Foundation Summary


The "Foundation Summary" section of each chapter lists the most important facts from the chapter. Although this section does not list every fact from the chapter that will be on your exam, a well-prepared candidate should, at a minimum, know all the details in each "Foundation Summary" before going to take the exam.

Table 14-9 summarizes the commands covered in this chapter.

Table 14-9. Summary of Commands



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

Starts the EIGRP processes on the router with the specified autonomous system number.

Router(config-router)# network network-number wildcard-mask

Shows the networks to be advertised.

Router(config-router)# no auto-summary

Given a hierarchical addressing design, disables the automatic summarization to the Internet IANA network address.

Router(config-if)# ip summary-address eigrp autonomous-system-number address mask

Enables you to summarize the networks manually, having disabled automatic summarization.

Router(config-router)# eigrp stub [ receive-only connected static summary ]

Used on small-capacity routers in a hub-and-spoke WAN environment. The router has no other neighbors and accesses the network through a distribution layer router. Only a small routing table is required at the stub router, which is provided with a default route to the advertising ABR.

Router(config-if)# bandwidth speed-of-line

Issued at the interface level and a logical construct to determine the real bandwidth manually. This command is used mainly on serial lines. Bandwidth will influence some routing decisions and dial-on-demand implementations .

Router(config-if)# ip bandwidth-percent eigrp autonomous-system-number percent

Enables you to change the bandwidth percentage. EIGRP, by default, will only take up to 50% of bandwidth.

Router(config-router)# variance multiplier -number

Allows unequal-cost paths to load balance. Paths included in the equation will send a proportional amount of traffic across the unequal links.

Router(config-if)# ip hello-interval eigrp autonomous-system-number seconds

Changes how often the Hello is sent out of an interface. This is used to tune the network by increasing the frequency and thus reducing convergence timers.

Router(config-if)# ip hold-time eigrp autonomous-system-number seconds

This defines how long the router believes its neighbor to be alive without hearing a Hello from the neighbor. By default, it is three times that of the Hello timer. Remember that if the Hello timer is changed, the hold timer is not automatically changed, but must be changed manually.

Router# show ip eigrp neighbors

Displays information drawn from the neighbor table.

Router# show ip eigrp topology

Displays information drawn from the topology table.

Router# show ip eigrp traffic

Shows the EIGRP traffic passing through the router.

Router# debug eigrp packet

Shows the packets sent and received by the router. The packet types to be monitored can be selected. Up to 11 types are available.

Router# debug eigrp neighbors

Shows the Hello packets sent and received by the router and the neighbors discovered by this process.

Router# debug ip eigrp route

The default if the command debug ip eigrp is issued. Shows dynamic changes made to the routing table.

Router# debug ip eigrp summary

Shows the process taken when a summary (manual or auto) is changed on the router.

CCNP BSCI Exam Certification Guide
CCNP BSCI Exam Certification Guide (CCNP Self-Study, 642-801) (3rd Edition)
ISBN: 1587200856
EAN: 2147483647
Year: 2002
Pages: 194
Authors: Clare Gough © 2008-2017.
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