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Segment Routing

  • Support for flexible algorithm in OSPFv2 for segment routing traffic engineering (PTX10001-36MR, PTX10003, and PTX10008)—Starting in Junos OS Evolved Release 21.1R1, you can thin-slice a network by defining flexible algorithms that compute paths using different parameters and link constraints based on your requirements. For example, you can define a flexible algorithm that computes a path to minimize IGP metric and define another flexible algorithm to compute a path based on traffic engineering metric to divide the network into separate planes. This feature allows networks without a controller to configure traffic engineering and utilize segment routing capability of a device.

    To define a flexible algorithm, include the flex-algorithm statement at the [edit routing-options] hierarchy level.

    To configure a device to participate in a flexible algorithm, include the flex-algorithm statement at the [edit protocols ospf source-packet-routing] hierarchy level.

    [See How to Configure Flexible Algorithms in OSPF for Segment Routing Traffic Engineering.]

  • Support for strict SPF and IGP shortcut (PTX10001-36MR, PTX10003, and PTX10008)— Starting in Junos OS Evolved Release 21.1R1, you can configure segment routing algorithm 1 (strict SPF) and advertise its SIDs in IS-IS link-state PDU (LSPDU) and use these SIDs to create SR-TE tunnels to forward the traffic by using the shortest IGP path to reach the tunnel-end point while avoiding loops. You can also specify a set of prefixes in the import policy, based on which the tunnel can redirect the traffic to a certain destination. You can use SR-Algo 1 (strict SPF) along with SR-Algo 0 (default SPF) by default when SPRING is enabled.

    [See How to Enable Strict SPF SIDs and IGP Shortcut, prefix-segment, and source-packet-routing.]

  • Support for adjacency SID and prefix SID in pure IPv6 environment (PTX10008)–Starting in Junos OS Evolved Release 21.1R1, you can configure adjacency segment identifier (SID) and prefix SID for MPLS segment routing using IS-IS in pure IPv6 networks.

    [See Static Adjacency Segment Identifier for ISIS.]