Internet DRAFT - draft-bardhan-spring-poi-sr-oam
draft-bardhan-spring-poi-sr-oam
SPRING Working Group Sanjoy Bardhan
Internet-Draft Madhukar Anand
Intended Status: Informational Ramesh Subrahmaniam
Infinera Corporation
Jeff Tantsura
Individual
Expires: June 25, 2017 December 22, 2016
OAM for Packet-Optical Integration in Segment Routing
draft-bardhan-spring-poi-sr-oam-01
Abstract
This document describes a list of functional requirements for
transport segment OAM in Segment Routing (SR) based networks.
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Copyright and License Notice
Copyright (c) 2016 IETF Trust and the persons identified as the
document authors. All rights reserved.
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Table of Contents
1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1 Terminology . . . . . . . . . . . . . . . . . . . . . . . . 4
2. Detailed Requirement List . . . . . . . . . . . . . . . . . . 4
3 Security Considerations . . . . . . . . . . . . . . . . . . . . 7
4 IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 7
5 References . . . . . . . . . . . . . . . . . . . . . . . . . . 7
5.1 Normative References . . . . . . . . . . . . . . . . . . . 7
5.2 Informative References . . . . . . . . . . . . . . . . . . 7
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 7
Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . . 8
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1 Introduction
[I-D.filsfils-rtgwg-segment-routing] introduces and explains Segment
Routing architecture that leverages source routing and tunneling
standards which can be applied directly to MPLS dataplane with no
changes on forwarding plane and on IPv6 dataplane with new Routing
Extension Header. In addition [I-D. draft-anand-spring-poi-sr]
introduces the concept of a Transport Segment at the edge of the
packet and optical network that represents the optical path taken for
a given flow.
P5
P1 _ .-'-._ ,'P4
`._ .-' `-. ,'
`. _.-' `-._ ,'
`-. .-' `-. ,'
P2`.-'--------------------------`-.- P3
|\ /|
| \ / | Packet
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
| \ / |
| \ / | Transport
| \ / |
| ................../ |
| ,'O2 O3`. |
| ,' `. |
|,' `. |
O1\ | O4
\ ,'
\ ,'
.......................-
O6 O5
Figure 1: Representation of a packet-optical path
In Figure 1 above, the nodes represent a packet optical network.
P1,...,P5 are packet devices. Nodes P2 and P3 are connected via optical
network comprising of nodes O1,...,O6. Nodes P2 and P3 are POGs that
communicate with other packet devices and also with the devices in the
optical transport domain.
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This document is a place holder to identify and list the OAM
requirements for Segment Routing based network which can further be
extended to produce OAM tools for path liveliness and service validation
across the optical domain using Transport Segments. In the above figure,
these requirements would pertain to nodes P2 and P3.
1.1 Terminology
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in RFC 2119 [RFC2119].
SR: Segment Routing
Initiator: Centralized OAM initiator
POG: Packet Optical Gateway that interworks between a packet and
optical network
2. Detailed Requirement List
This section list the OAM requirement for Transport Segments in a
Segment Routing based network. The below listed requirements MUST be
supported within an optical dataplane.
REQ#1: Transport Segment OAM SHOULD support Continuity Check
(liveliness of a path - BFD), Connectivity Verification (BFD, Ping),
Fault Verification - exercised on demand to validate the reported fault
(Ping).
REQ#2: Transport Segment OAM MUST support both On-demand and
Continuous OAM functionality.
REQ#3: Transport Segment OAM packet MUST follow exactly the same path
as the dataplane traffic.
REQ#4: The Transport Segment OAM packet MUST have the ability to
exercise any available paths as defined by the transport segment label.
REQ#5: Transport Segment OAM SHOULD have the ability to allow the
Initiator to add the Remote Transport Label and control the return path
from egress responder. draft-ietf-mpls-bfd-directed has provided the
semantics of a return path which would suit this need.
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REQ#6: Transport Segment OAM MUST have the ability to be initialized
from an ingress POG node to perform connectivity verification and
continuity check to any remote POG within the same optical domain ID
based on the declared Transport Segment Label.
REQ#7: In case of any failure with continuity check, Transport Segment
OAM Layer SHOULD support rapid Connectivity Fault notification to the
Packet Control plane of the POG to withdraw the Transport Segment Label
associated with the affected path and/or take a local protection action.
REQ#8: Transport Segment OAM SHOULD also have the ability to be
initialized from a centralized controller.
REQ#9: When Transport Segment OAM is initialized from centralized
controller, the node on receiving the alert MAY take a local protection
action and/or pop an informational message.
REQ#10: When Transport Segment OAM is initialized, it SHOULD support
node redundancy based on network configuration. If primary Initiator
fails, secondary one MUST take over the responsibility without having
any impact on customer traffic.
REQ#11: Transport Segment OAM MUST have the ability to measure
bidirectional packet loss, throughput measurement, delay variation, as
well as unidirectional and dyadic measurements.
REQ#12: When a new path is instantiated, Transport Segment OAM SHOULD
allow path verification without noticeable delay. It may be desired to
check for liveliness of the optical path using Transport Segment OAM
before announcing the Transport Segment.
REQ#13: The above listed requirements SHOULD be supported without any
scalability limitation imposed and SHOULD be extensible to accommodate
any new SR functionality.
REQ#14: Transport Segment OAM SHOULD maintain per Transport label state
entry at the originating POG.
REQ#15: When traffic engineering is initiated by centralized controller
device, and when Transport Segment OAM is performed by POGs, there MUST
be a mechanism to communicate the failure to a centralized controller
device.
REQ#16: When a local repair in the optical network takes place, the
characteristics of the path between the POGS may have changed. If there
is significant change in the path characteristics based on thresholds,
the ingress POG SHALL trigger a re-advertisement of the transport
segment label at the global level.
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REQ#17: The format of the Transport Segment OAM Ping packet SHALL follow
RFC 4379.
REQ#18: The format of the Transport Segment OAM BFD packet SHALL follow
RFC 5884.
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3 Security Considerations
This document does not introduce any new security considerations.
4 IANA Considerations
TBD.
5 References
5.1 Normative References
[I-D.ietf-spring-segment-routing] Filsfils, C.,
Previdi, S., Decraene, B., Litkowski, S., and r.
rjs@rob.sh, "Segment Routing Architecture", draft-
ietf-spring-segment-routing-04 (work in progress), July
2015.
[I-D.ietf-mpls-bfd-directed] Mirsky, G., Tantsura,
J., Varlashkin, I., and M. Chen, "Bidirectional
Forwarding Detection (BFD) Directed Return Path",
draft-ietf-mpls-bfd-directed-02 (work in progress),
March 2016.
[I-D.draft-anand-spring-poi-sr-01] Madhukar Anand,
Sanjoy Bardhan, Ramesh Subrahmaniam, Tantsura, J.
"Packet-Optical Integration in Segment Routing", draft-
anand-spring-poi-sr-01 (work in progress), July
2016.
5.2 Informative References
Authors' Addresses
Sanjoy Bardhan
Infinera Corporation
169 W Java Dr, Sunnyvale, CA 94089
Email: sbardhan@infinera.com
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Madhukar Anand
Infinera Corporation
169 W Java Dr, Sunnyvale, CA 94089
Email: manand@infinera.com
Ramesh Subrahmaniam
Infinera Corporation
169 W Java Dr, Sunnyvale, CA 94089
Email: RSubrahmaniam@infinera.com
Jeff Tantsura
Email: jefftant.ietf@gmail.com
Acknowledgments
The authors would like to thank Krish Verma for his comments and
review of this document.
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