Internet DRAFT - draft-liu-yang-abstract-te-topo
draft-liu-yang-abstract-te-topo
Network Working Group Xufeng Liu
Internet Draft Ericsson
Intended status: Standards Track Vishnu Pavan Beeram
Juniper Networks
Alexander Clemm
Cisco
Igor Bryskin
Aihua Guo
ADVA Optical Networking
Expires: April 27, 2015 October 27, 2014
A Yang Data Model for Abstract TE Topologies
draft-liu-yang-abstract-te-topo-00
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carefully, as they describe your rights and restrictions with
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Abstract
This document discusses a YANG data model for Abstract TE
Topologies.
Conventions used in this document
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in RFC-2119 [RFC2119].
Table of Contents
1. Introduction...................................................2
2. Abstract TE Topologies.........................................2
2.1. Motivation................................................2
2.2. Static vs Fluid Abstract TE Topologies....................4
3. Tree Structure.................................................4
4. Abstract TE Topology - Yang Module............................10
5. Security Considerations.......................................18
6. IANA Considerations...........................................18
7. References....................................................18
7.1. Normative References.....................................18
7.2. Informative References...................................19
8. Acknowledgments...............................................20
1. Introduction
This document defines a YANG [RFC6020] [RFC6021] module for
representing and manipulating Abstract TE topologies.
2. Abstract TE Topologies
2.1. Motivation
Clients of a transport network normally have no visibility into the
network's actual Traffic-Engineering (TE) topology and resource
availability information. There are numerous reasons for this, such
as:
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Security considerations: network operators are usually reluctant to
expose the network's actual topology to its clients;
Transport network, generally speaking, is comprised of network
elements that belong to a different layer network that the client
devices. Also the internal network routing and traffic engineering
advertisements usually contain proprietary information, which the
clients cannot interpret, but discarding of which would lead to
incorrect assumptions and decisions. This means that the clients
cannot use actual network topology and traffic engineering
information even if said information is available;
Scalability considerations: clients do not want to know any
transport network information that is not related to the services
provided to the clients.
On the other hand the clients need to influence to certain extent on
the way the services provided to them are routed across the
transport network: some services, for example, need to be as
disjoint from each other as possible because they support various
network failure protection schemes provisioned in the client layer
network; others, on the contrary, need to be co-routed and share
fate as much as possible; placement of some services needs to be
optimized based on the lowest cost criteria, while other service
paths need to be selected to have best optical signal quality or
delay characteristics, and so forth.
Different approaches exist to allow for the clients to affect the
placement of provided for them services on the transport network
under conditions of no visibility into the actual transport network
topology and resource availability information. For example, [GMPL-
UNI] architecture allows for clients signaling their service routing
policies/preferences within the service setup and modify messages
and mandates the network path computers to honor said
policies/preferences during the service path selection. There are
also control plane based (e.g. [GMPLS-ENNI]) and SDN architectures
that require the network to expose abstract TE topologies. Such
topologies are decoupled from the network actual topologies and are
provided on per client group/VPN/tenant basis. The abstract TE
topologies are supposed to be fully comprehensible by the clients
and contain sufficient information for the client path computers to
select service paths according to the client policies. The service
paths so selected in terms of abstract TE topology elements could be
signaled or otherwise conveyed within service setup/modify requests
to the transport network system responsible for the service
provisioning.
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2.2. Static vs Fluid Abstract TE Topologies
One problem with the abstract TE topologies exposed to the clients
is their static nature. The abstract TE topologies are usually
manually configured based on the transport network operator
policies. This entails tedious error-prone configuration. This also
does not allow for the clients to have a say as to how the abstract
TE topologies exposed to them should look like, which elements
(nodes, links) it should contain, what the parameters (e.g. link
bandwidth, SRLGs, etc.) are, and so forth. The problem becomes
especially profound in case the clients requirements with respect to
the abstract TE topologies change over time and/or depend on
particular week, day, time of the day, etc. It is highly desirable
to have a data model understood and supported by the transport
network and all its potential clients that would allow for the
clients to dynamically (re-)configure the abstract TE topologies
exposed to them in real time. This document introduces a data model
written in YANG, that allows for the clients using NETCONF and/or
RESTCONF protocols to (re-)configure abstract topologies, retrieve
their data state and, thus, to automate the abstract topology
manipulation.
3. Tree Structure
The structure of the groupings in this module are depicted below.
Brackets enclose list keys, "rw" means configuration data, "ro"
means operational state data, and "?" designates optional nodes.
module: abstract-te-topology
augment /nt:network-topology/nt:topology/nt:topology-types/l3t:l3-
unicast-igp-topology:
+--rw abstract-te-topology!
augment /nt:network-topology/nt:topology/nt:node/nt:termination-
point/l3t:igp-termination-point-attributes:
+--rw abstract-tp-attributes
+--rw topo-ref? leafref
+--rw node-ref? leafref
augment /nt:network-topology/nt:topology/nt:node/l3t:igp-node-
attributes:
+--rw abstract-node-attributes
+--rw schedules* [schedule-id]
| +--rw schedule-id uint32
| +--rw start? yang:date-and-time
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| +--rw schedule-duration? string
| +--rw repeat-interval? string
+--rw is-abstract? boolean
+--rw underlay-topology? leafref
+--rw connectivity-matrix* [id]
| +--rw id uint32
| +--rw from-tp
| | +--rw topo-ref? leafref
| | +--rw node-ref? leafref
| | +--rw tp-ref? leafref
| +--rw to-tp
| | +--rw topo-ref? leafref
| | +--rw node-ref? leafref
| | +--rw tp-ref? leafref
| +--rw is-allowed? boolean
| +--rw information-source? enumeration
| +--rw credibility-preference? uint16
+--rw ted
+--rw te-router-id-ipv4? inet:ipv4-address
+--rw te-router-id-ipv6? inet:ipv6-address
+--rw ipv4-local-address* [ipv4-prefix]
| +--rw ipv4-prefix inet:ipv4-prefix
+--rw ipv6-local-address* [ipv6-prefix]
| +--rw ipv6-prefix inet:ipv6-prefix
| +--rw prefix-option? uint8
+--rw pcc-capabilities? pcc-capabilities
augment /nt:network-topology/nt:topology/nt:link/l3t:igp-link-
attributes:
+--rw abstract-link-attributes
+--rw schedules* [schedule-id]
| +--rw schedule-id uint32
| +--rw start? yang:date-and-time
| +--rw schedule-duration? string
| +--rw repeat-interval? string
+--rw is-abstract? boolean
+--rw server-layer!
| +--rw dynamic? boolean
| +--rw committed? boolean
+--rw server-path
| +--rw path-element* [path-element-id]
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| +--rw path-element-id uint32
| +--rw loose? boolean
| +--rw (element-type)?
| +--:(numbered-link)
| | +--rw link-ip-address? inet:ip-address
| +--:(unnumbered-link)
| | +--rw link-node-id? uint32
| | +--rw link-id? uint32
| +--:(node)
| | +--rw node-id? uint32
| +--:(label)
| +--rw label? uint32
+--rw server-backup-path
| +--rw path-element* [path-element-id]
| +--rw path-element-id uint32
| +--rw loose? boolean
| +--rw (element-type)?
| +--:(numbered-link)
| | +--rw link-ip-address? inet:ip-address
| +--:(unnumbered-link)
| | +--rw link-node-id? uint32
| | +--rw link-id? uint32
| +--:(node)
| | +--rw node-id? uint32
| +--:(label)
| +--rw label? uint32
+--rw server-protection-type? uint16
+--rw server-trail-src
| +--rw topo-ref? leafref
| +--rw node-ref? leafref
| +--rw tp-ref? leafref
+--rw server-trail-des
| +--rw topo-ref? leafref
| +--rw node-ref? leafref
| +--rw tp-ref? leafref
+--rw ted
+--rw link-index? uint64
+--rw information-source? enumeration
+--rw credibility-preference? uint16
+--rw admin-status? enumeration
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+--rw oper-status? enumeration
+--rw area-id? binary
+--rw color? uint32
+--rw max-link-bandwidth? decimal64
+--rw max-resv-link-bandwidth? decimal64
+--rw unreserved-bandwidth* [priority]
| +--rw priority uint8
| +--rw bandwidth? decimal64
+--rw te-default-metric? uint32
+--rw link-protection-type? enumeration
+--rw interface-switching-capabilities* [switching-
capability]
| +--rw switching-capability ted:switching-capabilities
| +--rw encoding? ted:encoding-type
| +--rw max-lsp-bandwidth* [priority]
| | +--rw priority uint8
| | +--rw bandwidth? decimal64
| +--rw packet-switch-capable
| | +--rw minimum-lsp-bandwidth? decimal64
| | +--rw interface-mtu? uint16
| +--rw time-division-multiplex-capable
| +--rw minimum-lsp-bandwidth? decimal64
| +--rw indication? enumeration
+--rw srlg
+--rw srlg-values* [srlg-value]
+--rw srlg-value uint32
augment /l3t:igp-node-event:
+--ro abstract-te-topology!
+--ro abstract-node-attributes
+--ro schedules* [schedule-id]
| +--ro schedule-id uint32
| +--ro start? yang:date-and-time
| +--ro schedule-duration? string
| +--ro repeat-interval? string
+--ro is-abstract? boolean
+--ro underlay-topology? leafref
+--ro connectivity-matrix* [id]
| +--ro id uint32
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| +--ro from-tp
| | +--ro topo-ref? leafref
| | +--ro node-ref? leafref
| | +--ro tp-ref? leafref
| +--ro to-tp
| | +--ro topo-ref? leafref
| | +--ro node-ref? leafref
| | +--ro tp-ref? leafref
| +--ro is-allowed? boolean
| +--ro information-source? enumeration
| +--ro credibility-preference? uint16
+--ro ted
+--ro te-router-id-ipv4? inet:ipv4-address
+--ro te-router-id-ipv6? inet:ipv6-address
+--ro ipv4-local-address* [ipv4-prefix]
| +--ro ipv4-prefix inet:ipv4-prefix
+--ro ipv6-local-address* [ipv6-prefix]
| +--ro ipv6-prefix inet:ipv6-prefix
| +--ro prefix-option? uint8
+--ro pcc-capabilities? pcc-capabilities
augment /l3t:igp-link-event:
+--ro abstract-te-topology!
+--ro abstract-link-attributes
+--ro schedules* [schedule-id]
| +--ro schedule-id uint32
| +--ro start? yang:date-and-time
| +--ro schedule-duration? string
| +--ro repeat-interval? string
+--ro is-abstract? boolean
+--ro server-layer!
| +--ro dynamic? boolean
| +--ro committed? boolean
+--ro server-path
| +--ro path-element* [path-element-id]
| +--ro path-element-id uint32
| +--ro loose? boolean
| +--ro (element-type)?
| +--:(numbered-link)
| | +--ro link-ip-address? inet:ip-address
| +--:(unnumbered-link)
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| | +--ro link-node-id? uint32
| | +--ro link-id? uint32
| +--:(node)
| | +--ro node-id? uint32
| +--:(label)
| +--ro label? uint32
+--ro server-backup-path
| +--ro path-element* [path-element-id]
| +--ro path-element-id uint32
| +--ro loose? boolean
| +--ro (element-type)?
| +--:(numbered-link)
| | +--ro link-ip-address? inet:ip-address
| +--:(unnumbered-link)
| | +--ro link-node-id? uint32
| | +--ro link-id? uint32
| +--:(node)
| | +--ro node-id? uint32
| +--:(label)
| +--ro label? uint32
+--ro server-protection-type? uint16
+--ro server-trail-src
| +--ro topo-ref? leafref
| +--ro node-ref? leafref
| +--ro tp-ref? leafref
+--ro server-trail-des
| +--ro topo-ref? leafref
| +--ro node-ref? leafref
| +--ro tp-ref? leafref
+--ro ted
+--ro link-index? uint64
+--ro information-source? enumeration
+--ro credibility-preference? uint16
+--ro admin-status? enumeration
+--ro oper-status? enumeration
+--ro area-id? binary
+--ro color? uint32
+--ro max-link-bandwidth? decimal64
+--ro max-resv-link-bandwidth? decimal64
+--ro unreserved-bandwidth* [priority]
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| +--ro priority uint8
| +--ro bandwidth? decimal64
+--ro te-default-metric? uint32
+--ro link-protection-type? enumeration
+--ro interface-switching-capabilities* [switching-
capability]
| +--ro switching-capability ted:switching-capabilities
| +--ro encoding? ted:encoding-type
| +--ro max-lsp-bandwidth* [priority]
| | +--ro priority uint8
| | +--ro bandwidth? decimal64
| +--ro packet-switch-capable
| | +--ro minimum-lsp-bandwidth? decimal64
| | +--ro interface-mtu? uint16
| +--ro time-division-multiplex-capable
| +--ro minimum-lsp-bandwidth? decimal64
| +--ro indication? enumeration
+--ro srlg
+--ro srlg-values* [srlg-value]
+--ro srlg-value uint32
4. Abstract TE Topology - Yang Module
module abstract-te-topology {
yang-version 1;
namespace "urn:ietf:params:xml:ns:yang:abstract-te-topology";
// replace with IANA namespace when assigned
prefix "abst";
import ietf-yang-types {
prefix "yang";
}
import ietf-inet-types {
prefix "inet";
}
import network-topology {
prefix "nt";
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}
import l3-unicast-igp-topology {
prefix "l3t";
}
import ted {
prefix "ted";
}
organization "TBD";
contact "TBD";
description "Abstract topology model";
revision "2014-10-27" {
description "Initial revision";
reference "TBD";
}
grouping abstract-te-topology-type {
description
"Identifies the abstract topology type.";
container abstract-te-topology {
presence "indicates abstract topology";
description
"Its presence identifies the abstract topology type.";
}
}
augment "/nt:network-topology/nt:topology/"
+ "nt:topology-types/l3t:l3-unicast-igp-topology" {
description
"Defines the abstract topology type.";
uses abstract-te-topology-type;
}
grouping te-path-element {
description
"A group of attributes defining an element in a TE path
such as TE node, TE link, TE aotomic resource or label.";
leaf loose {
type boolean;
description "true if the element is loose.";
}
choice element-type {
description "Attributes for various element types.";
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case numbered-link {
leaf link-ip-address {
type inet:ip-address;
description "IPv4 or IPv6 address.";
}
}
case unnumbered-link {
leaf link-node-id {
type uint32;
description
"Node ID of the node where the link end point resides.";
}
leaf link-id {
type uint32;
description "Identifies the link end point.";
}
}
case node {
leaf node-id {
type uint32;
description "Identifies the node.";
}
}
case label {
leaf label {
type uint32;
description "Identifies atomic TE resource or label.";
}
}
}
} // te-path-element
grouping config-schedule-attributes {
description
"A list of schedules defining when a particular
configuration takes effect.";
list schedules {
key "schedule-id";
description "A list of schedule elements.";
leaf schedule-id {
type uint32;
description "Identifies the schedule element.";
}
leaf start {
type yang:date-and-time;
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description "Start time.";
}
leaf schedule-duration {
type string {
pattern
'P(\d+Y)?(\d+M)?(\d+W)?(\d+D)?T(\d+H)?(\d+M)?(\d+S)?';
}
description "Schedule duration in ISO 8601 format.";
}
leaf repeat-interval {
type string {
pattern
'R\d*/P(\d+Y)?(\d+M)?(\d+W)?(\d+D)?T(\d+H)?(\d+M)?'
+ '(\d+S)?';
}
description "Repeat interval in ISO 8601 format.";
}
}
}
grouping abstract-node-attributes {
description "Node attributes in an abstract topology.";
container abstract-node-attributes {
description "Node attributes in an abstract topology.";
uses config-schedule-attributes;
leaf is-abstract {
type boolean;
description
"true if the node is abstract, false when the node is
actual.";
}
leaf underlay-topology {
type leafref {
path "/nt:network-topology/nt:topology/nt:topology-id";
}
description
"When an abstract node encapsulates a topology,
this reference points to said topology.";
}
list connectivity-matrix {
key "id";
description
"Represents node's switching limitations, i.e. limitations
in interconnecting network termination points (NTPs)
across the node.";
leaf id {
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type uint32;
description "Identifies the connectivity-matrix entry.";
}
container from-tp {
uses l3t:tp-ref;
description
"Reference to source NTP.";
}
container to-tp {
uses l3t:tp-ref;
description
"Reference to destination NTP.";
}
leaf is-allowed {
type boolean;
description
"true - switching is allowed,
false - switching is disallowed.";
}
leaf information-source {
type enumeration {
enum "unknown" {
description "The source is unknown";
}
enum "locally-configured" {
description "Configured TE link";
}
enum "ospfv2" {
description "OSPFv2";
}
enum "ospfv3" {
description "OSPFv3";
}
enum "isis" {
description "ISIS";
}
enum "other" {
description "Other source";
}
}
description
"Indicates the source of the information.";
}
leaf credibility-preference {
type uint16;
description
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"The preference value to calculate the traffic
engineering database credibility value used for
tie-break selection between different
information-source values.
Higher value is more preferable.";
}
}
container ted {
description "Includes TE node attributes.";
uses ted:ted-node-attributes;
}
}
} // abstract-node-attributes
grouping abstract-tp-attributes {
description
"Termination point attributes in an abstract topology.";
container abstract-tp-attributes {
description
"Termination point attributes in an abstract topology.";
uses l3t:node-ref;
}
} // abstract-tp-attributes
grouping abstract-link-attributes {
description
"Link attributes in an abstract topology.";
container abstract-link-attributes {
description "Link attributes in an abstract topology.";
uses config-schedule-attributes;
leaf is-abstract {
type boolean;
description "true if the link is abstract.";
}
container server-layer {
presence
"Indicates the server layer exists for this link.";
description "State of the server layer of this link.";
leaf dynamic {
type boolean;
description
"true if the server layer is dynamically created.";
}
leaf committed {
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type boolean;
description
"true if the server layer is committed.";
}
}
container server-path {
description
"The service path on the server layer topology that
supports this link.";
list path-element {
key "path-element-id";
description
"A list of path elements describing the service path";
leaf path-element-id {
type uint32;
description "To identify the element in a path.";
}
uses te-path-element;
}
} // server-path
container server-backup-path {
description
"The backup service path on the server layer topology that
supports this link.";
list path-element {
key "path-element-id";
description
"A list of path elements describing the backup service
path";
leaf path-element-id {
type uint32;
description "To identify the element in a path.";
}
uses te-path-element;
}
} // server-backup-path
leaf server-protection-type {
type uint16;
description
"Server layer protection type desired for this link";
}
container server-trail-src {
uses l3t:tp-ref;
description
"Source termination point of the server layer trail.";
}
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container server-trail-des {
uses l3t:tp-ref;
description
"Destination termination point of the server layer
trail.";
}
container ted {
description "Includes TE link attributes.";
uses ted:ted-link-attributes;
}
}
} // abstract-link-attributes
augment "/nt:network-topology/nt:topology/nt:node/"
+ "nt:termination-point/"
+ "l3t:igp-termination-point-attributes" {
when "../../../topology-types/abstract-te-topology" {
description
"The augment is valid only for abstract topology.";
}
description "Augments attributes on a termination point.";
uses abstract-tp-attributes;
}
augment "/nt:network-topology/nt:topology/nt:node/"
+ "l3t:igp-node-attributes" {
when "../../topology-types/abstract-te-topology" {
description
"The augment is valid only for abstract topology.";
}
description "Augments attributes on a node.";
uses abstract-node-attributes;
}
augment "/nt:network-topology/nt:topology/nt:link/"
+ "l3t:igp-link-attributes" {
when "../../topology-types/abstract-te-topology" {
description
"The augment is valid only for abstract topology.";
}
description "Augments attributes on a link.";
uses abstract-link-attributes;
}
augment "/l3t:igp-node-event" {
description "Augments node event.";
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uses abstract-te-topology-type;
uses abst:abstract-node-attributes;
}
augment "/l3t:igp-link-event" {
description "Augments link event.";
uses abstract-te-topology-type;
uses abst:abstract-link-attributes;
}
}
5. Security Considerations
The protocol used for sending the TE topology data MUST support
authentication and SHOULD support encryption. The data-model by
itself does not create any security implications.
6. IANA Considerations
TBD
7. References
7.1. Normative References
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC6020] Bjorklund, M., "YANG - A Data Modeling Language for the
Network Configuration Protocol (NETCONF)", RFC 6020,
October 2010.
[RFC6021] Schoenwaelder, J., "Common YANG Data Types", RFC 6021,
October 2010.
[RFC6241] Enns, R., Bjorklund, M., Schoenwaelder, J., and A.
Bierman, "Network Configuration Protocol (NETCONF)", RFC
6241, June 2011.
[RFC2234] Crocker, D. and Overell, P.(Editors), "Augmented BNF for
Syntax Specifications: ABNF", RFC 2234, Internet Mail
Consortium and Demon Internet Ltd., November 1997.
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[RFC3471] Berger, L., "Generalized Multi-Protocol Label Switching
(GMPLS) Signaling Functional Description", RFC 3471,
January 2003.
[RFC3811] Nadeau, T. and J. Cucchiara, "Definitions of Textual
Conventions (TCs) for Multiprotocol Label Switching (MPLS)
Management", RFC 3811, June 2004.
[RFC3812] Srinivasan, C., Viswanathan, A., and T. Nadeau,
"Multiprotocol Label Switching (MPLS) Traffic Engineering
(TE) Management Information Base (MIB)", RFC 3812, June
2004.
[RFC3813] Srinivasan, C., Viswanathan, A., and T. Nadeau,
"Multiprotocol Label Switching (MPLS) Label Switching
Router (LSR) Management Information Base (MIB)", RFC 3813,
June 2004.
[RFC4208] Swallow, G., Drake, J., Ishimatsu, H., and Rekhter, Y.,
"Generalized Multiprotocol Label Switching (GMPLS) User-
Network Interface (UNI): Resource ReserVation Protocol-
Traffic Engineering (RSVP-TE) Support for the Overlay
Model", RFC4208, October 2005.
[RFC4220] Dubuc, M., Nadeau, T., and Lang, J., " Traffic Engineering
Link Management Information Base", RFC 4220, November
2005.
[RFC4801] Nadeau, T., Ed. and A. Farrel, Ed., "Definitions of
Textual Conventions for Multiprotocol Label Switching
(MPLS) Management", RFC 4801, February 2007.
[RFC4802] Nadeau, T., Ed. and A. Farrel, Ed., "Generalized
Multiprotocol Label Switching (GMPLS) Traffic Engineering
Management Information Base", RFC 4802, February 2007.
7.2. Informative References
[G.8080] ITU-T Rec. G.8080/Y.1304, "Architecture for the
Automatically Switched Optical Network (ASON)," November
2001 (and Revision, January 2003). For information on the
availability of this document, please see
http://www.itu.int.
[I-D.clemm-i2rs-yang-network-topo]
Liu, et al Expires April 27, 2015 [Page 19]
Internet-Draft YANG - Abstract TE Topologies October 2014
A. Clemm, "A YANG Data Model for Network Topologies",
draft-clemm-i2rs-yang-network-topo-01.
[I-D.liu-yang-ted]
Xufeng Liu, "A Yang module for TED", draft-liu-yang-ted-
00.
[I-D.clemm-i2rs-yang-l3-topo]
A. Clemm,"A YANG Data Model for Layer 3 Topologies",
draft-clemm-i2rs-yang-l3-topo-00.
8. Acknowledgments
TBD
Authors' Addresses
Xufeng Liu
Ericsson
Email: Xufeng.liu@ericsson.com
Vishnu Pavan Beeram
Juniper Networks
Email: vbeeram@juniper.net
Alexander Clemm
Cisco
Email: alex@cisco.com
Igor Bryskin
ADVA Optical Networking
Email: ibryskin@advaoptical.com
Aihua Guo
ADVA Optical Networking
Email: aguo@advaoptical.com
Contributors
Gert Grammel
Juniper Networks
Email: ggrammel@juniper.net
Liu, et al Expires April 27, 2015 [Page 20]
Internet-Draft YANG - Abstract TE Topologies October 2014
