Transcript ROUTE10S06L07.ppt

Lab 6-2 Debrief
Connecting an Enterprise Network to an ISP Network
© 2009 Cisco Systems, Inc. All rights reserved.
ROUTE v1.0—6-1
Lab Topology
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ROUTE v1.0—6-2
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?
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ROUTE v1.0—6-3
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?
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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
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ROUTE v1.0—6-5
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.
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ROUTE v1.0—6-6
Alternative Solutions
 IBGP process—full 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
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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 v1.0—6-8
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 v1.0—6-9
© 2009 Cisco Systems, Inc. All rights reserved.
ROUTE v1.0—6-10