Table of Contents
Border Gateway Protocol (BGP4)
Border Gateway Protocol (BGP)
Border Gateway Protocol (BGP)...
Routing/Forwarding Basics
IP routing
IP routing
IP routing
IP route lookup:Longest match routing
IP route lookup: Longest match routing
IP route lookup: Longest match routing
IP route lookup: Longest match routing
IP route lookup: Longest match routing
IP route lookup: Longest match routing
Dynamic Routing
Forwarding Table/FIB
Building Blocks
Building Blocks
Autonomous System (AS)
Autonomous System(AS)...
PPT Slide
Egress Traffic
Ingress Traffic
Types of Routes
What is Policy?
Why Do We Need an EGP?
Interior vs. Exterior Routing Protocols
Hierarchy of Routing Protocols
Demilitarized Zone (DMZ)
Addressing - ISP
BGP Basics
Protocol Basics
Protocol Basics
Terminology
Terminology
PPT Slide
BGP Peers
BGP Peers
BGP Peers
Configuring BGP Peers
Configuring BGP Peers
Configuring BGP Peers
Configuring BGP Peers
Configuring BGP Peers
Configuring BGP Peers
Configuring BGP Peers
BGP Update Messages
BGP Updates — NLRI
BGP Updates — Attributes
AS-Path Attribute
Next Hop Attribute
Next Hop Attribute
Next Hop Attribute
Next Hop Attribute (more)
BGP Updates — Withdrawn Routes
BGP Updates — Withdrawn Routes
BGP Routing Information Base
BGP Routing Information Base
BGP Routing Information Base
BGP Routing Information Base
BGP Routing Information Base
BGP Routing Information Base
An Example…
Configuring BGP
Basic BGP commands
Inserting prefixes into BGP
Originating routes...
Inserting prefixes into BGP - redistribute static
Inserting prefixes into BGP - redistribute static
Inserting prefixes into BGP - network command
Inserting routes into BGP - aggregates and Null0
PPT Slide
Policy Control - Prefix Lists
Prefix Lists - Examples
Prefix Lists - More Examples
Policy Control - Using Prefix Lists
Exercise 1 - Configuring BGP
PPT Slide
Exercise 2 - Configuring eBGP and iBGP
PPT Slide
PPT Slide
PPT Slide
BGP4 continued...
BGP Path Attributes: Why ?
BGP Path Attributes...
AS-PATH
AS-Path
Next-Hop
Third Party Next Hop
Next Hop...
PPT Slide
Local Preference
PPT Slide
Multi-Exit Discriminator (MED)
Origin
Communities
PPT Slide
Weight
Administrative Distance
Synchronization
Synchronization
BGP Route Selection (bestpath) Only one path as the bestpath !
BGP Route Selection ...
BGP Route Selection...
Routing Policy - Prefix Lists, Route Maps and Distribute Lists
PPT Slide
Policy Control - Prefix Lists
Prefix Lists - Examples
Prefix Lists - More Examples
Policy Control - Using Prefix Lists
Distribute list - using IP access lists
Filter list rules Regular Expressions
Filter list - using as-path access list
Route Maps
Route-map match & set clauses Match Clauses Set Clauses
PPT Slide
BGP and Network Design
PPT Slide
Stub AS
PPT Slide
Multi-homed AS
PPT Slide
Common Service Provider Network
Load-sharing - single path
Load Sharing - Multiple paths from the same AS
Redundancy - Multi-homing
Default from all providers
Default from all providers
Customer + default from all providers
Customer routes from all providers
Full routes from all providers
Full routes from all providers
Best Practices IGP in Backbone
Best Practices... Connecting to a customer
Best Practices... Connecting to other ISPs
Best Practices... The Internet Exchange
Exercise 3 - Connecting to an ISP
PPT Slide
Exercise 4 - Changing BGP Policy
Q & A
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