port mirror problem

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Sep 19th, 2008
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I have recently configured port mirroring in my Cisco 4000 series switch.. Now it is not working .. I m getting the following error.

GigabitEthernet2/9 is up, line protocol is down (monitoring)

How can i rectify.. In the switch , Cable is connected properly.. The light is glowing fine. what could be the problem..

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Mark Yeates Fri, 09/19/2008 - 06:27
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Your port looks fine and that is normal for a port in monitoring mode. Are you not receiving traffic from that port to your sniffer?


John Blakley Fri, 09/19/2008 - 07:42
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I'm not trying to question anything, but you need to make sure that you are connected to the destination port that you're monitoring from. Like Mark said, g2/9 looks fine.

Your source port is g2/9, but your device needs to be connected to the destination port as well.



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