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CCNA EIGRP LAB Question

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  • CCNA EIGRP LAB Question

    After adding R3 router, no routing updates are being exchanged between R3 and the new location. All other inter connectivity and Internet access for the existing locations of the company are working properly.
    The task is to identify the fault(s) and correct the router configuration to provide full connectivity between the routers.
    Access to the router CLI can be gained by clicking on the appropriate host. All passwords on all routers are cisco.
    IP addresses are listed in the chart below.
    R1
    Fa0/0: 192.168.77.33
    S1/0: 198.0.18.6
    S0/1: 192.168.60.25
    R2
    Fa0/0: 192.168.60.97
    Fa0/1: 192.168.60.113
    S0/0: 192.168.36.14
    R3
    Fa0/0: 192.168.77.34
    Fa0/1: 192.168.60.65
    Fa1/0: 192.168.60.81
    R4
    Fa0/0: 192.168.60.129
    Fa0/1: 192.168.60.145
    S0/1: 192.168.60.26
    Answer and explanation

    We should check the configuration of the new added router first because it does not function properly while others work well. From the command line interface of R3 router, enter the show running-config command
    From the output above, we know that this router was wrongly configured with an autonomous number (AS) of 22. When the AS numbers among routers are mismatched, no adjacency is formed.
    (You should check the AS numbers on other routers for sure)
    To solve this problem, we simply re-configure router R3 with the following commands:
    R3>enable (you have to enter cisco as its password here)
    R3#configure terminal
    R3(config)#no router eigrp 22
    R3(config)#router eigrp 212
    R3(config-router)#network 192.168.60.0
    R3(config-router)#network 192.168.77.0
    R3(config-router)#no auto-summary
    R3(config-router)#end
    R3#copy running-config startup-config
    Check R1 router with the show running-config command:
    Notice that it is missing a definition to the network R3. Therefore we have to add it so that it can recognize R3 router
    R1>enable (you have to enter cisco as its password here)
    R1#configure terminal
    R1(config)#router eigrp 212
    R1(config-router)#network 192.168.77.0
    R1(config-router)#end
    R1#copy running-config startup-config
    Now the whole network will work well. You should check again with ping command from router R3 to other routers!
    Phạm Minh Tuấn

    Email : phamminhtuan@vnpro.org
    Yahoo : phamminhtuan_vnpro
    -----------------------------------------------------------------------------------------------
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