If you set the maximum-path to 1, you disable load
balancing. When a packet is process switched, load balancing over equal-cost paths occurs on a
per-packet basis. When packets are fast switched, load balancing over equal-cost paths occurs on
a per-destination basis.
Con?¬?guring Load Balancing Across Unequal-Cost Paths
EIGRP can also balance traf?¬?c across multiple routes that have different metrics, which is called
unequal-cost load balancing. The degree to which EIGRP performs load balancing is controlled
with the variance command.
The multiplier parameter for the variance command is a value from 1 to 128, used for load
balancing. The default is 1, which indicates that only equal-cost load balancing is being
performed. The multiplier de?¬?nes the range of metric values that are accepted for load balancing
by the EIGRP process.
NOTE Although the maximum transmission unit (MTU) is exchanged in EIGRP packets
between neighbor routers, MTU is not factored into the EIGRP metric calculation.=
NOTE If you test load balancing, do not ping to or from routers that use fast-switching
interfaces because these router-generated packets are process switched rather than fast switched
and might produce confusing results.
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