Loopback not pinging

[himanshudwivedi]

Please check the network diagram. I have configured BGP on all the routers are R1 and R3 & R3 and R4 are the neighbor of each other.

Configured Loopback in all the routers and advertise in BGP. When I am executing command sh ip bgp , getting Routes to R1 loopback, but I am unable to ping the loopback ip. Please help me.

Below is the output

[Georg Pauwen · Accepted solution]

Hello,

post the full running configs of all three routers. Are you peering with the loopbacks or with the physical interface addresses ?

The below configs would be an option to have full reachability:

R1

interface Loopback0
ip address 1.1.1.1 255.255.255.255
!
interface GigabitEthernet0/0
description Link to R3
ip address 20.0.0.1 255.255.255.252
duplex auto
speed auto
media-type rj45
!
router bgp 1
bgp router-id 1.1.1.1
bgp log-neighbor-changes
network 1.1.1.1 mask 255.255.255.255
network 20.0.0.0 mask 255.255.255.252
neighbor 2.2.2.2 remote-as 2
neighbor 2.2.2.2 ebgp-multihop 2
neighbor 2.2.2.2 update-source Loopback0
!
ip route 2.2.2.2 255.255.255.255 20.0.0.2

R3

interface Loopback0
ip address 2.2.2.2 255.255.255.255
!
interface GigabitEthernet0/0
description Link to R1
ip address 20.0.0.2 255.255.255.252
duplex auto
speed auto
media-type rj45
!
interface GigabitEthernet0/1
description Link to R4
ip address 30.0.0.2 255.255.255.252
duplex auto
speed auto
media-type rj45
!
router bgp 2
bgp router-id 2.2.2.2
bgp log-neighbor-changes
network 2.2.2.2 mask 255.255.255.255
network 20.0.0.0 mask 255.255.255.252
network 30.0.0.0 mask 255.255.255.252
neighbor 1.1.1.1 remote-as 1
neighbor 1.1.1.1 ebgp-multihop 2
neighbor 1.1.1.1 update-source Loopback0
neighbor 3.3.3.3 remote-as 3
neighbor 3.3.3.3 ebgp-multihop 2
neighbor 3.3.3.3 update-source Loopback0
!
ip route 1.1.1.1 255.255.255.255 20.0.0.1
ip route 3.3.3.3 255.255.255.255 30.0.0.1

R4

interface Loopback0
ip address 3.3.3.3 255.255.255.255
!
interface GigabitEthernet0/1
description Link to R3
ip address 30.0.0.1 255.255.255.252
duplex auto
speed auto
media-type rj45
!
router bgp 3
bgp router-id 3.3.3.3
bgp log-neighbor-changes
network 3.3.3.3 mask 255.255.255.255
network 30.0.0.0 mask 255.255.255.252
neighbor 2.2.2.2 remote-as 2
neighbor 2.2.2.2 ebgp-multihop 2
neighbor 2.2.2.2 update-source Loopback0
!
ip route 2.2.2.2 255.255.255.255 30.0.0.2

[himanshudwivedi]

All the configuration are attached... I am peering with Serial Interfaces...

[himanshudwivedi]

It worked , I thank you for your support

[paul driver · Accepted solution]

Hello

Apply the following and test again.

R1
router bgp 1
no network 1.1.1.1

R3
router bgp 2
network 20.0.0.0 mask 255.255.255.252
network 30.0.0.0 mask 255.255.255.252

[himanshudwivedi]

Yes, it worked for me.. Thank You sir for your support..