From: Matt Smith (matt-n-donna@xxxxxxxxxxxxxx)
Date: Sat Nov 24 2001 - 17:10:08 GMT-3
I am betting that the Cat5000 would not have any problems with spanning to
any number of ports. The basic architecture of the Cat5000 lends itself
very well to a multicast and span environment. Since every port receives a
copy of every packet by default. As I recall, its been a while since I
looked into the 5000 since the 6500s came out, the Catlyst 5000 supervisor
sends a fluch message to the ports that are not required to receive the
particular frame that is being serviced. Ever single port gets a copy of
the frame at the same time via the backplane and since every port already
gets the frame then their is little CPU overhead on behalf of the sup to
simply disregard the CAM table lookup for certain ports and not send the
flush message. This is my understanding of the Cat5000. I would like to
see if anyone else recalls this. A good reference on this particular switch
if you can find it is the old CCNP CLSC switching exam book from Cisco
Press. It covers the Cat5000 pretty well. Obvisouly some other switches,
depending on their architecture, would be impacted differnetly by the SPAN
feature. Hope it helps.
Matt Smith
----- Original Message -----
From: "Vega, Juan R, SOBUS" <juanvega@SOLUTIONS.att.com>
To: "'Nathan Cruz'" <cciesoon@home.com>; <ccielab@groupstudy.com>
Sent: Friday, November 23, 2001 12:34 PM
Subject: RE: SPAN Command on 5k/6k
> I have seen this cause a switch to crash! Be very careful with span ports
> on production switches.
>
> -JV-
>
>
> -----Original Message-----
> From: Nathan Cruz [mailto:cciesoon@home.com]
> Sent: Friday, November 23, 2001 5:36 PM
> To: ccielab@groupstudy.com
> Subject: SPAN Command on 5k/6k
>
>
> I was wondering what if any is the effect on CPU, etc. of Spanning to
manny
> ports? For instance if I am using only the default VLAN and SPAN that VLAN
> to
> one port could this cause problems? Thanks.
>
> Nathan
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