Lab 2-2 Debrief
Implementing an EIGRP-Based Solution
© 2009 Cisco Systems, Inc. All rights reserved.
ROUTE v1.0—2-1
Lab Topology
© 2009 Cisco Systems, Inc. All rights reserved.
ROUTE v1.0—2-2
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—2-3
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—2-4
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—2-5
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—2-6
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—2-7
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—2-8
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—2-9
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—2-10
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—2-11
© 2009 Cisco Systems, Inc. All rights reserved.
ROUTE v1.0—2-12