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In the first part of the display, we see how trace reports a successful ping from router 1 to router 3 through router 2 in the lab setup of three routers we have used throughout the book The trace reports the path that is taken from source to destination The second part of Fig 8-13 shows an unsuccessful trace Here, the trace command reports that the router can find the subnet where the destination IP address should be located, but it cannot find the host on the subnet, so it queries all devices it knows about on this subnet to see if they know about the target address This display will continue indefinitely until it is stopped by the break sequence (pressing the Ctrl and 6 keys simultaneously) With internetworks that are either poorly designed, or which are experiencing a fault condition, the paths selected for routes can become suboptimal, leading to poor performance A typical example of this is if a bridge or repeater is connected through the internetwork to two interfaces on a router This will lead to a router receiving duplicate routing updates effectively receiving the same updates on two interfaces This is a condition that a router cannot deal with effectively, and unpredictable routing decisions result The trace command output can identify these types of problems by reporting the path packets take from source to destination If a suboptimal path is taken, the interconnections made on the internetwork need to be examined to resolve any conditions that the routing protocols cannot handle Overview of OSPF Troubleshooting OSPF and other link state protocols are more complex to troubleshoot than distance vector protocols The problem we will consider initially is that of a ping packet that is not returned successfully from a remote host Assuming that the Physical and Data Link layers have checked out and that all devices have OSPF enabled for the same autonomous system number, troubleshooting an OSPF internetwork starts off in the same way as for an IGRP internetwork The first task is to review the routing table entries, because each routing device from source to destination must have routing table entries that enable a packet to be routed in both directions for a ping request to be successful Assuming that the ping fails because of a lack of routing table entries, we would look first for any passive interfaces or distribute lists stopping the route information from being disseminated If none exists, the OSPF configuration for each router device must be reviewed All interfaces that are to participate in OSPF routing need to have the network numbers to which they belong listed in the network commands that are entered as subcommands under the OSPF major command You can check whether OSPF is running on all expected interfaces by issuing the show ip ospf interface command for each interface (A sample display was illustrated in Fig 4-17) Obviously, any interface that is not reporting OSPF information for this command is incorrectly configured and needs to be investigated.

Scenario You are trying to use a third-party application to access a remote computer via TCP/IP You are unable to connect to the remote server To properly troubleshoot this problem, you must know where to begin Most communication problems with TCP/IP can be categorized as one of the following:

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It is very easy to determine which problem is occurring in a given situation Start by trying to access the resource via the IP address rather than the hostname by pinging the IP address For example, if the problem is related to name resolution, pinging the hostname might not work, but pinging the IP address will This indicates that, because you can communicate with the IP address but not the hostname, you are having name-resolution problems If you cannot access the resource via the IP address, this indicates a connectivity problem the system does not exist or it is turned off, or you have a network problem

Another useful command for troubleshooting at this level is the show ip ospf neighbor command, illustrated in Fig 8-14, which identifies all the neighbors the router knows about via the OSPF protocol If a router that you expect to see on this list does not show up, further investigation into the missing router's configuration is required

To follow up on the troubleshooting steps, let s look at an example of network issues and the troubleshooting steps you can use to help you diagnose the problem In this example, you get a call from a network user who says she cannot print to the laser printer in her department but has no problem accessing the servers or any other PC She was able to print to the printer yesterday but is unable to print to it today In fact, no one in the department is able to print to the printer, which is a network printer The user verifies that the printer is turned on; she has even

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