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RSPAN issue

I have been unable to get RSPAN to work on 2 3550s connected together with an ISL trunk. I have a Sniffer on switch B, and a Windows PC on switch A. Unfortuneately, I found out the hard way that the reflector port takes the ISL trunk out of STP. When I configured and cabled a second trunk, I still cannot get any frames to copy to my Sniffer. I have configured this on 6500s with success, but not 3550s. Has anyone actually tested or used this with 3550s. Thanks in advance.

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Re: RSPAN issue

I have used RSPAN on 3550s with 802.1Q successfully.

Your reflector port should be a port that is not in use. It should not be cabled to anything, it is just a loopback port. Are you running VTP or did you manually configure the RSPAN VLAN on both switches?

If you are still having problems post your configs.

Please rate helpful posts.

2 REPLIES
Blue

Re: RSPAN issue

I have used RSPAN on 3550s with 802.1Q successfully.

Your reflector port should be a port that is not in use. It should not be cabled to anything, it is just a loopback port. Are you running VTP or did you manually configure the RSPAN VLAN on both switches?

If you are still having problems post your configs.

Please rate helpful posts.

New Member

Re: RSPAN issue

I apologize for the delayed response. I was running VTP in client/server mode.

Your suggestion corrected the issue, and I now see traffic on the Sniffer. My first attempt was using a 'disabled' port, which did not work. I had to use a port in 'notconnect' state to get the traffic to span the trunk. Thank you very much for your time.

james

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