Mpls-Te Automatic Bandwidth Overview - Cisco ASR 9000 Series Configuration Manual

MPLS-TE Automatic Bandwidth

MPLS-TE Automatic Bandwidth Overview

MPLS-TE automatic bandwidth is configured on individual Label Switched Paths (LSPs) at every head-end.
MPLS-TE monitors the traffic rate on a tunnel interface. Periodically, MPLS-TE resizes the bandwidth on
the tunnel interface to align it closely with the traffic in the tunnel. MPLS-TE automatic bandwidth can perform
these functions:
• Monitors periodic polling of the tunnel output rate
• Resizes the tunnel bandwidth by adjusting the highest rate observed during a given period
For every traffic-engineered tunnel that is configured for an automatic bandwidth, the average output rate is
sampled, based on various configurable parameters. Then, the tunnel bandwidth is readjusted automatically
based upon either the largest average output rate that was noticed during a certain interval, or a configured
maximum bandwidth value.
This table lists the automatic bandwidth functions.
Table 6: Automatic Bandwidth Variables
Function
Application frequency
Requested bandwidth
Collection frequency
Highest collected
bandwidth
Delta
The output rate on a tunnel is collected at regular intervals that are configured by using the application
command in MPLS-TE auto bandwidth interface configuration mode. When the application period timer
Cisco ASR 9000 Series Aggregation Services Router MPLS Configuration Guide, Release 4.3.x
138
Command Description
application command Configures how often the
tunnel bandwidths
changed for each tunnel.
The application period is
the period of A minutes
between the bandwidth
applications during which
the output rate collection
is done.
bw-limit command Limits the range of
bandwidth within the
automatic-bandwidth
feature that can request a
bandwidth.
auto-bw collect Configures how often the
command tunnel output rate is
polled globally for all
tunnels.
— You cannot configure this
value.
— You cannot configure this
value.
Implementing MPLS Traffic Engineering
Default Value
24 hours
0 Kbps
5 min
—
—
OL-28381-02