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cbt nuggets ccna 200 301 free download.G0/1 G0/0 G0/1 Finding a Mismatch Area 10.1.22.2/24 10.1.1.2/24 10.1.1.4/24 10.1.44.4/24 The "Troubleshooting OSPF Interfaces" section earlier in this chapter explains how to use the show ip ospf interface command to list area numbers and find OSPF area mismatches. The next section explains how to use the debug ip ospf adj command to observe the same problem, as shown in Example 11.11. This command lists messages with OSPF neighbor adjacency events and also shows messages that identify region mismatches (with R2).Example 11-11 Using R1debug to Identify a Problem with a Mismatched RegionRl# debug Ip ospf adj OSPF adjacency events debugging is on Rl#.Nov 15 13:42:02.288: OSPF-1 ADJ Gi0/0: Rev pkt from 10.1.1.2, area 0.0.0.0, mismatched area 0.0.0.1 in the headerRl# Rl# undebug all All possible debugging has been turned offAs listed in Table H-4, the debugipospfadj command helps resolve misconfiguration and verification issues in the OSPF area. In the example, the first line of messages in the shaded section lists messages about packets ("Rev pkt") received from 10.1.1.2 (R2's IP address). The remaining messages indicate the presence of an incorrect zone ID 0.0.0.1, or zone 1, for the other router at address 0.0.0.0 (R1). (Note that these messages are 32-bit zone numbers represented as 8-bit arrays of binary numbers).Finding Duplicate OSPF Router IDsExample 11-12 shows Rl and R3 attempting to use RIDl.l.l.lo Interestingly, for the duplicate OSPFRID problem between R1 and R3, the router automatically generates log messages. The (shaded) log messages are shown at the end of Example 11-12. The showipospf command on R3 and R1 also illustrates that the user can easily list the RIDs on each router, noting that the same values are used for both.Examples 11-12 compare on R1 and R3. SPF router ID! Next, on R3: ! R3 lists the RID of 1.1 . .1.1