ip route-cache flow ..... why

hello

i was looking at trying your software for our 6500 switches, but want to know why you have to enable ip route-cache flow. According th Cisco, NDE is avilable for ip route-cache CEF

'Catalyst 6000 family switches provide Layer 3 switching with Cisco Express Forwarding for Policy Feature Card 2 (CEF for PFC2) or with Multilayer Switching (MLS). You can use NDE to monitor all Layer 3-switched traffic through the Multilayer Switch Feature Card (MSFC). NDE complements the embedded Remote Monitoring (RMON) capabilities on the switch that allow you to see all port traffic. '

http://www.cisco.com/univercd/cc/td/doc/product/lan/cat6000/sft_6_1/configgd/nde.htm

Does your software support NDE for CEF

Cheers