6.6 Configuring EIGRP
6.6.1 Configuring EIGRP for IP
This section discusses how to configure EIGRP for IP, IPX, and IPX SAP updates by defining the configuration steps and commands available in each of these cases.

Perform the following steps to configure EIGRP for IP:

  1. Use the following to enable EIGRP and define the autonomous system.

    router(config)#router eigrp autonomous-system-number

    autonomous-system-number is the number that identifies the autonomous system. It is used to indicate all routers that belong within the internetwork. This value must match all routers within the internetwork.

     

  2. Indicate which networks are part of the EIGRP autonomous system on this router.

    router(config-router)#network network-number

    network-number is the network number that determines which interfaces of the router are participating in EIGRP and which networks are advertised by the router.

    The network command configures only connected networks. Network 3.1.0.0 (on the far left of the main figure) is not connected, and, therefore, is not part of the configuration.

     

  3. When using serial links, it is important to use the bandwidth on the interface to change the bandwidth used for calculating routing metrics. If you do not change the bandwidth for these interfaces, EIGRP assumes that the bandwidth on the link is of T1 speed. If the link is slower, the router may not be able to converge, routing updates might become lost, or suboptimal path selection may result.

router(config-if)#bandwidth kilobits

kilobits indicates the intended bandwidth in kilobits per second. For generic serial interfaces (PPP or HDLC), set the bandwidth to the line speed. For Frame Relay or point-to-point, set it to the CIR, or for multipoint connections in which all VC's share bandwidth evenly set it to the sum of all CIRs. For hybrid multipoint connections in which bandwidth is not evenly distributed, set the bandwidth to the lowest CIR x the number of PVC's. -

You can change Enhanced IGRP's default percentage of bandwidth it uses to exchange route updates with the following commands:

  • ip bandwidth-percent eigrp
  • ipx bandwidth-percent eigrp
  • appletalk eigrp-bandwidth-percent

Note that the configured bandwidth affects load statistics that appear in some of the show commands.