DNS anycast node monitor
rharolde at umich.edu
Thu Apr 16 21:03:00 UTC 2015
We use ExaBGP to query the DNS process locally and advertise/withdraw
We use BFD between the server and the router to detect link failure (or
The BFD (Bidirectional Forwarding Detection) protocol is designed to
rapid detection of communication failures between two devices. Routing
protocols can use BFD state to rapidly (< 1 second) withdraw routes in the
event of a failure, without having to wait for a routing protocol timeout
(3 minutes by default for BGP).
Seems to work well.
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