eBGP is an exterior gateway protocol used to exchange routing information between different autonomous systems (AS) on the Internet. It uses TCP port 179. The document provides an overview of eBGP and describes a basic eBGP configuration between a customer and ISP to exchange routes, including verifying the configuration.

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4- eBGP
4.1 eBGP Overview And Basic Configuration

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4.1 eBGP Overview And Basic Configuration

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BGP
• Border Gateway Protocol
• Exterior gateway protocol designed to
exchange routing and reachability
information among autonomous systems
(AS) on the Internet
• Port number : 179
• eBGP : Used between different AS
iBGP : Used in same AS

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BGPOPTIONS
• Default Route Only : ISPs advertise a default route to customer
• Default Route & ISP Routes : ISPs advertise a default route and
their own networks to customer
• All Internet Routes : ISPs advertise all internet routes to
customers so that customer can make the best choice but this
requires a huge resource

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eBGP
• Used to Exchange routes between routers which are in diferent
Autonomous System

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BASICeBGPCONFIGURATION
CUSTOMER
eBGP
AS 65003 AS 65004
201.23.11.0/24 Gig 0/1
Gig 0/1
ISP
198.176.21.1/30 198.176.21.2/30
Gig 0/0 Gig 0/0

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VERIFYINGeBGPCONFIGURATION
CUSTOMER
eBGP
AS 65003 AS 65004
201.23.11.0/24 Gig 0/1
Gig 0/1
ISP
198.176.21.1/30 198.176.21.2/30
Gig 0/0 Gig 0/0

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VERIFYINGeBGPCONFIGURATION
CUSTOMER
eBGP
AS 65003 AS 65004
201.23.11.0/24 Gig 0/1
Gig 0/1
ISP
198.176.21.1/30 198.176.21.2/30
Gig 0/0 Gig 0/0

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BONUSSLIDE( PROMOTIONOFFER!)
• To get our CCNA 200-125 Full Video Training with %90 discount
click the link below now !
CCNA 200-125 VIDEO TRAINING (GET WITH %90 DISCOUNT)

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VERIFYINGeBGPCONFIGURATION
CUSTOMER
eBGP
AS 65003 AS 65004
201.23.11.0/24 Gig 0/1
Gig 0/1
ISP
198.176.21.1/30 198.176.21.2/30
Gig 0/0 Gig 0/0