Posts Tagged ‘ASN’

EIGRP configuration Lab having Two Routers and Both having same autonomous system number.


In this lab is have shown how to configure EIGRP in very simple way. This is the simplest method to configure EIGRP on cisco routers.


In EIGRP we tell Routers about Directly Connected Networks.


Autonomous System(AS):is a group of networks under a single administrative control.


An AS can be a ISP or a large Enterprise Organization.


IGP handles Routing Within AS(Autonomous System)


IGP Includes RIP,IGRP,EIGRP and OSPF


Note:EGP handles routing between AS.

BGP is the obly EGP.

 UNDERSTAN AUTONOMOUS SYSTEM(AS)


Autonomous System Number(ASN) is a 16bit binary number and we can represent it as 2^16 numbers which is equal to 65536.

Range of ASN 0 to 65535


0-65535 Reserved


1-64511 Internet Routing – ISP AS


64512-65534 Private Use- Private AS


EIGRP Configuration on Router R1:

 

R1(config)#router eigrp 1

R1(config-router)#network 1.0.0.0

R1(config-router)#network 2.0.0.0

R1(config-router)#exit

 

EIGRP Configuration on Router R2:

R2(config)#router eigrp 1

R2(config-router)#network 2.0.0.0

R2(config-router)#network 3.0.0.0

R2(config-router)#