Lou,
The answer is yes. I must be more specific in stating that since
LANE extends layer 2 characteristics through the ATM cloud. ELANs are
simply a way of extending a VLAN(lan segment/broadcast domain).
So plugging a sniffer onto a span port that is configured to a specific VLAN
which is mapped to a possible specific ELAN you should be able to capture
all/any traffic within the E-LAN(Extended-VLAN).
What you're seeing would tend to suggest a incorrectly SPAN port.
HTH
Nigel
----- Original Message -----
From: Lou Nelson <[EMAIL PROTECTED]>
To: Priscilla Oppenheimer <[EMAIL PROTECTED]>;
<[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>
Sent: Saturday, December 30, 2000 12:02 AM
Subject: RE: can SPAN port transmit?
> 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
>
> _________________________________
> FAQ, list archives, and subscription info:
> http://www.groupstudy.com/list/cisco.html
> Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
>
> _________________________________
> FAQ, list archives, and subscription info:
http://www.groupstudy.com/list/cisco.html
> Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
>
_________________________________
FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html
Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
