AHHHHH! Thanx I keep learning everyday.

yop, yop, yop! There is a high probablity to lose packets on a mirrored port especially if it is trunking 15 used ports. 15 ports 100baseT is a greater total bandwitdh than a fe port or even a giga one.
I guess that common interface counters will gives u statistics info.
Just a tip: U should not transmit any frame from that port. Inputs should be to 0.


show interface fastethernet 0
Fast Ethernet0 is up, line protocol is up
[...]
158773 packets input, 17362631 bytes, 4 no buffer
Received 158781 broadcasts, 0 runts, 0 giants, 7 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
0 watchdog, 0 multicast
0 input packets with dribble condition detected
6299 packets output, 622530 bytes, 0 underruns
1 output errors, 0 collisions, 3 interface resets
0 babbles, 0 late collision, 0 deferred
1 lost carrier, 1 no carrier
0 output buffer failures, 0 output buffers swapped out