ICND2 OECG Chapter 11 Troubleshooting Lab (with Dynagen/Dynamips)
Posted by Aragoen Celtdra on 18th May 2008
A sampling of the lab setup from Wendell Odom’s ICND2 book. I used Dynagen/Dynamips for the lab. Perhaps I’ll post the Dynagen config file later.
Router R1
R1(config)#int fa1/0
R1(config-if)#no shut
R1(config-if)#ip address 10.1.1.1 255.255.255.0
R1(config-if)#int fa2/0
R1(config-if)#no shut
R1(config-if)#ip address 10.1.11.1 255.255.255.0
!
!
R1(config)#router eigrp 99
R1(config-router)#network 10.0.0.0
Router R2
R2(config)# int fa1/0
R2(config-if)#no shut
R2(config-if)#ip address 10.1.1.2 255.255.255.0
R2(config-if)#int fa2/0
R2(config-if)#ip address 10.1.22.2 255.255.255.0
!
!
R2(config)#router eigrp 99
R2(config-router)#network 10.0.0.0
Router R3
R3(config)#int fa1/0
R3(config-if)#no shut
R3(config-if)#ip address 10.1.1.3 255.255.255.0
R3(config-if)#int fa2/0
R3(config-if)#no shut
R3(config-if)#ip address 10.1.33.3 255.255.255.0
!
!
R3(config)#router eigrp 99
R3(config-router)#network 10.1.1.3 0.0.0.0
R3(config-router)#network 10.1.13.3 0.0.0.0 –> this is a deliberately mistaken configuration
Router R4
R4(config)#int fa1/0
R4(config-if)#no shut
R4(config-if)#ip address 10.1.1.4 255.255.255.0
R4(config-if)#int fa2/0
R4(config-if)#no shut
R4(config-if)#ip address 10.1.44.4 255.255.255.0
!
!
R4(config)#router eigrp 99
R4(config-router)#network 10.0.0.0
R4(config-router)#passive-interface fa1/0 –> deliberate error. Correct config is to set it on Fa2/0
SW1
No configuration necessary
================================================
After Configuring the above scenario:
- Verify routing protocols enabled on the correct interfaces
- show ip eigrp interfaces
- Verify that the correct network command parameters are configured.
- show ip protocol
- Verify that the expected networks are being routed
- show ip route, sh ip route eigrp
- if working properly, each router should know 3 eigrp routes – for each of the LAN interfaces on the other 2 routers.
Notes from my personal lab experience:
- If you configure a network 10.4.5.6 without wildcard mask, EIGRP auto-summarizes and will match all interfaces (because they all start with 10.x.x.x ip address.
- If you configure it with a wildcard mask (for example 0.0.0.255), it will take it but will not match any interfaces
- You can see the configuration in sh run and sh ip protocol
- You may configure a network 10.0.0.0 (without mask) and match all interfaces (because eigrp summarizes).
- Or you can configure a network command (with wildcard mask)for each interface you want to match individually. For example, network 10.1.33.3 0.0.0.255.
- clear ip eigrp neighbor - lookup the what, how and why.
- You can restart the EIGRP configuration by using no router eigrp ASN-number.
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