Yang Data Model for TE Topologies

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Github: https://github.com/ietf-mpls-yang/te/blob/master/ietf-te-topology.yang

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Xufeng Liu (Ericsson)

Vishnu Pavan Beeram (Juniper Networks)

Igor Bryskin (ADVA Optical Networking)

Tarek Saad (Cisco)

Himanshu Shah (Ciena)

Oscar Gonzalez De Dios (Telefonica)

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TE Topology – Yang Model Yang Data Model for representing and manipulating TE

Topologies: Technology agnostic TE Topology building blocks

Generic Node/Link attributes Information Sources

Model captures overlay and underlay relationship for nodes and links

Allows Hierarchical TE Topology views Time scheduling parameters

Can be specified for the topology as a whole or each individual topological element

Abstract TE Topologies Model facilitates the notion of “TE Topology as a Service”

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TE Topology Building Blocks Generic TE Link Attributes

Bandwidth, Admin groups, SRLGs, Switching Capabilities, TE metric extensions etc.

Generic TE Node Attributes Generic Connectivity Matrix

Information Sources Each TE topological element can have multiple TE

information sources (OSPF-TE, ISIS-TE, BGP-LS, User-Configured, Other)

Each information source is associated with a credibility preference.

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Overlay/Underlay Relationship Model captures overlay and underlay relationship

for TE nodes/links. In hierarchical TE Topologies, model allows vertical

traversal of topological elements. Facilitates Hierarchical TE Topology Views

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Hierarchical TE Topology Views

E F

B C

A D

P Q

M NE’ F’

W Y

P’ Q’

V Z

RO

X

Topology -Blue

Topology -Red

Topology -Green

TE-Link E-F in Topology-Blue is catered to by underlay TE-path {E’-M-P-Q-N-F’} in Topology-Red

TE-Link P-Q in Topology-Red is catered to by underlay TE-path {P’-X-Q’} in Topology-Green

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Time Scheduling Attributes

Time Scheduling parameters can be specified for the topology as a whole or for each individual topological element.

Allows the provider to present different topological views to the client at different time slots.

+--rw schedules* [schedule-id] | +--rw schedule-id uint32 | +--rw start? yang:date-and-time | +--rw schedule-duration? string | +--rw repeat-interval? string

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Abstract TE Topology: Topology as a Service

Model allows the provider to present the network in abstract TE terms on per client basis

Model allows the client to request changes to the abstract TE Topology that is presented to it

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C-B1

S1 S2

S3

C-B2

C-B3

S5S4

S6 S7 S8

S3

S9

S5

S8

S11

M-SRLG 200

M-SRLG 200

Abstract TE Topology exported to Client Blue

S3

S9

S8

S11

Abstract TE Topology exported to Client Red

Abstract TE Topologies – Usage Exampledraft-liu-teas-yang-te-topo

S9 S10 S11

C-R1

C-R2

C-R3

Provider Network

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Pending/Open Items Open Discussion Items:

Relationship with “generic network topology” model Pending Work-Items:

Incremental Notifications Appendix for use-cases

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