[c-nsp] Re: Cisco 7513 & Bandwidth Points

[Steven Bertsch]

At 02:23 PM 1/14/2005, Matthew Crocker wrote:
>On Jan 14, 2005, at 8:36 AM, Rodney Dunn wrote:
>>
>>Noel, Tom,
>>
>>There are limitations on the 75xx's depending on the
>>RSP/VIP setup you have.
>>
>>It's a distributed platform that does software
>>based forwarding when running in dCEF mode.
>>All packet are switched by the VIPs and never
>>touch the RP.  Therefore the switching capacity
>>is a function of the speed of the VIPs and the
>>features you have enabled in the packet path
>>(ACL's, QOS, etc..).
>Doesn't the RP handle the timing on the CyBus (1.2 gbps) and doesn't it 
>touch the packet when it travels between VIPs on different CyBUSes (7513 
>has 2)?  Bus arbitration is done on the RP ?? The 7500 doesn't have CSC 
>card like the 12k series

My understanding is that, in a dCEF configuration, this is facilitated by
MEMD which is a memory buffer physically located on the RSP, but
that VIP use of MEMD is independent of the RSP CPU.


Regards,
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Steven Bertsch, System Administrator    Infinity AccessNET
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