The answer is no. I have tried before and I now think of spanning a port as
a 6th state of the STP... Listen only to the other port.... .. to TX and
receive to the sniffer you will need another NIC and Port
Now a question back to the group... Across an ATM cloud... using LANE... and
ELANS.... Is there a way to see ALL Vlan traffic (Inc. from switches across
the cloud) when you span a VLAN on a switch... Thus far I can ONLY see the
broadcast traffic!
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
Priscilla Oppenheimer
Sent: Friday, December 29, 2000 4:42 PM
To: [EMAIL PROTECTED]; [EMAIL PROTECTED]
Subject: Re: can SPAN port transmit?
The reason I ask is that my client is developing a network management box
that will connect to a SPAN port and collect traffic as well as
occasionally send SNMP queries and other UDP packets.
He realizes that if the user were collecting data from many ports there
would be performance issues. However, he wants to know, in the absence of
performance problems, will his device be able to send some queries? Is
sending disabled on the SPAN port? The other answers (from people who have
tried it) make me think the answer is no, sending is not disabled.
Priscilla
At 04:46 PM 12/29/00, [EMAIL PROTECTED] wrote:
>Cisco employees have confirmed for me that devices connected to span ports
>are unable to act as normal hosts by design.
>
>
>
>
>
>
>Priscilla Oppenheimer <[EMAIL PROTECTED]>@groupstudy.com on 12/29/2000
>03:27:52 PM
>
>Please respond to Priscilla Oppenheimer <[EMAIL PROTECTED]>
>
>Sent by: [EMAIL PROTECTED]
>
>To: [EMAIL PROTECTED]
>cc: (bcc: Kevin Cullimore)
>Subject: can SPAN port transmit?
>
>
>Hi folks,
>
>If I connect a Sniffer-like device to the SPAN port of a switch, will the
>Sniffer-like device be able to transmit data?
>
>My guess is no. From my reading on Cisco's SwitchProbe external hardware
>probes, it appears that the SwitchProbe needs an additional port to send
>data to a network management system. One port connects to a SPAN port on
>the switch and the other port connects to a normal port and is configured
>in "management mode."
>
>But, does anyone have experience with trying to send from a device
>connected to a SPAN port?
>
>Thanks
>
>Priscilla
________________________
Priscilla Oppenheimer
http://www.priscilla.com
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