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CCNP ROUTE Certification Guide: Basic IGP Redistribution

  • Sample Chapter is provided courtesy of Cisco Press.
  • Date: Mar 22, 2010.


  1. "Do I Know This Already?" Quiz
  2. Foundation Topics
  3. Exam Preparation Tasks

Chapter Description

Wendell Odom covers route redistribution basics, redistribution in EIGRP, and redistribution in OSPF in preparation for the CCNP ROUTE exam 642-902.

Exam Preparation Tasks

Planning Practice

The CCNP ROUTE exam expects test takers to review design documents, create implementation plans, and create verification plans. This section provides some exercises that may help you to take a step back from the minute details of the topics in this chapter so that you can think about the same technical topics from the planning perspective.

For each planning practice table, simply complete the table. Note that any numbers in parentheses represent the number of options listed for each item in the solutions in Appendix F, "Completed Planning Practice Tables."

Design Review Table

Table 9-6 lists several design goals related to this chapter. If these design goals were listed in a design document, and you had to take that document and develop an implementation plan, what implementation options come to mind? For any configuration items, a general description can be used, without concern about the specific parameters.

Table 9-6. Design Review

Design Goal

Possible Implementation Choices Covered in This Chapter

A design shows Router R1 as being connected to both an EIGRP and OSPF routing domain, with all external EIGRP routes using a particular set of component EIGRP metrics. How can these metrics be set? (3)

A design shows Router R1 as being connected to two different EIGRP domains, with redistribution planned. Can the design cause the routers to calculate metrics based on both the metric assigned when redistributing and the internal EIGRP topology?

The same design as in the previous row is shown, except describe whether or not the design can cause the routers to calculate metrics based solely on the metric components assigned when redistributing.

A design shows Router R1 as being connected to two different OSPF domains, with redistribution planned, and all routes calculated by including internal and external OSPF distance.

The same design as in the previous row is shown, except that all external route metrics are based solely on external metrics.

Implementation Plan Peer Review Table

Table 9-7 shows a list of questions that others might ask, or that you might think about, during a peer review of another network engineer's implementation plan. Complete the table by answering the questions.

Table 9-7. Notable Questions from This Chapter to Consider During an Implementation Plan Peer Review



A design shows Router R1 as being connected to both an EIGRP and OSPF routing domain. What default metrics will be used by the redistribute command for each routing protocol, if not set in R1's configuration?

A plan shows redistribution between two EIGRP domains. What must be done to use the source route's original component metrics?

A plan shows redistribution between two OSPF domains. What must be done to use the source route's original component metrics?

The plan shows the redistribute eigrp 2 command to redistribute from EIGRP 2 into OSPF. What other optional parameters are required to ensure redistribution of from EIGRP?

R1 has two connected interfaces in the EIGRP 2 domain and knows dozens of EIGRP routes. The plan shows the redistribute eigrp 2 subnets under an OSPF process. What else must be done to redistribute the two connected subnets inside the EIGRP domain?

Create an Implementation Plan Table

To practice skills useful when creating your own implementation plan, list in Table 9-8 configuration commands related to the configuration of the following features. You may want to record your answers outside the book and set a goal to complete this table (and others like it) from memory during your final reviews before taking the exam.

Table 9-8. Implementation Plan Configuration Memory Drill


Configuration Commands/Notes

Configuring redistribution into EIGRP from OSPF. (List all parameters you can recall.)

Configuring redistribution into EIGRP from OSPF. (List all parameters you can recall.)

Setting default metrics for all redistribute commands, redistributing into EIGRP.

Setting default metrics for all redistribute commands, redistributing into OSPF.

Choosing Commands for a Verification Plan Table

To practice skills useful when creating your own verification plan, list in Table 9-9 all commands that supply the requested information. You may want to record your answers outside the book and set a goal to complete this table (and others like it) from memory during your final reviews before taking the exam.

Table 9-9. Verification Plan Memory Drill

Information Needed


Display a brief version of the EIGRP topology table, listing external routes.

Display the EIGRP topology table, including notations identifying external routes.

For external EIGRP routes, display the source of the route, external metric, and IP address of the router that redistributed the route.

Identify external EIGRP-learned IP routes.

Display a brief version of the OSPF topology table, listing Type 5 External LSAs.

Display all OSPF Type 4 LSAs.

Display all OSPF Type 5 LSAs.

Display all OSPF Type 7 LSAs.

Display the external route type for an OSPF external route.

Display OSPF cost for each interface, briefly.

On an internal router, display any same-area ABRs' costs to reach any ASBRs.

On an internal router, display that router's best cost to reach an ASBR.

Display the metric for all currently best external OSPF routes.

Review all the Key Topics

Review the most important topics from inside the chapter, noted with the key topics icon in the outer margin of the page. Table 9-10 lists a reference of these key topics and the page numbers on which each is found.


Table 9-10. Key Topics for Chapter 9

Key Topic Element


Page Number


Requirements for redistribution in a router


Table 9-2

Parameters on the EIGRP redistribute command


Table 9-3

Commands and options to set metrics when redistributing into EIGRP



Rules from what is redistributed from an IGP


Table 9-4

Parameters on the OSPF redistribute command



Defaults of the OSPF redistribute command


Table 9-5

Commands and options to set metrics when redistributing into OSPF



Tiebreaker rules for choosing the best E2 routes



Rules for calculating the metric of an interarea E1 route


Complete the Tables and Lists from Memory

Print a copy of Appendix D, "Memory Tables," (found on the CD), or at least the section for this chapter, and complete the tables and lists from memory. Appendix E, "Memory Tables Answer Key," also on the CD, includes completed tables and lists to check your work.

Define Key Terms

Define the following key terms from this chapter, and check your answers in the glossary.

Redistribution, External route, Type 4 Summary ASBR LSA, Type 5 External LSA, Type 7 AS External LSA, External Type 1, External Type 2

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