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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).]

  • Remote LFA support for LDP in IS-IS (QFX10000 line of switches) —Starting in Junos OS Release 21.4R1, you can configure a remote loop-free alternate (LFA) path to extend the backup provided by the LFA route in an IS-IS or OSPF network. This feature is especially useful for Layer 1 metro rings where the remote LFA is not directly connected to the point of local repair (PLR). You can reuse the existing LDP implementation for the MPLS tunnel setup for the protection of IS-IS and OSPF networks and subsequent LDP destinations. By doing this, you eliminate the need for RSVP-TE backup tunnels for backup coverage.

    [See Understanding Remote LFA over LDP Tunnels in IS-IS Networks and Remote LFA over LDP Tunnels in OSPF Networks Overview.

  • 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.]

  • Support for multiple update threads to service a peer group (MX Series, PTX Series, and QFX Series)—Starting in Junos OS Release 21.4R1, you can configure multiple update threads to service a peer group to improve the performance of BGP. You can use the group-split-size configuration statement at the [edit system processes routing bgp update-threading] hierarchy level and configure a threshold value (0 through 2000).

    [See update-threading.]

  • Support for ICMP extension (QFX5100)—Starting in Junos OS Release 21.4R1, we've implemented RFC 5837, Extending ICMP for Interface and Next-Hop Identification, for both numbered and unnumbered aggregated Ethernet interfaces. We can now append additional fields to the following ICMP (IPv4 and IPv6) messages:

    • ICMPv4 Time Exceeded

    • ICMPv4 Destination Unreachable

    • ICMPv6 Time Exceeded

    • ICMPv6 Destination Unreachable

    Use the set system allow-icmp4-extension command to enable ICMP extension.

    [See Configure ICMP Features.]