Dear colleagues, When withdrawing an IP prefix from the Internet, an origin network sends BGP withdraw messages, which are expected to propagate to all BGP routers that hold an entry for that IP prefix in their routing table. Yet network operators occasionally report issues where routers maintain routes to IP prefixes withdrawn by their origin network - BGP zombies.
Please find more details on RIPE Labs: https://labs.ripe.net/Members/romain_fontugne/bgp-zombies Kind regards, Mirjam Kühne RIPE NCC
