IBGP doesn't work

[rcpoemrvt]

I want that R5 knows a route to the subnet 192.168.8.0.

Configuration of R1:

interface Loopback0
 ip address 192.168.100.1 255.255.255.0
!
interface FastEthernet0/0
 ip address 192.168.8.1 255.255.255.0
 duplex auto
 speed auto
!
interface FastEthernet1/0
 ip address 192.168.2.1 255.255.255.0
 duplex auto
 speed auto
!
router bgp 100
 no synchronization
 bgp log-neighbor-changes
 network 192.168.2.0
 network 192.168.8.0
 neighbor 192.168.8.2 remote-as 200
 neighbor 192.168.100.5 remote-as 100
 neighbor 192.168.100.5 update-source Loopback0
 no auto-summary
!

Configuration of R4:

interface Loopback0
 ip address 192.168.100.4 255.255.255.0
!
interface FastEthernet1/0
 ip address 192.168.8.2 255.255.255.0
 duplex auto
 speed auto
!
router bgp 200
 no synchronization
 bgp log-neighbor-changes
 network 192.168.8.0
 neighbor 192.168.8.1 remote-as 100
 no auto-summary
!

Configuration of R5:

!
interface Loopback0
 ip address 192.168.100.5 255.255.255.0
!
interface FastEthernet0/0
 ip address 192.168.2.2 255.255.255.0
 duplex auto
 speed auto
!
router bgp 100
 no synchronization
 bgp log-neighbor-changes
 network 192.168.2.0
 neighbor 192.168.100.1 remote-as 100
 neighbor 192.168.100.1 update-source Loopback0
 no auto-summary
!

[Pedro Lereno · Accepted solution]

Hi,

Change all loopbacks to a /32, you have created all on the same /24 network.

Create static routes on R1 and R5 to reach both loopbacks addresses.

Example

R1:

interface Loopback0
 ip address 192.168.100.1 255.255.255.255   

ip route 192.168.100.5 255.255.255.255 192.168.2.2

R5:

!
interface Loopback0
 ip address 192.168.100.5 255.255.255.255

ip route 192.168.100.1 255.255.255.255 192.168.2.1

Best Regards,

Pedro Lereno

[rcpoemrvt]

Thank you very much!

Is it possible to make it without static routes so it will be more dynamically?

[Pedro Lereno]

Hi,

Yes, it is possible.

R1 and R5 are iBGP neighbors you can add an IGP (interior gateway protocol: RIP, EIGRP, OSPF or IS-IS) between them to announce theirs loopbacks.

Example for eigrp:

R1:

router eigrp 1
network 192.168.100.1 0.0.0.0
network 192.168.2.0 0.0.0.255   

R5:

router eigrp 1
network 192.168.100.5 0.0.0.0
network 192.168.2.0 0.0.0.255  

do not forget to remove the static routes.

Best Regards,

Pedro Lereno