Similarly, if the current average bandwidth utilization is below the active bandwidth of
the path by the configured adjusted threshold (meaning that bandwidth utilization has
gone down significantly), the sample is considered to be an underflow sample. The
adjusted (new signaling) bandwidth after an adjustment due to underflow is the maximum
average bandwidth among the underflow samples. Starting in Junos OS Release 14.1R9,
15.1R7, 16.1R5, 16.2R3, and 17.2R2, all zero value bandwidth samples are considered as
underflow samples, except for the zero value samples that arrive after an LSP comes up
for the first time, and the zero value samples that arrive first after a Routing Engine
switchover.
You can specify a limit on the number of bandwidth underflow samples before triggering
an automatic bandwidth allocation adjustment by configuring the adjust
threshold-underflow-limit statement:
adjust-threshold-underflow-limit number;
These statements can be configured at the following hierarchy levels:
•
[edit protocols mpls label-switched-path lsp-name auto-bandwidth (MPLS Tunnel)]
•
[edit logical-systems logical-system-name protocols mpls label-switched-path lsp-name
auto-bandwidth (MPLS Tunnel)]
You must configure the adjust-threshold and minimum-bandwidth statements whenever
you configure the adjust-threshold-underflow-limit statement. You must configure the
adjust-threshold and maximum-bandwidth statements whenever you configure the
adjust-threshold-overflow-limit statement
•
You must configure a nonzero value for the adjust-threshold statement if you configure
the adjust-threshold-overflow-limit or adjust-threshold-underflow-limit statement.
•
Any bandwidth increase or decrease below the value configured for the adjust-threshold
statement does not constitute an overflow or underflow condition.
•
To prevent unlimited increases in LSP bandwidth (to limit overflow beyond a certain
bandwidth), you must also configure the maximum-bandwidth statement when you
configure the adjust-threshold-overflow-limit statement.
The following describes the other aspects of the adjust-threshold-overflow-limit
statement:
•
It only applies to bandwidth overflows. If the bandwidth is decreasing, the normal
automatic bandwidth adjustment interval is used.
•
It does not affect manually triggered automatic bandwidth adjustment.
•
It applies to single-class DiffServ-TE LSPs.
•
Because the adjust-threshold-overflow-limit statement can trigger a bandwidth
adjustment, it cannot be enabled at the same time as the monitor-bandwidth statement
(for information about that statement, see “Configuring Passive Bandwidth Utilization
Monitoring” on page 617).
•
You cannot configure automatic bandwidth adjustments to occur more often than
every 300 seconds. The adjust-threshold-overflow-limit statement is subject to the
Copyright © 2017, Juniper Networks, Inc.616
ACX Series Universal Access Router Configuration Guide
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