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CCNP ENARSI Certification Cram Notes : Layer 3 Technologies

1.2 Troubleshoot route map for any routing protocol (attributes, tagging, filtering)

Route maps are a powerful tool used to manipulate and filter routing updates. They can be used to modify the attributes of routes, tag routes with additional information, and filter routes based on various criteria. Here are some steps to troubleshoot route maps for any routing protocol:

1. Check the configuration of the route map. Verify that the route map is configured correctly, with the correct match and set statements. Check for any errors in the configuration that may be causing issues.

2. Check the routing table for the expected routes. Verify that the routing table is populated with the expected routes, and that the route map is being applied correctly.

3. Check the route map processing order. Route maps are processed in the order in which they are applied, with the first match being used. Verify that the route map processing order is correct, and that there are no overlapping or conflicting route maps.

4. Use the "show route-map" command to troubleshoot. This command displays detailed information about the route map, including the match and set statements and the number of routes matched.

5. Use debug commands to troubleshoot route map issues. Debugging can provide valuable information about route map behavior and can help to identify configuration errors or network connectivity problems.

6. Check for filtering issues. If routes are not being advertised or received correctly, check the route map filtering criteria to ensure that they are correct. Verify that the route map is not filtering out valid routes.

7. Verify that tagging is working correctly. If routes are being tagged with additional information, check that the tagging is working correctly and that the correct tags are being applied.

By following these troubleshooting steps, you can identify and resolve issues with route maps for any routing protocol.

1.3 Troubleshoot loop prevention mechanisms (filtering, tagging, split horizon, route poisoning)

Loop prevention mechanisms are used to prevent routing loops, which can occur when there are multiple paths to a destination network. Here are some steps to troubleshoot loop prevention mechanisms:

1. Check the configuration of the loop prevention mechanisms. Verify that mechanisms such as filtering, tagging, split horizon, and route poisoning are configured correctly, and that they are appropriate for the network topology and routing requirements.

2. Verify that the loop prevention mechanisms are enabled on all routers. Check the configuration of each router to ensure that loop prevention mechanisms are enabled on the correct interfaces and that the correct mechanisms are being used.

3. Check the routing table on each router. Verify that the routing table is populated with the expected routes, and that the loop prevention mechanisms are working correctly.

4. Verify that the routers are exchanging routing information correctly. Check for connectivity between routers, and ensure that the correct routing updates are being sent and received.

5. Use debug commands to troubleshoot loop prevention issues. Debugging can provide valuable information about routing protocol behavior and can help to identify configuration errors or network connectivity problems.

6. Check for split horizon issues. Split horizon is a loop prevention mechanism that prevents a router from advertising a route back out the interface from which it was learned. Verify that split horizon is enabled on the correct interfaces and that it is working correctly.

7. Check for route poisoning issues. Route poisoning is a loop prevention mechanism that marks a failed route as unreachable, preventing routers from using it. Verify that route poisoning is working correctly and that failed routes are being marked as unreachable.

By following these troubleshooting steps, you can identify and resolve issues with loop prevention mechanisms, such as filtering, tagging, split horizon, and route poisoning.


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