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

Rodney Dunn rodunn at cisco.com
Fri Jan 14 21:16:19 EST 2005


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
> _______________________________________________________________
> Your Business Internet Service Provider


More information about the cisco-nsp mailing list