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New Member

DFC3 for WS-X6724-SFP 6500 linecards

                   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!

Everyone's tags (4)
2 ACCEPTED SOLUTIONS

Accepted Solutions
Hall of Fame Super Silver

DFC3 for WS-X6724-SFP 6500 linecards

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

Super Bronze

DFC3 for WS-X6724-SFP 6500 linecards

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.

4 REPLIES
Hall of Fame Super Silver

DFC3 for WS-X6724-SFP 6500 linecards

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

New Member

DFC3 for WS-X6724-SFP 6500 linecards

Excellent! Thanks a lot for all the documentation.

Super Bronze

DFC3 for WS-X6724-SFP 6500 linecards

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.

New Member

DFC3 for WS-X6724-SFP 6500 linecards

Perfect. Thanks for the information.

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