CCNA Cisco Certified Network Associate Study Guide - FTP Server

270 Chapter 5 � IP Routing
variance command controls the load balancing between the best metric and
the worst acceptable metric.
There are two more commands that are used to help control traffic distribution
among IGRP load-sharing routes: traffic-share balanced and
traffic-share min.
The router output below shows the options available under the router
igrp as command prompt.
Router(config-router)#variance ?
Metric variance multiplier
Router(config-router)#traffic-share ?
balanced Share inversely proportional to metric
min All traffic shared among min metric paths
The router output above shows the variance command, which is the
available metric multiplier. The traffic-share output shows the two
options: balanced and min. The traffic-share balanced command tells
the IGRP routing protocol to share inversely proportional to the metrics,
and the traffic-share min command tells the IGRP routing process to use
routes that have only minimum costs.
The load balancing and traffic sharing are covered more in depth in Sybex’s
CCNP: Routing Study Guide.
Configuring IGRP in Our Internetwork
Configuring IGRP is pretty straightforward and not much different
from configuring RIP. You do need to decide on an AS number before you
configure your routers. Remember that all routers in your internetwork must
use the same AS number if you want them to share routing information. In
our internetwork, we’ll use AS 10 to configure the routers.
Okay, let’s configure our internetwork with IGRP routing.