[c-nsp] (overbooked) SPAN on 3750

[Tom Zingale (tomz)]

In general, oversubscription should just result in some packets being
dropped from the oversubscribed span destination port.  Span is handled
in hardware, so there should be no effect on cpu load.  

> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-
> bounces at puck.nether.net] On Behalf Of Gert Doering
> Sent: Monday, March 05, 2007 6:37 AM
> To: cisco-nsp at puck.nether.net
> Subject: [c-nsp] (overbooked) SPAN on 3750
> 
> Hi,
> 
> I'm searching for an architecture document regarding SPAN on 3750s -
> that
> is, specifically, for an answer to the question "what happens if I
> oversubscribe the SPAN port on a stack of 3750?".
> 
> I could imagine a couple of answers
> 
>  - the SPAN port will drop everything that's above the interface's
>    capacity, and the remaining switch (stack) will not be affected
>    [this is the answer I am hoping for]



> 
>  - there will be higher CPU load, but otherwise packet handling will
>    be unaffected [well, still ok with me]
> 
>  - packet forwarding for other ports will be affected (head-of-line
>    blocking, internal bus saturation, ...) [baaad].
> 
> gert
> 
> --
> USENET is *not* the non-clickable part of WWW!
> 
> //www.muc.de/~gert/
> Gert Doering - Munich, Germany
> gert at greenie.muc.de
> fax: +49-89-35655025                        gert at net.informatik.tu-
> muenchen.de
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