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accepted-prefix-limit

Syntax

Hierarchy Level

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> statement and specify a percentage, the excess routes are dropped when the number of prefixes exceeds that percentage. If the maximum threshold is modified, the routes are re-evaluated automatically.

hide-excess <percentage>

(Optional) If you include the hide-excess <percentage> statement and specify a percentage, the excess routes are hidden when the number of prefixes exceeds that percentage. 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.