You eluded to one of my strongest selling points on DFCs though I don't
think you made that particular connection yet. DFCs offload QoS to the
LC as you said. That also means that CoPP is also handled in hardware
if you have DFCs in place since it requires MLS QoS on that platform.
Ie, if your 6500/7600 is going to be publicly-accessible on the Internet
in any capacity and you want it to be able to use CoPP to withstand a
targeted DoS attack then DFCs are not optional, they're critical.
The others on the list can probably give you much more in-depth views on
the other aspects of the card but I found CoPP to be a big enough
selling point. It wouldn't be good is a simple little DoS attack took
down my core 7600s.
Justin
Alan Buxey wrote:
hi,
okay, from the background of I know what the DFC is and how it
operates etc... i know I want them - however, I need to justify
the upgrade/part cost to sort out a couple of 6500's. in some of
our 6500's, the 10G blades have DFCs already...but several 6724's dont
(they just have CFC). ...as i said, I want them, but need to get
some management/funding buy-in - and they dont want the 'what it
does' information - they want some hard and fast facts that Cisco dont
sem to want to tell me ..... so, the question is
1) is there any way of showing the sup720 strain/utilisation...particularly
is there a way of showing DFC usage on the blades where we have them?
2) it offloads IPv6 and QoS - we're into both of those (and more so over the
next year) - any particular insights into QoS performance/issues without
DFC ? any throughput figures for IPv6 ?
(i know that with CFC we're limited to the backplane (32mpps?) and we get ~
48mpps
per blade with DFC)
...or could it be that DFC's are only really useful to a particular deployment
and I just *think* i need them? ;-)
alan
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