[j-nsp] BPDUs over EVPN?

[Rob Foehl]

On Fri, 18 Oct 2019, Rob Foehl wrote:

> Juniper is now telling me that this is occuring by design, but can't point to 
> any documentation or standards which support that, nor explain why it 
> suddenly changed post-upgrade.  I'm... not convinced.

Plot twist: the BPDUs in question turned out to be PVST+ BPDUs from an 
unknown source, that were helpfully converted to MSTP BPDUs by some 
on-by-default compatibility feature on an ancient pair of 6509s -- which 
then started complaining loudly about and attempting to block ports based 
on the nonsensical MSTP BPDUs which they'd made up.

Ugh.  This is why we can't have nice things.

Anyway...  This still leaves the questions of why this became apparent 
only after an upgrade, why there are now multiple disagreements between 
stated and observed behavior regarding regular BPDUs, and whether any of 
this is correct.  Case is still open, I'll follow up when I know more...

-Rob