This IPv6 circuit flapped so frequently that it would always recover before our monitoring would hit the 3 minute threshold, and as such halt the escalation of the incident. Then, it would start all over. That's why it took a while to notice the problem (I didn't end up getting paged) I think I'm seeing some more connectivity issues today, this time with IPv4 traffic. (Gathering data still, but mentioning it for the sake of logging and such) Update: False alarm, seems to be The Internet At Large that cut-off one DC from ARP briefly as Level3 was dropped from their routing. (Weird) comcast had some major issues earlier nationwide issues