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SUP720 support centralized forwarding rates up to 30Mpps and distributed forwarding rates up to 400Mpps...How this is calculated ???

Supervisor Engine 720 options support centralized forwarding rates up to 30Mpps and distributed forwarding rates up to 400Mpps. I never understoond the claim of forwarding rate logic in mpps. How i can load the 6509 box to check this forwarding rate?

How can the performace increase from 30mpps to 400mpps? is this just because of DFC on all the line cards if yes does it mean i have to add the DFC on SUP as well ..confused

Thanks in advance...

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Cisco Employee

Re: SUP720 support centralized forwarding rates up to 30Mpps and

Hi,

400 Mpps is just an average approx value with does not consider the chassis and the supervisor model being used.

Anyway we get to that figure this way.

Supervisor by itself can do max 30Mpps in centralized model. When you add DFCs to 67xx LCs you add 48Mpps per LC of distributed switching.

The 400Mpps was a rounded-up number, because if we take a 9-slot chassis (optimal, as all slots have dual 20Gbps connections whereas on 13-slots chassis only 5 slots have dual 20Gbps connections while the other 8 have a single 20 Gbps connection only ) we have:

1x Supervisor slot = 30Mpps max

8x LCs with DFC    = 48Mpps each max

which gives 8x48+1x30 = 414Mpps.

Unfortunately, at that time, Sup720 had no 10GE uplinks, and there were only two 1GE ports that could forward traffic, so the '30Mpps' was theoretical - as 1GE port can forward up to 1.4Mpps.

The real aggregated number for whole chassis ended up at 8x48 + 1x2.8 giving 386Mpps.

Using the same logic for a 13-chassis we have 5x48 + 7x24 + 2.8 = 411Mpps.

For Sup720-10GE and RSP720-10GE we have an option to use all 4 10GE uplinks plus 2 GE ports on each of

the modules (without considering all the implications of various HA configurations). With 'fabric switching-mode allow dcef-only' on those models, we actually count 48Mpps for active Supervisor and further 34Mpps for uplinks of the secondary Supervisor.

With that scenario and still one Sup, we move to all 9 slots capable of forwarding 48Mpps, so the number goes up to 432Mpps. Same figure for the 13 chassis.

On top of that we need to consider the inherent fabric architecture, for which the value closer to reality even using supervisor with 10GE uplinks is somewhere above 400Mpps.

This is how you get to 400 Mpps!! 

Please rate and close the thread if helpful.

Riccardo

3 REPLIES
Cisco Employee

Re: SUP720 support centralized forwarding rates up to 30Mpps and

Hi,

400 Mpps is just an average approx value with does not consider the chassis and the supervisor model being used.

Anyway we get to that figure this way.

Supervisor by itself can do max 30Mpps in centralized model. When you add DFCs to 67xx LCs you add 48Mpps per LC of distributed switching.

The 400Mpps was a rounded-up number, because if we take a 9-slot chassis (optimal, as all slots have dual 20Gbps connections whereas on 13-slots chassis only 5 slots have dual 20Gbps connections while the other 8 have a single 20 Gbps connection only ) we have:

1x Supervisor slot = 30Mpps max

8x LCs with DFC    = 48Mpps each max

which gives 8x48+1x30 = 414Mpps.

Unfortunately, at that time, Sup720 had no 10GE uplinks, and there were only two 1GE ports that could forward traffic, so the '30Mpps' was theoretical - as 1GE port can forward up to 1.4Mpps.

The real aggregated number for whole chassis ended up at 8x48 + 1x2.8 giving 386Mpps.

Using the same logic for a 13-chassis we have 5x48 + 7x24 + 2.8 = 411Mpps.

For Sup720-10GE and RSP720-10GE we have an option to use all 4 10GE uplinks plus 2 GE ports on each of

the modules (without considering all the implications of various HA configurations). With 'fabric switching-mode allow dcef-only' on those models, we actually count 48Mpps for active Supervisor and further 34Mpps for uplinks of the secondary Supervisor.

With that scenario and still one Sup, we move to all 9 slots capable of forwarding 48Mpps, so the number goes up to 432Mpps. Same figure for the 13 chassis.

On top of that we need to consider the inherent fabric architecture, for which the value closer to reality even using supervisor with 10GE uplinks is somewhere above 400Mpps.

This is how you get to 400 Mpps!! 

Please rate and close the thread if helpful.

Riccardo

New Member

SUP720 support centralized forwarding rates up to 30Mpps and dis

Dear Riccardo,

Hats off to you. I greatly appreciate the knowledge you share.

"A love affair with knowledge will never end in heartbreak "

Cisco Employee

SUP720 support centralized forwarding rates up to 30Mpps and dis

you are welcome

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