×

Warning message

  • Cisco Support Forums is in Read Only mode while the site is being migrated.
  • Cisco Support Forums is in Read Only mode while the site is being migrated.

DFC3 for WS-X6724-SFP 6500 linecards

Answered Question
Jul 18th, 2012
User Badges:

                   Hello guys!


     When quoting a WS-X6724-SFP line card for a Catalyst 6500:

       1. If no Distributed Forwarding Card 3 (DFC3) is selected, can it be purchased at a later time as a spare part or the client needs to buy the line card with the DFC3 included from start?

       2. Does each line card require a DFC3 in order to be able to perform localized forwarding decisions?

       3. Does the DFC3 card is embedded in the line card physically?        

       4. Documentation such as Q&A if available will help me a lot.

Thanks in advanced guys!

Correct Answer by Joseph W. Doherty about 5 years 1 month ago

Disclaimer


The   Author of this posting offers the information contained within this   posting without consideration and with the reader's understanding that   there's no implied or expressed suitability or fitness for any purpose.   Information provided is for informational purposes only and should not   be construed as rendering professional advice of any kind. Usage of  this  posting's information is solely at reader's own risk.


Liability Disclaimer


In   no event shall Author be liable for any damages whatsoever (including,   without limitation, damages for loss of use, data or profit) arising  out  of the use or inability to use the posting's information even if  Author  has been advised of the possibility of such damage.


Posting


Just to add a bit to what Giuseppe posted, you can often mix and match DFCs and Sups, but this may result in suboptimal performance although in some cases it makes sense to obtain "better/newer" version for future proofing.  (E.g. DFC3B and DFC3C both cost the same, and the latter is backward compatible with the former.)


Some mix and matched configurations require a full chassis reload, not just a card OIR, to configure the DFC properly.


Usually the DFC is optional, but on at least one card, it's standard, i.e. the 6708 10 gig.

Correct Answer by Giuseppe Larosa about 5 years 1 month ago

Hello Nephtali,


1) 6700 series with optional DFC supports distributed forwarding

see

http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps708/product_data_sheet0900aecd801459a7.html


the DFC3 version should match the PFC version in the supervisor

example for a sup720 3BXL with a 3BXL PFC the DFC type should be DFC3 3BXL too.


2) a mix of distributed and centralized forwarding linecards is supported in the same chassis.

see C6500 architecture whitepaper


http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps708/prod_white_paper0900aecd80673385.html


3) DFC3 X  is a daughter card that can be mounted on the top of the linecard when the linecard is removed from the chassis


see fig.4 in the first document


4) Q&A about PFC , DFC an CFC


http://www.cisco.com/en/US/products/hw/switches/ps708/products_qanda_item09186a00809a7673.shtml


Hope to help

Giuseppe

  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 5 (2 ratings)
Loading.
Correct Answer
Giuseppe Larosa Wed, 07/18/2012 - 09:50
User Badges:
  • Super Silver, 17500 points or more
  • Hall of Fame,

    Founding Member

Hello Nephtali,


1) 6700 series with optional DFC supports distributed forwarding

see

http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps708/product_data_sheet0900aecd801459a7.html


the DFC3 version should match the PFC version in the supervisor

example for a sup720 3BXL with a 3BXL PFC the DFC type should be DFC3 3BXL too.


2) a mix of distributed and centralized forwarding linecards is supported in the same chassis.

see C6500 architecture whitepaper


http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps708/prod_white_paper0900aecd80673385.html


3) DFC3 X  is a daughter card that can be mounted on the top of the linecard when the linecard is removed from the chassis


see fig.4 in the first document


4) Q&A about PFC , DFC an CFC


http://www.cisco.com/en/US/products/hw/switches/ps708/products_qanda_item09186a00809a7673.shtml


Hope to help

Giuseppe

fuhrersk8 Wed, 07/18/2012 - 10:36
User Badges:

Excellent! Thanks a lot for all the documentation.

Correct Answer
Joseph W. Doherty Wed, 07/18/2012 - 13:05
User Badges:
  • Super Bronze, 10000 points or more

Disclaimer


The   Author of this posting offers the information contained within this   posting without consideration and with the reader's understanding that   there's no implied or expressed suitability or fitness for any purpose.   Information provided is for informational purposes only and should not   be construed as rendering professional advice of any kind. Usage of  this  posting's information is solely at reader's own risk.


Liability Disclaimer


In   no event shall Author be liable for any damages whatsoever (including,   without limitation, damages for loss of use, data or profit) arising  out  of the use or inability to use the posting's information even if  Author  has been advised of the possibility of such damage.


Posting


Just to add a bit to what Giuseppe posted, you can often mix and match DFCs and Sups, but this may result in suboptimal performance although in some cases it makes sense to obtain "better/newer" version for future proofing.  (E.g. DFC3B and DFC3C both cost the same, and the latter is backward compatible with the former.)


Some mix and matched configurations require a full chassis reload, not just a card OIR, to configure the DFC properly.


Usually the DFC is optional, but on at least one card, it's standard, i.e. the 6708 10 gig.

Actions

This Discussion

Related Content