Nokia Segment Routing

Course number: OP00085
Course duration: 4 days
Price: €3,200

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).

Self-paced learning

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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

OP00085