The reconfiguration was too ambitious. It attempted simultaneously to introduce a new routing protocol and a new addressing scheme. See the Tutorial "Routing Principles and IOS Implementation Considerations" for a discussion of how routes are chosen for routing table installation. The person writing this first configuration forgot that prefix length -- the number of one bits in the subnet mask -- is considered before administrative distance. While he correctly observed that OSPF's administrative distance is higher (., less preferred) than IGRP's, he forgot that the VLSM subnets introduced into the network were more specific, and thus preferable, to any IGRP route | CertificationZone Page 1 of 11 Date of Issue 11-01-1999 Routing Principles and IOS Implementation Lab Scenario by Howard C. Berkowitz Objective A Reality Check Router Configurations PARSLEY S Configuration THYME S Configuration SAGE s Configuration ROSEMARY S Configuration First Pass Router Configurations PARSLEY s Configuration THYME s Configuration SAGE s Configuration ROSEMARY s Configuration Analysis TIP The Distance command Objective The existing configuration runs IGRP. Convert the network to run OSPF without using redistribution. Run OSPF and IGRP in parallel at first continuing the use of IGRP as the active routing protocol until you verify OSPF operation. Figure 1 shows the initial physical configuration and addressing of the routers. Initial Configuration Figure 1 A Reality Check Can you ping and traceroute to all interfaces including the loopbacks Why Why not http studyguides s. Issue 3 IssueDate 11-01-1999 CP 11 06 01 CertificationZone Page 2 of 11 Router Configurations These configurations work with IGRP. PARSLEY S Configuration parsley s ru Building configuration. Current configuration version service udp-small-servers service tcp-small-servers hostname parsley enable password pass ip subnet-zero interface LoopbackO ip address interface EthernetO ip address interface Ethernet1 no ip address shutdown interface SerialO ip address no fair-queue interface Serial1 no ip address shutdown interface TokenRing1 no ip address shutdown interface TokenRing0 ip address ring-speed 16 router igrp 1 network network network ip host thyme ip host sage ip host rosemary line con 0 exec-timeout 0 0 line aux 0 transport input all line vty 0 4 no login end parsley THYME S Configuration http studyguides s. Issue 3 IssueDate 11-01-1999 CP 11
