Foundation Summary

The Foundation Summary provides a convenient review of many key concepts in this chapter. If you are already comfortable with the topics in this chapter, this summary might help you recall a few details. If you just read this chapter, this review should help solidify some key facts. If you are doing your final prep before the exam, the following tables are a convenient way to review the day before the exam.

Table 4-9 summarizes the commands covered in this chapter.

Table 4-9. Summary of EIGRP Commands
Router(config)#router eigrp autonomous-system-numberStarts the EIGRP processes on the router with the specified autonomous system number.
Router(config-router)#network network-number [wildcard-mask]Advertises the networks that match the network mask.
Router(config-router)#no auto-summaryDisables automatic summarization.
Router(config-if)#ip summary-address eigrp autonomous-system-number address maskEnables manual summarization.
Router(config-router)#eigrp stub [receive-only | connected | static | summary]Used on single-neighbor routers in a hub-and-spoke environment. Minimizes local routing table and advertises local subnets to core.
Router(config-if)#bandwidth speed-of-lineIdentifies bandwidth on interfaces where router cannot automatically determine them. Used primarily on serial lines.
Router(config-if)#ip bandwidth-percent eigrp autonomous-system-number percentEIGRP, by default, will take only 50% of bandwidth for routing protocol traffic. Allows adjustment of that percentage.
Router(config-router)#variance multiplierAllows unequal-cost paths to proportionally load share.
Router(config-if)#ip hello-interval eigrp autonomous-system-number secondsChanges hello interval. May be used to lengthen interval (reducing overhead) or to shorten the interval (decreasing convergence time).
Router(config-if)#ip hold-time eigrp autonomous-system-number secondsDefines how long to wait without hearing a hello from a neighbor before declaring it dead. By default, it is three times the length of the hello-interval.
Router#show ip eigrp neighborsDisplays information drawn from the neighbor table.
Router#show ip eigrp topologyDisplays information drawn from the topology table.
Router#show ip eigrp trafficShows statistics about the EIGRP traffic reaching the router.
Router#debug eigrp packetShows EIGRP packets sent and received.
Router#debug ip eigrp neighborsShows the hello packets sent and received by the router and the neighbors discovered by this process.
Router#debug ip eigrp summaryShows when a summary is changed on the router.