Fabric Analyzer is embedded in the MDS platform. You can capture Fibre Channel control traffic from a switch and decode it without having to disrupt any connectivity, and without having to be local to the point of analysis. You'll use Ethereal to decode the encapsulated Fibre Channel frames on your PC.
http://www.cisco.com/univercd/cc/td/doc/product/sn5000/mds9000/1_3_1/fm_cg/advanced.htm
Cisco MDS 9000 Port Analyzer Adapter allows local monitoring of Fibre Channel-2 (FC-2) to Fibre-Channel 4 (FC-4) layers and Enhanced Inter-Switch Link (EISL) headers with no interruption to traffic flow.
http://www.cisco.com/en/US/products/hw/ps4159/ps4358/products_data_sheet09186a0080142d34.html
Cisco's Fabric Manager Server will collect and analyze historical MDS statistics.
http://www.cisco.com/en/US/products/hw/ps4159/ps4358/products_data_sheet09186a00801d7e8f.html
