Table 6: Automatic Bandwidth Variables
Default ValueDescriptionCommandFunction
24 hoursConfigures 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.
application commandApplication frequency
0 KbpsLimits the range of
bandwidth within the
automatic-bandwidth
feature that can request a
bandwidth.
bw-limit commandRequested bandwidth
5 minConfigures how often the
tunnel output rate is
polled globally for all
tunnels.
auto-bw collect
command
Collection frequency
—
You cannot configure this
value.
—
Highest collected
bandwidth
—
You cannot configure this
value.
—
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
expires, and when the difference between the measured and the current bandwidth exceeds the adjustment
threshold, the tunnel is reoptimized. Then, the bandwidth samples are cleared to record the new largest output
rate at the next interval.
When reoptimizing the LSP with the new bandwidth, a new path request is generated. If the new bandwidth
is not available, the last good LSP continues to be used. This way, the network experiences no traffic
interruptions.
If minimum or maximum bandwidth values are configured for a tunnel, the bandwidth, which the automatic
bandwidth signals, stays within these values.
When more than 100 tunnels are auto-bw enabled, the algorithm will jitter the first application of every
tunnel by a maximum of 20% (max 1hour). The algorithm does this to avoid too many tunnels running
auto bandwidth applications at the same time.
Note
Cisco IOS XR MPLS Configuration Guide for the Cisco CRS Router, Release 5.1.x
191
Implementing MPLS Traffic Engineering
MPLS-TE Automatic Bandwidth
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