BGP workaround for backbone issue

I had an interesting issue where I had to use BGP traffic engineering to work around an unusual quark with a major backbone provider. The site I was working with was dual-homed using a major national provider and a smaller local provider. In order to better load traffic between the circuits we attempted to use some BGP as-path prepending to favor the major connection less. When we added more than two prepends to the major provider, all traffic on the link stopped and we only saw about 4kbps to traffic on the link.
Continue reading “BGP workaround for backbone issue”