Internet DRAFT - draft-wdbsp-teas-nrp-yang
draft-wdbsp-teas-nrp-yang
Network Working Group B. Wu
Internet-Draft D. Dhody
Intended status: Standards Track Huawei Technologies
Expires: 9 October 2023 V.P. Beeram
Juniper Networks
T. Saad
Cisco Systems
S. Peng
ZTE Corporation
7 April 2023
A YANG Data Model for Network Resource Partitions (NRPs)
draft-wdbsp-teas-nrp-yang-00
Abstract
This document defines a YANG data model for Network Resource
Partitions (NRPs). The model can be used, in particular, for the
realization of the IETF Network Slice Services.
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 https://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 9 October 2023.
Copyright Notice
Copyright (c) 2023 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
Provisions Relating to IETF Documents (https://trustee.ietf.org/
license-info) in effect on the date of publication of this document.
Please review these documents carefully, as they describe your rights
and restrictions with respect to this document. Code Components
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extracted from this document must include Revised BSD License text as
described in Section 4.e of the Trust Legal Provisions and are
provided without warranty as described in the Revised BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. NRP Data Model . . . . . . . . . . . . . . . . . . . . . . . 3
3.1. NRP Instantiation . . . . . . . . . . . . . . . . . . . . 4
3.1.1. Resource Reservation . . . . . . . . . . . . . . . . 5
3.1.2. NRP Selector . . . . . . . . . . . . . . . . . . . . 6
3.1.3. NRP Topology . . . . . . . . . . . . . . . . . . . . 6
3.2. NRP monitoring . . . . . . . . . . . . . . . . . . . . . 7
3.3. NRP Device Model Description . . . . . . . . . . . . . . 8
4. NRP Yang Module . . . . . . . . . . . . . . . . . . . . . . . 8
5. Security Considerations . . . . . . . . . . . . . . . . . . . 24
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 25
7. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 25
8. Contributor . . . . . . . . . . . . . . . . . . . . . . . . . 25
9. References . . . . . . . . . . . . . . . . . . . . . . . . . 26
9.1. Normative References . . . . . . . . . . . . . . . . . . 26
9.2. Informative References . . . . . . . . . . . . . . . . . 27
Appendix A. An Example . . . . . . . . . . . . . . . . . . . . . 29
Appendix B. NRP YANG Module Tree . . . . . . . . . . . . . . . . 32
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 35
1. Introduction
[I-D.ietf-teas-ietf-network-slices] defines a framework for IETF
Network Slice Services, which provide connectivity coupled with
network resources commitment between a number of Service Demarcation
Points (SDPs) over a shared network infrastructure. The IETF Network
Slice service is expressed in terms of one or more connectivity
constructs, which can be of a connection type (point-to-point (P2P),
point-to-multipoint (P2MP), or any-to-any (A2A)) and any combination
of these types.
This draft defines a YANG module of NRPs for mapping one or more
connection constructs of one or more IETF network slices, for
ensuring SLO and SLE and network scalability. An IETF Network Slice
Controller (NSC) can use it to manage NRP instances in order to
implement Network Slice Services.
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An NRP Policy [I-D.ietf-teas-ns-ip-mpls] is a policy construct that
enables instantiation of mechanisms in support of service specific
control and data plane behaviors on select topological elements
associated with the NRP.Section 3.1 describes the detailed definition
of NRP policy in NRP instantiation.
According to the YANG model classification of [RFC8309], the NRP
model is a network configuration model.
2. Terminology
The following terms are defined in [RFC6241] and are used in this
specification:
* configuration data
* state data
The following terms are defined in [RFC7950] and are used in this
specification:
* augment
* data model
* data node
The terminology for describing YANG data models is found in
[RFC7950].
The tree diagram used in this document follows the notation defined
in [RFC8340].
3. NRP Data Model
There are multiple modes of NRP operations to be supported as
follows:
* NRP instantiation: Depending on the slice service types and also
network status, there can be two types of approaches. One method
is to create an NRP instance before the network controller
processes the IETF Network Slice service request. Another one is
that the network controller may start creating an NRP instance
while configuring the IETF Network Slice service request.
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* NRP modification: When the capacity of an existing NPR link is
close to capacity, the bandwidth of the link could be increased.
And when the NRP link or node resources are insufficient, new NRP
links and nodes could be added.
* NRP Deletion: If the NSC determines that no slice service is using
an NRP, the NSC can delete the NRP instance.
* NRP Monitoring: The NSC can use the NRP model to track and monitor
NRP resource status and usage.
3.1. NRP Instantiation
An NRP policy specifies the rules for determining the topology
associated with the NRP and dictates how an NRP can be realized in
IP/MPLS networks using one of three partition modes. The NRP policy
dictates if the partitioning of the shared network resources can be
achieved in (a) just the data plane or in (b) just the control plane
or in (c) both the control and data planes.
The NRP policy modes (a) and (c) require the forwarding engine on
each NRP capable node to identify the traffic belonging to a specific
NRP and to apply the corresponding Per-Hop Behavior (PHB) or
forwarding mechanism that determines the forwarding treatment of the
packets belonging to the NRP. When catering to IETF Network Slices,
this NRP identification is referred to as the NRP selector and may
comprises of traffic streams from one or more connectivity constructs
(belonging to one or more IETF network slices) mapped to a specific
NRP. The NRP policy modes (b) and (c) require the distributed/
centralized resource reservation management.
'nrp-policy' is defined to enable NRP Stateful Traffic Engineering
(NRP-TE) [I-D.ietf-teas-ns-ip-mpls] and/or NRP IGP forwarding in IP/
MPLS networks.
The tree diagram used in this document follows the notation defined
in [RFC8340].
The high-level model structure defined by this document is as shown
below:
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module: ietf-nrp
augment /nw:networks:
+--rw nrp-policies
+--rw nrp-policy* [name]
+--rw name string
+--rw nrp-id? uint32
+--rw mode? identityref
+--rw resource-reservation
| ...
+--rw selector
| ...
+--rw phb-profile? string
+--rw topology
...
The 'networks' container from the 'ietf-network' module [RFC8345]
provides a placeholder for an inventory of nodes in the network.
This container is augmented to carry a set of NRP policies.
The 'nrp-policies' container carries a list of NRP policies. Each
'nrp-policy' entry is identified by a name and holds the set of
attributes needed to instantiate the NRP. Each entry also carries an
'nrp-id' leaf which uniquely identifies the NRP created by the
enforcement of this policy. The
The description of the 'nrp-policies' data nodes are as follows, and
the other key elements of each nrp-policy entry are discussed in the
following sub-sections.
* 'nrp-id': Is an identifier that is used to uniquely identify an
NRP instance within the NSC network scope.
* 'mode': Refers to control plane resource partition, data plane
resource partition, or a combination of both types.
3.1.1. Resource Reservation
The 'resource-reservation' container specifies the bandwidth resource
allocated to an NRP instance, or can be overridden by the
configuration of the link specific 'resource-reservation' nodes of
'nrp-topology'.
+--rw resource-reservation
+--rw (max-bw-type)?
+--:(bw-value)
| +--rw maximum-bandwidth? uint64
+--:(bw-percentage)
+--rw maximum-bandwidth-percent? rt-types:percentage
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3.1.2. NRP Selector
NRP selector defines the data plane encapsulation types and values
that are used to identify NRP-specific network resources. The data
plane mechanism could be based on IP, MPLS, or SRv6 forwarding.
+--rw selector
+--rw ipv4
| +--rw destination-prefix* inet:ipv4-prefix
+--rw ipv6
| +--rw (selector-type)?
| +--:(dedicated)
| | +--rw ipv6-hbh-eh? uint32
| +--:(srv6-sid-derived)
| | +--rw srv6-sid* inet:ipv6-prefix
| +--:(ipv6-destination-derived)
| +--rw destination-prefix* inet:ipv6-prefix
+--rw mpls
| +--rw (selector-type)?
| +--:(dedicated)
| | +--rw label? rt-types:mpls-label
| | +--rw label-position? identityref
| | +--rw label-position-offset? uint8
| +--:(derived)
| +--rw forwarding-label? empty
+--rw acl-ref* nrp-acl-ref
3.1.3. NRP Topology
'nrp-topology' defines a dedicated NRP topology.
When an NRP support IGP forwarding, the topology of NRP must be
congruent with an IGP instance.The topology used for IGP route
computation and forwarding can be derived using Multi-Topology
Routing (MTR) or Flex-algo. Multi-Topology Routing (MTR) is defined
in [RFC4915], [RFC5120], and [I-D.ietf-lsr-isis-sr-vtn-mt] or Flex-
algo is defined in [I-D.ietf-lsr-flex-algo].
The 'selection' container consists of a list of select subset of
links of an underlay topology or a pre-built topology.
The 'filter' container consists of a list of filters where each entry
references a topology filter [I-D.bestbar-teas-yang-topology-filter].
The topological elements that satisfy the membership criteria can
optionally override the default resource-reservation and nrp-selector
specific leafs.
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+--rw topology
+--rw igp-congruent!
| +--rw multi-topology-id? uint32
| +--rw algo-id? uint32
| +--rw sharing? boolean
+--rw (topology-type)?
+--:(selection)
| +--rw select
| +--rw topology-group* [group-id]
| +--rw group-id string
| +--rw base-topology-ref
| | ...
| +--rw links* [link-ref]
| | ...
| +--rw resource-reservation
| | ...
| +--rw link-partition-type?
| | identityref
| +--rw phb-profile? string
+--:(filter)
+--rw filters
+--rw filter* [filter-ref]
+--rw filter-ref
| nrp-topo-filter-ref
+--rw resource-reservation
| ...
+--rw selector
| ...
+--rw phb-profile? string
3.2. NRP monitoring
The NRP model can be used to track and monitor NRP operational status
and resource usage.
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augment /nw:networks/nw:network/nw:network-types:
+--rw nrp!
augment /nw:networks/nw:network/nw:node:
+--ro nrp
+--ro nrp-aware-dp-id
...
augment /nw:networks/nw:network/nt:link:
+--ro nrp
+--ro link-partition-type? identityref
+--ro bandwidth-value? uint64
+--ro nrp-aware-dp-id
| ...
+--ro statistics
...
augment /nw:networks/nw:network/nw:node:
+--ro nrps* [nrp-id]
+--ro nrp-id uint32
+--ro nrp
...
augment /nw:networks/nw:network/nt:link:
+--ro nrps* [nrp-id]
+--ro nrp-id uint32
+--ro link-partition-type? identityref
+--ro bandwidth-value? uint64
+--ro nrp-aware-dp-id
...
3.3. NRP Device Model Description
This provides a placeholder for future definition of the NRP device
model.
4. NRP Yang Module
The 'ietf-nrp' module uses types defined in [RFC8345].
<CODE BEGINS> file "ietf-nrp@2023-04-07.yang"
module ietf-nrp {
yang-version 1.1;
namespace "urn:ietf:params:xml:ns:yang:ietf-nrp";
prefix nrp;
import ietf-network {
prefix nw;
reference
"RFC 8345: A YANG Data Model for Network Topologies";
}
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import ietf-network-topology {
prefix nt;
reference
"RFC 8345: A YANG Data Model for Network Topologies";
}
import ietf-routing-types {
prefix rt-types;
reference
"RFC 8294: Common YANG Data Types for the Routing Area";
}
import ietf-te-types {
prefix te-types;
reference
"RFC 8776: Traffic Engineering Common YANG Types";
}
import ietf-te-packet-types {
prefix te-packet-types;
reference
"RFC 8776: Traffic Engineering Common YANG Types";
}
import ietf-srv6-types {
prefix srv6-types;
}
import ietf-inet-types {
prefix inet;
reference
"RFC 6991: Common YANG Data Types";
}
import ietf-access-control-list {
prefix acl;
reference
"RFC 8519: YANG Data Model for Network Access Control Lists
(ACLs)";
}
import ietf-topology-filter {
prefix topo-filt;
reference
"draft-bestbar-teas-yang-topology-filter: YANG Data Model
for Topology Filter";
}
organization
"IETF TEAS Working Group";
contact
"
WG Web: <http://tools.ietf.org/wg/teas/>
WG List:<mailto:teas@ietf.org>
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Editor: Bo Wu
<mailto:lana.wubo@huawei.com>
Editor: Dhruv Dhody
<mailto:dhruv.ietf@gmail.com>
Editor: Vishnu Pavan Beeram
<mailto:vbeeram@juniper.net>
Editor: Tarek Saad
<mailto:tsaad.net@gmail.com>
Editor: Shaofu Peng
<mailto:peng.shaofu@zte.com.cn>";
description
"This YANG module defines a network data module for
NRP(Network Resource Partition).
Copyright (c) 2023 IETF Trust and the persons identified as
authors of the code. All rights reserved.
Redistribution and use in source and binary forms, with or
without modification, is permitted pursuant to, and subject
to the license terms contained in, the Revised BSD License
set forth in Section 4.c of the IETF Trust's Legal Provisions
Relating to IETF Documents
(https://trustee.ietf.org/license-info).
This version of this YANG module is part of RFC XXXX
(https://www.rfc-editor.org/info/rfcXXXX); see the RFC itself
for full legal notices.";
revision 2023-04-07 {
description
"This is the initial version of NRP YANG model.";
reference
"RFC XXX: A YANG Data Model for Network Resource Partition";
}
/*
* I D E N T I T I E S
*/
identity nrp-partition-mode {
description
"Base identity for nrp partition type.";
}
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identity nrp-control-plane-partition {
base nrp-partition-mode;
description
"Identity for control plane partition.";
}
identity nrp-data-plane-partition {
base nrp-partition-mode;
description
"Identity for data plane partition.";
}
identity nrp-hybrid-plane-partition {
base nrp-partition-mode;
description
"Identity for both planes partition.";
}
identity nrp-link-partition-type {
description
"Base identity for interface partition type.";
}
identity virtual-sub-interface-partition {
base nrp-link-partition-type;
description
"Identity for virtual interface or sub-interface, e.g. FlexE.";
}
identity queue-partition {
base nrp-link-partition-type;
description
"Identity for queue partition type.";
}
/*
* Identity:
* MPLS Selector Label Position.
*/
identity selector-mpls-label-position {
description
"Base identity for the position of the MPLS selector label.";
}
identity selector-mpls-label-position-top {
base selector-mpls-label-position;
description
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"MPLS selector label is at the top of the label stack.";
}
identity selector-mpls-label-position-bottom {
base selector-mpls-label-position;
description
"MPLS selector label is either at the bottom or at a specific
offset from the bottom of the label stack.";
}
identity selector-mpls-label-position-indicator {
base selector-mpls-label-position;
description
"MPLS selector is preceded by a special purpose
indicator label in the label stack.";
}
/*
* T Y P E D E F S
*/
typedef nrp-acl-ref {
type leafref {
path "/acl:acls/acl:acl/acl:name";
}
description
"This type is used to reference an ACL.";
}
typedef nrp-topo-filter-ref {
type leafref {
path "/nw:networks/topo-filt:topology-filters/"
+ "topo-filt:topology-filter/topo-filt:name";
}
description
"This type is used to reference a Topology Filter.";
}
/*
* Grouping - NRP Resource Reservation
*/
grouping nrp-resource-reservation {
description
"Grouping for NRP resource reservation.";
container resource-reservation {
description
"Container for NRP resource reservation.";
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choice max-bw-type {
description
"Choice of maximum bandwidth specification.";
case bw-value {
leaf maximum-bandwidth {
type uint64;
description
"The maximum bandwidth allocated to an NRP
- specified as absolute value.";
}
}
case bw-percentage {
leaf maximum-bandwidth-percent {
type rt-types:percentage;
description
"The maximum bandwidth allocated to an NRP
- specified as percentage of link
capacity.";
}
}
}
}
}
/*
* G R O U P I N G S
*/
/*
* Grouping - MPLS selector label location specific fields
*/
grouping nrp-selector-mpls-label-location {
description
"Grouping for MPLS FAS label location specific fields.";
leaf label-position {
type identityref {
base selector-mpls-label-position;
}
description
"MPLS selector label position.";
}
leaf label-position-offset {
when "derived-from-or-self(../label-position,"
+ "'nrp:selector-mpls-label-position-bottom')" {
description
"MPLS label position offset is relevant only when the
label-position is set to 'bottom'.";
}
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type uint8;
description
"MPLS label position offset.";
}
}
/*
* Grouping - NRP Selector Configuration
*/
grouping nrp-selector-config {
description
"Grouping for NRP selector configuration.";
container selector {
description
"Container for NRP selector.";
container ipv4 {
description
"Container for IPv4 NRP selector.";
leaf-list destination-prefix {
type inet:ipv4-prefix;
description
"Any prefix from the specified set of IPv4
destination prefixes can be the selector.";
}
}
container ipv6 {
description
"Container for IPv6 NRP selector.";
choice selector-type {
description
"Choices for IPv6 selector type.";
case dedicated {
leaf ipv6-hbh-eh {
type uint32;
description
"The selector value carried in Hop-by-Hop
Option of IPv6 extension header.";
}
}
case srv6-sid-derived {
leaf-list srv6-sid {
type inet:ipv6-prefix;
description
"Any SID from the specified set of SRv6
SID can be the selector.";
}
}
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case ipv6-destination-derived {
leaf-list destination-prefix {
type inet:ipv6-prefix;
description
"Any prefix from the specified set of IPv6
destination prefixes can be the selector.";
}
}
}
}
container mpls {
description
"Container for MPLS NRP selector.";
choice selector-type {
description
"Choices for MPLS label specification.";
case dedicated {
leaf label {
type rt-types:mpls-label;
description
"MPLS selector Label is explicitly
specified.";
}
uses nrp-selector-mpls-label-location;
}
case derived {
leaf forwarding-label {
type empty;
description
"MPLS selector Label is derived from
forwarding label.";
}
}
}
}
leaf-list acl-ref {
type nrp-acl-ref;
description
"Selection is done based on the specified list of ACLs.";
}
}
}
/*
* Grouping - NRP QoS PHB profile
*/
grouping nrp-qos-phb-profile {
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description
"Grouping for NRP QoS PHB profile.";
leaf phb-profile {
type string;
description
"PHB profile identifier.";
}
}
/*
* Grouping - NRP IGP congruent
*/
grouping nrp-igp-congruent {
description
"Grouping for NRP IGP congruent attributes.";
container igp-congruent {
presence "indicates NRP IGP congruent";
description
"The presence of the container node indicates NRP IGP
congruent.";
leaf multi-topology-id {
type uint32;
description
"Indicates the MT-id of the NRP IGP instance.";
}
leaf algo-id {
type uint32;
description
"Indicates the algo-id of the NRP IGP instance.";
}
leaf sharing {
type boolean;
default "true";
description
"'true' if the the NRP IGP instance can be shared with
other NRPs;
'false' if the the NRP IGP instance is dedicated
to this NRP.";
}
}
}
/*
* Grouping - NRP Topology Filter
*/
grouping nrp-topology-filter {
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description
"Grouping for NRP filter topology.";
container filters {
description
"Container for filters.";
list filter {
key "filter-ref";
description
"List of filters.";
leaf filter-ref {
type nrp-topo-filter-ref;
description
"Reference to a specific topology filter from the
list of global topology filters.";
}
uses nrp-resource-reservation;
uses nrp-selector-config;
uses nrp-qos-phb-profile;
}
}
}
/*
* Grouping - NRP Select Topology
*/
grouping nrp-select-topology {
description
"NRP topology specified by selection.";
container select {
description
"The container of NRP select topology.";
list topology-group {
key "group-id";
description
"List of groups for NRP topology elements (node or links)
that share common attributes.";
leaf group-id {
type string;
description
"The NRP topology group identifier.";
}
container base-topology-ref {
description
"Container for the base topology reference.";
uses nw:network-ref;
}
list links {
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key "link-ref";
description
"A list of links with common attributes";
leaf link-ref {
type leafref {
path
"/nw:networks/nw:network[nw:network-id=current()"
+ "/../../base-topology-ref/network-ref]"
+ "/nt:link/nt:link-id";
}
description
"A reference to a link in the base topology.";
}
}
uses nrp-resource-reservation;
leaf link-partition-type {
type identityref {
base nrp-link-partition-type;
}
description
"Indicates the resource reservation type of an NRP link.";
}
uses nrp-qos-phb-profile;
}
}
}
/*
* Grouping - NRP Topology
*/
grouping nrp-topology {
description
"Grouping for NRP topology.";
container topology {
description
"Container for NRP topology.";
uses nrp-igp-congruent;
choice topology-type {
description
"Choice of NRP topology type.";
case selection {
uses nrp-select-topology;
}
case filter {
uses nrp-topology-filter;
}
}
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}
}
/*
* Grouping - NRP Policy
*/
grouping nrp-pol {
description
"Grouping for NRP policies.";
container nrp-policies {
description
"Container for nrp policies.";
list nrp-policy {
key "name";
unique "nrp-id";
description
"List of NRP policies.";
leaf name {
type string;
description
"A string that uniquely identifies the NRP policy.";
}
leaf nrp-id {
type uint32;
description
"A 32-bit ID that uniquely identifies the NRP
created by the enforcement of this NRP policy.";
}
leaf mode {
type identityref {
base nrp-partition-mode;
}
default "nrp-hybrid-plane-partition";
description
"Indicates the resource partition mode of the NRP, such as
control plane partition, data plane partition,
or hybrid partition.";
}
uses nrp-resource-reservation;
uses nrp-selector-config;
uses nrp-qos-phb-profile;
uses nrp-topology;
}
}
}
/*
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* Grouping - NRP Selector State
*/
grouping nrp-selector-state {
description
"The grouping of NRP selector.";
container selector {
config false;
description
"The container of NRP selector.";
leaf srv6 {
type srv6-types:srv6-sid;
description
"Indicates the SRv6 SID value as the NRP selector.";
}
leaf sr-mpls {
type rt-types:mpls-label;
description
"Indicates the SR MPLS ID value as the NRP selector.";
}
}
}
/*
* Grouping - NRP node attributes
*/
grouping nrp-node-attributes {
description
"NRP node scope attributes.";
container nrp {
config false;
description
"Containing NRP attributes.";
uses nrp-selector-state;
}
}
/*
* Grouping - NRP Link Attributes
*/
grouping nrp-link-attributes {
description
"NRP link scope attributes.";
leaf link-partition-type {
type identityref {
base nrp-link-partition-type;
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}
config false;
description
"Indicates the resource partition type of an NRP link.";
}
leaf bandwidth-value {
type uint64;
units "bps";
config false;
description
"Bandwidth allocation for the NRP as absolute value.";
}
uses nrp-selector-state;
}
/*
* Grouping - NRP Bandwidth Metrics
*/
grouping nrp-bandwidth-metrics {
description
"Grouping for NRP bandwidth metrics.";
leaf one-way-available-bandwidth {
type rt-types:bandwidth-ieee-float32;
units "bytes per second";
default "0x0p0";
description
"Available bandwidth that is defined to be NRP link
bandwidth minus bandwidth utilization. For a
bundled link, available bandwidth is defined to be the
sum of the component link available bandwidths.";
}
leaf one-way-utilized-bandwidth {
type rt-types:bandwidth-ieee-float32;
units "bytes per second";
default "0x0p0";
description
"Bandwidth utilization that represents the actual
utilization of the link (i.e. as measured in the router).
For a bundled link, bandwidth utilization is defined to
be the sum of the component link bandwidth
utilizations.";
}
}
// nrp-link-statistics
grouping nrp-statistics-per-link {
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description
"Statistics attributes per NRP link.";
container statistics {
config false;
description
"Statistics for NRP link.";
leaf admin-status {
type te-types:te-admin-status;
description
"The administrative state of the link.";
}
leaf oper-status {
type te-types:te-oper-status;
description
"The current operational state of the link.";
}
uses nrp-bandwidth-metrics;
uses te-packet-types:one-way-performance-metrics-packet;
}
}
grouping nrp-topology-type {
description
"Identifies the topology type to be NRP";
container nrp {
presence "indicates NRP topology";
description
"The presence of the container node indicates NRP
topology";
}
}
/*
* Augment - Network Resource Partition Policies.
*/
augment "/nw:networks" {
description
"Augment networks with network resource partition
policies.";
uses nrp-pol;
}
/*
* Augment - NRP type.
*/
augment "/nw:networks/nw:network/nw:network-types" {
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description
"Introduces new network type for NRP topology";
uses nrp-topology-type;
}
/*
* Augment - NRP node operational status.
*/
augment "/nw:networks/nw:network/nw:node" {
when '../nw:network-types/nrp:nrp' {
description
"Augment only for NRP topology.";
}
description
"Augment node configuration and state.";
uses nrp-node-attributes;
}
/*
* Augment - NRP link operational status.
*/
augment "/nw:networks/nw:network/nt:link" {
when '../nw:network-types/nrp:nrp' {
description
"Augment only for NRP topology.";
}
description
"Augment link configuration and state.";
container nrp {
config false;
description
"Containing NRP attributes.";
uses nrp-link-attributes;
uses nrp-statistics-per-link;
}
}
/*
* Augment - Native topology with node operational status.
*/
augment "/nw:networks/nw:network/nw:node" {
description
"Augment node with NRP aware attributes.";
list nrps {
key "nrp-id";
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config false;
description
"List of NRPs.";
leaf nrp-id {
type uint32;
description
"NRP identifier";
}
uses nrp-node-attributes;
}
}
/*
* Augment - Native topology with link operational status.
*/
augment "/nw:networks/nw:network/nt:link" {
description
"Augment link with NRP attributes.";
list nrps {
key "nrp-id";
config false;
description
"List of NRPs.";
leaf nrp-id {
type uint32;
description
"NRP identifier";
}
uses nrp-link-attributes;
}
}
}
<CODE ENDS>
5. Security Considerations
The YANG model defined in this document is designed to be accessed
via network management protocols such as NETCONF [RFC6241] or
RESTCONF [RFC8040]. The lowest NETCONF layer is the secure transport
layer, and the mandatory-to-implement secure transport is Secure
Shell (SSH) [RFC6242]. The lowest RESTCONF layer is HTTPS, and the
mandatory-to-implement secure transport is TLS [RFC8446].
The NETCONF access control model [RFC8341] provides the means to
restrict access for particular NETCONF or RESTCONF users to a
preconfigured subset of all available NETCONF or RESTCONF protocol
operations and content.
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There are a number of data nodes defined in this YANG model that are
writable/creatable/deletable (i.e., config true, which is the
default). These data nodes may be considered sensitive or vulnerable
in some network environments. Write operations (e.g., edit-config)
to these data nodes without proper protection can have a negative
effect on network operations.
nrp-link: A malicious client could attempt to remove a link from a
topology, add a new link. In each case, the structure of the
topology would be sabotaged, and this scenario could, for example,
result in an NRP topology that is less than optimal.
The entries in the nodes above include the whole network
configurations corresponding with the NRP, and indirectly create or
modify the PE or P device configurations. Unexpected changes to
these entries could lead to service disruption and/or network
misbehavior.
6. IANA Considerations
This document registers a URI in the IETF XML registry [RFC3688].
Following the format in [RFC3688], the following registration is
requested to be made:
URI: urn:ietf:params:xml:ns:yang:ietf-nrp
Registrant Contact: The IESG.
XML: N/A, the requested URI is an XML namespace.
This document requests to register a YANG module in the YANG Module
Names registry [RFC7950].
Name: ietf-nrp
Namespace: urn:ietf:params:xml:ns:yang:ietf-nrp
Maintained by IANA: N
Prefix: nrp
Reference: RFC XXXX
7. Acknowledgments
The authors would like to thank Krzysztof Szarkowicz, Jie Dong, Qin
Wu, Yao Zhao, Zhenbing Li, Ying Cheng, Liyan Gong, and many others
for their helpful comments and suggestions.
8. Contributor
The following individuals, authors of
[I-D.bestbar-teas-yang-nrp-policy] and [I-D.wd-teas-nrp-yang],
contributed to this consolidated document:
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Xufeng Liu
IBM Corporation
Email: xufeng.liu.ietf@gmail.com
Mohamed Boucadair
Orange
Email: mohamed.boucadair@orange.com
Daniele Ceccarelli
Bin Wen
Comcast
Email: Bin_Wen@cable.comcast.com
Ran Chen
ZTE Corporation
Email: chen.ran@zte.com.cn
Luis M. Contreras
Telefonica
Email: luismiguel.contrerasmurillo@telefonica.com
Ying Cheng
China Unicom
Email: chengying10@chinaunicom.cn
Liyan Gong
China Mobile
Email: gongliyan@chinamobile.com
9. References
9.1. Normative References
[RFC3688] Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688,
DOI 10.17487/RFC3688, January 2004,
<https://www.rfc-editor.org/info/rfc3688>.
[RFC4915] Psenak, P., Mirtorabi, S., Roy, A., Nguyen, L., and P.
Pillay-Esnault, "Multi-Topology (MT) Routing in OSPF",
RFC 4915, DOI 10.17487/RFC4915, June 2007,
<https://www.rfc-editor.org/info/rfc4915>.
[RFC5120] Przygienda, T., Shen, N., and N. Sheth, "M-ISIS: Multi
Topology (MT) Routing in Intermediate System to
Intermediate Systems (IS-ISs)", RFC 5120,
DOI 10.17487/RFC5120, February 2008,
<https://www.rfc-editor.org/info/rfc5120>.
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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,
<https://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,
<https://www.rfc-editor.org/info/rfc6242>.
[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>.
[RFC7951] Lhotka, L., "JSON Encoding of Data Modeled with YANG",
RFC 7951, DOI 10.17487/RFC7951, August 2016,
<https://www.rfc-editor.org/info/rfc7951>.
[RFC8040] Bierman, A., Bjorklund, M., and K. Watsen, "RESTCONF
Protocol", RFC 8040, DOI 10.17487/RFC8040, January 2017,
<https://www.rfc-editor.org/info/rfc8040>.
[RFC8340] Bjorklund, M. and L. Berger, Ed., "YANG Tree Diagrams",
BCP 215, RFC 8340, DOI 10.17487/RFC8340, March 2018,
<https://www.rfc-editor.org/info/rfc8340>.
[RFC8341] Bierman, A. and M. Bjorklund, "Network Configuration
Access Control Model", STD 91, RFC 8341,
DOI 10.17487/RFC8341, March 2018,
<https://www.rfc-editor.org/info/rfc8341>.
[RFC8345] Clemm, A., Medved, J., Varga, R., Bahadur, N.,
Ananthakrishnan, H., and X. Liu, "A YANG Data Model for
Network Topologies", RFC 8345, DOI 10.17487/RFC8345, March
2018, <https://www.rfc-editor.org/info/rfc8345>.
[RFC8446] Rescorla, E., "The Transport Layer Security (TLS) Protocol
Version 1.3", RFC 8446, DOI 10.17487/RFC8446, August 2018,
<https://www.rfc-editor.org/info/rfc8446>.
9.2. Informative References
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[I-D.bestbar-teas-yang-nrp-policy]
Beeram, V. P., Saad, T., Wen, B., Ceccarelli, D., Peng,
S., Chen, R., Contreras, L. M., and X. Liu, "YANG Data
Model for Network Resource Partition Policy", Work in
Progress, Internet-Draft, draft-bestbar-teas-yang-nrp-
policy-03, 24 October 2022,
<https://datatracker.ietf.org/doc/html/draft-bestbar-teas-
yang-nrp-policy-03>.
[I-D.ietf-lsr-flex-algo]
Psenak, P., Hegde, S., Filsfils, C., Talaulikar, K., and
A. Gulko, "IGP Flexible Algorithm", Work in Progress,
Internet-Draft, draft-ietf-lsr-flex-algo-26, 17 October
2022, <https://datatracker.ietf.org/doc/html/draft-ietf-
lsr-flex-algo-26>.
[I-D.ietf-lsr-isis-sr-vtn-mt]
Xie, C., Ma, C., Dong, J., and Z. Li, "Using IS-IS Multi-
Topology (MT) for Segment Routing based Virtual Transport
Network", Work in Progress, Internet-Draft, draft-ietf-
lsr-isis-sr-vtn-mt-04, 13 March 2023,
<https://datatracker.ietf.org/doc/html/draft-ietf-lsr-
isis-sr-vtn-mt-04>.
[I-D.ietf-teas-ietf-network-slices]
Farrel, A., Drake, J., Rokui, R., Homma, S., Makhijani,
K., Contreras, L. M., and J. Tantsura, "A Framework for
IETF Network Slices", Work in Progress, Internet-Draft,
draft-ietf-teas-ietf-network-slices-19, 21 January 2023,
<https://datatracker.ietf.org/doc/html/draft-ietf-teas-
ietf-network-slices-19>.
[I-D.ietf-teas-ns-ip-mpls]
Saad, T., Beeram, V. P., Dong, J., Wen, B., Ceccarelli,
D., Halpern, J. M., Peng, S., Chen, R., Liu, X.,
Contreras, L. M., Rokui, R., and L. Jalil, "Realizing
Network Slices in IP/MPLS Networks", Work in Progress,
Internet-Draft, draft-ietf-teas-ns-ip-mpls-02, 13 March
2023, <https://datatracker.ietf.org/doc/html/draft-ietf-
teas-ns-ip-mpls-02>.
[I-D.wd-teas-nrp-yang]
Wu, B., Dhody, D., Boucadair, M., Cheng, Y., and L. Gong,
"A YANG Data Model for Network Resource Partitions
(NRPs)", Work in Progress, Internet-Draft, draft-wd-teas-
nrp-yang-02, 25 September 2022,
<https://datatracker.ietf.org/doc/html/draft-wd-teas-nrp-
yang-02>.
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[RFC8309] Wu, Q., Liu, W., and A. Farrel, "Service Models
Explained", RFC 8309, DOI 10.17487/RFC8309, January 2018,
<https://www.rfc-editor.org/info/rfc8309>.
[RFC9182] Barguil, S., Gonzalez de Dios, O., Ed., Boucadair, M.,
Ed., Munoz, L., and A. Aguado, "A YANG Network Data Model
for Layer 3 VPNs", RFC 9182, DOI 10.17487/RFC9182,
February 2022, <https://www.rfc-editor.org/info/rfc9182>.
[RFC9291] Boucadair, M., Ed., Gonzalez de Dios, O., Ed., Barguil,
S., and L. Munoz, "A YANG Network Data Model for Layer 2
VPNs", RFC 9291, DOI 10.17487/RFC9291, September 2022,
<https://www.rfc-editor.org/info/rfc9291>.
Appendix A. An Example
This section contains an example of an instance data tree in JSON
encoding [RFC7951]. The example below instantiates an NRP for the
topology that is depicted in the following diagram. There are three
nodes, D1, D2, and D3. D1 has three termination points, 1-0-1,
1-2-1, and 1-3-1. D2 has three termination points as well, 2-1-1,
2-0-1, and 2-3-1. D3 has two termination points, 3-1-1 and 3-2-1.
In addition there are six links, two between each pair of nodes with
one going in each direction.
+------------+ +------------+
| D1 | | D2 |
/-\ /-\ /-\ /-\
| | 1-0-1 | |---------------->| | 2-1-1 | |
| | 1-2-1 | |<----------------| | 2-0-1 | |
\-/ 1-3-1 \-/ \-/ 2-3-1 \-/
| /----\ | | /----\ |
+---| |---+ +---| |---+
\----/ \----/
| | | |
| | | |
| | | |
| | +------------+ | |
| | | D3 | | |
| | /-\ /-\ | |
| +----->| | 3-1-1 | |-------+ |
+---------| | 3-2-1 | |<---------+
\-/ \-/
| |
+------------+
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Figure 1: An NRP Instance Example
An corresponding IGP congruent NRP instance data tree is depicted
below:
{
"ietf-network:networks": {
"nrp-policies": {
"nrp-policy": [
{
"name": "NRP1",
"nrp-id": "foo:nrp-example1",
"mode": "nrp-hybrid-plane-partition",
"resource-reservation": {
"bw-value": "10000"
},
"selector": {
"ipv6": {
" ipv6-hbh-eh:": "100"
}
},
"topology": {
"igp-congruent": {
"multi-topology-id": "2"
},
"select": {
"topology-group": [
{
"group-id": "access-group",
"base-topology-ref": {
"network-ref": "native-topology"
},
"link": [
{
"link-ref": "D1,1-2-1,D2,2-1-1"
},
{
"link-ref": "D2,2-1-1,D1,1-2-1"
},
{
"link-ref": "D1,1-3-1,D3,3-1-1"
},
{
"link-ref": "D3,3-1-1,D1,1-3-1"
},
{
"link-ref": "D2,2-3-1,D3,3-2-1"
},
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{
"link-ref": "D3,3-2-1,D2,2-3-1"
}
],
"link-partition-type": "virtual-sub-interface-partition"
}
]
}
}
}
]
}
}
}
Figure 2: Instance data tree
In addition, an exampe of an NRP that supports the control plane
partition mode is shown in the following figure.
{
"ietf-network:networks": {
"nrp-policies": {
"nrp-policy": [
{
"name": "NRP2",
"nrp-id": "foo:nrp-example2",
"mode": "nrp-control-plane-partition",
"resource-reservation": {
"bw-value": "10000"
},
"topology": {
"filters": {
"filter": [
{
"filter-ref": "te-topology-filter1"
}
]
}
}
}
]
}
}
}
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Appendix B. NRP YANG Module Tree
module: ietf-nrp
augment /nw:networks:
+--rw nrp-policies
+--rw nrp-policy* [name]
+--rw name string
+--rw nrp-id? uint32
+--rw mode? identityref
+--rw resource-reservation
| +--rw (max-bw-type)?
| +--:(bw-value)
| | +--rw maximum-bandwidth? uint64
| +--:(bw-percentage)
| +--rw maximum-bandwidth-percent?
| rt-types:percentage
+--rw selector
| +--rw ipv4
| | +--rw destination-prefix* inet:ipv4-prefix
| +--rw ipv6
| | +--rw (selector-type)?
| | +--:(dedicated)
| | | +--rw ipv6-hbh-eh? uint32
| | +--:(srv6-sid-derived)
| | | +--rw srv6-sid*
| | | inet:ipv6-prefix
| | +--:(ipv6-destination-derived)
| | +--rw destination-prefix*
| | inet:ipv6-prefix
| +--rw mpls
| | +--rw (selector-type)?
| | +--:(dedicated)
| | | +--rw label?
| | | | rt-types:mpls-label
| | | +--rw label-position? identityref
| | | +--rw label-position-offset? uint8
| | +--:(derived)
| | +--rw forwarding-label? empty
| +--rw acl-ref* nrp-acl-ref
+--rw phb-profile? string
+--rw topology
+--rw igp-congruent!
| +--rw multi-topology-id? uint32
| +--rw algo-id? uint32
| +--rw sharing? boolean
+--rw (topology-type)?
+--:(selection)
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| +--rw select
| +--rw topology-group* [group-id]
| +--rw group-id string
| +--rw base-topology-ref
| | +--rw network-ref? leafref
| +--rw links* [link-ref]
| | +--rw link-ref leafref
| +--rw resource-reservation
| | +--rw (max-bw-type)?
| | +--:(bw-value)
| | | +--rw maximum-bandwidth?
| | | uint64
| | +--:(bw-percentage)
| | +--rw maximum-bandwidth-percent?
| | rt-types:percentage
| +--rw link-partition-type?
| | identityref
| +--rw phb-profile? string
+--:(filter)
+--rw filters
+--rw filter* [filter-ref]
+--rw filter-ref
| nrp-topo-filter-ref
+--rw resource-reservation
| +--rw (max-bw-type)?
| +--:(bw-value)
| | +--rw maximum-bandwidth?
| | uint64
| +--:(bw-percentage)
| +--rw maximum-bandwidth-percent?
| rt-types:percentage
+--rw selector
| +--rw ipv4
| | +--rw destination-prefix*
| | inet:ipv4-prefix
| +--rw ipv6
| | +--rw (selector-type)?
| | +--:(dedicated)
| | | +--rw ipv6-hbh-eh?
| | | uint32
| | +--:(srv6-sid-derived)
| | | +--rw srv6-sid*
| | | inet:ipv6-prefix
| | +--:(ipv6-destination-derived)
| | +--rw destination-prefix*
| | inet:ipv6-prefix
| +--rw mpls
| | +--rw (selector-type)?
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| | +--:(dedicated)
| | | +--rw label?
| | | | rt-types:mpls-label
| | | +--rw label-position?
| | | | identityref
| | | +--rw label-position-offset?
| | | uint8
| | +--:(derived)
| | +--rw forwarding-label?
| | empty
| +--rw acl-ref* nrp-acl-ref
+--rw phb-profile? string
augment /nw:networks/nw:network/nw:network-types:
+--rw nrp!
augment /nw:networks/nw:network/nw:node:
+--ro nrp
+--ro selector
+--ro srv6? srv6-types:srv6-sid
+--ro sr-mpls? rt-types:mpls-label
augment /nw:networks/nw:network/nt:link:
+--ro nrp
+--ro link-partition-type? identityref
+--ro bandwidth-value? uint64
+--ro selector
| +--ro srv6? srv6-types:srv6-sid
| +--ro sr-mpls? rt-types:mpls-label
+--ro statistics
+--ro admin-status?
| te-types:te-admin-status
+--ro oper-status?
| te-types:te-oper-status
+--ro one-way-available-bandwidth?
| rt-types:bandwidth-ieee-float32
+--ro one-way-utilized-bandwidth?
| rt-types:bandwidth-ieee-float32
+--ro one-way-min-delay? uint32
+--ro one-way-max-delay? uint32
+--ro one-way-delay-variation? uint32
+--ro one-way-packet-loss? decimal64
augment /nw:networks/nw:network/nw:node:
+--ro nrps* [nrp-id]
+--ro nrp-id uint32
+--ro nrp
+--ro selector
+--ro srv6? srv6-types:srv6-sid
+--ro sr-mpls? rt-types:mpls-label
augment /nw:networks/nw:network/nt:link:
+--ro nrps* [nrp-id]
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+--ro nrp-id uint32
+--ro link-partition-type? identityref
+--ro bandwidth-value? uint64
+--ro selector
+--ro srv6? srv6-types:srv6-sid
+--ro sr-mpls? rt-types:mpls-label
Authors' Addresses
Bo Wu
Huawei Technologies
101 Software Avenue, Yuhua District
Nanjing
Jiangsu, 210012
China
Email: lana.wubo@huawei.com
Dhruv Dhody
Huawei Technologies
Divyashree Techno Park
Bangalore 560066
Karnataka
India
Email: dhruv.ietf@gmail.com
Vishnu Pavan Beeram
Juniper Networks
Email: vbeeram@juniper.net
Tarek Saad
Cisco Systems
Email: tsaad.net@gmail.com
Shaofu Peng
ZTE Corporation
Email: peng.shaofu@zte.com.cn
Wu, et al. Expires 9 October 2023 [Page 35]
