EIGRP Bandwidth for IPv4
By default, EIGRP uses only up to 50 percent of an interface’s bandwidth for EIGRP information. This prevents the EIGRP process from over-utilizing a link and not allowing enough bandwidth for the routing of normal traffic.
Use the ip bandwidth-percent eigrp command to configure the percentage of bandwidth that can be used by EIGRP on an interface.
Router(config-if)# ip bandwidth-percent eigrp as-number percent
In Figure 1, R1 and R2 share a very slow 64 kb/s link. The configuration to limit how much bandwidth EIGRP uses is shown, along with the bandwidth command. The ip bandwidth-percent eigrp command uses the amount of configured bandwidth (or the default bandwidth) when calculating the percent that EIGRP can use. In this example, EIGRP is limited to no more than 50 percent of the link's bandwidth, as shown in Figure 2. Therefore, EIGRP never uses more the 32 kb/s of the link’ bandwidth for EIGRP packet traffic.
To restore the default value, use the no form of this command.
Use the Syntax Checker in Figure 3 to limit the bandwidth used by EIGRP between R2 and R3, to 75 percent of the link’s bandwidth.
EIGRP Bandwidth for IPv6
To configure the percentage of bandwidth that can be used by EIGRP for IPv6 on an interface, use the ipv6 bandwidth-percent eigrp command in interface configuration mode. To restore the default value, use the no form of this command.
Router(config-if)# ipv6 bandwidth-percent eigrp as-number percent
Figure 4 shows the configuration of the interfaces between R1 and R2 to limit the bandwidth used by EIGRP for IPv6.