BGP Overview

Introduction to BGP

*Given a network scenario, identify appropriate BGP usage and its limitations BGP Session Establishment
*Given a typical BGP network scenario, describe the concept of BGP neighbors and the neighbor session establishment procedures BGP Route Processing
*Given a diagram of an operational BGP network, describe interdomain route processing, route propagation and BGP path selection Basic BGP Configuration
*Given a network consisting of multiple domains, successfully configure BGP II. Route Selection Using Policy Controls

Multi-Homed BGP Networks

*Given a customer scenario where connections to multiple ISPs must be supported, describe the need for influencing BGP route selection AS-Path Filters
*Given a customer scenario where connections to multiple ISPs must be supported, successfully configure BGP to influence route selection using AS path filters

Prefix-List Filters
*Given a customer scenario where connections to multiple ISPs must be supported, successfully configure BGP to influence route selection using prefix-list filters

Outbound Route Filtering
*Given an operational BGP network, use outbound route filtering to minimize the impact of BGP routing updates on router resources Route-Maps as BGP Filters
*Given a typical BGP network, correctly configure BGP to influence route selection using route maps Implementing Changes in BGP Policy
*Given a typical BGP network, configure the route-refresh feature to minimize the impact of expediting BGP policy updates

III. Route Selection Using Attributes

BGP Path Attributes *List BGP path attributes and functionality of each attribute Influencing BGP Route Selection with Weights
*Given a customer scenario where multiple connections must be supported, successfully configure BGP to influence route selection using the weight attribute BGP Local Preference
*Given a customer scenario where multiple connections must be supported, successfully configure BGP to influence route selection using the local preference attribute BGP Multi-Exit-Discriminator (MED)
*Given a customer scenario where multiple connections must be supported, successfully configure BGP to influence route selection using the Multi-Exit-Discriminator (MED) attribute BGP Communities
*Given a customer scenario where multiple connections must be supported, successfully configure BGP to influence route selection using BGP community attributes

IV. Customer-to-Provider Connectivity with BGP

Customer Connectivity Requirements

*Describe the requirements to connect customer networks to the Internet in a service provider environment Static Routing Toward the Customer
*Given a service provider network, implement customer connectivity using static routing BGP Customer Multi-Homed to a Single Service Provider
*Given a customer scenario where multiple connections to a single ISP must be supported, implement customer connectivity with BGP
BGP Customer Multi-Homed to Multiple Service Providers

*Given a customer scenario where connections to multiple ISPs must be supported, implement customer connectivity with BGP

V. BGP Transit Autonomous System Transit Autonomous System Functions

*Describe the function of a transit autonomous system and the need for IBGP IBGP and EBGP Interaction in a Transit AS
*Given a transit autonomous system, describe the interaction between EBGP and IBGP in relation to relevant BGP attributes Packet Forwarding in Transit Autonomous Systems
*Describe the function of an IGP in forwarding packets through an autonomous system Configuring a Transit Autonomous System
*Given a BGP network scenario, successfully configure an autonomous system to act as a transit backbone Monitoring and Troubleshooting IBGP in Transit AS
*Given a configured BGP transit network, verify proper operation and perform the steps necessary to correct basic IBGP configuration errors

VI. BGP Route Reflectors

Introduction to Route Reflectors

*Describe the function and operation of route reflectors in a BGP environment Network Design with Route Reflectors
*Based upon established route reflector design rules, describe the concept of hierarchial route reflectors and their requirements

Configuring and Monitoring Route Reflectors

*Given an existing IBGP network, configure and verify proper operation of route reflectors to modify IBGGP split-horizon rules

VII. Advanced BGP Configuration

Limiting the Number of Prefixes Received from a BGP Neighbor
*Given a typical BGP network, successfully configure BGP to limit the number of prefixes received from a neighbor AS-Path Prepending

*Given a typical service provider network with connections to multiple autonomous systems, use AS-Path prepending to influence the return path selected by the neighboring autonomous systems BGP Peer Group

*Given a typical BGP network, use BGP peer groups to share common configuration parameters between multiple BGP peers BGP Route Flap Dampening

*Given a properly configured BGP network, use route flap dampening to minimize the impact of unstable routes Back to top