At 11:17 AM 6/18/01, Wilson, Christian wrote:
>So if I am connected to the SPAN destination port and am monitoring VLAN 1,
>what is 90-100% utilized? The SPAN destination port?
I wouldn't say the port. Think about it from the Sniffer's point of view.
The Sniffer is reporting that the network to which it is attached is 90%
utilized. Presumably that network is the cable between the SPAN destination
port on the switch and the NIC in the Sniffer.
The Sniffer is just a network monitor. It is using a 100-Mbps NIC,
presumably. It compares bits per second that it receives to 100-Mbps and
reports this as a utilization percentage. It doesn't know about the
architecture of the network (VLANs, etc.) or the architecture of the switch
(backplanes, SPAN destination ports, etc.) But you know this. So just use
common sense. You connected your Sniffer to a SPAN destination port. Well,
that's what the Sniffer sees then -- the traffic that you are sending to
the SPAN port in your switch.
Priscilla
> > -----Original Message-----
> > From: Priscilla Oppenheimer [SMTP:[EMAIL PROTECTED]]
> > Sent: Monday, June 18, 2001 11:09 AM
> > To: Wilson, Christian; [EMAIL PROTECTED]
> > Subject: Re: SPAN question on 6509 [7:8959]
> >
> > The Sniffer doesn't know anything about the 32 Gbps backplane. It just
> > knows it's connected to a 100 Mbps Ethernet port.
> >
> > Priscilla
> >
> > At 12:08 PM 6/18/01, Wilson, Christian wrote:
> > >I have set span to mirrior VLAN 1 traffic out destination port 5/33.
> > When I
> > >connect my NAI Sniffer to port 5/33, it returns a utilization rate of
> > >90-100%. When I look to see how many bytes of traffic are being sent,
my
> > >Sniffer tells me 10 million to 15 million octets. How can this be
> > 90-100%
> > >utilization on VLAN 1? Doesn't a 6509 have something like a 32Gbs
> > >backplane? To my calculations, 15 million octets is (15 million octets
X
> > >8bits) = 120mbs, not even close to capacity. Can someone tell me where
I
> > am
> > >going wrong?
> > ________________________
> >
> > Priscilla Oppenheimer
> > http://www.priscilla.com
________________________
Priscilla Oppenheimer
http://www.priscilla.com
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=8964&t=8959
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