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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

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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.

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  • 1
    Please do not use public IP addresses that you do not own, not even in an example. Also, add the used addresses to your diagram as we can currently only guess what's where.
    – Zac67
    May 23 at 7:14
  • Include show bgp from R 3
    – Ron Trunk
    May 23 at 10:49
  • You never redistribute between OSPF and BGP, and between EIGRP and BGP, so eBGP cannot advertise those prefixes between R3 and R4.
    – Ron Maupin
    May 23 at 12:30
  • why are you running two dynamic routing protocols on each router in your network? May 23 at 17:16

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