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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.]