Someone found a way to cause ExaBGP to mis-behave back in September (2012-09-05) .. The bug was “funny” enough to justify a blog entry, so let’s look at the route which caused it.
If you are in an hurry, the answer to the mystery was that a route contained an ASN which could not fit in a Python integer. The patch to fix the issue was a one liner to change the base class of an ASN from an integer to a long …