CCNA eBGP Protocol

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4- eBGP

4.1 eBGP Overview And Basic Configuration


4.1 eBGP Overview And Basic Configuration


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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BGP OPTIONS

• 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


eBGP

• Used to Exchange routes between routers which are in diferent

Autonomous System


BASIC eBGP CONFIGURATION

CUSTOMEReBGP

AS 65003 AS 65004

201.23.11.0/24 Gig 0/1

Gig 0/1

ISP

198.176.21.1/30 198.176.21.2/30Gig 0/0 Gig 0/0


VERIFYING eBGP CONFIGURATION

CUSTOMEReBGP

AS 65003 AS 65004

201.23.11.0/24 Gig 0/1

Gig 0/1

ISP

198.176.21.1/30 198.176.21.2/30Gig 0/0 Gig 0/0


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VERIFYING eBGP CONFIGURATION

CUSTOMEReBGP

AS 65003 AS 65004

201.23.11.0/24 Gig 0/1

Gig 0/1

ISP

198.176.21.1/30 198.176.21.2/30Gig 0/0 Gig 0/0

CCNA eBGP Protocol

Technology

Transcript of CCNA eBGP Protocol