When all the routers in the domain have the common understanding what the Value and its meaning can be defined by the user. To provide a maximum flexibility, the mapping between the algorithm Even more advanced case could be to restrict the path and avoid links withĬertain affinities. A more sophisticated form of constraint can include some extended Simple form of constraint may be to use a particular plane. Some networks are deployed with multiple planes. Many possible constraints may be used to compute a path over a network. Installation of Forwarding Entries for Flexible Algorithm Paths.Flexible Algorithm Prefix-SID Advertisement.Flexible Algorithm Definition Advertisement.Flexible Algorithm Support Advertisement.This section describes the building blocks that are required to support the SR Flexible Algorithm functionality in IS-IS and In IS-IS, the flexible algorithm affinity "exclude-any", "include-any", and "include-all" are supported.īuilding Blocks of Segment Routing Flexible Algorithm Restrictions for Flexible AlgorithmĪ maximum of 20 IS-IS flexible algorithm sessions are supported. Segment routing must be enabled on the router before the Flexible Algorithm functionality is activated. Provides a traffic engineered path automatically computed by the IGP to any destination reachable by the IGP TI-LFA backup paths using the same constraintsĪs the calculation of the primary paths for Flexible Algorithms, for IS-IS. TI LFA and uLoop Avoidance: Allows computation of Loop Free Alternate (LFA) paths. Prior to Cisco IOS XE Bengaluru 17.6.1 release, only Flexible Algorithm affinity exclude-any was supported. This feature supports include-any and include-all affinities in IS-IS. IS-IS Flexible Algorithm Include Affinity Support This feature is enabledĪutomatically when you configure redistribution of routes with strict or Flexible Algorithm SIDs. With this feature, prefix SIDs are provided for all supported algorithms when a prefix is redistributed. Segment Routing Flexible Algorithm Prefix SID Redistribution Used when running the shortest path computations. This allows the TE metric along with the IGP and delay metrics to be Metric type for the IS-IS Flexible Algorithm feature. This feature adds support for the TE metric as a TE Metric Support for IS-IS Flexible Algorithmįlexible algorithm allows user-defined algorithms where the Interior Gateway Protocol (IGP) computes paths based on a user-definedĬombination of metric type (path optimization objective) and constraint. Verifying the Flexible Algorithm Configuration.Flexible Algorithm Prefix Metric Advertisement.Flexible Algorithm Prefix-SID Redistribution.Building Blocks of Segment Routing Flexible Algorithm.Flexible Algorithm allowsįor user-defined algorithms where the IGP computes paths based on a user-defined combination of metric type and constraint. The SR architecture associates prefix-SIDs to an algorithm which defines how the path is computed. Provides a traffic engineered path automatically computed by the IGP to any destination reachable by the IGP. Segment Routing Flexible Algorithm allows operators to customize IGP shortest path computation according to their own needs.Īn operator can assign custom SR prefix-SIDs to realize forwarding beyond link-cost-based SPF. Enabling Segment Routing Flexible Algorithm
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