You want to limit the fraction of an interface's bandwidth available to EIGRP for routing updates.
To modify the fraction of the total bandwidth available to EIGRP, use the ip bandwidth-percent configuration command:
Router1# configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router1(config)#interface Serial0.1 Router1(config-subif)#ip bandwidth-percent eigrp 55 40 Router1(config-subif)#end Router1#
This example shows how to restrict EIGRP process number 55 to use, at most, 40% of the available capacity of this link. By default, EIGRP will limit its own bandwidth utilization to ensure that it never takes more than 50% of a link's capacity. However, this default isn't always appropriate. Sometimes you need to reduce this fraction to reduce overall congestion. And sometimes the total bandwidth value specified on an interface is not accurate.
For example, in Recipe 7.7 we discussed how to change what the router thinks the interface's bandwidth is. If this value is significantly lower than the real physical bandwidth of the interface, you might want to increase the fraction that EIGRP can use. This can help to improve network convergence times when EIGRP suddenly needs to exchange a large amount of routing information.
In the following example, we have manually reduced bandwidth value on this interface to 32Kbps. Since this is much less than the true value, we have then increased the fraction that EIGRP can use to 200%, bringing it up to a maximum of 56Kbps, which would be the default for a real 128kbps circuit:
Router1# configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router1(config)#interface Serial0.1 Router1(config-subif)#bandwidth 32 Router1(config-subif)#ip bandwidth-percent eigrp 55 200 Router1(config-subif)#end Router1#
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