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Troubleshooting Exercises

1

In the network of Figure 3-2 and the associated configurations, the route entries for Piglet are changed from

    Piglet(config)# ip route 192.168.1.0 255.255.255.0 192.168.1.193
    Piglet(config)# ip route 10.4.0.0 255.255.0.0 192.168.1.193

to

    Piglet(config)# ip route 192.168.1.0 255.255.255.224 192.168.1.193
    Piglet(config)# ip route 10.0.0.0 255.255.0.0 192.168.1.193

What is the result?

2

Example 3-59 shows the static route configurations for the routers in Figure 3-15.

Figure 3-15. The network for Troubleshooting Exercise 2.


Example 3-59. Static route configurations for routers in Figure 3-15.
!RTA
ip route 172.20.96.0 255.255.240.0 172.20.20.1
ip route 172.20.82.0 255.255.240.0 172.20.20.1
ip route 172.20.64.0 255.255.240.0 172.20.20.1
ip route 172.20.160.0 255.255.240.0 172.20.30.255
ip route 172.20.144.0 255.255.240.0 172.20.30.255
ip route 172.20.128.0 255.255.240.0 172.20.30.255
_________________________________________________
!RTB
ip route 172.20.192.0 255.255.240.0 172.20.16.50
ip route 172.20.224.0 255.255.240.0 172.20.16.50
ip route 172.20.128.0 255.255.240.0 172.20.16.50
ip route 172.20.160.0 255.255.240.0 172.20.30.255
ip route 172.20.144.0 255.255.240.0 172.20.30.255
ip route 172.20.128.0 255.255.240.0 172.20.30.255
_________________________________________________
!RTC
ip route 172.20.192.0 255.255.240.0 172.20.16.50
ip route 172.20.208.0 255.255.255.0 172.20.16.50
ip route 172.20.224.0 255.255.240.0 172.20.16.50
ip route 172.20.96.0 255.255.240.0 172.20.20.1
ip route 172.20.82.0 255.255.240.0 172.20.20.1
ip route 172.20.64.0 255.255.240.0 172.20.20.1

Users are complaining of several connectivity problems in this internet. Find the mistakes in the static route configurations.

3

Figure 3-16 shows another network in which users are complaining of connectivity problems. Example 3-60 through Example 3-63 show the route tables of the four routers.

Figure 3-16. The network for Troubleshooting Exercise 3.

[View full size image]


Find the mistakes in the static route configurations.

Example 3-60. The route table of RTA in Figure 3-16.
RTA#show ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
       i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, * - candidate default,
       U  per-user static route
Gateway of last resort is not set
     10.0.0.0/8 is subnetted, 9 subnets
S      10.5.9.0 [1/0] via 10.5.3.2
S      10.5.8.0 [1/0] via 10.5.3.2
S      10.5.7.0 [1/0] via 10.5.3.2
S      10.5.6.0 [1/0] via 10.5.3.2
S      10.5.5.0 [1/0] via 10.5.3.2
S      10.5.4.0 [1/0] via 10.5.3.2
C      10.5.3.0 is directly connected, Serial0
C      10.5.2.0 is directly connected, TokenRing1
C      10.5.1.0 is directly connected, TokenRing0
RTA#

Example 3-61. The route table of RTB in Figure 3-16.
RTB#show ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
       i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, * - candidate default,
       U  per-user static route
Gateway of last resort is not set
     10.0.0.0/8 is subnetted, 9 subnets
S      10.5.9.0 [1/0] via 10.5.5.2
S      10.5.8.0 [1/0] via 10.5.5.2
S      10.5.7.0 [1/0] via 10.5.5.2
S      10.5.6.0 [1/0] via 10.5.5.2
C      10.5.5.0 is directly connected, Serial1
C      10.5.4.0 is directly connected, TokenRing0
C      10.5.3.0 is directly connected, Serial0
S      10.5.2.0 [1/0] via 10.5.3.1
S      10.5.1.0 [1/0] via 10.5.3.1
RTB#

Example 3-62. The route table of RTC in Figure 3-16.
RTC#show ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
       i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, * - candidate default,
       U  per-user static route, o - ODR
Gateway of last resort is not set
     10.0.0.0/24 is subnetted, 8 subnets
S      10.5.9.0 [1/0] via 10.5.7.2
S      10.5.8.0 [1/0] via 10.5.5.1
C      10.5.7.0 is directly connected, Serial1
C      10.5.6.0 is directly connected, Ethernet0
S      10.1.1.0 [1/0] via 10.5.5.1
C      10.5.5.0 is directly connected, Serial0
S      10.5.3.0 [1/0] via 10.5.5.1
S      10.5.2.0 [1/0] via 10.5.5.1
RTC#

Example 3-63. The route table of RTD in Figure 3-16.
RTD#show ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
       i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, * - candidate default,
       U  per-user static route, o - ODR
Gateway of last resort is not set
     10.0.0.0/24 is subnetted, 9 subnets
C      10.5.9.0 is directly connected, Ethernet1
C      10.5.8.0 is directly connected, Ethernet0
C      10.5.7.0 is directly connected, Serial0
S      10.5.6.0 [1/0] via 10.5.7.1
S      10.5.5.0 [1/0] via 10.5.7.1
S      10.4.5.0 [1/0] via 10.5.7.1
S      10.5.3.0 [1/0] via 10.5.7.1
S      10.5.2.0 [1/0] via 10.5.7.1
S      10.5.1.0 [1/0] via 10.5.7.1
RTD#


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