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Routing TCP/IP, Volume I (CCIE Professional Development) by Jeff Doyle

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Troubleshooting Integrated IS-IS

The basic methods for troubleshooting IS-IS are very similar to the methods for troubleshooting OSPF, as discussed in Chapter 9. A major aspect of troubleshooting Integrated IS-IS that is different from the other IP routing protocols is that IS-IS uses CLNS PDUs rather than IP packets. If you are troubleshooting the protocol itself, remember that you are troubleshooting CLNS, not IP.

As with all routing protocols, the first troubleshooting step is to check the route table for accurate information. If an expected route entry is missing or incorrect, the remainder of the troubleshooting task is to determine the source of the problem.

After the routing table, the link state database is the most important source ...

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