Juniper ACX2000 Configuration Guide

the current allocation) or decreases to 80 Mbps (20 percent under the current allocation),
the bandwidth allocation is increased to 120 Mbps or decreased to 80 Mbps, respectively.
To configure the threshold for automatic bandwidth adjustment, include the
adjust-threshold statement:
adjust-threshold percent;
You can include this statement 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)]
Configuring a Limit on Bandwidth Overflow and Underflow Samples
The automatic bandwidth adjustment timer is a periodic timer which is triggered every
adjust interval to determine whether any bandwidth adjustments are required on the
LSP's active path. This interval is typically configured as a long period of time, usually
hours. If, at the end of adjust interval, the change in bandwidth is above a certain adjust
threshold, the LSP is resignaled with the new bandwidth.
During the automatic bandwidth adjustment interval, the router might receive a steady
increase in traffic (increasing bandwidth utilization) on an LSP, potentially causing
congestion or packet loss. To prevent this, you can define a second trigger to prematurely
expire the automatic bandwidth adjustment timer before the end of the current
adjustment interval.
Every statistics interval, the router samples the average bandwidth utilization of an LSP
and if this has exceeded the current maximum average bandwidth utilization, the
maximum average bandwidth utilization is updated.
During each sample period, the following conditions are also checked:
•
Is the current average bandwidth utilization above the active bandwidth of the path?
•
Has the difference between the average bandwidth utilization and the active bandwidth
exceeded the adjust threshold (bandwidth utilization has changed significantly)?
If these conditions are true, it is considered to be one bandwidth overflow sample. Using
the adjust-threshold-overflow-limit statement, you can define a limit on the number of
bandwidth overflow samples such that when the limit is reached, the current automatic
bandwidth adjustment timer is expired and a bandwidth adjustment is triggered. Once
this adjustment is complete, the normal automatic bandwidth adjustment timer is reset
to expire after the periodic adjustment interval.
To specify a limit on the number of bandwidth overflow samples before triggering an
automatic bandwidth allocation adjustment, configure the adjust-threshold-overflow-limit
statement:
adjust-threshold-overflow-limit number;
615Copyright © 2017, Juniper Networks, Inc.
Chapter 20: Configuring MPLS and Pseudowires

Juniper ACX2000 Specifications

General

Brand	Juniper
Model	ACX2000
Category	Network Router
Language	English