BGP: Configuring BGP on Cisco Routers

• Completion of Interconnecting Cisco Networking Devices (ICND1) or Cisco Certified Networking Associate (CCNA)

Upon completion of the course, students should be able to:

• 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
• Use BGP attributes to influence the route selection process in a network scenario where you must support multiple connections
• Implement the correct BGP configuration to successfully connect the customer network to the Internet in a network scenario where you must support multiple connections
• Enable the provider network to behave as a transit autonomous system in a typical service provider network with multiple BGP connections to other autonomous systems
• Identify common BGP scaling issues and enable route reflection and confederations as possible solutions to these issues in a typical service provider network with multiple BGP connections to other autonomous systems

• Internet service providers
• Networking professionals who need to connect to ISPs
• CCIP and CCIE certification candidates

1. BGP Overview

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

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

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

4. Route Selection Using Attributes

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

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

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

7. Optimizing BGP Scalability

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

 
Labs
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 neighbour
• 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 behaviour
• 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 neighbour
• 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 neighbouring 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