Overview
This lab provides information about Segment Routing Traffic Engineering (SRTE) and demonstrates how SRTE leverages Segment Routing (SR) functionality to provide end-to-end inter-domain traffic steering.
In this lab, you will learn how to specify inter-domain explicit paths using both old configuration commands and new SRTE-specific configuration commands. Explore the IOS XR-based Path Computation Element (PCE) XR Transport Controller (XTC). Learn how XTC receives topology and SID information through IGP or BGP link-state (BGP-LS) and handles path computations through PCEP. Fundamentally, the XTC deployment model is distributed similarly to BGP route reflector (RR) deployments. You can also use XTC to compute dynamic paths for locally configured SR policies.
This lab also shows how to automatically instantiate SR policies for services by attaching a BGP community to the service prefixes by using on-demand next-hop (ODN). The service in this lab is a VPNv4 service. These SR policies can be instantiated to provide scalable inter-domain, best-effort reachability or provide a policy-aware, end-to-end inter-domain path for the service traffic. XTC also computes inter-domain disjoint paths, even from distinct head-ends, by simply indicating which paths must be disjoint.
This lab requires familiarity with networking architecture and routing fundamentals.
Check it out here: https://dcloud-cms.cisco.com/demo/segment-routing-id-srte-isis-v1
Scenarios
- Scenario 1: Explore Topology
- Scenario 2: Configure SR Policy Explicit Path Using Old CLI
- Scenario 3: Configure SR Policy Explicit Path Using New CLI
- Scenario 4: Explore XTC
- Scenario 5: Configure SR Dynamic Path Policy
- Scenario 6: Use ODN for Reachability
- Scenario 7: Use ODN with Service Policy
- Scenario 8: Use ODN with Disjoint Service
Requirements
Components
- Cisco IOS XRv 6.2.1
- Cisco VIRL
Features
VIRL | - Virtual environment for building network topologies
- Simulation of networking components
- Capable of running a range of virtual machines (VMs) running Cisco operating systems (IOS-XE, IOS Classic, IOS-XR, and NX-OS)
- Support for third-party VMs
- Capture and analyze network traffic at any node
- Validate configurations prior to physical deployment
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Segment Routing | - Segment Routing (SR) enables a unified, end-to-end, policy-aware network architecture from servers in the data center, through the WAN, and up to the aggregation.
- SR is designed for SDN because it seeks the proper balance between distributed intelligence, centralized optimization, and application-based policy creation.
- Other benefits of SR are related to operational simplicity, better scale (the SR policy is in the packet), and better utilization of the installed infrastructure (lower capex).
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Topology