Monday 24th June 2019

Global Backbone Route leak on range

We identified a major incident on routing tables on some providers.

AS701 seems to permit the full routes re-announcement from a downstream ASN of the full view (all internet routes).
That leads to routing loops and inconsistent routing tables for an hour on different networks going through major Tier1 like Level3 / Cogent.
These had impacts on many providers seen on the DFZ Routing table.

We have protection mechanisms to avoid internal traffic getting aspirated by the leak, but we can't have an action on what's going on AS701 and upstream/downstream as we don't have any relationship with them.
We have temporarily blocked the responsible ASN to avoid any issue inside our network.