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IS-IS Network Design Solutions by Scott Sturgess, Abe Martey

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Interpreting the Output of Key IS-IS show Commands

This section details the output of some of the key troubleshooting commands discussed in the previous section. The Cisco IOS show commands provide information about activities occurring on the router and serve as excellent tools for diagnosing problems.

The output of the following commands are examined based on the topology and configuration of the routers in Figure 10-1:

Figure 10-1. Simple IS-IS domain topology.

  • show clns

  • show clns protocol

  • show clns neighbors

  • show clns interface

  • show isis database

  • show isis topology

  • show isis spf-log

Figure 10-1 shows a simple topology of an IS-IS domain consisting ...

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