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The
bandwidth-percent
command configures the percentage of bandwidth that may be used by
EIGRP on an interface. By default, EIGRP is set to use only up to 50%
of the bandwidth of an interface to exchange routing information. In
order to calculate its percentage, the
bandwidth-percent
command relies on the value set by the
bandwidth
command.
Use the
bandwidth-percent
command when the bandwidth setting of a link does not reflect its true
speed. The bandwidth value may be artificially low for a variety of
reasons, such as to manipulate the routing metric, or to accommodate
an oversubscribed multipoint Frame Relay configuration. Regardless of
the reasons, configure EIGRP to overcome an artificially low bandwidth
setting by setting the
bandwidth-percent
to a higher number. In some cases, it may even be set to a number
above 100.
For example, assume that the actual bandwidth of a router serial
link is 64 Kbps, but the bandwidth value is set artificially low, to
32 Kbps. The figure shows how to modify the behavior of EIGRP so that
it limits routing protocol traffic according to the actual bandwidth
of the serial interface. The example configuration sets the
bandwidth-percent on serial 0/0 to 100 percent for the EIGRP process
running in AS 24. Since 100 percent of 32 kbps is 32, EIGRP will be
allowed to use half of the actual bandwidth of 64 Kbps.
Note: The EIGRP percentage of bandwidth for IP may be changed with the
following command:
ip bandwidth-percent eigrp
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Lab Activity
e-Lab Activity: The bandwidth-percent Command
This lab is using bandwidth-percent
command to configure the percentage of bandwidth that may be
used by EIGRP on an interface.
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