The Cisco Catalyst 6500 Series Distributed Forwarding Card is an optional daughter card for CEF720-based line cards such as WS-X6704-10GE, WS-X6724-SFP, WS-X6748-SFP, & WS-X6748-GE-TX. The Distributed Forwarding Card supports system virtualization through VSS 1440. The card provides localized forwarding decisions for each line card & scales the aggregate system performance to reach up to 400+ Mbps.