[c-nsp] WS-6748-SFP with or without DFC?

[Tim Stevenson]

DFC distributes *everything* from the PFC - L2, IP, MPLS, ACLs/QoS, & 
netflow. The PFC & DFC ASICs are the same.

With respect to multicast, DFCs give you efficient egress multicast 
replication, saving fabric b/w, and increase the aggregate multicast 
lookup throughput for the system.

With respect to NF, DFCs give you a dedicated NF table on each DFC + 
on the PFC - each fwding engine maintains its own NF table. So you 
can collect stats for many more flows than w/a centralized fwding 
engine system.

Note that w/NFv9, we can now export IPv4 multicast flow data from 
6500, which may be of use to you based on the requirements you outlined.

Tim

At 05:22 PM 3/13/2006, christian.macnevin at uk.bnpparibas.com vociferated:
>Hi,
>
>Just looking at one of Tim's presentations from Power sessions, and the
>CEF720 module architecture.
>What functionality does the DFC add/distribute on the 67XX cards? This is
>relevant to a high-performance
>multicast enabled LAN environment where we're starting to consider NetFlow
>as a potentially major
>source of information.
>
>Cheers
>Christian
>
>
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Tim Stevenson, tstevens at cisco.com
Routing & Switching CCIE #5561
Technical Marketing Engineer, Catalyst 6500
Cisco Systems, http://www.cisco.com
IP Phone: 408-526-6759
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