Network Expert's Border Gateway Protocol(BGP)

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

Monitoring and Troubleshooting BGP

  • Given a configured BGP network, verify proper operation and perform the steps necessary to correct basic BGP configuration errors

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

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

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

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

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

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

Scaling IGP and BGP in Service Provider Networks

Common Routing Issues in Service Provider Networks

  • Describe common routing concerns of service provider networks

Optical Networking Designs

  • Describe the scalability issues of using OSPF and IS-IS as interior gateway protocols in a service provider network and list solutions for each

Scaling BGP in Service Provider Networks

  • Describe common scalability issues when using BGP in a service provider network and list solutions for each

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