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Nokia Segment Routing

Course number: OP00085
Course duration: 4 days
Price: $3,125 US

Course overview

This course provides students with the essential knowledge required to deploy a network’s transport-tunnel infrastructure using segment routing. It examines segment routing concepts, terminology, and signaling through an enhanced link-state routing protocol, such as IS-IS and OSPF. The course discusses the control-plane and the data-plane behavior of the protocols. Configuration and signaling required to instantiate segment routing tunnels with traffic engineering (TE) constraints, such as explicit hops, admin groups, TE metric, shared-risk link groups and the maximum number of hops, are covered in detail. It also includes end-to-end and local tunnel resiliency approaches through secondary paths and fast re-route, respectively. The course will thoroughly assess the use of Flex-Algo as an alternative way to implement traffic engineering in a network that uses segment routing. All use cases and lab exercises are based on the model-driven command-line interface (MD-CLI). 

Course objectives

After completing the course, students should be able to: 

  • Identify segment routing as a method to deploy the transport-tunnel infrastructure of a network
  • Describe the concepts of segment, segment ID, and segment routing
  • Explain the relationship between segment IDs and MPLS labels
  • Describe how routing protocols (OSPF and IS-IS) have been extended to enable segment routing
  • Identify the traffic-engineering constraints that can be imposed on a segment routing tunnel, also known as LSP
  • List and explain the different options available to calculate a suitable path for a traffic-engineering-constrained segment routing tunnel



  • Explain how a segment routing LSP can have one primary and one or more secondary paths associated with it
  • Explain that when multiple paths are added to a given LSP, seamless Bidirectional Forwarding Detection (BFD) needs to be enabled for the LSP to detect path failures and trigger the switchover
  • Describe Loop Free Alternate (LFA) paths and how they make fast re-route (FRR) possible
  • Identify the different LFA types: standard LFA, remote LFA, directed LFA, and topology independent LFA
  • Identify flexible algorithms (flex-algo) as an alternative way to implement traffic engineering in a network that uses segment routing

Course modules

Module 1 - Introduction to segment routing

  • Drivers for the use of data tunneling
  • MPLS data encapsulation and forwarding
  • Segments, segment IDs and segment routing
  • Differences between segment routing and other traditional MPLS label signaling protocols
  • Segment ID values

Module 2 - Basic segment routing configuration and operation

  • Link-state routing protocol extensions to support segment routing
  • Configuring IS-IS to support segment routing
  • Configuring OSPF to support segment routing
  • Using segment routing tunnels that follow the IGP shortest path

Module 3 - Segment routing tunnels with traffic engineering constraints

  • Traffic engineering fundamentals
  • Enabling traffic engineering
  • Link-state routing protocol extensions to support traffic engineering
  • Configuring IS-IS to advertise TE information
  • Configuring OSPF to advertise TE information
  • Local calculation of a TE-constrained LSP path
  • Configuring segment routing LSPs with traffic engineering constraints
  • Label stack reduction for CSPF-calculated paths
  • Secondary LSP paths and seamless-BFD
  • Retry-on-error vs resignal behavior
  • LSP path preference
  • Ensuring LSP path diversity
  • Using segment routing tunnels with TE constraints (SR-TE)



Module 4 - SR-TE with a path computation element

  • Path Computation Element (PCE)
  • Path Computation Element Protocol (PCEP)
  • The Nokia Network Services Platform (NSP)
  • Configuring segment routing LSPs calculated by the PCE

Module 5 - Segment routing fast re-route

  • Loop-Free Alternate (LFA) paths
  • Enabling segment routing fast re-route
  • Remote Loop-Free Alternate (R-LFA) paths
  • Directed Loop-Free Alternate (D-LFA) paths
  • Topology-Independent Loop-Free Alternate (TI-LFA) paths
  • Precedence of the different LFA options

Module 6 - Flexible algorithms (flex-algo)

  • Flexible algorithm basics
  • Flexible algorithm configuration
  • Advertisement of flex-algo information by IS-IS
  • Advertisement of flex-algo information by OSPF
  • Fast re-route for flex-algo instances
  • Steering traffic into flex-algo segment routing tunnels

Schedule and registration


Nokia Segment Routing

Price for this course is $3125 (USD) per seat

Duration: 4 days (9 am - 4 pm)

Course dates Delivery Format Virtual Time Zone or Course Location Sort descending Language Registration
- Virtual instructor-led Chicago - CST English (US) Register Now
- Virtual instructor-led New Delhi - IST English (US) Register Now
- Virtual instructor-led Paris - CET English (US) Register Now
- Virtual instructor-led Paris - CET English (US) Register Now

Nokia Service Routing Certification (SRC) Program and Confidentiality Agreement

Review the confidentiality agreement.