Configuring BGP on Cisco Routers 4.0

Course Objectives

Upon completing this course, the learner will be able to meet these overall objectives:

• Implement the correct BGP configuration to allow your network to act as an ISP
• Configure BGP with multiple BGP connections to other autonomous systems
• Configure a provider network to behave as a transit autonomous system (AS)
• Configure, monitor, and troubleshoot basic BGP to enable inter-domain routing in a network scenario with multiple domains
• Use BGP policy controls to influence the route selection process with minimal impact on BGP route processing in a network scenario where you must support connections to multiple ISPs
• Configure BGP to connect the customer network to the Internet when multiple connections must be implemented
• Enable route reflection and confederations as possible solutions to BGP scaling issues
• Optimize the scalability of the BGP routing protocol in a typical network

Prerequisites

The knowledge and skills the learner should have before attennding this course are as follows:

• ROUTE - Implementing Cisco IP Routing v2.0

Outline

Module 1: BGP Overview

• Session Establishment
• Path Attributes
• Route Processing
• Basic Configuration
• Monitoring and Troubleshooting

Module 2: BGP Transit Autonomous Systems

• Working with a Transit AS
• Interacting with IBGP and EBGP in a Transit AS
• Forwarding Packets in a Transit AS
• Configuring a Transit AS
• Monitoring and Troubleshooting IBGP in a Transit AS

Module 3: Route Selection Using Policy Controls

• Multihomed BGP Networks
• Employing AS Path Filters
• Filtering with Prefix Lists
• Outbound Route Filtering
• Applying Route Maps as BGP Filters
• Implementing Changes in BGP Policy

Module 4: Route Selection Using Attributes

• BGP Route Selection with Weights
• BGP Local Preference
• AS-Path Prepending
• BGP Multi-Exit Discriminator (MED)
• Addressing BGP Communities

Module 5: Customer-to-Provider Connectivity with BGP

• Customer-to-Provider Connectivity Requirements
• Implementing Customer Connectivity Using Static Routes
• Connecting a Multihomed Customer to Single or Multiple Service Providers

Module 6: Scaling Service Provider Networks

• Scaling IGP and BGP in Service Provider Networks
• Designing Networks and Route Reflectors
• Configuring and Monitoring Route Reflectors
• Configuring and Monitoring Confederations

Module 7: Optimizing BGP Scalability

• Improving BGP Convergence
• Limiting the Number of Prefixes Received from a BGP Neighbor
• Implementing BGP Peer Groups
• BGP Route Dampening

Lab Outline

• Lab 1: Configuring basic BGP
  • Create BGP peerings
  • Advertise networks into BGP
  • Redistribute your IGP into BGP
  • Examine the effects of BGP auto-summarization
  • Summarize routes to your neighbor
  • Implement BGP TTL Security
  • Implement BGP Authentication
• Lab 2: Configuring IBGP Peerings
  • Configure an IBGP peering with another edge router
  • Peering with loopback interfaces
  • Examine effect of BGP synchronization
  • Discover BGP next-hop behavior
  • Examine the effects of multihoming on path selection
• Lab 3: Using AS-Path Filters and Regular Expressions
  • Filter updates to external routers
  • Manipulate path selection using AS-path filters and regular expressions
• Lab 4: Using Prefix Lists
  • Filter advertised AS routes using prefix lists
  • Implement Outbound Route Filtering
• Lab 5: Configure Route Maps for BGP Filtering
  • Configure a route map as a BGP filter
• Lab 6: Configuring the Weight Attribute
  • Configure a second BGP peering for each router
  • Set a weight value for routes received from each EBGP neighbor
  • Monitor the resulting path choice
• Lab 7: Configuring the Local Preference Attribute
  • Use the Local Preference attribute to control BGP path selection
• Lab 8: AS-Path Prepending
  • Configure AS-Path Prepending to make one path into your AS look more attractive than the other
• Lab 9: Configuring the Multi-Exit Discriminator (MED) Attribute
  • Use the MED attribute to influence the BGP path selection by routers in neighboring systems
• Lab 10: Using the Community Attribute
  • Configure the community attribute in setting local preference BGP policies
• Lab 11: Using Route Reflectors
  • Configure a hierarchical route reflector structure
  • Examine the effects of route reflectors on routing updates
• Lab 12: Monitoring and Tuning BGP Resource Use
  • Examine the effects of BGP session establishment and route updates on router resources
  • Examine how timers speed BGP convergence
  • Set a maximum prefix value
• Lab 13: Using Peer Groups
  • Place neighboring BGP routers into peer groups
  • Apply policy configuration to peer groups
• Lab 14: Using Route Dampening
  • Configure and apply route dampening to external peers
  • Monitor the results when that peer's routes flap
• Lab 15: Implement BGP for IPv6 (Optional)
  • Configure BGP to support IPv6