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Routing Protocols

  • Higher DDoS bandwidth for Layer 2 and Layer 3 protocols (PTX1000, PTX10002, PTX10008, QFX10002, QFX10002-60C, QFX10008, and QFX10016)—Starting in Junos OS Release 21.4R1, we support higher distributed denial-of-service (DDoS) bandwidth for many Layer 2 and Layer 3 protocols.

    [See protocols (DDoS) (ACX Series, PTX Series, and QFX Series).]

  • OSPF link delay measurement and advertising (ACX Series, MX Series, PTX Series, and QFX Series)—Starting in Junos OS Release 21.4R1, you can measure and advertise various performance metrics in IP networks with scalability through probe messages that are sent by Two-Way Active Measurement Protocol (TWAMP) Light. OSPF receives probe messages and the measured values from TWAMP Light. OSPF advertises these messages as TLVs in packets. You can use these metrics to make path-selection decisions based on the network performance.

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

  • Enhanced support to handle S flag, D flag and A flags in IS-IS (MX Series and PTX Series)—Starting in Junos OS 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.]

  • Support for FAD and FAPM on traffic engineering database and BGP-LS (ACX Series, MX Series, and PTX Series)—Starting in Junos OS Release 21.4R1, we support FlexAlgo Definition (FAD) and FlexAlgo Prefix Metric (FAPM) on the traffic engineering database and BGP Link State (BGP-LS). You can store FAD and FAPM entries in the traffic engineering database and BGP-LS. You can also store multiple prefix segment identifiers (SIDs) for a prefix in BGP-LS. 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).]