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Port Monitoring


I am planning on configuring Port Monitoring on a 2950 and want to know if there are any problems in leaving port monitoring on for an extended period of time.

I have read and do not see any info about leaving this running for an extended period of time.

I plan on monitoring 8 to 10 ports at a time for an extended period. I will more than likely add 1 port at a time to be monitored to the destination interface just to be sure.

Any info would be greatly appreciated.


5 Replies 5


It's not an issue. Most of the time, SPAN ports are connected to a monitoring device such as an IDS for indefinite periods of time.

Thanks for the info. Much appreciated, but when I went to actually enter the commands for the port, the command was not recognized.

The IOS is 12.1(6)EA2 on the switch. After reading the URL

The first time this command was introduced was in IOS 11.2(8)SA. What gives? Am I missing something here?

Oh :) Port Monitor is not supported on the 2950 model. Thanks for the info.

So I guess all I would have to do is enter the following commands

monitor session 1 source interface fas0/1

monitor session 1 source interface fas0/2

monitor session 1 source interface fas0/3

monitor session 1 source interface fas0/4

monitor session 1 destination interface fas0/5

Then all the traffic from ports 1-4 will be copied to 5, correct?

Thanks for your help!

That is correct.

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