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New Member

Switching Backplane

Hi 

I want to know about the method through which we can calculate the Total Backplane throughput of a switch like 6500 series.

If anybody know please reply to me.

Thanks & Regards 
Rahul Chhabra

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Super Bronze

DisclaimerThe Author of this

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

3)

there is no way you can increase the backplane capacity other than replacing the chassis.

Well, yes and no.

The 6500 series "backplane" capacity depends on the chassis (pre -E offer up to 40 Gbps per slot, -E offer up to 80 Gbps per slot), the supervisor (sup1 and 2, natively, only support the 32 Gbps bus), the supervisor and fabric card (sup2 with SFM provides 256 Gbps fabric, sup720 provides 720 Gbps fabric, sup2T provides 2 Tbps fabric),  the line card (from 32 Gbps bus to 80 Gbps fabric), and even the combination of type of line cards (bus only cards preclude full fabric operation mode, even for installed fabric capable cards) and/or how chassis is configured (combination bus CEF256 line cards offer a choice of which they use to transmit to other cards).  Also with fabric cards, it's possible DFCs are enabled to fully exploit all the fabric bandwidth (i.e. a sup, alone, PPS capacity can bottleneck packet forwarding).

From a configuration only view, pretty much only the bus/CEF256 cards transmission choice can impact performance, otherwise you'll likely need to change hardware, but depending on your needs, just adding a DFC or replacing bus only cards can make a huge difference (although you may need to really load the chassis with traffic to notice).  I.e. you may not need to replace the chassis or all your cards.  (BTW, to fully exploit a sup2T, you need either a 6513-E or a 6807, the latter probably a better choice for a new chassis.)

7 REPLIES
Super Bronze

DisclaimerThe Author of this

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

For a 6500, sup720s provides backplane ("classic bus") of 32 Gbps, and/or fabric offering 256 or 720 Gbps.  The sup2Ts supports the same, but also offers a fabric of 2 Tbps.

Bandwidth per slot varies based on line card, chassis, and supervisors.  Both sup720 and sup2T (in 6500Es) support the 32 Gbps bus, per slot, and/or fabric connections of 1 or 2 channels of 8 Gbps, 1 or 2 channels of 20 Gbps, or (sup2T) dual channels of 40 Gbps (unsure single channel 40 provided).

To take advantage of maximum fabric bandwidth, need to be careful how you mix different architecture line cards and you might also need line card DFCs to provide necessary forwarding performance.

 

New Member

Thanks for the reply Joseph 

Thanks for the reply Joseph

 

New Member

Hi Joseph,I want to now that

Hi Joseph,

I want to now that is their any command through which we can find how much our backplane is under use.

 

Is Backplane capacity differs between line-cards and devices?

What are the different methods through we can increase our backplane capacity?

 

Thanks & Regards,
Rahul Chhabra

Cisco Employee

Rahul,There are few commands

Rahul,

There are few commands which we use to see the backplane.

example:

show fabric

and few internal.

2)

Please find below link which explain details how the artictecture:

http://etherealmind.com/cisco-supervisor-720-why-architecture-performance/

 

3)

there is no way you can increase the backplane capacity other than replacing the chassis.

HTH

Inayath

Super Bronze

DisclaimerThe Author of this

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

3)

there is no way you can increase the backplane capacity other than replacing the chassis.

Well, yes and no.

The 6500 series "backplane" capacity depends on the chassis (pre -E offer up to 40 Gbps per slot, -E offer up to 80 Gbps per slot), the supervisor (sup1 and 2, natively, only support the 32 Gbps bus), the supervisor and fabric card (sup2 with SFM provides 256 Gbps fabric, sup720 provides 720 Gbps fabric, sup2T provides 2 Tbps fabric),  the line card (from 32 Gbps bus to 80 Gbps fabric), and even the combination of type of line cards (bus only cards preclude full fabric operation mode, even for installed fabric capable cards) and/or how chassis is configured (combination bus CEF256 line cards offer a choice of which they use to transmit to other cards).  Also with fabric cards, it's possible DFCs are enabled to fully exploit all the fabric bandwidth (i.e. a sup, alone, PPS capacity can bottleneck packet forwarding).

From a configuration only view, pretty much only the bus/CEF256 cards transmission choice can impact performance, otherwise you'll likely need to change hardware, but depending on your needs, just adding a DFC or replacing bus only cards can make a huge difference (although you may need to really load the chassis with traffic to notice).  I.e. you may not need to replace the chassis or all your cards.  (BTW, to fully exploit a sup2T, you need either a 6513-E or a 6807, the latter probably a better choice for a new chassis.)

New Member

 Thanks again Joseph Regards

 

Thanks again Joseph

 

Regards,
Rahul Chhabra
Network Engineer 
Spooster IT Services

New Member

  Thanks & Regards to you

 

 

Thanks & Regards to you Inayath


Rahul Chhabra
 

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