[193415] in North American Network Operators' Group
Re: External BGP Controller for L3 Switch BGP routing
daemon@ATHENA.MIT.EDU (Saku Ytti)
Mon Jan 16 10:26:44 2017
X-Original-To: nanog@nanog.org
In-Reply-To: <20170116155328.13a10b42@envy.e1.y.home>
From: Saku Ytti <saku@ytti.fi>
Date: Mon, 16 Jan 2017 17:07:02 +0200
To: Tore Anderson <tore@fud.no>
Cc: nanog list <nanog@nanog.org>
Errors-To: nanog-bounces@nanog.org
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
