Cisco CCNP / BSCI Exam Tutorial: Using Distribute Lists
To be successful on the BSCI exam and in earning your CCNP, you’ve got to master route redistribution. This isn’t as easy as it sounds, because configuring route redistribution is only half the battle. Whether it’s on an exam or in a real-world production network, you’ve got to identify possible points of trouble before you configure route redistribution – and you need to be able to control redistribution as well. You may have an OSPF domain with 100 routes, but only need to redistribute 10 of them into a neighboring RIPv2 domain. You’ve got to know how to do that, and one method is the use of a distribute-list.
A distribute-list is an access-list that is used to determine what routes can and cannot be redistributed. Distribute-lists let you specify what routes will be filtered from the process. You can use standard or extended ACLs, and you can filter routes that are coming into a routing process or being injected into another process.
In the following example, R1 is redistributing RIP routes into OSPF, but only wants to advertise network 150.1.1.0 /24 to other...
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