2009 Cisco Systems, Inc. All rights reserved. ROUTE v1.06-1 Connecting an Enterprise Network to an ISP Network Lab 6-2 Debrief 2009 Cisco Systems, Inc. All rights reserved. ROUTE v1.06-2 Lab Topology 2009 Cisco Systems, Inc. All rights reserved. ROUTE v1.06-3 Lab Review: What did you accomplish? Task 1: Configure fully meshed IBGP What steps did you take to configure fully meshed IBGP? How did you deal with loopback interfaces? Task 2: Use the MED and local preference (LP) with route maps for BGP path manipulation What is the difference between a MED and an LP implementation? In what order did you execute your plan and why? How did you apply a new policy to the BGP neighbor? 2009 Cisco Systems, Inc. All rights reserved. ROUTE v1.06-4 Verification Is your solution working? What method did you follow to verify that BGP path manipulation is working correctly? Which commands did you use to verify the proper operation of different BGP policies? 2009 Cisco Systems, Inc. All rights reserved. ROUTE v1.06-5 Check Points Full-mesh BGP Check IP routing table Loopbacks and next hop Path used to reach the remote networks Why a different path is used Soft reconfiguration 2009 Cisco Systems, Inc. All rights reserved. ROUTE v1.06-6 Sample Solution Configure full-mesh IBGP. Use loopbacks for BGP sessions. Advertise loopbacks and next hop. Disable synchronization. Manipulate the path using MED and LP. Perform a soft reconfiguration. 2009 Cisco Systems, Inc. All rights reserved. ROUTE v1.06-7 Alternative Solutions IBGP processfull mesh or partial mesh Use loopbacks or other interfaces for BGP session Install routes into the IP routing table or advertise next hop BGP synchronization ON or OFF Using other BGP attributes (beside MED or LP) for path manipulation How to trigger an update of BGP table after policy change 2009 Cisco Systems, Inc. All rights reserved. ROUTE v1.06-8 Q and A What is the advantage of full-mesh IBGP? Why is the next hop IP address important? When is synchronization needed? What are different reconfiguration options? What is the difference between MED and LP? 2009 Cisco Systems, Inc. All rights reserved. ROUTE v1.06-9 Summary Create a good implementation plan and define the BGP requirements before configuring a BGP path manipulation. Several solutions exist and alternative solutions give similar or very different results. 2009 Cisco Systems, Inc. All rights reserved. ROUTE v1.06-10