Introduction to the Border Gateway Protocol (BGP)

2/9/97


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Table of Contents

Introduction to the Border Gateway Protocol (BGP)

BGP

BGP version 4

Border Gateway Protocol (BGP)

Introduction

BGP Between AS’s

PPT Slide

When should I use BGP?

Multi-Homed AS

BGP is not needed...

PPT Slide

BGP Attributes

What Is an Attribute?

BGP Attributes—AS Path

AS-Path

BGP Attributes—Next Hop

eBGP and Next Hop

BGP Attributes—Next Hop (Cont.)

iBGP and Next Hop

BGP Attributes—Next Hop (Cont.)

BGP Attributes—Local Preference

Local Preference

Multi-Exit Discriminator (MED)

Multi-Exit Discriminator

Applying Policy with BGP

Communities

Community Attribute

Community attribute (cont.)

BGP Communities

Load Balancing

BGP Load Balancing Problem

eBGP Multihop

BGP Multipath

Difficulties in Load Balancing

Internal BGP (iBGP)

PPT Slide

iBGP

Scaling the iBGP mesh

BGP Confederations

BGP Confederation

BGP Route Reflectors (RR)

Route Reflectors

Asymmetric Routing Paradigm

Asymmetric Routing

Achieving stability

Stable iBGP Peering

Peering to Loop-Back Address

Relationship with IGP

Peer Groups

Route Flap Dampening

Route Flap Dampening (Cont.)

Flap Dampening: Terminology

Route Flap Dampening

Flap Dampening: Operation

Flap Dampening: Operation (Cont.)

BGP soft reconfig

Cisco IOS™ Version Information

Summary

Questions?

Author: Paul Ferguson

Email: pferguso@cisco.com

Return to: http://www.academ.com/nanog/feb1997