Configuration Exercises

You can find the answers to the Configuration Exercises in Appendix E, "Answers to Configuration Exercises."

1:	Autonomous System 65531 in Figure 1-14 is a core AS. Figure 1-14. The Internetwork for Configuration Exercise 1 Configure EGP on RTA and RTB, with the following constraints: - The data link interior to the AS is not advertised to any exterior neighbor. - RTA advertises the network attached to its S1 interface to RTB; with this exception, no other inter-AS link is advertised between RTA and RTB. - RTA and RTB advertise a default route to their exterior neighbors, in addition to networks learned from other autonomous systems. Neither gateway advertises a default route to its internal neighbor.
2:	Example 1-26 shows the route table of RTC in Figure 1-15. Figure 1-15. The Internetwork for Configuration Exercise 2 Example 1-26 The Route Table of RTC in Figure 1-15 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 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 Gateway of last resort is not set I 192.168.105.0 [100/8976] via 192.168.6.2, 00:01:00, Serial1 I 192.168.110.0 [100/8976] via 192.168.6.2, 00:01:00, Serial1 I 192.168.100.0 [100/8976] via 192.168.10.2, 00:01:00, Serial2 I 192.168.120.0 [100/8976] via 192.168.10.2, 00:01:01, Serial2 C 192.168.2.0 is directly connected, Serial0 C 192.168.6.0 is directly connected, Serial1 C 192.168.10.0 is directly connected, Serial2 RTC# Using redistribution, configure RTC to advertise all EGP-learned networks into AS 65510, and all internal networks except 192.168.105.0 to the core AS. Protect against route feedback by ensuring that none of the networks internal to AS 65510 are advertised back via EGP. The process ID in this configuration is the same as the local AS number.
3:	Example 1-27 shows the route table of RTD in Figure 1-15. Example 1-27 The Route Table of RTD in Figure 1-15 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 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 Gateway of last resort is not set C 192.168.3.0 is directly connected, Serial0 C 192.168.7.0 is directly connected, Serial1 R 192.168.230.0 [120/1] via 192.168.7.2, 00:00:14, Serial1 R 192.168.200.0 [120/2] via 192.168.7.2, 00:00:15, Serial1 R 192.168.220.0 [120/1] via 192.168.7.2, 00:00:15, Serial1 R 192.168.210.0 [120/2] via 192.168.7.2, 00:00:15, Serial1 RTD# Configure RTD with the following parameters: - Only 192.168.220.0 and 192.168.230.0 are to be advertised to AS 65531. - No routing protocol is redistributed into EGP. - EGP is redistributed into the IGP of AS 65515. - 192.168.3.0 is advertised into AS 65515 with a metric of 1. - 192.168.100.0, from RTC, is advertised into AS 65515 with a metric of 1. - 192.168.120.0, from RTC, is advertised into AS 65515 with a metric of 3. - All other routes are advertised into AS 65515 with a metric of 5.
4:	Example 1-28 shows the route table of RTE in Figure 1-15. Example 1-28 The Route Table of RTE in Figure 1-15 RTE# 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 O 192.168.125.0/28 [110/74] via 192.168.130.6, 00:01:03, Serial1 C 192.168.4.0/24 is directly connected, Serial0 192.168.225.0/28 is subnetted, 1 subnets O E2 192.168.225.160 [110/50] via 192.168.130.18, 00:01:04, Ethernet0 192.168.215.0/24 is variably subnetted, 3 subnets, 3 masks O 192.168.215.161/32 [110/65] via 192.168.130.6, 00:01:04, Serial1 O E2 192.168.215.192/26 [110/50] via 192.168.130.18, 00:01:04, Ethernet0 O E1 192.168.215.96/28 [110/164] via 192.168.130.6, 00:01:04, Serial1 192.168.130.0/24 is variably subnetted, 7 subnets, 4 masks D 192.168.131.192/27 [90/2195456] via 192.168.130.6, 00:16:49, Serial1 D 192.168.131.96/27 [90/409600] via 192.168.130.18, 00:16:49, Ethernet0 O 192.168.131.97/32 [110/11] via 192.168.130.18, 00:01:05, Ethernet0 D 192.168.131.64/27 [90/409600] via 192.168.130.18, 00:15:01, Ethernet0 D 192.168.131.8/30 [90/2195456] via 192.168.130.6, 00:16:49, Serial1 C 192.168.131.4/30 is directly connected, Serial1 C 192.168.131.16/28 is directly connected, Ethernet0 RTE# Configure RTE with the following parameters: - No IGP is redistributed into EGP. - EGP is not redistributed into any IGP. - All the internal networks of AS 65520 are advertised to AS 65531. - The internal routers of AS 65520 can forward packets to any network advertised by RTA. - All process IDs are the same as the AS number. - All OSPF interfaces are in area 0.
5:	In Figure 1-16, AS 65525 has been added to the internetwork of the previous exercises. RTF's Ethernet interface has an IP address of 192.168.1.3/24. Figure 1-16. The Internetwork for Configuration Exercise 5 Configure this router to peer only with RTB and make any necessary configuration changes to support third-party neighbors.