I need a bit of help understanding what is going on in my topology. I really want to understand why i can ping 1.1.1.1 from r4 but not from r5 or r6. Please help and advise me. Many thanks guys
r1
router ospf 1
network 1.1.1.1 0.0.0.0 area 0
network 10.1.13.0 0.0.0.255 area 0
router bgp 65537
bgp log-neighbor-changes
network 1.1.1.1 mask 255.255.255.255
neighbor 1.1.1.3 remote-as 65537
neighbor 1.1.1.3 update-source Loopback0
r2
router ospf 1
network 1.1.1.2 0.0.0.0 area 0
network 10.1.23.0 0.0.0.255 area 0
router bgp 65537
bgp log-neighbor-changes
network 1.1.1.2 mask 255.255.255.255
neighbor 1.1.1.3 remote-as 65537
neighbor 1.1.1.3 update-source Loopback0
r3
router ospf 1
network 1.1.1.3 0.0.0.0 area 0
network 10.1.13.0 0.0.0.255 area 0
network 10.1.23.0 0.0.0.255 area 0
router bgp 65537
bgp log-neighbor-changes
network 20.1.1.0 mask 255.255.255.0
network 192.168.1.0
neighbor 1.1.1.1 remote-as 65537
neighbor 1.1.1.1 update-source Loopback0
neighbor 1.1.1.1 next-hop-self
neighbor 1.1.1.2 remote-as 65537
neighbor 1.1.1.2 update-source Loopback0
neighbor 1.1.1.2 next-hop-self
neighbor 20.1.1.4 remote-as 65538
neighbor 192.168.1.165 remote-as 65538
maximum-paths 2
r4
router eigrp 100
network 1.1.1.4 0.0.0.0
network 10.2.45.0 0.0.0.255
network 10.2.46.0 0.0.0.255
router bgp 65538
bgp log-neighbor-changes
network 20.1.1.0 mask 255.255.255.0
network 192.168.1.0
neighbor 1.1.1.5 remote-as 65538
neighbor 1.1.1.5 update-source Loopback0
neighbor 1.1.1.5 next-hop-self
neighbor 1.1.1.6 remote-as 65538
neighbor 1.1.1.6 update-source Loopback0
neighbor 1.1.1.6 next-hop-self
neighbor 20.1.1.3 remote-as 65537
neighbor 192.168.1.191 remote-as 65537
maximum-paths 2
r5
router eigrp 100
network 1.1.1.5 0.0.0.0
network 10.2.45.0 0.0.0.255
router bgp 65538
bgp log-neighbor-changes
network 1.1.1.5 mask 255.255.255.255
neighbor 1.1.1.4 remote-as 65538
neighbor 1.1.1.4 update-source Loopback0
r6
router eigrp 100
network 1.0.0.0
network 1.1.1.6 0.0.0.0
network 10.2.46.0 0.0.0.255
router bgp 65538
bgp log-neighbor-changes
network 1.1.1.6 mask 255.255.255.255
neighbor 1.1.1.4 remote-as 65538
neighbor 1.1.1.4 update-source Loopback0
r6
#show ip bgp
Network Next Hop Metric LocPrf Weight Path
*>i 1.1.1.1/32 1.1.1.4 0 100 0 65537 i
*>i 1.1.1.2/32 1.1.1.4 0 100 0 65537 i
*> 1.1.1.6/32 0.0.0.0 0 32768 i
*>i 20.1.1.0/24 1.1.1.4 0 100 0 i
*>i 192.168.1.0 1.1.1.4 0 100 0 i
and as well r4
show ip bgp sum
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
1.1.1.5 4 65538 52 54 9 0 0 00:43:20 1
1.1.1.6 4 65538 53 53 9 0 0 00:43:25 1
20.1.1.3 4 65537 54 54 9 0 0 00:43:20 4
192.168.1.191 4 65537 56 53 9 0 0 00:43:17 4
show ip bgp
Network Next Hop Metric LocPrf Weight Path
*m 1.1.1.1/32 192.168.1.191 0 65537 i
*> 20.1.1.3 0 65537 i
*m 1.1.1.2/32 192.168.1.191 0 65537 i
*> 20.1.1.3 0 65537 i
r>i 1.1.1.5/32 1.1.1.5 0 100 0 i
r>i 1.1.1.6/32 1.1.1.6 0 100 0 i
* 20.1.1.0/24 20.1.1.3 0 0 65537 i
* 192.168.1.191 0 0 65537 i
*> 0.0.0.0 0 32768 i
* 192.168.1.0 20.1.1.3 0 0 65537 i
* 192.168.1.191 0 0 65537 i
*> 0.0.0.0 0 32768 i
a ping from r4 to r1 or r2 is successful but from r5 or r6 is not.