Re: Question about the use of NO_EXPORT in BGP route announcements

hey,

But are there good reasons when an AS might announce a prefix (route) to a transit provider with NO_EXPORT attached? The IP address space in consideration here is meant to have global reachability.

This can be very harmful. Consider IP transit customer of said transit provider that is single homed to said transit provider. Transit provider will select the aggregate prefix with no-export as best and will not propagate it to its customers while there can be alternative routes available between the prefix owner and transit provider. This will result loss of connectivity for those singlehomed customers. -- tarko