cisco wan automation engine (wae) network …€¢ opm module computes path for bandwidth...

Cisco WAN Automation Engine (WAE) Network Programmability with Segment Routing

Josh Peters Technical Marketing Engineer

Derek Tay Technical Marketing Engineer

LTRMPL-2104

© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public

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How

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• Objectives

• Concepts

• Lab Workflow

• Conclusion

Agenda


Lab Objectives

• Learn about Cisco WAN Automation Engine (WAE) and how it can be used to provide network visibility, simulation and optimization capabilities

• Learn how WAE together with XTC provides path computation for SR Policies and addresses Bandwidth Use cases

• Introduction to the WAE APIs

LTRMPL-2104 5


WAE Overview

WAE Server

Abstract Network Model

Multivendor + Multilayer

Planning Application Programmatic Interfaces

WAE Design Python NETCONF/REST

< >/ { }

• Explore

• Visualize

• Simulate

• Optimize

• WAE builds an abstracted network model that includes topology and traffic

• Ask WAE to simulate “what-if” scenarios or optimize the model

• WAE is NOT a controller

LTRMPL-2104 6


High Level Solution Building Block

SNMP/

CLINetFlow CORBA BGP-LS PCEP CLI

NC /

YANG“Protocols”South-bound Network Protocols

“Network”Equipment and Devices

“Device Abstraction”Controllers, Protocols, NEDs

“Network Abstraction”Network Model, Path Computation

“Service Abstraction”Service Models and Orchestration

Segment Routing

or RSVP-TE

Optical (DWDM)

WAE

Service Orchestrator (for e.g. NSO)

NSO (NEDs)XTCCTC

Telemetry

LTRMPL-2104 7


WAE Design

Visualization

• Graphical view of link traffic utilization

• Customized topology views

• Traffic paths, LSP paths and shortest path

Capacity Planning

• Full Traffic Matrix and Topology

• Traffic Trending/Forecasting

• Model Network adds/moves/changes

Optimization and Traffic Engineering

• IGP and LSP metrics with detailed reports and recommendations

Network-Wide Simulation Analysis

• Extensive network wide failure analysis

• ‘Worst Case’ analysis of Network

Maintenance Planning

• Risk Analysis of planned outages

• Model Node, Circuit and SRLG failovers

Snapshot from WAE Design

Software installed in a laptop for offline

modelling and analysis

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WAE+XTC is a PCE Controller

• WAE+XTC is Cisco L3 PCE Controller

• XTC or XR Transport Controller:

• Runs as IOS-XR features

• Collect topology: BGP, ISIS, OSPF and BGP Link State

• Deploy tunnel: PCEP SR/RSVP, BGP SR-TE

• Compute: Shortest, Disjoint, Low Latency, Avoidance

• Northbound interface with application: REST

• WAE or Wan Automation Engine:

• Runs as a XTC application

• Collect topology: via XTC

• Collect BW utilization: SNMP, Netflow, Streaming Telemetry (Prototype)

• OPM Module computes path for Bandwidth Optimization, BW On demand use cases

• Northbound API: REST, RESTconf, Netconf

LTRMPL-2104 9


L3 Topology Discovery

XTC 1

1

2

WAE

WAE Design

3

Topology via

REST/YANG

Topology via

BGP-LS/PCEP

LTRMPL-2104 10

© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public 11LTRMPL-2104

Service Driven Path Computation (Non Bandwidth)

XTC

Configure

headend router

with path-

delegated LSP

Path

delegation

NSO

NEDs

NSO

Service1

32

WAE

4

Topology via

BGP-LS/PCEPPath programming

via PCEP

Traffic

Topology via

REST/YANG


Service Driven Bandwidth on Demand

XTC

Configure

headend router

with path-

delegated LSP

Path

delegation

NSO

NEDs

NSO

Service1

32

WAE

4

Path compute request

with BW constraint

5

Topology via

BGP-LS/PCEPPath programming

via PCEP

Traffic

Topology via

REST/YANG


Tactical Bandwidth Optimisation

XTC

Deploy

via PCEP

5

7

8

WAE

Path compute

with BW constraint

New/modify

LSP

BWopt (TTE) app

2

Topology/BW change

Path

response/request

2 Topology change

1

2

1

3

Policy violation

4

Traffic

6

Topology via REST/YANG

Topology via BGP-LS/PCEP

Topology change via BGP-LS

Lab Workflow

© 2018 Cisco and/or its affiliates. All rights reserved. Cisco PublicLTRMPL-2104

Lab Topology

5 1

6 7

8 7

2

4

3

XRVRX

TG

TG

TG

TG

ISIS L2 SR-MPLS NetworkSRGB = 16,000 – 80,000

Default IGP link metric: I:10

Default TE link metric: T:10I:100 I:100

I:100 I:100

XTC3

RR1

XTC4

XTC1

XTC2

RR2

WAE

15


Lab Topology BGPLS

5 1

6 7

8 7

2

4

3

XRVRX

TG

TG

TG

TG



Default TE link metric: T:10

XTC3

RR1

XTC4

XTC1

XTC2

RR2

WAE

BGPLS

BGPLS

16


Lab Topology PCEP

5 1

6 7

8 7

2

4

3

XRVRX

TG

TG

TG

TG



Default TE link metric: T:10

XTC3

RR1

XTC4

XTC1

XTC2

RR2

WAE

PCEP

PCEP

PCEP

PCEP

17


Lab Workflow

Exer. 1 – WAE Design primer


Lab Workflow


Exer. 2 – Introduction to WAE APIs


Lab Workflow



Exer. 3 - Topology Discovery and Updates


Lab Workflow




Exer. 4 - Topology Based Path Computation


Lab Workflow

Exer. 5 – Bandwidth on Demand Use CaseExer. 1 – WAE Design primer





Lab Workflow

Exer. 5 – Bandwidth on Demand Use Case

Exer. 6 – Bandwidth Optimisation Use Case





Let’s start the labs!


Accessing your LAB Pod

• Follow instructions on Lab Guide

• http://wae-dev.cisco.com:8081/index

• Connect to your dCloud POD

• Start Anyconnect and Enter credentials

• Connect: dcloud-lon-anyconnect.cisco.com

• Username:

• Password:

25

http://wae-dev.cisco.com:8080/index


Conclusion

• In this lab you learnt:

• WAE Design as an offline tool to visualize, simulate and optimize your network

• WAE and XTC as a PCE controller

• WAE Server and introduction to the APIs

LTRMPL-2104 27


References

• Segment Routing

• Check out the Segment Routing book

• Stay up-to-date withhttp://www.segment-routing.net/

• WAN Automation Engine

• http://www.cisco.com/go/wae

https://www.amazon.com/dp/B01I58LSUO/ref=cm_sw_su_dp

http://www.segment-routing.net/

https://www.amazon.com/dp/B01I58LSUO/ref=cm_sw_su_dp


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cisco wan automation engine (wae) network …€¢ opm module computes path for bandwidth...

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