| Internet-Draft | Network and VPN Service PM YANG | September 2022 |
| Wu, et al. | Expires 27 March 2023 | [Page] |
The data model for network topologies defined in RFC 8345 introduces vertical layering relationships between networks that can be augmented to cover network and service topologies. This document defines a YANG module for performance monitoring (PM) of both underlay networks and overlay VPN services that can be used to monitor and manage network performance on the topology of both layers.¶
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 27 March 2023.¶
Copyright (c) 2022 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 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.¶
[RFC8969] describes a framework for automating service and network management with YANG [RFC7950] models. It defines that the performance measurement telemetry model should be tied to the services (such as a Layer 3 VPN or Layer 2 VPN) or to the network models to monitor the overall network performance and the Service Level Agreements (SLAs).¶
The performance of VPN services is associated with the performance changes of the underlay network that carries VPN services, such as the delay of the links between two directly connected devices and the packet loss status of the device interfaces. Additionally, the integration of Layer 2/Layer 3 VPN performance and network performance data enables the orchestrator to subscribe to VPN service performance in a unified manner. Therefore, this document defines a YANG module for both network and VPN service performance monitoring (PM). The module can be used to monitor and manage network performance on the topology level or the service topology between VPN sites, in particular.¶
This document does not introduce new metrics for network performance or mechanisms for measuring network performance, but uses the existing mechanisms and statistics to monitor the performance of the network and the services. All these metrics are defined as unidirectional metrics.¶
The YANG module defined in this document is designed as an augmentation to the network topology YANG model defined in [RFC8345] and draws on relevant YANG types defined in [RFC6991], [RFC8345], [RFC8532], and [RFC9181].¶
Appendix A provides a set of examples to illustrate the use of the module.¶
The following terms are defined in [RFC7950] and are used in this specification:¶
The terminology for describing YANG data models is found in [RFC7950].¶
The tree diagrams used in this document follow the notation defined in [RFC8340].¶
The following acronyms are used in the document:¶
Models are key for automating network management operations. According to [RFC8969], together with service and network models, performance measurement telemetry models are needed to monitor network performance to meet specific service requirements (typically captured in an SLA).¶
+---------------+
| Customer |
+-------+-------+
|
Customer Service Models |
|
+-------+---------+
| Service |
| Orchestration |
+------+-+--------+
| |
Network Service Models | | Network and VPN Service PM Models
| |
+------+-+--------+
| Network |
| Controller |
+-------+---------+
|
+-----------------------+------------------------+
Network
As shown in Figure 1, in the context of the layered model architecture described in [RFC8309], the network and VPN service performance monitoring (PM) model can be used to expose operational performance information to the layer above, e.g., to an orchestrator or other client application, via standard network management APIs.¶
Before using the model, the controller needs to establish complete topology visibility of the network and VPN. For example, the controller can use network information from [RFC8345], [I-D.ietf-opsawg-sap] or VPN information from [RFC9182], [I-D.ietf-opsawg-l2nm]. Then the controller derives network or VPN level performance data by aggregating (and filtering) lower-level data collected via monitoring counters of the involved devices.¶
The network or VPN performance data can be based on different sources. For example, the performance monitoring data per link in the underlying network can be collected using a network performance measurement method such as One-Way Active Measurement Protocol (OWAMP) [RFC4656], Two-Way Active Measurement Protocol (TWAMP) [RFC5357], Simple Two-way Active Measurement Protocol(STAMP) [RFC8762], and Multiprotocol Label Switching (MPLS) Loss and Delay Measurement [RFC6374]. The performance monitoring information reflecting the quality of the network or VPN service (e.g., end-to-end network performance data between source node and destination node in the network or between VPN sites) can be computed and aggregated, for example, using the information from the Traffic Engineering Database (TED), [RFC7471] [RFC8570] [RFC8571] or LMAP (Large-Scale Measurement Platform) [RFC8194].¶
The measurement and report intervals that are associated with these performance data usually depend on the configuration of the specific measurement method or collection method or various combinations. This document defines a network-wide measurement interval to align measurement requirements for networks or VPN services.¶
Some applications such as service-assurance applications, which must maintain a continuous view of operational data and state, can use the subscription model specified in [RFC8641] to subscribe to the specific network performance data or VPN service performance data they are interested in, at the data source. For example, network or VPN topology updates may be obtained through on-change notifications [RFC8641]. For dynamic PM data, e.g. VRF routes or MAC entries, link metrics, and interface metrics, various notifications can be specified to obtain more complete data. A periodic notification [RFC8641] can be specified to obtain real-time performance data. For devices/controllers that maintain historical performance data for a period of time, a replay notification [RFC5277] or [RFC8639] can be used to obtain the historical data. And alarm notifications [RFC8632] can be specified to get alarms for the metrics which exceed or fall below the performance threshold.¶
The data source can, then, use the network and VPN service performance monitoring model defined in this document and the YANG Push model [RFC8641] to distribute specific telemetry data to target recipients.¶
To obtain a snapshot of a large amount of performance data from a network topology or VPN network, service-assurance applications may retrieve information using the network and VPN service PM model through a NETCONF [RFC6241] or a RESTCONF [RFC8040] interface. For example, a specified "link-id" of a VPN can be used as a filter in a RESTCONF GET request to retrieve per-link VPN PM data.¶
This document defines the YANG module, "ietf-network-vpn-pm", which is an augmentation to the "ietf-network" and "ietf-network-topology" modules as shown in Figure 2.¶
+----------------------+ +---------------------+
|ietf-network | | |
|ietf-network-topology |<---------| ietf-network-vpn-pm |
+----------------------+ augments | |
+---------------------+
[RFC8345] defines a YANG data model for network/service topologies and inventories. The service topology described in [RFC8345] includes the virtual topology for a service layer above Layer 1 (L1), Layer 2 (L2), and Layer 3 (L3). This service topology has the generic topology elements of node, link, and terminating point. One typical example of a service topology is described in Figure 3 of [RFC8345]: two VPN service topologies instantiated over a common L3 topology. Each VPN service topology is mapped onto a subset of nodes from the common L3 topology.¶
Figure 3 illustrates an example of a topology that maps between the VPN service topology and an underlying network:¶
VPN 1 VPN 2
+------------------------+ +------------------------+
/ / / /
/ S1C_[VN3]::: / / /
/ \ ::::: / / S2A_[VN1]____[VN3]_S2B /
/ \ ::: / / : : / Overlay
/ \ :::::::::::: : : /
/ S1B_[VN2]____[VN1]_S1A / / : : /
+---------:-------:------+ +-------:-:----------:---+
: : :::::::::::: : :
: : : : :
Site-1A : +-------:-:------------------:-------:-----+ Site-1C
[CE1]___:_/_______[N1]___________________[N2]___:____/__[CE3]
:/ / / \ _____// : /
[CE5]_____:_______/ / \ _____/ / :: /
Site-2A /: / \ / / :: /
/ : [N5] / :: / Underlay Network
/ : / __/ \__ / :: /
/ : / ___/ \__ /:: /
Site-1B / : / ___/ \ /: / Site-2B
[CE2]__/________[N4]__________________[N3]________/____[CE4]
/ /
+------------------------------------------+
Legend:
N:Node VN:VPN-Node S:Site CE:Customer Edge
__ Link within a network layer
: Mapping between network layers
As shown in Figure 3, two VPN services topologies are built on top of one common underlying physical network:¶
Apart from the association between the VPN topology and the underlay topology, VPN Network PM YANG module can also provide the performance status of the underlay network and VPN services. For example, the module can provide link PM statistics and port statistics of an underlay network. And it can also provide VPN PM statistics, which can be further split into PM for the VPN tunnel and PM at the VPN PE access node, as illustrated in the following diagram.¶
+-----------------------------------------------------+
| |
| VPN2 Link |
| |<-------------------->| |
| | | |
| VPN2+---+---+ +---+---+VPN2 |
| TP1| VN1 | Tunnel PM | VN3 |TP2 |
| ---+ PE A |==============| PE B +---- |
|vpn-access+-------+ +-------+ vpn-access|
|-interface| | -interface|
| |##############################| |
| |inter-vpn-access-interface PM | |
| |
+-----------------------------------------------------+
| |
| |
+----+ | TP+-----+ Link +---+ Link +-----+TP | +----+
| CE4+-+----------+ N1 +-------+-N2+-------+ N3 +----------+-+CE5 |
+----+ | 1-1+-----+1-2 2-1+---+2-2 3-1+-----+3-2 | +----+
| |
| |
+-----------------------------------------------------+
Legend:
N:node VN:VPN-Node TP:Termination Point
-:Link
Figure 4 illustrates an example of VPN PM and two VPN PM measurement methods including the VPN tunnel PM and the inter-VPN-access interface PM. VPN PM can also provide statistics on VPN access interfaces, the number of current VRF routes or L2VPN MAC entry of VPN node.¶
The model can be used for performance monitoring both for the underlay network and the VPN services. The two would be separate entries in the network list [RFC8345]. The differences are as follows:¶
The tree in Figure 5 is a part of "ietf-network-vpn-pm" tree. It also defines the following set of network level attributes:¶
module: ietf-network-vpn-pm
augment /nw:networks/nw:network/nw:network-types:
+--rw service!
+--rw service-type identityref
+--rw vpn-id? vpn-common:vpn-id
+--rw vpn-service-topology? identityref
The tree in Figure 6 is the node part of "ietf-network-vpn-pm" tree.¶
For network performance monitoring, the module defines the following attributes:¶
For VPN service performance monitoring, the module defines one attribute:¶
augment /nw:networks/nw:network/nw:node:
+--rw node-type? identityref
+--ro entry-summary
+--ro ipv4-num
| +--ro maximum-routes? uint32
| +--ro total-active-routes? uint32
+--ro ipv6-num
| +--ro maximum-routes? uint32
| +--ro total-active-routes? uint32
+--ro mac-num
+--ro mac-num-limit? uint32
+--ro total-active-mac-num? uint32
augment /nw:networks/nw:network/nw:node:
+--rw role? identityref
The tree in Figure 7 is the link and termination point (TP) part of ietf-network-vpn-pm tree.¶
The 'links' are classified into two types: topology link defined in [RFC8345] and abstract link of a VPN between PEs defined in this module.¶
The performance data of a link is a collection of counters and gauges that report the performance status.¶
augment /nw:networks/nw:network/nt:link:
+--rw perf-mon
+--rw low-percentile? percentile
+--rw intermediate-percentile? percentile
+--rw high-percentile? percentile
+--rw measurement-interval? uint32
+--ro pm* [pm-type]
| +--ro pm-type identityref
| +--ro pm-attributes
| +--ro start-time? yang:date-and-time
| +--ro end-time? yang:date-and-time
| +--ro pm-source? identityref
| +--ro one-way-pm-statistics
| | +--ro loss-statistics
| | | +--ro packet-loss-count? yang:counter64
| | | +--ro loss-ratio? percentage
| | +--ro delay-statistics
| | | +--ro unit-value? identityref
| | | +--ro min-delay-value? yang:gauge64
| | | +--ro max-delay-value? yang:gauge64
| | | +--ro low-delay-percentile? yang:gauge64
| | | +--ro intermediate-delay-percentile? yang:gauge64
| | | +--ro high-delay-percentile? yang:gauge64
| | +--ro jitter-statistics
| | +--ro unit-value? identityref
| | +--ro min-jitter-value? yang:gauge64
| | +--ro max-jitter-value? yang:gauge64
| | +--ro low-jitter-percentile? yang:gauge64
| | +--ro intermediate-jitter-percentile? yang:gauge64
| | +--ro high-jitter-percentile? yang:gauge64
| +--ro one-way-pm-statistics-per-class* [class-id]
| +--ro class-id string
| +--ro loss-statistics
| | +--ro packet-loss-count? yang:counter64
| | +--ro loss-ratio? percentage
| +--ro delay-statistics
| | +--ro unit-value? identityref
| | +--ro min-delay-value? yang:gauge64
| | +--ro max-delay-value? yang:gauge64
| | +--ro low-delay-percentile? yang:gauge64
| | +--ro intermediate-delay-percentile? yang:gauge64
| | +--ro high-delay-percentile? yang:gauge64
| +--ro jitter-statistics
| +--ro unit-value? identityref
| +--ro min-jitter-value? yang:gauge64
| +--ro max-jitter-value? yang:gauge64
| +--ro low-jitter-percentile? yang:gauge64
| +--ro intermediate-jitter-percentile? yang:gauge64
| +--ro high-jitter-percentile? yang:gauge64
+--rw vpn-pm-type
+--rw inter-vpn-access-interface
| +--rw inter-vpn-access-interface? empty
+--rw vpn-tunnel!
+--ro vpn-tunnel-type? identityref
augment /nw:networks/nw:network/nw:node/nt:termination-point:
+--ro pm-statistics
+--ro last-updated? yang:date-and-time
+--ro inbound-octets? yang:counter64
+--ro inbound-unicast? yang:counter64
+--ro inbound-non-unicast? yang:counter64
+--ro inbound-discards? yang:counter64
+--ro inbound-errors? yang:counter64
+--ro inbound-unknown-protocol? yang:counter64
+--ro outbound-octets? yang:counter64
+--ro outbound-unicast? yang:counter64
+--ro outbound-non-unicast? yang:counter64
+--ro outbound-discards? yang:counter64
+--ro outbound-errors? yang:counter64
+--ro vpn-network-access* [network-access-id]
+--ro network-access-id vpn-common:vpn-id
+--ro last-updated? yang:date-and-time
+--ro inbound-octets? yang:counter64
+--ro inbound-unicast? yang:counter64
+--ro inbound-non-unicast? yang:counter64
+--ro inbound-discards? yang:counter64
+--ro inbound-errors? yang:counter64
+--ro inbound-unknown-protocol? yang:counter64
+--ro outbound-octets? yang:counter64
+--ro outbound-unicast? yang:counter64
+--ro outbound-non-unicast? yang:counter64
+--ro outbound-discards? yang:counter64
+--ro outbound-errors? yang:counter64
For the data nodes of 'link' depicted in Figure 7, the YANG module defines the following minimal set of link-level performance attributes:¶
For the data nodes of 'termination-point' depicted in Figure 7, the module defines the following minimal set of statistics:¶
The "ietf-network-vpn-pm" module uses types defined in [RFC8345], [RFC6991], [RFC8532], and [RFC9181].¶
<CODE BEGINS> file "ietf-network-vpn-pm@2022-09-23.yang"
module ietf-network-vpn-pm {
yang-version 1.1;
namespace "urn:ietf:params:xml:ns:yang:ietf-network-vpn-pm";
prefix nvp;
import ietf-yang-types {
prefix yang;
reference
"RFC 6991: Common YANG Types";
}
import ietf-vpn-common {
prefix vpn-common;
reference
"RFC 9181: A Common YANG Data Model for Layer 2 and
Layer 3 VPNs.";
}
import ietf-network {
prefix nw;
reference
"RFC 8345: A YANG Data Model for Network
Topologies, Section 6.1";
}
import ietf-network-topology {
prefix nt;
reference
"RFC 8345: A YANG Data Model for Network
Topologies, Section 6.2";
}
import ietf-lime-time-types {
prefix lime;
reference
"RFC 8532: Generic YANG Data Model for the Management of
Operations, Administration, and Maintenance (OAM) Protocols
That Use Connectionless Communications";
}
organization
"IETF OPSAWG (Operations and Management Area Working Group)";
contact
"WG Web: <https://datatracker.ietf.org/wg/opsawg/>
WG List: <mailto:opsawg@ietf.org>
Editor: Bo Wu
<lana.wubo@huawei.com>
Editor: Mohamed Boucadair
<mohamed.boucadair@orange.com>
Editor: Qin Wu
<bill.wu@huawei.com>
Author: Oscar Gonzalez de Dios
<oscar.gonzalezdedios@telefonica.com>
Author: Bin Wen
<bin_wen@comcast.com>";
description
"This module defines a model for Network and VPN Service
Performance monitoring.
Copyright (c) 2022 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.";
// RFC Ed.: update the date below with the date of RFC
// publication and remove this note.
// RFC Ed.: replace XXXX with actual RFC number and remove
// this note.
revision 2022-09-23 {
description
"Initial revision.";
reference
"RFC XXXX: A YANG Model for Network and VPN Service
Performance Monitoring";
}
identity node-type {
description
"Base identity for node type";
}
identity pe {
base node-type;
description
"Provider Edge (PE) node type. A PE is the device
or set of devices at the edge of the provider network with the
functionality that is needed to interface with the customer.";
}
identity p {
base node-type;
description
"Provider router node type. That is, a router
in the core network that does not have interfaces
directly toward a customer.";
}
identity asbr {
base node-type;
description
"Autonomous System Border Router (ASBR) node type.";
reference
"RFC 4364: BGP/MPLS IP Virtual Private Networks (VPNs)";
}
identity pm-source-type {
description
"Base identity from which specific performance monitoring
mechanism types are derived.";
}
identity pm-source-bgpls {
base pm-source-type;
description
"Indicates BGP-LS as the performance monitoring metric source";
reference
"RFC 8571: BGP - Link State (BGP-LS) Advertisement of
IGP Traffic Engineering Performance Metric Extensions";
}
identity pm-source-owamp {
base pm-source-type;
description
"Indicates One-Way Active Measurement Protocol(OWAMP)
as the performance monitoring metric source.";
reference
"RFC 4656: A One-Way Active Measurement Protocol (OWAMP)";
}
identity pm-source-twamp {
base pm-source-type;
description
"Indicates Two-Way Active Measurement Protocol(TWAMP)
as the performance monitoring metric source.";
reference
"RFC 5357: A Two-Way Active Measurement Protocol (TWAMP)";
}
identity pm-source-stamp {
base pm-source-type;
description
"Indicates Simple Two-way Active Measurement Protocol(STAMP)
as the performance monitoring metric source.";
reference
"RFC 8762: Simple Two-Way Active Measurement Protocol";
}
identity pm-source-y-1731 {
base pm-source-type;
description
"Indicates Ethernet OAM Y.1731 as the performance monitoring
metric source.";
reference
"ITU-T Y.1731: Operations, administration and
maintenance (OAM) functions and mechanisms
for Ethernet-based networks";
}
identity pm-type {
description
"Base identity for PM type.";
}
identity pm-type-network-link {
base pm-type;
description
"Indicates that the PM type is for the link in
the network topology.";
}
identity pm-type-vpn-inter-access {
base pm-type;
description
"Indicates that the PM type is for logical point-to-point VPN
connections between a source and a destination VPN access
interfaces.";
}
identity pm-type-vpn-tunnel {
base pm-type;
description
"Indicates that the PM type is for VPN tunnels.";
}
typedef percentage {
type decimal64 {
fraction-digits 5;
range "0..100";
}
description
"Percentage to 5 decimal places.";
}
typedef percentile {
type decimal64 {
fraction-digits 2;
range "0..100";
}
description
"The percentile is a value between 0 and 100
to 2 decimal places, e.g. 10.00, 99.90 ,99.99 etc..
For example, for a given one-way delay measurement,
if the percentile is set to 95.00 and the 95th percentile
one-way delay is 2 milliseconds, then the 95 percent of
the sample value is less than or equal to 2 milliseconds.";
}
grouping entry-summary {
description
"Entry summary grouping used for network topology
augmentation.";
container entry-summary {
config false;
description
"Container for VPN or network entry summary.";
container ipv4-num {
leaf maximum-routes {
type uint32;
description
"Indicates the maximum number of IPv4 routes
for the VPN or network.";
}
leaf total-active-routes {
type uint32;
description
"Indicates total active IPv4 routes
for the VPN or network.";
}
description
"IPv4-specific parameters.";
}
container ipv6-num {
leaf maximum-routes {
type uint32;
description
"Indicates the maximum number of IPv6 routes
for the VPN or network.";
}
leaf total-active-routes {
type uint32;
description
"Indicates total active IPv6 routes
for the VPN or network.";
}
description
"IPv6-specific parameters.";
}
container mac-num {
leaf mac-num-limit {
type uint32;
description
"Indicates the maximum number of MAC entries
for the VPN or network.";
}
leaf total-active-mac-num {
type uint32;
description
"Indicates the total active MAC entries
for the VPN or network.";
}
description
"MAC statistics.";
}
}
}
grouping link-loss-statistics {
description
"Grouping for per link error statistics.";
container loss-statistics {
description
"One-way link loss summarized information.";
reference
"RFC 4656: A One-way Active Measurement Protocol (OWAMP)
ITU-T Y.1731: Operations, administration and
maintenance (OAM) functions and mechanisms
for Ethernet-based networks";
leaf packet-loss-count {
type yang:counter64;
description
"Total number of lost packets.";
}
leaf loss-ratio {
type percentage;
description
"Loss ratio of the packets. Express as percentage
of packets lost with respect to packets sent.";
}
}
}
grouping link-delay-statistics {
description
"Grouping for per link delay statistics.";
container delay-statistics {
description
"One-way link delay summarized information.";
reference
"RFC 4656: A One-way Active Measurement Protocol (OWAMP)
ITU-T Y.1731: Operations, administration and
maintenance (OAM) functions and mechanisms
for Ethernet-based networks";
leaf unit-value {
type identityref {
base lime:time-unit-type;
}
default "lime:milliseconds";
description
"Time units, where the options are hours, minutes, seconds,
milliseconds, microseconds, and nanoseconds.";
}
leaf min-delay-value {
type yang:gauge64;
description
"Minimum observed one-way delay.";
}
leaf max-delay-value {
type yang:gauge64;
description
"Maximum observed one-way delay.";
}
leaf low-delay-percentile {
type yang:gauge64;
description
"Low percentile of observed one-way delay with
specific measurement method.";
}
leaf intermediate-delay-percentile {
type yang:gauge64;
description
"Intermediate percentile of observed one-way delay with
specific measurement method.";
}
leaf high-delay-percentile {
type yang:gauge64;
description
"High percentile of observed one-way delay with
specific measurement method.";
}
}
}
grouping link-jitter-statistics {
description
"Grouping for per link jitter statistics.";
container jitter-statistics {
description
"One-way link jitter summarized information.";
reference
"RFC 3393: IP Packet Delay Variation Metric
for IP Performance Metrics (IPPM)
RFC 4656: A One-way Active Measurement Protocol (OWAMP)
ITU-T Y.1731: Operations, administration and
maintenance (OAM) functions and mechanisms
for Ethernet-based networks";
leaf unit-value {
type identityref {
base lime:time-unit-type;
}
default "lime:milliseconds";
description
"Time units, where the options are hours, minutes, seconds,
milliseconds, microseconds, and nanoseconds.";
}
leaf min-jitter-value {
type yang:gauge64;
description
"Minimum observed one-way jitter.";
}
leaf max-jitter-value {
type yang:gauge64;
description
"Maximum observed one-way jitter.";
}
leaf low-jitter-percentile {
type yang:gauge64;
description
"Low percentile of observed one-way jitter.";
}
leaf intermediate-jitter-percentile {
type yang:gauge64;
description
"Intermediate percentile of observed one-way jitter.";
}
leaf high-jitter-percentile {
type yang:gauge64;
description
"High percentile of observed one-way jitter.";
}
}
}
grouping tp-svc-telemetry {
leaf last-updated {
type yang:date-and-time;
config false;
description
"Indicates the time when the counters were last updated.";
}
leaf inbound-octets {
type yang:counter64;
description
"The total number of octets received on the
interface, including framing characters.";
}
leaf inbound-unicast {
type yang:counter64;
description
"The total number of inbound unicast packets.";
}
leaf inbound-non-unicast {
type yang:counter64;
description
"The total number of inbound non-unicast
(i.e., broadcast or multicast) packets.";
}
leaf inbound-discards {
type yang:counter64;
description
"The number of inbound packets that were chosen to be
discarded even though no errors had been detected.
Possible reasons for discarding such a packet could
be to free up buffer space, not enough buffer for
too much data, etc.";
}
leaf inbound-errors {
type yang:counter64;
description
"The number of inbound packets that contained errors.";
}
leaf inbound-unknown-protocol {
type yang:counter64;
description
"The number of packets received via the interface
which were discarded because of an unknown or
unsupported protocol.";
}
leaf outbound-octets {
type yang:counter64;
description
"The total number of octets transmitted out of the
interface, including framing characters.";
}
leaf outbound-unicast {
type yang:counter64;
description
"The total number of outbound unicast packets.";
}
leaf outbound-non-unicast {
type yang:counter64;
description
"The total number of outbound non unicast
(i.e., broadcast or multicast) packets.";
}
leaf outbound-discards {
type yang:counter64;
description
"The number of outbound packets which were chosen
to be discarded even though no errors had been
detected to prevent their being transmitted.
Possible reasons for discarding such a packet could
be to free up buffer space, not enough buffer for
too much data, etc.";
}
leaf outbound-errors {
type yang:counter64;
description
"The number of outbound packets that contained
errors.";
}
description
"Grouping for interface service telemetry.";
}
augment "/nw:networks/nw:network/nw:network-types" {
description
"Defines the service topologies types.";
container service {
presence
"Presence of the container indicates performance monitoring
of the VPN service, and absence of the container indicates
performance monitoring of the network itself.";
description
"Container for VPN service.";
leaf service-type {
type identityref {
base vpn-common:service-type;
}
mandatory true;
description
"This indicates the network service type,
e.g., L3VPN, VPLS, etc.";
}
leaf vpn-id {
type vpn-common:vpn-id;
description
"VPN identifier.";
}
leaf vpn-service-topology {
type identityref {
base vpn-common:vpn-topology;
}
description
"VPN service topology, e.g., hub-spoke, any-to-any,
hub-spoke-disjoint.";
}
}
}
augment "/nw:networks/nw:network/nw:node" {
description
"Augments the network node with other general attributes.";
leaf node-type {
type identityref {
base node-type;
}
description
"Node type, e.g., PE, P, ASBR.";
}
uses entry-summary;
}
augment "/nw:networks/nw:network/nw:node" {
when '../nw:network-types/nvp:service' {
description
"Augments for VPN service PM.";
}
description
"Augments the network node with VPN service attributes.";
leaf role {
type identityref {
base vpn-common:role;
}
default "vpn-common:any-to-any-role";
description
"Role of the node in the VPN service topology.";
}
}
augment "/nw:networks/nw:network/nt:link" {
description
"Augments the network topology link with performance
monitoring attributes.";
container perf-mon {
description
"Container for PM attributes.";
leaf low-percentile {
type percentile;
default "10.00";
description
"Low percentile to report. Setting low-percentile
into 0.00 indicates the client is not interested
in receiving low percentile.";
}
leaf intermediate-percentile {
type percentile;
default "50.00";
description
"Intermediate percentile to report. Setting
intermediate-percentile into 0.00 indicates the client
is not interested in receiving intermediate percentile.";
}
leaf high-percentile {
type percentile;
default "95.00";
description
"High percentile to report. Setting high-percentile
into 0.00 indicates the client is not interested in
receiving high percentile.";
}
leaf measurement-interval {
type uint32 {
range "1..max";
}
units "seconds";
default "60";
description
"Indicates the time interval to perform PM
measurement over.";
}
list pm {
key "pm-type";
config false;
description
"The list of PM based on PM type";
leaf pm-type {
type identityref {
base pm-type;
}
config false;
description
"The PM type of the measured PM attributes";
}
container pm-attributes {
description
"Container for PM attributes.";
leaf start-time {
type yang:date-and-time;
config false;
description
"The date and time the measurement last started.";
}
leaf end-time {
type yang:date-and-time;
config false;
description
"The date and time the measurement last ended.";
}
leaf pm-source {
type identityref {
base pm-source-type;
}
config false;
description
"The OAM tool used to collect the PM data.";
}
container one-way-pm-statistics {
config false;
description
"Container for link telemetry attributes.";
uses link-loss-statistics;
uses link-delay-statistics;
uses link-jitter-statistics;
}
list one-way-pm-statistics-per-class {
key "class-id";
config false;
description
"The list of PM data based on class of service.";
leaf class-id {
type string;
description
"The class-id is used to identify the
class of service. This identifier is internal
to the administration.";
}
uses link-loss-statistics;
uses link-delay-statistics;
uses link-jitter-statistics;
}
}
}
}
}
augment "/nw:networks/nw:network/nt:link/perf-mon" {
when '../../nw:network-types/nvp:service' {
description
"Augments for VPN service PM.";
}
description
"Augments the network topology link with VPN service
performance monitoring attributes.";
container vpn-pm-type {
description
"The VPN PM type of this logical point-to-point
unidirectional VPN link.";
container inter-vpn-access-interface {
description
"Indicates inter-vpn-access-interface PM, which is to
monitor the performance of logical point-to-point VPN
connections between a source and a destination
VPN access interfaces.";
leaf inter-vpn-access-interface {
type empty;
description
"This is a placeholder for inter-vpn-access-interface PM,
which is not bound to a specific VPN access interface.
The source or destination VPN access interface
of the measurement can be augmented as needed.";
}
}
container vpn-tunnel {
presence "Enables VPN tunnel PM";
description
"Indicates VPN tunnel PM, which is to monitor
the performance of VPN tunnels.";
leaf vpn-tunnel-type {
type identityref {
base vpn-common:protocol-type;
}
config false;
description
"The leaf indicates the VPN tunnel type, e.g.,
Generic Routing Encapsulation (GRE),
Generic Network Virtualization Encapsulation (Geneve),
etc.";
}
}
}
}
augment
"/nw:networks/nw:network/nw:node/nt:termination-point" {
description
"Augments the network topology termination point with
performance monitoring attributes.";
container pm-statistics {
config false;
description
"Container for termination point PM attributes.";
uses tp-svc-telemetry;
}
}
augment "/nw:networks/nw:network/nw:node"
+ "/nt:termination-point/pm-statistics" {
when '../../../nw:network-types/nvp:service' {
description
"Augments for VPN service PM.";
}
description
"Augments the network topology termination-point with
VPN service performance monitoring attributes";
list vpn-network-access {
key "network-access-id";
description
"The list of PM based on VPN network accesses.";
leaf network-access-id {
type vpn-common:vpn-id;
description
"The reference to an identifier for the VPN network
access.";
}
uses tp-svc-telemetry;
}
}
}
<CODE ENDS>¶
The YANG module specified in this document defines a schema for data that 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 Network Configuration Access Control Model (NACM) [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.¶
There are a number of data nodes defined in this YANG module 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. These are the subtrees and data nodes and their sensitivity/vulnerability:¶
Some readable data nodes in this YANG module may be considered sensitive or vulnerable in some network environments. It is thus important to control read access (e.g., via get, get-config, or notification) to these data nodes. These are the subtrees and data nodes and their sensitivity/vulnerability:¶
This YANG module does not define any RPC (Remote Procedure Call) operations and Actions.¶
This document requests IANA to register the following URI in the "ns" subregistry within the "IETF XML Registry" [RFC3688]:¶
URI: urn:ietf:params:xml:ns:yang:ietf-network-vpn-pm Registrant Contact: The IESG. XML: N/A, the requested URI is an XML namespace.¶
This document requests IANA to register the following YANG module in the "YANG Module Names" subregistry [RFC6020] within the "YANG Parameters" registry.¶
Name: ietf-network-vpn-pm
Namespace: urn:ietf:params:xml:ns:yang:ietf-network-vpn-pm
Maintained by IANA: N
Prefix: nvp
Reference: RFC XXXX (RFC Ed.: replace XXXX with actual
RFC number and remove this note.)
¶
Thanks to Joe Clarke, Adrian Farrel, Tom Petch, Greg Mirsky, Roque Gagliano, Erez Segev, and Dhruv Dhody for reviewing and providing important input to this document.¶
The following authors contributed significantly to this document:¶
Michale Wang Huawei Email:wangzitao@huawei.com Roni Even Huawei Email: ron.even.tlv@gmail.com Change Liu China Unicom Email: liuc131@chinaunicom.cn Honglei Xu China Telecom Email: xuhl6@chinatelecom.cn¶
The example shown in Figure 8 illustrates how a client subscribes to the performance monitoring information between nodes ('node-id') A and B in the L3 network topology. The performance monitoring parameter that the client is interested in is end-to-end loss.¶
POST /restconf/operations
/ietf-subscribed-notifications:establish-subscription
{
"ietf-subscribed-notifications:input": {
"stream-subtree-filter": {
"ietf-network:networks": {
"network": {
"network-id": "foo:vpn1",
"ietf-network-vpn-pm:service": {
"service-type": "ietf-vpn-common:l3vpn"
},
"node": [
{
"node-id": "A",
"ietf-network-vpn-pm:node-type": "PE",
"termination-point": [
{
"tp-id": "1-0-1"
}
]
},
{
"node-id": "B",
"ietf-network-vpn-pm:node-type": "PE",
"termination-point": [
{
"tp-id": "2-0-1"
}
]
}
],
"ietf-network-topology:link": [
{
"link-id": "A-B",
"source": {
"source-node": "A"
},
"destination": {
"dest-node": "B"
},
"ietf-network-vpn-pm:perf-mon": {
"pm": [
{
"pm-type": "pm-type-vpn-tunnel",
"pm-attributes": {
"one-way-pm-statistics": {
"loss-statistics": {
"packet-loss-count": {}
}
}
}
}
],
"vpn-pm-type": {
"vpn-tunnel": {
"vpn-tunnel-type": "ietf-vpn-common:gre"
}
}
}
}
]
}
},
"ietf-yang-push:periodic": {
"ietf-yang-push:period": "500"
}
}
}
}
This example, depicted in Figure 9, illustrates an VPN PM instance example in which a client uses RESTCONF [RFC8040] to fetch the performance data of the link and TP belonged to "VPN1".¶
{
"ietf-network:networks": {
"network": {
"network-id": "foo:vpn1",
"node": [
{
"node-id": "A",
"ietf-network-vpn-pm:node-type": "PE",
"termination-point": [
{
"tp-id": "1-0-1",
"ietf-network-vpn-pm:pm-statistics": {
"inbound-octets": "100",
"outbound-octets": "150"
}
}
]
},
{
"node-id": "B",
"ietf-network-vpn-pm:node-type": "PE",
"termination-point": [
{
"tp-id": "2-0-1",
"ietf-network-vpn-pm:pm-statistics": {
"inbound-octets": "150",
"outbound-octets": "100"
}
}
]
}
],
"ietf-network-topology:link": [
{
"link-id": "A-B",
"source": {
"source-node": "A"
},
"destination": {
"dest-node": "B"
},
"ietf-network-pm:perf-mon": {
"pm": [
{
"pm-type": "pm-type-vpn-tunnel",
"pm-attributes": {
"one-way-pm-statistics": {
"loss-statistics": {
"packet-loss-count": "120"
}
}
}
}
],
"vpn-pm-type": {
"vpn-tunnel": {
"vpn-tunnel-type": "ietf-vpn-common:gre"
}
}
}
}
]
}
}
}
This is an example of percentile measurement data that could be returned for a link foo:vpn1-link1 between vpn-node1 and vpn-node3.¶
{
"ietf-network-topology:link": [
{
"link-id": "foo:vpn1-link1",
"source": {
"source-node": "vpn-node1"
},
"destination": {
"dest-node": "vpn-node3"
},
"ietf-network-vpn-pm:perf-mon": {
"low-percentile": "20.00",
"intermediate-percentile": "50.00",
"high-percentile": "90.00",
"pm": [
{
"pm-type": "pm-type-vpn-inter-access",
"pm-attributes": {
"one-way-pm-statistics": {
"delay-statistics": {
"unit-value": "lime:milliseconds",
"min-delay-value": "43",
"max-delay-value": "99",
"low-delay-percentile": "64",
"intermediate-delay-percentile": "77",
"high-delay-percentile": "98"
}
}
}
}
],
"vpn-pm-type": {
"inter-vpn-access-interface": {
"inter-vpn-access-interface": [null]
}
}
}
}
]
}
¶