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

[Rodney Dunn]

Packets between VIPs go through MEMD
which is located on the RSP.

Some, not all, PA's support local 
switching on the VIPs.

Rodney

On Fri, Jan 14, 2005 at 03:55:02PM -0600, Steven Bertsch wrote:
> 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,
> _______________________________________________________________
> Steven Bertsch, System Administrator    Infinity AccessNET
> sbertsch at iaxs.net                       Voice 952/944-7123 x161
> http://www.iaxs.net/                    Fax   952/944-0115
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