[c-nsp] GRE throughput on 3750G

[Ray Burkholder]

> Ramcharan, Vijay A wrote:
> > All,
> > I'm just looking for confirmation that GRE on the 3750G is done in
> > software with the resulting low throughput (~20Mbps with iperf across
> > GRE tunnel on 3750G). All testing and reading that I've done
> indicates
> > that the hardware on the 3750 is not especially built for
> > "router-specific" features like GRE. A "show int stats" shows that
> all
> > packets on the tunnel interface in a pair of 3750G switches is
> process
> > switched. The same command on a 3845 shows the majority of the
> traffic
> > is hardware switched/forwarded.
> >
> 
> 3845 is still a software platform (with hardware crypto), but the CPU
> is
> much faster. 3750 routes in hardware, however, its CPU is much slower
> if
> you start doing stuff not supported in hardware.
> 

And I'm told GRE is not officially supported on the 3750.  Even though it
works, it isn't recommended, because, as you've found out, it is process
switched only.


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