'i' stands for "i
"ignore" and is an indication to remain in the current state and co
continue transmitting the current PSC message. Ne
--------- In
New text: gl
---------
In the state transition tables below, the letter 'i' is the
"ignore" flag, and if it is set it means that the top-priority
global request is ignored.
If re-evaluation is triggered, it is checked if the ignore flag is If re-evaluation is triggered, it is checked if the ignore flag is
set. If it is, the state machine will transit to the supposed state, set. If it is, the state machine will transit to the supposed state,
which can be Normal or DNR as indicated in the footnotes to the which can be Normal or DNR as indicated in the footnotes to the state
state transition tables. If the ignore flag is not set, the state transition tables. If the ignore flag is not set, the state machine
machine will transit to the state indicated in the cell of the state will transit to the state indicated in the cell of the state
transition table. transition table.
If re-evaluation is not triggered, it is checked if the ignore flag If re-evaluation is not triggered, it is checked if the ignore flag
is set. If it is, the state machine will remain in the current state, is set. If it is, the state machine will remain in the current
and the current PSC message continues to be transmitted. If the state, and the current PSC message continues to be transmitted. If
ignore flag is not set, the state machine will transit to the state the ignore flag is not set, the state machine will transit to the
indicated in the cell of the state transition table. state indicated in the cell of the state transition table.
5. Security Considerations 5. Security Considerations
No specific security issue is raised in addition to those ones No specific security issue is raised in addition to those ones
already documented in [RFC7271]. It may be noted that tightening the already documented in [RFC7271]. It may be noted that tightening the
description of initializing behavior may help to protect networks description of initializing behavior may help to protect networks
from re-start attacks. from re-start attacks.
6. IANA Considerations 6. IANA Considerations
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[RFC6378] Weingarten, Y., Ed., Bryant, S., Osborne, E., Sprecher, [RFC6378] Weingarten, Y., Ed., Bryant, S., Osborne, E., Sprecher,
N., and A. Fulignoli, Ed., "MPLS Transport Profile (MPLS- N., and A. Fulignoli, Ed., "MPLS Transport Profile (MPLS-
TP) Linear Protection", RFC 6378, DOI 10.17487/RFC6378, TP) Linear Protection", RFC 6378, DOI 10.17487/RFC6378,
October 2011, <http://www.rfc-editor.org/info/rfc6378>. October 2011, <http://www.rfc-editor.org/info/rfc6378>.
Authors' Addresses Authors' Addresses
Jeong-dong Ryoo Jeong-dong Ryoo
ETRI ETRI
EMail: ryoo@etri.re.kr Email: ryoo@etri.re.kr
Taesik Cheung Taesik Cheung
ETRI ETRI
EMail: cts@etri.re.kr Email: cts@etri.re.kr
Huub Van Helvoort Huub Van Helvoort
Hai Gaoming BV Hai Gaoming BV
EMail: huubatwork@gmail.com Email: huubatwork@gmail.com
Italo Busi Italo Busi
Huawei Technologies Huawei Technologies
EMail: Italo.Busi@huawei.com Email: Italo.Busi@huawei.com
Guangjuan Wen Guangjuan Wen
Huawei Technologies Huawei Technologies
EMail: wenguangjuan@huawei.com Email: wenguangjuan@huawei.com
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