| Internet-Draft | Network and VPN Service PM YANG | April 2022 |
| Wu, et al. | Expires 27 October 2022 | [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 networks and VPN services that can be used to monitor and manage network performance on the topology at higher layer or the service topology between VPN sites.¶
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 October 2022.¶
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 [RFC6020] 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 underlay tunnels 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 display the performance monitoring statistics at the network and service layers. 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 layering model architecture described in [RFC8309], the network and VPN service performance monitoring (PM) model can be used to expose a set of performance information to the above layer. Such information can be used by an orchestrator to subscribe to performance data. The network controller will then notify the orchestrator about corresponding parameter changes.¶
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], 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 [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.¶
In addition, the amount of performance data collected from the devices can be huge. To avoid receiving a large amount of operational data of VPN instances, VPN interfaces, or tunnels, the network controller can specifically subscribe to metric-specific data using the tagging methods defined in [I-D.ietf-netmod-node-tags].¶
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, various notifications can be specified to obtain more complete data. A periodic notification [RFC8641] can be specified to obtain real-time performance data, a replay notification defined in [RFC5277] or [RFC8639] can be specified to obtain historical data, or 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 assurance 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.¶
The performance monitoring data augments the service topology 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 can also provide the performance status of the underlay network and VPN services. For example, network PM can provide link PM statistics and port statistics. VPN PM can provide statistics on VPN access interfaces, the number of current VRF routes or L2VPN MAC entry of VPN nodes, and performance statistics on the logical point-to-point link between source and destination VPN nodes or between source and destination VPN access interfaces. Figure 4 illustrates an example of VPN PM and the difference between two VPN PM measurement methods. One is the VPN tunnel PM and the other is inter-VPN-access interface PM.¶
+-----------------------------------------------------+
| |
| 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
For network performance monitoring, the container of "networks" in [RFC8345] does not need to be extended.¶
For VPN service performance monitoring, the container "service-type" is defined to indicate the VPN type, e.g., L3VPN or Virtual Private LAN Service (VPLS). The values are taken from [RFC9181]. When a network topology instance contains the L3VPN or other L2VPN network type, it represents a VPN instance that can perform performance monitoring.¶
The tree in Figure 5 is a part of ietf-network-vpn-pm tree. It defines the following set of network level attributes:¶
module: ietf-network-vpn-pm
augment /nw:networks/nw:network/nw:network-types:
+--rw service-type!
+--rw service-type? identityref
augment /nw:networks/nw:network:
+--rw vpn-pm-attributes
+--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, a container of "pm-attributes" is augmented to the list of "node" that are defined in [RFC8345]. The container includes the following attributes:¶
For VPN service performance monitoring, the model defines one attribute:¶
augment /nw:networks/nw:network/nw:node:
+--rw pm-attributes
+--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
+--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 pm-attributes
+--rw low-percentile? percentile
+--rw intermediate-percentile? percentile
+--rw high-percentile? percentile
+--rw measurement-interval? uint32
+--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)?
+--:(inter-vpn-access-interface)
| +--rw inter-vpn-access-interface? empty
+--:(underlay-tunnel)
+--ro vpn-underlay-transport-type? identityref
augment /nw:networks/nw:network/nw:node/nt:termination-point:
+--ro pm-statistics
+--ro reference-time? yang:date-and-time
+--ro inbound-octets? yang:counter64
+--ro inbound-unicast? yang:counter64
+--ro inbound-nunicast? 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-nunicast? 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 reference-time? yang:date-and-time
+--ro inbound-octets? yang:counter64
+--ro inbound-unicast? yang:counter64
+--ro inbound-nunicast? 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-nunicast? 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@2022-04-25.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 2022-04-25 {
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.";
reference
"RFC 4026: Provider Provisioned
Virtual Private Network (VPN) Terminology";
}
identity p {
base node-type;
description
"Provider router node type.";
reference
"RFC 4026: Provider Provisioned
Virtual Private Network (VPN) Terminology";
}
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-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";
}
typedef percentage {
type decimal64 {
fraction-digits 5;
range "0..100";
}
description
"Percentage.";
}
typedef percentile {
type decimal64 {
fraction-digits 2;
range "0..100";
}
description
"The percentile is a value between 0 and 100,
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.";
}
leaf total-active-routes {
type uint32;
description
"Indicates total active IPv4 routes for the VPN.";
}
description
"IPv4-specific parameters.";
}
container ipv6-num {
leaf maximum-routes {
type uint32;
description
"Indicates the maximum number of IPv6 routes
for the VPN.";
}
leaf total-active-routes {
type uint32;
description
"Indicates total active IPv6 routes for the VPN.";
}
description
"IPv6-specific parameters.";
}
container mac-num {
leaf mac-num-limit {
type uint32;
description
"Maximum number of MAC addresses.";
}
leaf total-active-mac-num {
type uint32;
description
"Total active MAC entries for the VPN.";
}
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 received packet drops count.";
}
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 s, ms, ns, etc.";
}
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 s, ms, ns, etc.";
}
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 reference-time {
type yang:date-and-time;
config false;
description
"Indicates the time when the statistics are collected.";
}
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-nunicast {
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-nunicast {
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-type {
presence "Indicates network service topology.";
leaf service-type {
type identityref {
base vpn-common:service-type;
}
description
"The presence identifies the network service type,
e.g., L3VPN, VPLS, etc.";
}
description
"Container for VPN service type.";
}
}
augment "/nw:networks/nw:network" {
when 'nw:network-types/nvp:service-type' {
description
"Augments only for VPN Network topology.";
}
description
"Augments the network with service topology attributes";
container vpn-pm-attributes {
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.";
}
description
"Container for VPN topology attributes.";
}
}
augment "/nw:networks/nw:network/nw:node" {
description
"Augments the network node with other general attributes.";
container pm-attributes {
leaf node-type {
type identityref {
base node-type;
}
description
"Node type, e.g., PE, P, ASBR.";
}
description
"Container for node attributes.";
uses entry-summary;
}
}
augment "/nw:networks/nw:network/nw:node/pm-attributes" {
when '../../nw:network-types/nvp:service-type' {
description
"Augments only for VPN node attributes.";
}
description
"Augments the network node with VPN specific attributes.";
leaf role {
type identityref {
base vpn-common:role;
}
default "vpn-common:any-to-any-role";
description
"Role of the node in the VPN.";
}
}
augment "/nw:networks/nw:network/nt:link" {
description
"Augments the network topology link with performance
monitoring attributes.";
container pm-attributes {
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.";
}
leaf start-time {
type yang:date-and-time;
config false;
description
"The time that the current measurement started.";
}
leaf end-time {
type yang:date-and-time;
config false;
description
"The time that the current measurement 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/pm-attributes" {
when '../../nw:network-types/nvp:service-type' {
description
"Augments only for VPN Network topology.";
}
description
"Augments the network topology link with VPN service
performance monitoring attributes.";
choice vpn-pm-type {
description
"The VPN PM type of this logical point-to-point
unidirectional VPN link.";
case inter-vpn-access-interface {
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.";
}
}
case underlay-tunnel {
leaf vpn-underlay-transport-type {
type identityref {
base vpn-common:protocol-type;
}
config false;
description
"The leaf indicates the underlay transport type of
a VPN service, e.g., GRE, LDP, 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-type' {
description
"Augments only for VPN Network topology.";
}
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
"References to an identifier for the VPN network
access, e.g. L3VPN or VPLS.";
}
uses tp-svc-telemetry;
}
}
}
<CODE ENDS>¶
The YANG modules defined in this document MAY be accessed via the RESTCONF protocol [RFC8040] or NETCONF protocol [RFC6241]. The lowest RESTCONF or NETCONF layer requires that the transport-layer protocol provides both data integrity and confidentiality, see Section 2 in [RFC8040] and [RFC6241]. 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.¶
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 with the write operation that can be exploited to impact the network monitoring:¶
Some of the readable data nodes in this YANG module may be considered sensitive or vulnerable in some network environments. The nodes reveals the quality of a service that is operated by an operator. 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 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: xuhl.bri@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:l3-network",
"ietf-network-vpn-pm:service-type":{
"ietf-vpn-common:l3vpn":{}
},
"node":[
{
"node-id":"A",
"ietf-network-vpn-pm:pm-attributes":{
"node-type":"PE"
},
"termination-point":{
"tp-id":"1-0-1"
}
},
{
"node-id":"B",
"ietf-network-vpn-pm:pm-attributes":{
"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:pm-attributes":{
"one-way-pm-statistics":{
"loss-statistics":{
"packet-loss-count":{}
}
},
"vpn-underlay-transport-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:pm-attributes": {
"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:pm-attributes": {
"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:pm-attributes": {
"one-way-pm-statistics": {
"loss-statistics": { "packet-loss-count": "120" }
},
"vpn-underlay-transport-type": "ietf-vpn-common:gre"
}
}
}
}
}
The following shows an example of a percentile measurement for a VPN link.¶
{
"ietf-network-topology:link": [
{
"link-id": "foo:vpn1-link1",
"source": {
"source-node": "vpn-node1"
},
"destination": {
"dest-node": "vpn-node3"
},
"ietf-network-vpn-pm:pm-attributes": {
"low-percentile": "20.00",
"intermediate-percentile": "50.00",
"high-percentile": "90.00",
"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"
}
},
"inter-vpn-access-interface": [null]
}
}
]
}¶