[c-nsp] DFC-3C vs DFC-3CXL

[Marlon Duksa]

Ok. Thanks. This is what I wanted to know. I was aware of the difference in
scaling numbers and the ability to allocate space for mpls labels, IPv4
routes...What I was confused about was the price difference (List Price) -
which is up to $US 60K (for ES+40) cards between the two versions (non-XL
and XL). It's very odd that such a big discrepancy in price is coming from
the size of the TCAM.Thanks,
Marlon

On Mon, Jan 26, 2009 at 1:21 PM, Brandon Bennett <bennetb at gmail.com> wrote:

>
>
> On Mon, Jan 26, 2009 at 12:49 PM, Marlon Duksa <mduksa at gmail.com> wrote:
>
>> Hi - Can someone tell me what is the exact difference between line cards,
>> for example ES20 for 7600, with DFC3C and the XL version of the same?
>> Is it only a DDRAM or is it something else? I know that the
>> scaling numbers are higher on the XL version of the cards but not sure if
>> there is anything else on those cards except the memory that makes it
>> larger? Or is it TCAM? Whatever it is, it looks to me that it is only the
>> external memory in question and nothing inherent to the chips (EARL for
>> example)..
>
>
> The difference si the same as a Sup720 (or RSP) with a PFC3C or PFC3CXL.
> It's all about the size of the routing table.  The DFC3C can only hold aprox
> 256K routes (this will vary based on your configuration/defaults etc).  The
> DFC3CXL can hold approx 1M routes (again check the TCAM configuration guide
> on how to allocate TCAM amongst protocols).
>
> All DFCs/PFCs will run at the lowest common demonitor.  So If you have a
> RSP720-PFC3CXL and a ES20 with a DFC3C in it the entire system will be
> limited to the TCAM size of the DFC3C.
>
> Also if you are buying new, please look into the ES20+ which has many
> improvements over the ES20.
>
> -Brandon Bennett
>
>