Network Ninja

The basic requirements to get EIGRP running are as follows

1. The EIGRP Process and the the EIGRP Autonomous System (AS) number.

The EIGRP Process is the routing protocol that needs to be started on the router and the EIGRP Autonomous System (AS) number is a 16-bit arbitrary number and works by identifying and grouping routers with common AS numbers in the same administrative domain. The significance of this number is that a router will not become a neighbour with another router with a foreign/different AS.

To the enable EIGRP Process as an active routing protocol:

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

Used in an example

Router(config)#router eigrp 1

2. The Participating router interfaces can either be on one or all interfaces (EIGRP on internal interfaces and BGP on external interfaces). After the router command EIGRP is enabled but not active on any interfaces. EIGRP will not produce Hello packets not advertise the network until it is activated on particular links.

To active Interfaces to the EIGRP process one uses the network command. The network command is a pattern-matching tool (interfaces with matching IP addresses are active in EIGRP and subnets on those interfaces are advertised through EIGRP).

Router(config-router)#network network-number

Used in an Example

Router(config-router)#network 10.0.0.0

3. The Passive-interface command can be used on interfaces with no neighbours, or on interfaces that run another routing protocol (BGP). 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 192.168.0.1 255.255.255.0
Router(config-if)#exit
Router(config)#interface fastethernet 0/1
Router(config-if)#ip address 192.168.0.2 255.255.255.0
Router(config-if)#exit
Router(config)#router eigrp 1
Router(config-router)#network 192.168.0.0 255.255.255.0
Router(config-router)#passive-interface fastethernet 0/1

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.