Network Ninja

Working from the my last couple of EIGRP posts I am going to try and crystallize some of the material found by working through questions found in Stewart, B,D., Gough, C (2008). CCNP BSCI Official Exam Certification Guide, Fourth Edition. Indianapolis: Cisco Press.

Imagine a router that has two interfaces -fastethernet0/0 is 10.1.1.1 and serial0/0 10.2.2.2 Normally, EIGRP would run with the “network  10.0.0.0″ command, which would enable both interfaces. There are two ways discussed in this chapter that could be used to specify that one interface run EIGRP and not the other. What are those two techniques?

The two techniques that would allow one interface to run EIGRP are:

1. The passive-interface command. This command prevents EIGRP from speaking on an interface; it does not send hello packets or advertisements, neighbours are not found on passive-interfaces and routes are not exchanged. However the prefix of the passive interface is exchanged to EIGRP neighbours on other interfaces.
   Router(config)#interface fastethernet 0/0
Router(config-if)#ip address 10.1.1.1 255.255.255.0
Router(config-if)#exit
Router(config)#interface serial 0/0
Router(config-if)#ip address 10.2.2.2 255.255.255.0
Router(config-if)#exit
Router(config)#router eigrp 1
Router(config-router)#network 10.0.0.0
passive-interface command for FE0/0
Router(config-router)#passive-interface fastethernet 0/0
passive-interface command for S0/0
Router(config-router)#passive-interface serial 0/0

2. The second method would be to use the extended format of the network command by including the EIGRP wild card bits one can restrict the EIGRP process to a single network.
   Router(config)#router eigrp 1
network command for FE0/0
Router(config-router)#network 10.1.1.1 0.0.0.0
network command for S0/0
Router(config-router)#network 10.2.2.2 0.0.0.0

Resources:

Stewart, B,D., Gough, C (2008). CCNP BSCI Official Exam Certification Guide, Fourth Edition. Indianapolis: Cisco Press.

Notes and Notices:

This is a part of my personal BSCI notes and research to assist myself in learning and understanding the concepts and theory for the BSCI exam. I learn by making notes reading and writing things down and wish to file them where I can’t lose them. These notes are not to be seen, judged or mistaken for replacements to Cisco recognized and authorized training which I personally support and attend and suggest you undertake if you are going for the BSCI Certification.