On Wed, Feb 18, 2015 at 1:21 PM, Dmitry Konchanin <dmitry.konchanin@dtsanz.com> wrote:

Hi all,

Was it you that gave that talk? The DEI bug was fascinating! (and my fingers keep wanting to type that as DIE bug)

I did glaze over at which points in the fiber network it was occurring in and on what technologies... is there a pdf of your talk available?

And a question that I didnt get a chance to ask was why/when/how does the end user device assert this bit at all?

A bit of necro-posting, but just found in Junos 14.2R2 release notes that they have fixed one of the parts causing the problem.

�� The Priority code point (PCP) and Drop eligible indicator (DEI) bit in 802.1Q header are
preserved while packet gets routed within the same Packet Forwarding Engine (PFE).
The expected behaviour is resetting the PCP and DEI bit when the packet is routed.
PR1036756

It eliminates the need of workaround with manual DEI rewrite rule for outgoing packets mentioned here before.

Kind regards,

Dmitry Konchanin
Senior Network Engineer
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thttp://www.bufferbloat.net/projects/bloat/wiki/Upcoming_Talks