Troubleshooting Redistribution - Troubleshooting Advanced Redistribution Issues
6 important questions on Troubleshooting Redistribution - Troubleshooting Advanced Redistribution Issues
How can Suboptimal routing be solved when there are multiple points of redistribution?
What is important to keep in mind when troubleshooting suboptimal routing caused by route redistribution?
- Be able to recognize that mutual route redistribution is occuring at multiple points in the network.
- Be able to recognize the different speeds of the links.
- Be able to identify the seed metrics and how they behave differently for different protocols.
- Be able to change metrics on the boundary router to change the behavior.
What can often cause a routing loop? And how can it be solved?
- When there is 2 or more ASBRs
- And a route is received on an ASBR and propagated to the other ASBR with a better Administrative Distance and vice versa.
- Can be solved by changing the default AD for the specific routes. Either in the Source or in the Destination routing protocol.
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How can the command Distribute List in OSPF be used to prevent routing loops?
- By using a prefix list and denying the route that is causing the loop.
- The prefix list is then used in the OSPF process command Distribute List Prefix.
What is the most robust way to prevent Routing Loops and prevent the routes be redistributed back in to the Source Routing Protocol?
- Create routing maps tagging the routes on different entry points with different tags.
- Add route maps to destination routing protocol redistribute command.
- create routing maps denying routes with the specific tags.
- Add route maps to source routing protocol redistribute command.
What is important to remember regarding Route Maps implicit match all?
- Route maps have an implicit deny at the end.
- When configuring route maps to alter specific routes an empty Sequence number can be added to allow the rest of routes without altercation.
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