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Routing Options

  • Enhancements to prefix-limit and accepted-prefix-limit configuration statements, and updates to show bgp neighbor command (PTX10001-36MR, PTX10003, PTX10004, PTX10008, QFX5130-32CD, QFX5130-48C, and QFX5220)— Starting in Junos OS Evolved Release 21.3R1, the prefix-limit and accepted-prefix-limit configuration statements include the following options:

    • drop-excess <percentage>—If you include the drop-excess <percentage> option, the excess routes are dropped when the maximum number of prefixes is reached. If you specify a percentage, the routes are logged when the number of prefixes exceeds that percentage value of the maximum number.
    • hide-excess <percentage>—If you include the hide-excess <percentage> option, the excess routes are hidden when the maximum number of prefixes is reached. If you specify a percentage, the routes are logged when the number of prefixes exceeds that percentage value of the maximum number.

    We have enhanced the show bgp neighbor command to display the following additional information:

    • Count of prefixes that are dropped or hidden based on network layer reachability information (NLRI) when the maximum number of allowed prefixes threshold is exceeded
    • Alerts when a peer starts to drop or hide routes
    • Configuration details of the prefix-limit and accepted-prefix-limit statements

    [See prefix-limit, accepted-prefix-limit, show bgp neighbor, and Multiprotocol BGP.]

  • Support for MPLS import policy (PTX10008)—Starting in Junos OS Evolved Release 21.3R1, the mpls-import policy-name CLI configuration statement at the [edit routing-options resolution rib rib-name] hierarchy level enables multi-path scenarios where a node-SID label points to multiple forwarding paths. The mpls-import policy-name configuration statement applies the resolution import policy for next-hop resolution.

    [See resolution.]