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Is there a way to span a port on Catalyst 2950 to multiple ports?

Posted on 2006-10-27
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Last Modified: 2008-01-09
Hello all Experts!
I am trying to span one single port to many ports, that is to say that i would like to have 1 source port and many destination ports. I understand this is only done via a VLAN scenario where you set the source port to feed it to a VLAN.

I think that Catalyst 2950 does not support more than one monitor session.

Please let me know if I am incorrect.

Thank you!
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Question by:maredzki
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Expert Comment

by:JFrederick29
ID: 17820977
Actually, I'm pretty sure you can have 2 SPAN sessions on the 2950.  The same source port can be used in both sessions to different destination ports.
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by:maredzki
ID: 17821145
JFrederick29,
Here is my dump from the sh run. I am not sure this will work as session 2 does not have a source port. If i put source port on session 2 it tells me that Fa0/15 is already configure as source.

The only thing i can try doing is setting session 2 to have a source port of Fa0/14 and destination of Fa0/12.

!
monitor session 1 source interface Fa0/15
monitor session 1 destination interface Fa0/14
monitor session 2 destination interface Fa0/12
end
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Author Comment

by:maredzki
ID: 17821155
Sorry missed a comment...

Here is the error i get when i try to add another destination port in session 1

ADMSW03(config)#monitor session 1 destination interface Fa0/12
Platform only supports a maximum of 1 destination/reflector port(s) in a source

Thank you,
Marek
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Accepted Solution

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JFrederick29 earned 125 total points
ID: 17821364
That's strange.  I could have sworn you could have two sessions with the same source as long as the destination was different.

I guess I was wrong, according to this Cisco doc, you can only have one active SPAN session at a time on the 2950.

SPAN on the Catalyst 2940, 2950, 2955, 2970, 3550, 3560, and 3750 Series Switches
These are guidelines for the configuration of the SPAN feature on the Catalyst 2940, 2950, 2955, 2970, 3550, 3560, and 3750 Series Switches:

The Catalyst 2950 Switches can have only one SPAN session active at a time and can monitor only source ports. These switches cannot monitor VLANs.

http://www.cisco.com/warp/public/473/41.html#topic5
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Author Comment

by:maredzki
ID: 17821829
So what are my options at this point?
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Expert Comment

by:JFrederick29
ID: 17821844
Unfortunately, it sounds like not to many unless you have a 4500 or 6500 that you could do the SPAN on.  It appears only one SPAN session is allowed on the 2950 and you can only have one destination port in a SPAN session.
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