Multihomed router located at HQ has multiple 3 paths to the public internet(3 ISP).
1.Please do clarify if the service providers advertise the publicly routed IP block to the public network concurrently or only one does while others occupy redundancy state ? taking loop effect into consideration.
2.Does AS-Prepend superceeds,Weight attribute to influence path to the internet ?
3.What happens when looking glass tool shows a blank result for an enterprise AS no agreed to be advertised by the 3 service providers.
4.What is the best way to troubleshoot,narrow-down and detect where issue lies when BGP internet link ?
5.A service provider claims a problem to be from NIXP.Can you shed more light on this sort of incident?
I can confidently handle layer-1 and few of layer-2 issues.
I really need useful tips on route advertisement on the public internet.
Thank You for your usual apt response..