I am an assigned GEN-ART directorate reviewer for draft-ietf-bess-evpn-mh-split-horizon-08.

Summary: Ready with nits

Overall I found the document ready for publication. I have not followed the topic thus I abstain myself from technical commentary.

Editorial nits:
1) In Section 1.1 Introduction the acronyms are used without a) expanding them on the first use and/or b) before Section 1.2 Conventions and Terminology. Take ES, ESI, AC, BUM, A-D as examples. Expand and/or rearrange sections.
2)  Some acronyms are not expanded at all in the document. I admit most are common & known within MPLS etc genres but still.. Take PE as an example.
3) No acronym introduction is Section name (i.e. Section 2.1)