Internet DRAFT - draft-bryskin-netconf-automation-framework
draft-bryskin-netconf-automation-framework
Network Working Group I. Bryskin
Internet-Draft Huawei Technologies
Intended status: Informational X. Liu
Expires: April 19, 2018 Jabil
A. Clemm
Huawei
H. Birkholz
Fraunhofer SIT
T. Zhou
Huawei
October 16, 2017
YANG PUSH Based Generalized Network Control Automation Problem Statement
draft-bryskin-netconf-automation-framework-00
Abstract
This document describes the objective of the YANG PUSH based
generalized network control automation framework.
Status of This Memo
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Objective . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 4
4. Security Considerations . . . . . . . . . . . . . . . . . . . 4
5. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 4
6. References . . . . . . . . . . . . . . . . . . . . . . . . . 4
6.1. Normative References . . . . . . . . . . . . . . . . . . 4
6.2. Informative References . . . . . . . . . . . . . . . . . 5
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 5
1. Introduction
YANG "Custom Subscription to Event Notifications" model
[I-D.ietf-netconf-subscribed-notifications] allows for a network
client automation of network remote monitoring. Specifically, using
this model, a network client can subscribe on and receive one or more
data streams, each associated with one or more events defined by YANG
model(s) governing the network's YANG data store(s). The client can
also tailor said streams to its needs by specifying filters on the
streams contents, but, otherwise, the client has no control on the
stream contents. For example, the client has no way of expanding a
stream to carry additional information that was not defined to be a
part of said stream.
YANG "Subscribing to YANG datastore push updates" model
[I-D.ietf-netconf-yang-push], which is an augmentation of the "Custom
Subscription to Event Notifications" model, defines a higher level of
network remote monitoring automation - it allows for the client
itself to define the origins, trigger/maintain conditions and
contents of data streams to be sent by the network to the client.
This capability is modeled via target-trigger-notify constructs,
which allow for the client to specify data store nodes of interest
and, possibly, sub-trees rooted by them (targets), conditions to
trigger and maintain associated with them streams (e.g. particular
change(s) in one or more of the nodes attributes), the contents of
the streams and filters to further fine-tune the streams according to
the client's needs.
It could be observed that the notify part of the target-trigger-
notify construct stands for "send me notification', which is one of,
generally speaking, many actions the client might want the network to
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perform, provided that the target-trigger condition holds. For
example, instead of sending a notification with some pre-denied
content, the client might want the network to perform:
a. immediate network re-configuration (e.g. modification of one or
more attributes of one or more CONFIG=TRUE data store nodes);
b. scheduling one time or periodic such reconfigurations in the
future;
c. calling an RPC defined by one of the YANG models supported by the
network ( e.g. calling network's path computer to evaluate
whether an alternative/more optimal path is available for a given
connection);
d. Dynamic linking/unlinking parent and child data stores supported
by the network;
e. etc.
It could also be observed that "periodic" and "on-change" are two of
the conditions that the client might want. The conditions can be
expanded to be a logical expression of other event states and some
operational data states of the network., as well, as outputs of RPCs.
2. Objective
The main objective of the YANG PUSH Based Generalized Network Control
Automation framework is to generalize the target-trigger-notify
construct into event-condition-action construct, where:
event
a particular change in the network state explicitly defined by one
of the YANG models supported by the network or implicitly defined
by the client, which is constantly monitored by the network;
condition
a logical expression that is evaluated only once after the
associated event is detected;
action
an operation (non-exhaustive list of which is described above) to
be carried out by the network when the associated event is
detected and the associated condition is met.
The client will be able to describe the desired network behavior by
configuring with the network event-condition-action triplets as rules
prior to any services provided by the network to the client. Such an
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approach will take the client out of the network control loop, thus,
changing the client's role from being network's "micro-manager" to
being network's "police officer", which interferes into network
operations only in exceptional/unpredicted situations.
There are numerous benefits to such paradigm, including:
o lower latency, faster responsiveness of the network to various
events/conditions;
o better scale (e.g. the client may control more networks because it
does not have to monitor/micro-manage any of them);
o CPU and bandwidth savings due to the reduced amount of
communication between the client and the network.
It is envisioned that the YANG PUSH Based Generalized Network Control
Automation framework will fit well within "SUPA Policy-based
Management Framework"
[I-D.ietf-supa-policy-based-management-framework], which will
inherently provide a higher level of automation, for example, by:
a. combining multiple micro-conditions into a single macro-condition
via a number of logical operations;
b. combining multiple micro-actions into a single transaction with a
possibility of specifying policies with respect to handling
errors/exceptions of each of the transaction components.
3. IANA Considerations
This document has no actions for IANA.
4. Security Considerations
This document does not define networking protocols and data, hence
are not directly responsible for security risks.
5. Acknowledgements
6. References
6.1. Normative References
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[I-D.ietf-netconf-subscribed-notifications]
Voit, E., Clemm, A., Prieto, A., Nilsen-Nygaard, E., and
A. Tripathy, "Custom Subscription to Event Notifications",
draft-ietf-netconf-subscribed-notifications-05 (work in
progress), October 2017.
[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-10 (work in progress), October 2017.
[I-D.ietf-supa-policy-based-management-framework]
LIU, W., Xie, C., Strassner, J., Karagiannis, G., Klyus,
M., and J. Bi, "SUPA Policy-based Management Framework",
draft-ietf-supa-policy-based-management-framework-03 (work
in progress), July 2017.
6.2. Informative References
[RFC7950] Bjorklund, M., Ed., "The YANG 1.1 Data Modeling Language",
RFC 7950, DOI 10.17487/RFC7950, August 2016,
<https://www.rfc-editor.org/info/rfc7950>.
[I-D.ietf-supa-generic-policy-data-model]
Halpern, J. and J. Strassner, "Generic Policy Data Model
for Simplified Use of Policy Abstractions (SUPA)", draft-
ietf-supa-generic-policy-data-model-04 (work in progress),
June 2017.
[I-D.ietf-supa-generic-policy-info-model]
Strassner, J., Halpern, J., and S. Meer, "Generic Policy
Information Model for Simplified Use of Policy
Abstractions (SUPA)", draft-ietf-supa-generic-policy-info-
model-03 (work in progress), May 2017.
Authors' Addresses
Igor Bryskin
Huawei Technologies
EMail: Igor.Bryskin@huawei.com
Xufeng Liu
Jabil
EMail: Xufeng_Liu@jabil.com
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Alexander Clemm
Huawei
EMail: ludwig@clemm.org
Henk Birkholz
Fraunhofer SIT
EMail: henk.birkholz@sit.fraunhofer.de
Tianran Zhou
Huawei
EMail: zhoutianran@huawei.com
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