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Home Documentation Junos OS Junos CLI Reference CLI Reference A

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accepted-prefix-limit

date_range 19-Nov-23
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Syntax

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accepted-prefix-limit {
    maximum number;
    teardown <percentage-threshold> idle-timeout (forever | minutes);
    drop-excess <percentage>;
    hide-excess <percentage>;
  }

Hierarchy Level

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[edit logical-systems logical-system-name protocols bgp family (inet | inet6) (any | flow | labeled-unicast | multicast | unicast)],
[edit logical-systems logical-system-name protocols bgp family route-target],
[edit logical-systems logical-system-name protocols bgp group group-name family (inet | inet6) (any | flow | labeled-unicast | multicast | unicast)],
[edit logical-systems logical-system-name protocols bgp group group-name family route-target],
[edit logical-systems logical-system-name protocols bgp group group-name neighbor address family (inet | inet6) (any | flow | labeled-unicast | multicast | unicast)],
[edit logical-systems logical-system-name protocols bgp group group-name neighbor address family route-target],
[edit logical-systems logical-system-name routing-instances routing-instance-name protocols bgp family (inet | inet6) (any | flow | labeled-unicast | multicast | unicast)],
[edit logical-systems logical-system-name routing-instances routing-instance-name protocols bgp family route-target],
[edit logical-systems logical-system-name routing-instances routing-instance-name protocols bgp group group-name family (inet | inet6) (any | flow | labeled-unicast | multicast | unicast)],
[edit logical-systems logical-system-name routing-instances routing-instance-name protocols bgp group group-name family route-target],
[edit logical-systems logical-system-name routing-instances routing-instance-name protocols bgp group group-name neighbor address family (inet | inet6) (any | flow | labeled-unicast | multicast | unicast)],
[edit logical-systems logical-system-name routing-instances routing-instance-name protocols bgp group group-name neighbor address family route-target],
[edit protocols bgp family (inet | inet6) (any | flow | labeled-unicast | multicast | unicast)],
[edit protocols bgp family accepted-prefix-limit (inet | inet6)(any | flow | labeled-unicast | multicast | unicast)],
[edit protocols bgp family route-target],
[edit protocols bgp group group-name family (inet | inet6) (any | flow | labeled-unicast | multicast | unicast)],
[edit protocols bgp group group-name family route-target],
[edit protocols bgp group group-name neighbor address family (inet | inet6) (any | flow | labeled-unicast | multicast | unicast)],
[edit protocols bgp group group-name neighbor address family route-target],
[edit routing-instances routing-instance-name protocols bgp family (inet | inet6) (any | flow | labeled-unicast | multicast | unicast)],
[edit routing-instances routing-instance-name protocols bgp family route-target],
[edit routing-instances routing-instance-name protocols bgp group group-name family (inet | inet6) (any | flow | labeled-unicast | multicast | unicast)],
[edit routing-instances routing-instance-name protocols bgp group group-name family route-target],
[edit routing-instances routing-instance-name protocols bgp group group-name neighbor address family (inet | inet6) (any | flow | labeled-unicast | multicast | unicast)],
[edit routing-instances routing-instance-name protocols bgp group group-name neighbor address family route-target]

Description

Configure a limit to the number of prefixes that can be accepted in a BGP peer session. When that limit is exceeded, a system log message is sent.

This statement provides the ability to log a message, reset the BGP session, or do both when the number of prefixes received from the peer and accepted by policy exceeds a preset limit. This functionality is identical to the prefix-limit functionality except that it operates against accepted prefixes rather than received prefixes.

Options

maximum number

When you set the maximum number of prefixes, a message is logged when that number is exceeded.

  • Range: 1 through 4,294,967,295 (232 – 1)

teardown <percentage>

(Optional) If you include the teardown statement, the session is torn down when the maximum number of prefixes is reached. If you specify a percentage, messages are logged when the number of prefixes exceeds that percentage. After the session is torn down, it is reestablished in a short time unless you include the idle-timeout statement. Then the session can be kept down for a specified amount of time, or forever. If you specify forever, the session is reestablished only after you issue a clear bgp neighbor command.

If the teardown statement is not configured, a message is logged when the number of prefixes exceeds the value configured for the maximum option.

  • Range: 1 through 100

idle-timeout (forever | timeout-in-minutes)

(Optional) If you include the idle-timeout statement, the session is torn down for a specified amount of time, or forever. If you specify a period of time, the session is allowed to reestablish after this timeout period. If you specify forever, the session is reestablished only after you intervene with a clear bgp neighbor command.

  • Range: 1 through 2400

drop-excess <percentage>

(Optional) 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>

(Optional) 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. If the percentage is modified, the routes are re-evaluated automatically. If the active routes drop below the specified percentage, those routes are kept as hidden.

To recover the routes from the hidden state, run the following commands to refresh the routes and get a complete re-evaluation of the routes:

clear bgp table <table-name> and clear bgp neighbor <neighbor address> soft-inbound

Note:

You can include either the teardown <percentage>, drop-excess <percentage>, or hide-excess <percentage> statement option one at a time.

Required Privilege Level

routing—To view this statement in the configuration.

routing-control—To add this statement to the configuration.

Release Information

Statement introduced in Junos OS Release 9.2.

drop-excess <percentage> and hide-excess <percentage> options are introduced in Junos OS Release 21.2.

drop-excess <percentage> and hide-excess <percentage> options are introduced in Junos OS Evolved Release 21.3R1.

Related Documentation

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