I hope you won’t mind it I have this question. If you may explain it
Actually I tired that solution last night but failed, I tried again & still no success. Than I thought it is must be something wrong between R1 & R2.
I enable debug on R4 & ping from R1 & the echo was not even reaching in R4 from R1. Next I ping from R2 to R4 with source loop 1 which was successful. Next Ping R2 to R4 with source s0/0 it was dest to 126.96.36.199 unsuccessful.
Then I check my BGP table & 188.8.131.52 was not there, because I did not add that in to BGP process I though Loopback will do that cause I added loop 1 in to BGP & it was update source.
Now I added 184.108.40.206/30 in to bgp & it works. All routers can see routes on remote routers.
But I am still not very sure why loopback have not did that when the neighbour relation are formed with Loopback.
From R1 to R4 the issue is that R2 is advertising the prefixes from R4 without changing the next-hop. So R1 will receive R4's prefix with R4 next-hop.
The real issue is that R1 does not have any prefix in the routing table pointing to R4's next-hop (220.127.116.11). If you look in the R1's BGP table for the R4's prefix you will see that the next-hop is maked as inaccesible. That's why the solution included the advertisement of the interconnection prefixes between R1-R3 and R2-R4 into BGP.
R2 show ip bgp 18.104.22.168
R1 show ip bgp 22.214.171.124
You have some mistakes in the BGP config - the mask of loopback1 prefixes of both R1 and R2 are configured wrong on bgp, therefore those 2 prefixes will not be advertised into BGP. You can modify the Loopback's 1 netmask to /24 or you can modifiy the bgp command network for 172.16.20.1 and 172.16.10.1 to /32.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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