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Routing Protocols

  • Enhanced support to handle S flag, D flag and A flags in IS-IS (PTX10001, PTX10001-36MR, PTX10003, PTX10004, and PTX10008)—Starting in Junos OS Evolved Release 21.4R1, you can set the S flag to allow the label binding type, length and values (TLV) to leak through the IS-IS level (Level 1 or Level 2). You can set the A flag to program the penultimate-hop popping (PHP). You can set the D flag to prevent the leaking of the label binding TLV from Level 2 back to Level 1. Use the no-binding configuration statement at the [edit protocols isis source-packet-routing no-binding-sid-leaking] hierarchy level to disable label binding TLV leaks.

    [See Handling of the IS-IS Binding SID 'S' Flag and RFC 7794 Prefix Attribute Flags.]

  • Service to correlate FPCs with P2MP sub-LSPs (PTX10001-36MR, PTX10004, PTX10008, and PTX10016)—Starting in Junos OS Evolved Release 21.4R1, you can correlate FPCs with point-to-multipoint (P2MP) sub-LSPs. An FPC can act as an ingress, egress, or transit point for more than one sub-LSP of the same P2MP LSP. If an FPC fails, then all the sub-LSPs that it serves are affected.

    You can configure a service that enables you to monitor the correlation between FPCs and the P2MP sub-LSPs—branch paths—that are on an LSR. This information helps you evaluate the effect a failed FPC has on the correlated sub-LSPs. When you enable tracing, the service also provides system log messages (during an FPC outage) that provide detailed information about the sub-LSPs affected.

    [See Configuring a Service to Correlate Point-to-Multipoint sub-LSPs with FPCs.]

  • Support for FAD and FAPM on the traffic engineering database and BGP-LS (PTX10001-36MR, PTX10003, PTX10004, and PTX10008)—Starting in Junos OS Evolved Release 21.4R1, we support Flex ALgo Definition (FAD) and Flex Algo Prefix Metric (FAPM) on traffic engineering database and BGP-LS. You can store FADs and FAPMs into TED and BGP Link-State and store multiple prefix-sids for a prefix into BGP Link-State. You can import the FAD and FAPM entries from the traffic engineering database to BGP-LS and export the FAD entries from BGP-LS to the traffic engineering database.

    [See What is Flexible Algorithm Definition (FAD).]

  • Support for IPv6 ping, IPv6 traceroute, and ECMP traceroute for Labeled-IS-IS segment routing paths (PTX10001-36MR, PTX10003, PTX10004, and PTX10008)—Starting in Release 21.4R1, Junos OS Evolved supports IPv6 ping, IPv6 traceroute, and ECMP traceroute for Labeled-IS-IS segment routing paths. 

    [See ping and traceroute mpls segment-routing isis.]

  • Support for link delay measurement and advertising in IS-IS (PTX10001-36MR, PTX10003, PTX10004, PTX10008, and PTX10016)—Starting in Junos OS Evolved Release 21.4R1, you can measure and advertise various performance metrics in IP networks with scalability, by using several IS-IS probe messages. These metrics can then be used to make path-selection decisions based on network performance.

    [See How to Enable Link Delay Measurement and Advertising in IS-IS.]