Routing Options

Enhancements to prefix-limit and accepted-prefix-limit configuration statements, and updates to show bgp neighbor command (ACX1000, EX9200, MX Series, PTX5000, and QFX10002)— Starting from Junos OS Release 21.2R1, 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.

The show bgp neighbor command has been enhanced to display the following additional information:

• Count of prefixes that are dropped or hidden based on network layer reachability information (NLRI) when the maximum 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 configuration statements.

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

Forwarding class counters support for flat-file-profile (MX Series and vMX)—Starting in Junos OS Release 21.2R1, the flat-file-profile statement supports forwarding class counters. You can now switch from the ingress CoS queue counters configuration to the forwarding class counters configuration. To enable the forwarding class counters feature, configure the use-fc-ingress-stats statement at the [edit accounting-options flat-file-profile profile-name] hierarchy level.

[See flat-file-profile (Accounting Options).]