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Configuracion iBGP y eBGP con y sin Loopback

15:24:00
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iBGP Configuration

In this configuration, both routers are in AS 400.


R1#
!-- Output suppressed.

interface Serial1
 ip address 10.10.10.1 255.255.255.0
!
router bgp 400

!--- Enables BGP for the autonomous !--- system 400.

 neighbor 10.10.10.2 remote-as 400
 
!--- Specifies a neighbor 10.10.10.2 !--- in the remote AS 400, making 
!--- this an iBGP connection. !-- Output suppressed.

end




R2#
!-- Output suppressed.

interface Serial0
ip address 10.10.10.2 255.255.255.0
!
router bgp 400
 neighbor 10.10.10.1 remote-as 400

!-- Output suppressed.

end

eBGP Configuration

In this configuration, the router R1 is in AS 300 and R2 is in AS 400.



R1#
Current configuration:

!-- Output suppressed

interface Serial1
 ip address 10.10.10.1 255.255.255.0
!
router bgp 300

!--- Enables BGP for the autonomous !--- system 300.

 neighbor 10.10.10.2 remote-as 400
 
!--- Specifies a neighbor 10.10.10.2 !--- in the remote AS 400, making !
--- this an eBGP connection.


!-- Output suppressed.

end




R2#
Current configuration:

!-- Output suppressed.

interface Serial0
ip address 10.10.10.2 255.255.255.0
!
router bgp 400
 neighbor 10.10.10.1 remote-as 300

!-- Output suppressed.

end


iBGP Configuration with a Loopback Address

You can configure iBGP using a loopback address (or any other operational interface) as shown in this section.
R1
Current configuration:


!-- Output suppressed.

interface Loopback0
  ip address 1.1.1.1 255.255.255.255
 !
 interface Serial1
  ip address 10.10.10.1 255.255.255.0
 !
 router bgp 300
  neighbor 2.2.2.2 remote-as 300
  neighbor 2.2.2.2 update-source Loopback0
  
!--- This command specifies that the TCP 
!--- connection with the specified external !
--- peer should be established using the 
!--- address on the loopback interface.

 !
 ip route 2.2.2.2 255.255.255.255 10.10.10.2
 
!--- This static route ensures that the 
!--- remote peer address used for peering 
!--- is reachable. !-- Output suppressed.

end




R2#
!Current configuration:


!-- Output suppressed.

interface Loopback0
 ip address 2.2.2.2 255.255.255.255
!
interface Serial0
 ip address 10.10.10.2 255.255.255.0
!
router bgp 300
 neighbor 1.1.1.1 remote-as 300
 neighbor 1.1.1.1 update-source Loopback0
!
ip route 1.1.1.1 255.255.255.255 10.10.10.1

!-- Output suppressed.

end

eBGP Configuration with a Loopback Address


R2#

Current configuration:
!-- Output suppressed.
interface Loopback0
  ip address 1.1.1.1 255.255.255.255
 !
 interface Serial1
  ip address 10.10.10.1 255.255.255.0
 !
 router bgp 300
  neighbor 2.2.2.2 remote-as 400
  neighbor 2.2.2.2 ebgp-multihop 2
 
 !--- This command changes the ttl value in 

!--- order to allow the packet to reach the 

!--- external BGP peer which is not directly 

!--- connected or is using an interface other 

!--- than the directly connected interface.

neighbor 2.2.2.2 update-source Loopback0
  
!--- This command specifies that the TCP 

!--- connection with the external BGP 

!--- peer should be established using the 

!--- address on the loopback interface. !
 ip route 2.2.2.2 255.255.255.255 10.10.10.2
 !--- This static route ensures that the 

!--- remote peer address used for peering 

!--- is reachable. !-- Output suppressed.end




R2#
Current configuration:


!-- Output suppressed.


interface Loopback0
 ip address 2.2.2.2 255.255.255.255
!
interface Serial0
 ip address 10.10.10.2 255.255.255.0
!
router bgp 400
 neighbor 1.1.1.1 remote-as 300
 neighbor 1.1.1.1 ebgp-multihop 2
 neighbor 1.1.1.1 update-source Loopback0
!
ip route 1.1.1.1 255.255.255.255 10.10.10.1


!-- Output suppressed.

end


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