Transcription of Introduction to Segment Routing
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Introduction to Segment Routing
Introduction to Segment RoutingSegmentRouting(SR) is a flexible,scalableway of doingsourcerouting. Overviewof SegmentRouting,page1 How SegmentRoutingWorks,page2 Examplesfor SegmentRouting,page3 Benefitsof SegmentRouting,page4 SegmentRoutingGlobalBlock,page6 AdditionalReferencesfor SegmentRouting,page8 Overview of Segment RoutingSegmentRouting(SR) is a flexible,scalableway of sourcechoosesa path andencodesit in the packetheaderas an orderedlist of identifierfor any type of segmentis identifiedby the segmentID (SID)consistingof a flat unsigned32-bitinteger. Segmentinstructioncan be: Go to node N usingthe shortestpath Go to node N over the shortestpath to node M and then followlinks Layer1, Layer2, and Layer3 ApplyserviceSWith segmentrouting,the networkno longerneedsto maintaina per-applicationand ,it obeysthe forwardinginstructionsprovidedin the a smallnumberof extensionsto CiscoIntermediateSystem-to-IntermediateS ystem(IS-IS)and OpenShortestPath First (OSPF) can operatewith an MPLS(MultiprotocolLabelSwitching)or an IPv6 data plane,and it integrateswith the rich multiservicecapabilitiesof MPLS,includingLayer3 VPN (L3 VPN),VirtualPrivateWire Service(VPWS),VirtualPrivateLANS ervice(VPLS),andEthernetVPN (EVPN).
Introduction to Segment Routing SegmentRouting(SR)isaflexible,scalablewayofdoingsourcerouting. • OverviewofSegmentRouting, page 1 • HowSegmentRoutingWorks, page 2
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