[j-nsp] BPDUs over EVPN?

[Rob Foehl]

Seeing something "interesting" after an 18.1R3 to 18.4R1 upgrade on some 
EVPN PEs: the 18.4 boxes are now emitting BPDUs toward the CE interfaces 
containing pre-translation VLAN IDs from the CEs attached to remote PEs, 
which as far as I can tell are originating from the remote CE.

Is EVPN expected to be forwarding BPDUs at all, intact or otherwise?

If yes, is that dependent on how it's configured?  In this case, it's 
VLAN-aware virtual switch instances everywhere, rewriting tags for 
multiple VLANs.  Does PBB change things?  We hit another bug where 18.1 
was convinced these are PBB configs, when they're not...

Given the discrepancy between releases, which one is wrong?  I'm two weeks 
into a TAC case that's been passed around several times and still have no 
answers to any of these questions, would appreciate hearing from anyone 
who actually knows.  Thanks!

-Rob