© 2009 Cisco Systems, Inc. All rights reserved. ROUTE v1.0—2-1 Implementing an EIGRP-Based Solution Lab 2-2 Debrief

© 2009 Cisco Systems, Inc. All rights reserved. ROUTE v1.0—2-2 Lab Topology

© 2009 Cisco Systems, Inc. All rights reserved. ROUTE v1.0—2-3 Lab Review: What Did You Accomplish?  Task 1: Configure EIGRP over point-to-point WAN interfaces –What steps did you take to configure the EIGRP routing protocol on point-to-point WAN interfaces? –How do you automatically configure EIGRP to advertise any additional network that is added to the router? –Can a secondary IP address be added to the router?  Task 2: Configure EIGRP over a multipoint WAN interface –What steps did you take to configure the EIGRP routing protocol on multipoint WAN interfaces?

© 2009 Cisco Systems, Inc. All rights reserved. ROUTE v1.0—2-4 Lab Review: What Did You Accomplish? (Cont.)  Task 3: Adjusting EIGRP operation over a multipoint WAN interface –What is an EIGRP split horizon? –How can an EIGRP split horizon behavior be changed on a WAN multipoint interface?  Task 4—Deploying EIGRP unequal-cost path load balancing –What do you use to manipulate the path in an EIGRP routing protocol? –How can you perform path manipulation without using path control tools?

© 2009 Cisco Systems, Inc. All rights reserved. ROUTE v1.0—2-5 Verification  Did you have enough information to create the implementation plan?  Do EIGRP-enabled routers form adjacencies on point-to-point and multipoint links after EIGRP is configured?  Do you see all of the EIGRP-advertised networks in the IP routing table as EIGRP routes (after point-to-point and after multipoint configuration respectively)?  What are the changes when split horizon is disabled on the interface?  What is changed to manipulate the path of the packets and what must be implemented to perform unequal-cost load balancing?

© 2009 Cisco Systems, Inc. All rights reserved. ROUTE v1.0—2-6 Checkpoints  Configure EIGRP routing protocol on point-to-point interfaces.  Automatically advertise any additional network that is added to the router.  Ensure EIGRP networks are present in the IP routing table.  Configure EIGRP routing protocol on multipoint interfaces.  Ensure new EIGRP networks are present in the IP routing table.  Simulate a connectivity failure between routers R3 and R4 and examine the EIGRP operation afterwards.

© 2009 Cisco Systems, Inc. All rights reserved. ROUTE v1.0—2-7 Checkpoints (Cont.)  Change the EIGRP split horizon behavior on the WAN multipoint interface  Adjust the metric to manipulate load balancing.  Simulate a connectivity failure between routers R1 and R3 and examine the EIGRP operation afterwards.  Change the EIGRP metric to manipulate unequal-cost path load balancing.  Verify connectivity.

© 2009 Cisco Systems, Inc. All rights reserved. ROUTE v1.0—2-8 A Sample Solution  EIGRP is configured on point-to-point and multipoint interfaces.  All of the specific IP subnets used in the network are advertised, as well as all new networks added later.  Split horizon is disabled, and the metric is changed in order to provide load balancing and unequal-cost path load-balancing.

© 2009 Cisco Systems, Inc. All rights reserved. ROUTE v1.0—2-9 Alternative Solutions  A different metric and administrative distance can be applied as well as filtering or static routes can be used in a few segments of the EIGRP network.  EIGRP-specific functionalities do not have many alternative solutions; while another routing protocol can be used, this is not a realistic solution.

© 2009 Cisco Systems, Inc. All rights reserved. ROUTE v1.0—2-10 Q and A  Why is the selection of a routing protocol important?  What is the difference between point-to-point and multipoint interfaces when configuring an EIGRP?  Why is changing the metric important?  How does split horizon work?

© 2009 Cisco Systems, Inc. All rights reserved. ROUTE v1.0—2-11 Summary  Configure EIGRP on point-to-point interfaces and advertise all of the specific IP subnets in the network; you should also provide automatic advertising of any additional network that is added to the router.  Configure EIGRP on the multipoint interfaces and advertise all of the specific IP subnets in the network; you should also provide automatic advertising of any additional network that is added to the router.  Manipulate the EIGRP configuration on the multipoint interface by disabling split horizon.  Change the metric in order to deploy unequal-cost path load balancing.

© 2009 Cisco Systems, Inc. All rights reserved. ROUTE v1.0—2-12