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BGP routes issue

Created: Feb 26, 2020 05:33:20Latest reply: Jun 14, 2020 22:47:10 146 5 0 0
  Rewarded HiCoins: 0 (problem resolved)

Hello Gents,


we have 4 AS in below topology & all have EBGP peers with one another through physical interfaces not loopback.......& on each AS router advertise loopback address with Network command in BGP......now when check BGP table on R4 & R3 then towards R1& R2 loopback showing two paths best & other one.


but when check on R1 & R2 then showing only one best path not other one ,,,,,any one can explain this what will be the issue? below are screenshort.


BGP



Thanks

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Admin Created Feb 26, 2020 05:46:51 Helpful(0) Helpful(0)

Hi @LSA,
It's normal.
On R4, the next-hop of network 10.10.10.2/32 is 4.1.1.2 which I think is the IP address of the interface E0/0/1 on R1, what should be pointed out is BGP only add the best one into the routing table, which means only this route is added into the routing table, so on R4, it wouldn't advertise this route, which learned from R1, backto R1.
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LSA Created Feb 26, 2020 06:10:15
@chenhui thanks for reply.......as 10.10.10.1 is loopback of R1 .2 is for R2 & so on......when we check on R4 then its ok....both path showing in BGP table not routing table as in routing table we have only best route....but when check on R1 then why show one path .....you can see in above screenshort.  
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chenhui Admin Created Feb 26, 2020 05:46:51 Helpful(0) Helpful(0)

Hi @LSA,
It's normal.
On R4, the next-hop of network 10.10.10.2/32 is 4.1.1.2 which I think is the IP address of the interface E0/0/1 on R1, what should be pointed out is BGP only add the best one into the routing table, which means only this route is added into the routing table, so on R4, it wouldn't advertise this route, which learned from R1, backto R1.
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LSA Created Feb 26, 2020 06:10:15
@chenhui thanks for reply.......as 10.10.10.1 is loopback of R1 .2 is for R2 & so on......when we check on R4 then its ok....both path showing in BGP table not routing table as in routing table we have only best route....but when check on R1 then why show one path .....you can see in above screenshort.  
manishah Created Feb 26, 2020 06:17:15 Helpful(0) Helpful(0)

chen@chenhui that address 10.10.10.1 .if we talk about this. this is the ip advertised on r1 bgp as number 10. its learning from both sides . like from r1 and through the path r3, r3 and the to r1 2nd bes .. but if we look for the ip 10.10.10. 4 which is advertized on as 40 . is learnt by bgp routing table . it should show 2 paths .1 which is best .which is the direct link between 1 and 4. and the other is r1-r2-r3 to r4 .. in bgp routing table we should have these two paths . but right now its just showing one . offcource in ip routing table it will just show the best route , but in bgp routing table it should show the both paths. ?
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data%20comm%20%20engineer
estefaniesc Created Jun 14, 2020 22:47:01 Helpful(0) Helpful(0)

excellent
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estefaniesc Created Jun 14, 2020 22:47:10 Helpful(0) Helpful(0)

Great
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