Last Call Review of draft-ietf-rtgwg-spf-uloop-pb-statement-09
review-ietf-rtgwg-spf-uloop-pb-statement-09-secdir-lc-hallam-baker-2019-01-07-00

The document describes the problem and solution pretty clearly. Unfortunately,
there is no discussion of the security considerations which is not appropriate
for a document addressing an availability which is a security issue.

While microloops can form by chance, some consideration should be given to the
possibility that an attacker could induce a loop to perform a DoS attack.