BGP - Why another implementation?

been using zebra, and suffering
bugs bugs bugs
awkward configuration
unhappy with its performance
Documentation and error messages in japanese or missing.

zebra makes heavy use of cooperative threads, and a central event queue. can lose sessions while busy.

successor: quagga. many bugs fixed, but still using the zebra design

turning a generic unix host into a bgp router requires more than just adding a userland bgp speaker