Is there a recommended maximum that I can prepend my public IP address adverts, to the WAN.
The reason for me asking is I have three ISP's.
ISPA: no prepend
ISPB: As-path prepend x x x x
ISPC: As-path prepend x x x x x x x x
Is prepending 8 times frowned on?
The design goal is any internet traffic comes in via ISPA, unless it is offline, then ISPB , would be used final fall back is ISPC.
The issue is how many prepends to add when I don't know how many AS-paths will be involved between the Internet client and ISP A B C to make sure that ISP A is chosen first.