On 16 January 2017 at 16:53, Tore Anderson <tore@fud.no> wrote: Hey,
(Server) --10GE--> (T2 leaf X) --40GE--> (T2 spine) --40GE--> (T2 leaf Y) --10GE--> (IP-transit/"the Internet") --10GE--> (Client)
If I understand you correctly you're saying this is a "suspect" topology that cannot achieve 10G transmission rate from server to client (or from client to server for that matter) because of small buffers on my "T2 leaf Y" switch (i.e., the one which has the Internet-facing interface)?
This mostly isn't suspect, depending how utilised it is. If it's verbatim like above, then it's never going to be suspect, as the T2_leaf_Y is going to see large pauses between each frame coming from the 40Gbps side, so it's not going to need to store large burst of 40Gbps traffic, as no one is generating at 40Gbps, so it can cope with very small buffers. -- ++ytti