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Can anyone please explain these commands to me? I am preparing for my BSCI exam and got stuck on this one learning BGP routing..
Here is the topology
(R2) to reach network 22.214.171.124 it needs to use next hope (R4) 10.1.1.4
(R2) to reach network 126.96.36.199 it needs to use next hope (R4) 10.1.1.4
Now we want (R2) to use (R3) as next hope to 188.8.131.52 and keep (R2) to reach network 184.108.40.206 trough (R4) 10.1.1.4
R1 (Config)# access list 18 permit 172.12.34 0.0.0.255
R1 (Config-router-map)#route-map PREFER _R3_FOR _172 permit 10
R1 (Config-router-map)#match ip address 18
R1 (Config-router-map)#set local-pref 200
R1 (Config-router-map)# route-map PREFER _R3_FOR _172 permit 20
R1 (Config-router-map)#set local-pref 100
I know we are trying to get the router to take a different route by creating ACL because that's what we preferred and changing local-pref to higer number will get the job done but something is not clear to me in the config and just needed some more explanation
A 0 is missing from your ACL. Corrected:
access list 18 permit 220.127.116.11 0.0.0.255
This config sets the local preference of the 18.104.22.168 prefix to 200 on R1.
Currently I don't see how it will make R2 to use R3 as the next-hop for this prefix.
Can you please clarify if the topology you have drawn represents also the BGP neighbor relationships between the routers.
Also, please indicate, which neighbor relationship is eBGP and which one is iBGP.
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