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Thank you for the revised version of this document; the edits seem mostly
editorial but appear to point at clarifying my first concern. I'll defer
to the routing reviewers as to whether MNA/ECMP interactions remain an
issue.

I'm a little perplexed that the secdir review marked a doc ready where the
security concept is "we trust the IETF to only define secure usages of this
extension"; however, if the Security ADs are OK with this then I guess I am
too.