Internet DRAFT - draft-hares-netconf-i2rs-restconf
draft-hares-netconf-i2rs-restconf
I2RS working group S. Hares
Internet-Draft Huawei
Intended status: Informational A. Dass
Expires: September 30, 2017 Ericsson
March 29, 2017
RESTCONF Changes to Support I2RS Protocol
draft-hares-netconf-i2rs-restconf-02.txt
Abstract
This document describes two RESTCONF optional capabilities (i2rs-
control plane capability, ephemeral state capabilities) that are
needed to support the I2RS protocol needs.
The purpose of this draft is to kick-start the discussions with I2RS
Working Group and NETCONF WG on these two capabilities.
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet-
Drafts is at http://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on September 30, 2017.
Copyright Notice
Copyright (c) 2017 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
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include Simplified BSD License text as described in Section 4.e of
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the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Background on I2RS . . . . . . . . . . . . . . . . . . . 3
1.2. Structure of draft . . . . . . . . . . . . . . . . . . . 3
2. Definitions and Background on I2RS . . . . . . . . . . . . . 3
2.1. IETF Requirements language . . . . . . . . . . . . . . . 3
2.2. I2RS Definitions . . . . . . . . . . . . . . . . . . . . 3
2.3. I2RS protocol requirements . . . . . . . . . . . . . . . 5
3. RESTCONF control plane datastore capability . . . . . . . . . 5
3.1. Overview . . . . . . . . . . . . . . . . . . . . . . . . 5
3.2. Dependencies . . . . . . . . . . . . . . . . . . . . . . 6
3.3. New Operations . . . . . . . . . . . . . . . . . . . . . 6
3.4. Modified Operations . . . . . . . . . . . . . . . . . . . 6
4. RESTCONF protocol extensions for the ephemeral datastore . . 6
4.1. Overview . . . . . . . . . . . . . . . . . . . . . . . . 6
4.2. Dependencies . . . . . . . . . . . . . . . . . . . . . . 7
4.3. Capability identifier . . . . . . . . . . . . . . . . . . 8
4.4. New Operations . . . . . . . . . . . . . . . . . . . . . 8
4.5. Modification to data resources . . . . . . . . . . . . . 8
4.6. Modification to existing operations . . . . . . . . . . . 8
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 9
6. Security Considerations . . . . . . . . . . . . . . . . . . . 9
7. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 9
8. References . . . . . . . . . . . . . . . . . . . . . . . . . 9
8.1. Normative References: . . . . . . . . . . . . . . . . . . 9
8.2. Informative References . . . . . . . . . . . . . . . . . 11
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 14
1. Introduction
This a proposal for the following two RESTCONF capabilities to
augment RESTCONF [RFC8040] to support the first version of the I2RS
protocol: Control plane datstore capability and ephemeral state
capability. The yang that supports this proposal is described in
[I-D.hares-netmod-i2rs-yang]. This work is based on the datastore
definitions in [I-D.ietf-netmod-revised-datastores].
This draft parallels a similar proposal for NETCONF [RFC6241] is
described in [I-D.hares-netconf-i2rs-protocol]. One difference
between the proposed capabilities for i2rs control-plane capability
additions to NETCONF and the proposed capabilities for i2rs control-
plane for RESTCONF is write-collection. RESTCONF has edit-collision
capability already which only needs a usage description.
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1.1. Background on I2RS
The I2RS architecture [RFC7921] defines the I2RS interface "a
programmatic interface for state transfer in and out of the Internet
routing system". The I2RS protocol is a protocol designed to a
higher level protocol comprised of a set of existing protocols which
have been extended to work together to support a new interface to the
routing system. The I2RS protocol is a "reuse" management protocol
which creates new management protocols by reusing existing protocols
and extending these protocols for new uses, and has been designed to
be implemented in phases [RFC7921].
1.2. Structure of draft
The structure of this document is:
Section 2 provides definitions and background on I2RS work. (If
you are familiar with the I2RS architecture and requirements, you
can skip this section.)
Section 3 describes the RESTCONF control plane datastore
capability.
Section 4 describes the RESTCONF ephemeral state capabiilty. .
2. Definitions and Background on I2RS
This section reviews definitions from I2RS architecture, and provides
background on I2RS work for the reader.
2.1. IETF Requirements language
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].
2.2. I2RS Definitions
The I2RS architecture [RFC7921] defines the following terms:
ephemeral data: is data which does not persist across a reboot
(software or hardware) or a power on/off condition. Ephemeral
data can be configured data or data recorded from operations of
the router. Ephemeral configuration data also has the property
that a system cannot roll back to a previous ephemeral
configuration state. (See [RFC7921] for an architectural
overview, [I-D.ietf-i2rs-ephemeral-state] for requirements, and
[I-D.ietf-netmod-revised-datastores] for discussion of how the
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ephemeral datastore as a control plane datastore interacts with
intended datstore and dynamic configuration protocols to form the
applied datastore".
local configuration: is the data on a routing system which does
persist across a reboot (software or hardware) and a power on/off
condition. Local configuration has the ability to roll back to a
pervious configuration state. Local configuration is defined as
the intended datastore [I-D.ietf-netmod-revised-datastores] which
is modified by dynamic configuration protocols (such as DHCP) and
the I2RS ephemeral data store
dynamic configuration protocols datastore are configuration
protocols such as DHCP that interact with the intended datastore
(which does persist across a reboot (software or hardware) power
on/off condition), and the I2RS ephemeral state control plane
datastore.
control plane protocols datastore is a datastore which is loaded by
control plane protocols (e.g. I2RS protocol) rather than system
configuration protocols. (see
[I-D.ietf-netmod-revised-datastores]).
operator-applied policy: is a policy that an operator sets that
determines how the ephemeral datastore as a control plane data
store interacts with applied datastore (as defined in
[I-D.ietf-netmod-revised-datastores]). This operator policy
consists of policy knobs that the operator sets to determine how
the I2RS agent control plane ephemeral state datastore will
interact with the intended configuration datastor and the dynamic
configuration protocol datastore. Three policy knobs could be
used to implement this policy:
* policy knob 1: I2RS Ephemeral control-plane datastore takes
takes precedence over the intended datastore in the routing
protocols.
* policy knob 2: Updated intended configuration datastore takes
precedence over the I2RS ephemeral control-plane data store in
the routing protocols
* policy knob 3: Ephemeral control plane datastore takes
precedence over any other dynamic configuration protocols
datastore.
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2.3. I2RS protocol requirements
The requirements for the I2RS protocol are defined in the following
documents:
o I2RS Problem Statement [RFC7920],
o I2RS Architecture [RFC7921],
o I2RS Traceability [RFC7922],
o Publication and Subscription [RFC7923],
o I2RS Ephemeral State Requrements, ,
[I-D.ietf-i2rs-ephemeral-state]
o I2RS Protocol Security Requirements,
[I-D.ietf-i2rs-protocol-security-requirements]
The Interface to the routing System (I2RS) creates a new capability
for the routing systems, and with greater capaiblities come a greater
need for security. The requirements for a secure environment for
I2RS is described in [I-D.ietf-i2rs-security-environment-reqs].
3. RESTCONF control plane datastore capability
capability-name: i2rs-control-plane
3.1. Overview
The i2rs-control-plane datastore capability enables the RESTCONF to
support the following dynamic control plane datastore.
o API resource that is {+restconf}/datastore/<datastore-name>/data/
and operational state specific to the control plane datastore
({+restconf/cp-data/opstate}).
o It also includes the ability to have the applied datastore and the
opstate datatstore (per [I-D.ietf-netmod-revised-datastores]) with
the ability to return meta-data with the following information:
* Entity-Tag encoding of <client-id><priority> or any portion of
the filter.
* "with defaults"
* "with validation" - Yang specified validation (Unclear if this
is the best way for validation.)
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Ability to provide read access for the configuration datstore
Ability to provide read access for other dynamic datastores
3.2. Dependencies
This protocol strawman utilizes the following existing proposed
features for NETCONF and RESTCONF
o RESTCONF [RFC8040].
o Module library [RFC7895],
o RESTCONF Patch Media Type [RFC8072],
o NETCONF Support for event notifications
[I-D.ietf-netconf-netconf-event-notifications],
o Publication/Subscription via Push [I-D.ietf-netconf-yang-push],
o NETCONF and HTTP Transport for Event Notivications
[I-D.ietf-netconf-restconf-notif],
o Publication/Subscription via Push [I-D.ietf-netconf-yang-push],
o syslog yang module (both [RFC5424] and
[I-D.ietf-netmod-syslog-model]
3.3. New Operations
none
3.4. Modified Operations
All RESTCONF methods (OPTIONS, HEAD, GET, POST, PT, PATCH, DELETE)
need to work in the control plane datastores. config=TRUE data, and
where appropriate config=FALSE data.
4. RESTCONF protocol extensions for the ephemeral datastore
capability-name: ephemeral-state
4.1. Overview
This capability defines the RESTCONF protocol extensions for control
plane protocols that support control plane data stores with ephemeral
data.
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Ephemeral state is not unique to I2RS work.
The ephemeral capability is the ability to support a dynamic
datastores which are entirely ephemeral or have ephemeral state
modules, or ephemeral statements within objects in a modules. These
objects can be configuration state (config=TRUE) or operational state
(config=FALSE).
Ephemeral state in datastores, ephemeral modules or ephemeral objects
within a module have one key characteristics: the data does not
persist across reboots. The ephemeral configuration state must be
restored by a client, and the operational state will need to be
regenerated.
The entire requirements for ephemeral state for the I2RS control
plane protocol are listed in [I-D.ietf-i2rs-ephemeral-state].
Compared to RESTCONF functionality there are 4 groups of additional
changes:
Constraints The ability to enforce the constraints for get (aka
read) references (to/from) the {+restconf/data} datastore, and
{+restconf/cp-data} control plane datastore. ((see Ephemeral-REQ-
02, Ephemeral-REQ-03, and Ephemeral-REQ-04 in
[I-D.ietf-i2rs-ephemeral-state]). The "validation" yang statement
in [I-D.hares-netmod-i2rs-yang] could encode specific validation
for the ephemeral case per datatstore or per object. [Editor's
note: Aid is needed to determine how validation occurs.]
Ephemeral in Data Modules Yang modules must identify Yang objects
(modules, submodules or objects within yang modules which are
ephemeral and augment other nodes) and allow an "ephemeral=TRUE"
feature.
Roll-back an ephemeral node cannot roll-back to its previous value,
4.2. Dependencies
The ephemeral capabilities have the following dependencies:
o Yang modules must support the following:
* identifying datastores, modules, and objects as ephemeral.
(ephemeral=True)
* Ability to have control plane datastores which are ephemeral.
o The following features must be supported by RESTCONF
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* Module library [RFC7895],
* RESTCONF Protocol [RFC8040],
* RESTCONF Patch Media Type [RFC8072],
* NETCONF Support for event notifications
[I-D.ietf-netconf-netconf-event-notifications],
* Publication/Subscription via Push [I-D.ietf-netconf-yang-push],
* NETCONF and HTTP Transport for Event Notivications
[I-D.ietf-netconf-restconf-notif],
* Subsribing to Yang datastore push updates
[I-D.ietf-netconf-yang-push],
4.3. Capability identifier
The ephemeral-datastore capability is identified by the following
capability string: ephemeral (TBD URI)
4.4. New Operations
none
4.5. Modification to data resources
RESTCONF must be able to support the ephemeral data in an an control-
plane dynamic datastore. This is any API resource that is
{+restconf}/datastore/<datastore-name>/data/ and operational state
specific to the control plane datastore ({+restconf/cp-data/
opstate}).
RESTCONF library functions must be able to store an indication that a
data module has ephemeral state as meta-data.
4.6. Modification to existing operations
RESTCONF operations of GET, POST, PUT, PATCH, and DELETE must be able
to filter on meta-data with "ephemeral" flag. (Should this be only
read).
The operations must support the following things about ephemeral.
1. The ephemeral does not persist over a reboot,
2. an ephemeral node cannot roll-back to its previous value,
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5. IANA Considerations
TBD -
6. Security Considerations
The security requirements for the I2RS protocol are covered in
[I-D.ietf-i2rs-protocol-security-requirements]. The security
environment the I2RS protocol is covered in
[I-D.ietf-i2rs-security-environment-reqs]. Any person implementing
or deploying the I2RS protocol should consider both security
requirements.
7. Acknowledgements
TBD
8. References
8.1. Normative References:
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119,
DOI 10.17487/RFC2119, March 1997,
<http://www.rfc-editor.org/info/rfc2119>.
[RFC4107] Bellovin, S. and R. Housley, "Guidelines for Cryptographic
Key Management", BCP 107, RFC 4107, DOI 10.17487/RFC4107,
June 2005, <http://www.rfc-editor.org/info/rfc4107>.
[RFC4960] Stewart, R., Ed., "Stream Control Transmission Protocol",
RFC 4960, DOI 10.17487/RFC4960, September 2007,
<http://www.rfc-editor.org/info/rfc4960>.
[RFC5339] Le Roux, JL., Ed. and D. Papadimitriou, Ed., "Evaluation
of Existing GMPLS Protocols against Multi-Layer and Multi-
Region Networks (MLN/MRN)", RFC 5339,
DOI 10.17487/RFC5339, September 2008,
<http://www.rfc-editor.org/info/rfc5339>.
[RFC5424] Gerhards, R., "The Syslog Protocol", RFC 5424,
DOI 10.17487/RFC5424, March 2009,
<http://www.rfc-editor.org/info/rfc5424>.
[RFC6020] Bjorklund, M., Ed., "YANG - A Data Modeling Language for
the Network Configuration Protocol (NETCONF)", RFC 6020,
DOI 10.17487/RFC6020, October 2010,
<http://www.rfc-editor.org/info/rfc6020>.
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[RFC6241] Enns, R., Ed., Bjorklund, M., Ed., Schoenwaelder, J., Ed.,
and A. Bierman, Ed., "Network Configuration Protocol
(NETCONF)", RFC 6241, DOI 10.17487/RFC6241, June 2011,
<http://www.rfc-editor.org/info/rfc6241>.
[RFC6242] Wasserman, M., "Using the NETCONF Protocol over Secure
Shell (SSH)", RFC 6242, DOI 10.17487/RFC6242, June 2011,
<http://www.rfc-editor.org/info/rfc6242>.
[RFC6244] Shafer, P., "An Architecture for Network Management Using
NETCONF and YANG", RFC 6244, DOI 10.17487/RFC6244, June
2011, <http://www.rfc-editor.org/info/rfc6244>.
[RFC6536] Bierman, A. and M. Bjorklund, "Network Configuration
Protocol (NETCONF) Access Control Model", RFC 6536,
DOI 10.17487/RFC6536, March 2012,
<http://www.rfc-editor.org/info/rfc6536>.
[RFC7158] Bray, T., Ed., "The JavaScript Object Notation (JSON) Data
Interchange Format", RFC 7158, DOI 10.17487/RFC7158, March
2014, <http://www.rfc-editor.org/info/rfc7158>.
[RFC7589] Badra, M., Luchuk, A., and J. Schoenwaelder, "Using the
NETCONF Protocol over Transport Layer Security (TLS) with
Mutual X.509 Authentication", RFC 7589,
DOI 10.17487/RFC7589, June 2015,
<http://www.rfc-editor.org/info/rfc7589>.
[RFC7803] Leiba, B., "Changing the Registration Policy for the
NETCONF Capability URNs Registry", BCP 203, RFC 7803,
DOI 10.17487/RFC7803, February 2016,
<http://www.rfc-editor.org/info/rfc7803>.
[RFC7895] Bierman, A., Bjorklund, M., and K. Watsen, "YANG Module
Library", RFC 7895, DOI 10.17487/RFC7895, June 2016,
<http://www.rfc-editor.org/info/rfc7895>.
[RFC7920] Atlas, A., Ed., Nadeau, T., Ed., and D. Ward, "Problem
Statement for the Interface to the Routing System",
RFC 7920, DOI 10.17487/RFC7920, June 2016,
<http://www.rfc-editor.org/info/rfc7920>.
[RFC7921] Atlas, A., Halpern, J., Hares, S., Ward, D., and T.
Nadeau, "An Architecture for the Interface to the Routing
System", RFC 7921, DOI 10.17487/RFC7921, June 2016,
<http://www.rfc-editor.org/info/rfc7921>.
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[RFC7922] Clarke, J., Salgueiro, G., and C. Pignataro, "Interface to
the Routing System (I2RS) Traceability: Framework and
Information Model", RFC 7922, DOI 10.17487/RFC7922, June
2016, <http://www.rfc-editor.org/info/rfc7922>.
[RFC7923] Voit, E., Clemm, A., and A. Gonzalez Prieto, "Requirements
for Subscription to YANG Datastores", RFC 7923,
DOI 10.17487/RFC7923, June 2016,
<http://www.rfc-editor.org/info/rfc7923>.
[RFC7950] Bjorklund, M., Ed., "The YANG 1.1 Data Modeling Language",
RFC 7950, DOI 10.17487/RFC7950, August 2016,
<http://www.rfc-editor.org/info/rfc7950>.
[RFC7952] Lhotka, L., "Defining and Using Metadata with YANG",
RFC 7952, DOI 10.17487/RFC7952, August 2016,
<http://www.rfc-editor.org/info/rfc7952>.
[RFC7958] Abley, J., Schlyter, J., Bailey, G., and P. Hoffman,
"DNSSEC Trust Anchor Publication for the Root Zone",
RFC 7958, DOI 10.17487/RFC7958, August 2016,
<http://www.rfc-editor.org/info/rfc7958>.
[RFC8040] Bierman, A., Bjorklund, M., and K. Watsen, "RESTCONF
Protocol", RFC 8040, DOI 10.17487/RFC8040, January 2017,
<http://www.rfc-editor.org/info/rfc8040>.
[RFC8072] Bierman, A., Bjorklund, M., and K. Watsen, "YANG Patch
Media Type", RFC 8072, DOI 10.17487/RFC8072, February
2017, <http://www.rfc-editor.org/info/rfc8072>.
8.2. Informative References
[I-D.hares-netconf-i2rs-protocol]
Hares, S. and a. amit.dass@ericsson.com, "NETCONF Changes
to Support I2RS Protocol", draft-hares-netconf-i2rs-
protocol-00 (work in progress), November 2016.
[I-D.hares-netmod-i2rs-yang]
Hares, S. and a. amit.dass@ericsson.com, "Yang for I2RS
Protocol", draft-hares-netmod-i2rs-yang-04 (work in
progress), March 2017.
[I-D.ietf-i2rs-ephemeral-state]
Haas, J. and S. Hares, "I2RS Ephemeral State
Requirements", draft-ietf-i2rs-ephemeral-state-23 (work in
progress), November 2016.
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[I-D.ietf-i2rs-protocol-security-requirements]
Hares, S., Migault, D., and J. Halpern, "I2RS Security
Related Requirements", draft-ietf-i2rs-protocol-security-
requirements-17 (work in progress), September 2016.
[I-D.ietf-i2rs-rib-data-model]
Wang, L., Ananthakrishnan, H., Chen, M.,
amit.dass@ericsson.com, a., Kini, S., and N. Bahadur, "A
YANG Data Model for Routing Information Base (RIB)",
draft-ietf-i2rs-rib-data-model-07 (work in progress),
January 2017.
[I-D.ietf-i2rs-rib-info-model]
Bahadur, N., Kini, S., and J. Medved, "Routing Information
Base Info Model", draft-ietf-i2rs-rib-info-model-10 (work
in progress), December 2016.
[I-D.ietf-i2rs-security-environment-reqs]
Migault, D., Halpern, J., and S. Hares, "I2RS Environment
Security Requirements", draft-ietf-i2rs-security-
environment-reqs-05 (work in progress), March 2017.
[I-D.ietf-i2rs-yang-l3-topology]
Clemm, A., Medved, J., Varga, R., Liu, X.,
Ananthakrishnan, H., and N. Bahadur, "A YANG Data Model
for Layer 3 Topologies", draft-ietf-i2rs-yang-
l3-topology-08 (work in progress), January 2017.
[I-D.ietf-netconf-call-home]
Watsen, K., "NETCONF Call Home and RESTCONF Call Home",
draft-ietf-netconf-call-home-17 (work in progress),
December 2015.
[I-D.ietf-netconf-keystore]
Watsen, K., "Keystore Model", draft-ietf-netconf-
keystore-01 (work in progress), March 2017.
[I-D.ietf-netconf-netconf-event-notifications]
Prieto, A., Clemm, A., Voit, E., Nilsen-Nygaard, E.,
Tripathy, A., Chisholm, S., and H. Trevino, "NETCONF
Support for Event Notifications", draft-ietf-netconf-
netconf-event-notifications-01 (work in progress), October
2016.
[I-D.ietf-netconf-restconf]
Bierman, A., Bjorklund, M., and K. Watsen, "RESTCONF
Protocol", draft-ietf-netconf-restconf-18 (work in
progress), October 2016.
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[I-D.ietf-netconf-restconf-notif]
Voit, E., Prieto, A., Tripathy, A., Nilsen-Nygaard, E.,
Clemm, A., and A. Bierman, "Restconf and HTTP Transport
for Event Notifications", draft-ietf-netconf-restconf-
notif-02 (work in progress), March 2017.
[I-D.ietf-netconf-rfc5277bis]
Clemm, A., Prieto, A., Voit, E., Nilsen-Nygaard, E.,
Tripathy, A., Chisholm, S., and H. Trevino, "Subscribing
to Event Notifications", draft-ietf-netconf-rfc5277bis-01
(work in progress), October 2016.
[I-D.ietf-netconf-tls-client-server]
Watsen, K. and G. Wu, "TLS Client and Server Models",
draft-ietf-netconf-tls-client-server-02 (work in
progress), March 2017.
[I-D.ietf-netconf-yang-patch]
Bierman, A., Bjorklund, M., and K. Watsen, "YANG Patch
Media Type", draft-ietf-netconf-yang-patch-14 (work in
progress), November 2016.
[I-D.ietf-netconf-yang-push]
Clemm, A., Voit, E., Prieto, A., Tripathy, A., Nilsen-
Nygaard, E., Bierman, A., and B. Lengyel, "Subscribing to
YANG datastore push updates", draft-ietf-netconf-yang-
push-05 (work in progress), March 2017.
[I-D.ietf-netconf-zerotouch]
Watsen, K. and M. Abrahamsson, "Zero Touch Provisioning
for NETCONF or RESTCONF based Management", draft-ietf-
netconf-zerotouch-13 (work in progress), March 2017.
[I-D.ietf-netmod-revised-datastores]
Bjorklund, M., Schoenwaelder, J., Shafer, P., Watsen, K.,
and R. Wilton, "Network Management Datastore
Architecture", draft-ietf-netmod-revised-datastores-01
(work in progress), March 2017.
[I-D.ietf-netmod-schema-mount]
Bjorklund, M. and L. Lhotka, "YANG Schema Mount", draft-
ietf-netmod-schema-mount-04 (work in progress), March
2017.
[I-D.ietf-netmod-syslog-model]
Wildes, C. and K. Koushik, "A YANG Data Model for Syslog
Configuration", draft-ietf-netmod-syslog-model-14 (work in
progress), March 2017.
Hares & Dass Expires September 30, 2017 [Page 13]
Internet-Draft I2RS Protocol Yang March 2017
Authors' Addresses
Susan Hares
Huawei
Saline
US
Email: shares@ndzh.com
Amit Daas
Ericsson
Email: amit.dass@ericsson.com
Hares & Dass Expires September 30, 2017 [Page 14]
