Switch Port ANalysis and 3500XL Series SWitch

[RICHARD MESSINGER]

I remember reading somewhere that on some switches that have their port set up to monitor other port, that there was a restriction that they could not also be used to send traffic. In particular, I need to check to see if a 3512XL has this restriction. That is, if I do the following:

Interface FastEthernet 0/1

port monitor fastethernet0/2

port monitor fastethernet0/3

Can the device connected to Fast0/1 also send traffic out that interface?

[rsissons]

No, if the port is configured as a span port, it cannot be used to pass normal traffic.

[johnyoon75]

If some port had a role of Monitoring port, the port can't communicate other hosts.

If you want to know port status, you can use "show interface fastethernet 0/1". after that you can see the port status "monitoring". that mean is, nobody can't commuinicate other host that connected interface fastethernet 0/1.

SPAN Limitations

When using the SPAN feature, the monitoring port receives copies of transmitted and received traffic for all monitored ports. If the monitoring port is 50 percent oversubscribed for a sustained period of time, it will probably become congested. One or more of the ports being monitored might also experience a slowdown.