Inquiring About Routing Problems

In order to debug routing related problems, you might want to clear the IP routing table and specify selection criteria for route inquiries. Debugging routing related problems can become quite cumbersome, especially if the routing table is large. Clearing the routing table enables you to start debugging from a smaller, more manageable base.

You can then selectively allow new routes into the routing table and gradually build up a node's connectivity. This helps to establish a point where connectivity works and a point where it no longer works. That is, it eliminates a known set of routes that work and reduces the scope of the problem.

The following subsections discuss how to:

  • Clear the routing table

  • Specify selection criteria for route inquiries