Upgrade Internet router with new ISP for NEW BGP as a secondary

[byme88]

I have an existing Internet router Cisco 3945 that have an existing BGP connection, I am planning to replace this router with a new Cisco 4331, adding an additional Gigabit interface to peering with a NEW ISP for another BGP peering.

The goal is to terminate the existing BGP and swing the traffic to NEW BGP ISP.

What is the best practice to do something like this scenario?

I am thinking to replace the existing 3945 router with new 4331 with additional BGP configuration for the NEW BGP, and make it a secondary Internet access, then remove the existing Primary BGP.

The question is which way is the best way to do this with minimum downtime???

Any comment, suggestion, advice is much appreciated!

I uploaded a simple drawing for current 3945 router and projection of replacement 4331 router. Also, I posted the current configuration of the existing 3945 router.

Thank you in advance

byme88

[Richard Burts]

byme88

You are welcome. I am glad that our suggestions have been helpful. Thank you for marking this question as solved. This will help other participants in the community to identify discussions which have helpful information. This community is an excellent place to ask questions and to learn about networking. I hope to see you continue to be active in the community.