From: Ian.C.Stong@xxxxxxxxxxxxxxx
Date: Mon Nov 26 2001 - 14:45:52 GMT-3
I asked this same question to the Cisco TAC awhile back. According to
Cisco documentation and the TAC - enabling span ports has almost no
impact on performance. It was explained along the these lines.
In general, there is no performance impact. The way packets are
switched through a Cat5 or Cat6 switch is a process where all packets
being transferred through a vlan are heard by all ports in that vlan.
This may sound strange, but this traffic flows on the DBUS or Data Bus.
There is a secondary Bus that is used called the Results Bus or RBUS
which tells which ports to forward traffic. Also I asked about the MSFC
card and what impact having one has if any. The MSFC is just another
port in a vlan, so it should not make a performance difference, with or
without an MSFC.
It is possible to overload the destination port, but this will only
cause packets to be dropped on the destination port.
FYI,
Ian
-----Original Message-----
From: bcarter [mailto:bcarter@family-net.net]
Sent: Monday, November 26, 2001 12:26 PM
To: cciesoon; ccielab
Cc: bcarter
Subject: RE: SPAN Command on 5k/6k
An environment I work in has a cat 5500 terminating multiple wire
closets,
servers and head-end routers. We tried spanning a vlan and had many
packets
dropped. Pretty ugly. Enable spanning, many connectivity problems,
disable
span, all the problems went away.
Be careful.
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Nathan Cruz
Sent: Friday, November 23, 2001 11:36 AM
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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