BSCI EIGRP Stub Lab Sim

EIGRP stub Lab

By increasing the first distant office, JS manufactures has extended their business. They configured the remote office router (R3) from which they can reach all Corporate subnets. In order to raise network stableness and lower the memory usage and broadband utilization to R3, JS manufactures makes use of route summarization together with the EIGRP Stub Routing feature. Another network engineer is responsible for the implementing of this solution. However, in the process of configuring EIGRP stub routing connectivity with the remote network devices off of R3 has been missing.



Presently JS has configured EIGRP on all routers in the network R2, R3, and R4. Your duty is to find and solve the connectivity failure problem with the remote office router R3. You should then configure route summarization only to the distant office router R3 to complete the task after the problem has been solved.

The success of pings from R4 to the R3 LAN interface proves that the fault has been corrected and the R3 IP routing table only contains two 10.0.0.0 subnets.

Solution:

First we have to figure out why R3 and R4 can not communicate with each other. Use the show running-config command on router R3:

Notice that R3 is configured as a stub receive-only router. The receive-only keyword will restrict the router from sharing any of its routes with any other router in that EIGRP autonomous system. This keyword will also prevent any type of route from being sent.

Therefore we will remove this command and replace it with the eigrp stub command:


R3>enable

R3#config t

R3(config)#router eigrp 123
R3(config-router)#no eigrp stub receive-only
R3(config-router)#eigrp stub
R3(config-router)#end

R3#copy run start

Now R3 will send updates containing its connected and summary routes to other routers. Notice that the eigrp stub command equals to the eigrp stub connected summary because the connected and summary options are enabled by default.

Next we will configure router R3 so that it has only 2 subnets of 10.0.0.0 network. Use the show ip route command on R3 to view its routing table:

R3#show ip route

Because we want the routing table of R3 only have 2 subnets so we have to summary sub-networks at the interface which is connected with R3, the s0/0 interface of R4.

We will use the ip summary-address eigrp 123 10.2.2.0 255.0.0.0 and 10.2.3.0 at the interface s0/0 of R4 to summary.

R4>enable
R4#config t
R4(config)#interface s0/0
R4(config-if)#ip summary-address eigrp 123 10.2.3.0 255.0.0.0
R4(config-if)#ip summary-address eigrp 123 10.2.2.0 255.0.0.0

R4(config-if)#no shut

R4(config-if)#end

R4#copy run start

Now go back to R3 and use the show ip route command to verify the effect:

R4#show ip route
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