Troubleshooting Redistribution - Troubleshooting IPv4 and IPv6 Redistribution

6 important questions on Troubleshooting Redistribution - Troubleshooting IPv4 and IPv6 Redistribution

What are 3 ways a Seed Metric can be defined, in order of preference?

  1. By applying a route map configuration to the redistribute command.
  2. By using the metric paramater with the redistribute command.
  3. By using the default-metric command.

What are the 4 main areas of troubleshooting Route Redistribution?

  1. Source Routing Protocol
    Use the appropriate Show commands to ensure the Source Routing Protocol has learned the route you want to redistribute.
  2. Route Selection
    Ensure that the route from the Source Routing Protocol is actually in the Routing Table.
  3. Redistribution Configuration
    Check the Redistribution configuration. Things like: Metric, Route Filtering, Routing Process ID or AS number.
  4. Destination Routing Protocol
    Check characteristics of Destination Routing Protocol and if it treats external routes differently.

What is important to note about the default seed metric when redistributing into EIGRP?

By default it is set to infinity and it won't be advertised to other EIGRP routers.
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What is important to note about OSPFv2 redistribution?

It is important to consider the Subnets keyword. Without it, only Classfull networks will be redistributed.

What are important differences in OSPFv3 redistribution versus OSPFv2?

  1. The Include-Connected option is added
    In OSPFv3 connected routes are not automatically redistributed.
  2. The Subnet option is missing.
    Classless and Classfull concepts does not exist in IPv6.

What things do you need to check when troubleshooting Redistribution with Route Maps?

  1. Is the correct Route Map applied?
  2. Is Permit or Deny specified correctly?
  3. If an access list is used in the match statement, is the access list correct?
  4. If there are Set statements, you need to verify that the correct values have been specified to accomplish your desired goal.
  5. If a route doesn't match any statement the route falls in the implicit deny and is not redistributed.
  6. If a nonexistent route map is attached to the redistribution command, none of the routes are redistributed.

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