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

[Tassos Chatzithomaoglou]

I think i haven't made it clear enough....

Let's suppose i have the following 2 systems:

6500/SUP720-3BXL
6724-SFP (DFC-3CXL)

6500/SUP720-3BXL
6724-SFP (DFC-3BXL)

If i'm not mistaken both will operate in 3BXL mode, so what is the disadvantage of the first one?


Now, suppose i also have the following 2 systems:

7600/RSP720-3CXL
6724-SFP (DFC-3CXL)

7600/RSP720-3CXL
6724-SFP (DFC-3BXL)

If i'm not mistaken, the first one will operate in 3CXL, while the second one in 3BXL.
So the first one would be better (in what terms? That is my secondary question).

Generally, why should i choose 3BXL, when with a 3CXL i can have a 3BXL plus something more? That is my primary question.


Regards,
Tassos

Arie Vayner (avayner) wrote on 20/2/2008 6:20 μμ:
> Tassos,
> 
> Basically, if you have a Sup720-3B, it means you have a PFC3B.
> If you have a module with DFC-3BXL then you will gain nothing, as the DFC has to match with the PFC model, so basically even though you have DFC-3BXL, it would operate in 3B mode.
> 
> The same works the other way. If you have Sup720-3BXL and DFC-3B on some module, you would basically force the whole router to work in 3B mode.
> 
> The reason for this is very simple. The DFC is basically a distributed replica of the central PFC, so they can only operate in the same mode.
> 
> Arie
> 
> -----Original Message-----
> From: Tassos Chatzithomaoglou [mailto:achatz at forthnet.gr] 
> Sent: Wednesday, February 20, 2008 18:11 PM
> To: Arie Vayner (avayner)
> Cc: cisco-nsp
> Subject: Re: [c-nsp] DFC-3BXL vs DFC-3CXL
> 
> Hi Arie,
> 
> Can you please explain the "has to be matched" part?
> 
> I have both 6500/SUP720 and 7600/RSP720 systems and i would prefer to get DFC-3CXL cards (instead of DFC-3BXL), so i can use them at their maximum efficiency in both systems (interchangeably). Isn't that possible?
> 
> 
> Regards,
> Tassos
> 
> Arie Vayner (avayner) wrote on 20/2/2008 6:00 μμ:
>> Tassos,
>>
>> DFC-3CXL is used with RSP720, while DFC-3BXL is used with SUP720.
>> The DFC has to be matched with the RSP/SUP module, as it is basically a
>> replica of the PFC.
>>
>> Arie
>>
>>  
>>
>> -----Original Message-----
>> From: cisco-nsp-bounces at puck.nether.net
>> [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Tassos
>> Chatzithomaoglou
>> Sent: Wednesday, February 20, 2008 17:41 PM
>> To: cisco-nsp
>> Subject: [c-nsp] DFC-3BXL vs DFC-3CXL
>>
>> I'm looking for a document describing the differences between these 2
>> DFC modules.
>>
>> Looking through various CCO pages, the only difference i found was the
>> number of mac addresses supported (64k vs 96k).
>> Is there anything else i'm missing?
>>
>> Also, has anyone used DFC-3CXL with 67xx modules on a 6500/SUP720-3BXL
>> system?
>> I guess they get downgraded to 3BXL, but since their price is the same,
>> why not get the newer ones?
>>
>> --
>> Tassos
>>
>> _______________________________________________
>> cisco-nsp mailing list  cisco-nsp at puck.nether.net
>> https://puck.nether.net/mailman/listinfo/cisco-nsp
>> archive at http://puck.nether.net/pipermail/cisco-nsp/
>>
>>
> 
> 
> 

-- 
***************************************
         Tassos Chatzithomaoglou
Network Design & Development Department
              FORTHnet S.A.
          <achatz at forthnet.gr>
***************************************