Dell Configuration Guide for the S4048–ON System 9.14.2.6

For EBGP neighbors, the next-hop address is the IP address of the connection between the neighbors. For IBGP, the EBGP next-hop address is carried into the local AS. A next hop attribute is set when a BGP speaker advertises itself to another BGP speaker outside its local AS and when advertising routes within an AS. The next hop attribute also serves as a way to direct traffic to another BGP speaker, rather than waiting for a speaker to advertise. When a next-hop BGP neighbor is unreachable, then the connection to that BGP neighbor goes down after hold down timer expiry. The connection flap can also be obtained immediately with Fallover enabled. BGP routes that contain the next-hop as the neighbor address are not sent to the neighbor. You can enable this feature using the neighbor sender-side-loopdetect command.