Hi networkers,
First, my apologies if this topic has been re-asked, but unfortunately, I have been searching from Cisco documentation as well as other resources and even I did the lab to see the behavior on this,
we have in production some ISR routers with BGP, but Im trying to understand why it is working as it is right now,
Im not a really expert in BGP path manipulation, but just wanted to see if I can get some doubts cleared as to why it is not being used using one command vs the other,
unfortunately, using the virtual lab, it is not the same thing as using real gear right, so attached Im posting a picture on how it looks like
Background:
R2 is acting as Route Reflector
I dont use the route-map FROM-R4 in R3 towards R2 under BGP config, in R3 Im not receiving any networks being advertised by R1
I even used the next-hop-self command, but still same behavior,
Not sure if its a IOS issue or a limitation with the Router reflector, BGP, etc cause I have seen the same config in other environments and we have the recommended version as per Cisco on those routers, so not really sure you have experienced something similar with this behavior as such or similar
In my virtual lab environment, as soon as I put the route-map, I get the following message:
% Warning: Next hop address is our address
However, in the real network gear, we don't get that message, possibly IOS, model, etc
Questions:
1- Why we have a route-map using the same IP of the router as a next-hop?
2- Should it be the same accomplishment by using the next-hop-self command?
3- Any other consideration as is it acting like that ?
4- Is it a normal and expected behavior due to the manipulation of the next-hop BGP attribute ?
5- Can someone please explain me?
