Networks A and B are connected to R1 and have route to R2 and then
Internet.(normal flow),all the links are iBGP.
There are cases where I want that networkA will take different path,
means via R3 (for limited time,I want to control it)
I want that R3 will do the new advertisement when i want to change the normal flow of the traffic sourced from net A. My concept is to make a BGP advertisement that will trigger some rules/routes in R1 (like the sinkhole solution of Cisco under DDOS attack) and cause the packets from net A to pass via R3.
Some minor configs on R1 are possible but the main config/advertisement
In your answer please forget PBR (no ip policy on interfaces but
I'm searching for BGP tricks to do it.(tags are also possible)
The main problem here that legacy routing works on destination (which in
case is unknown/internet) and here I have to decide based on the source without PBR.
I want that the process will be as mach as it can be automatically.
The Internet routes are not issue here. The main things is about Routing principles want that only traffic from net A will take different path not all the updates from R1.As I know the local preference will do it to all updates.
Because the basic routing algorithm is working based on destination the only module/process that I know that can route based on source is PBR.Do you know anything else?
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