If you have a SGE2010, it does support mirroring, but if you haven't got a SGE2010 consider looking at the Sx500 or Sx500X series.
It was recently introduced and is an enhanced version of the 300 series switch, that offers some enhanced features such as 10Gb interfaces as well as a real real low cost option for 20 gig stacking interfaces on the SG500X. .
The Sx500 , like it's little brother the Sx300 series switch supports mirroring as well as VLAN mirroring. Even has Layer 3 switching and VRRP.
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Configure Remote Network Monitoring (RMON) Events Control Settings on a Switch through the Command Line Interface (CLI)
Remote Network Monitoring (RMON) was developed by the Internet Engineering Task Force (IETF) to support...