As you are altering the way traffic is handled between peers, you will need to reset the connection for the no route map to take effect.
Rather than "clear ip bgp * soft" it's better if you specify the peer you wish to clear. Doing a hard clear will take only a small amout of time to come back - but it will feel like forever!! A soft reset will just clear the session between the two peer and will drop some traffic, but it should not be noticable by anyone.
You can set a kron job to run when traffic is at it's least to perform the reset for you. Check out this link for specifics:-
really cool this cron for routers, though I dont see an use for this at this moment.
Actually down time is a big problem and I'd like to make it 0, as we have 2 cores connecting to 2 routers on the ISP, I was looking for a solution to make a change without losing even the traffic flowing through the router at the moment of the change.
Your question is the basic IP BGP configuration. The route-map you apply in IP BGP in our case is use for establish IP BGP policies for Incomming traffic.
If you not use this policies, default is every routing information you need will be advertise to upstream you are connected.
The command line use best effort for change routing information for advertise.
In your case, when you use no neighbor TEST route-map RMAP out , you make your connect transparent with every traffic. When you use clear ip bgp * soft out will make the big change in your routing table with more than 180000 prefix. This reason will make your core system down.
You can make your system with strong policies and use clear ip bgp xxx.xxx.xxx.xxx soft out with separate neigbours.
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