[c-nsp] 7600 Linecard decisision

[Peter Basquiat]

Arie, thanks for your answer.

When comparing this two different QoS models with each other, where are the
main differences?
Are there real disadvantages compared to "normal" CBWFQ?
I believe that I will never use all possible classes in CBWFQ. It seems that
PFC-QoS only supports
up to 8 queues, this would be enough for our purposes.
Per (Ethernet Subinterface/Frame-Relay VC) Queueing/Shaping/Policing should
be possible, i dont think
that the PFC isnt able to do that, right?




2007/5/5, Arie Vayner (avayner) <avayner at cisco.com>:
>
> Peter,
>
> The main difference is that all the "native" LAN modules on the 7600
> (meaning all the WS-X65/67 etc) can't actually support the "normal"
> class-based QoS model, but use a different model.
> You can read about it here:
> http://www.cisco.com/univercd/cc/td/doc/product/lan/cat6000/122sx/swcg/q
> os.htm
>
> This has to do with the way the packets are being handled inside the
> device. For the native LAN modules, all QoS functionality is done on the
> PFC, and it supports only the above QoS functionality.
>
> When using SIP modules (or older OSM/FlexWan modules), the QoS
> functionality (as well as other things such as MPLS features) are
> enhanced by the fact that the SIP has extended processing resources on
> the module and the software allows using this processing power for
> features which are not available on the native LAN modules. This
> explains the additional cost - the SIPs have much more hardware on them
> (such as processor, memory etc)
>
> I think you can find some interesting reading on the SIPs here:
> http://www.cisco.com/univercd/cc/td/doc/product/core/cis7600/76sipspa/si
> pspasw/index.htm
>
> Arie
>
> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net
> [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Peter Basquiat
> Sent: Saturday, May 05, 2007 19:09 PM
> To: cisco-nsp at puck.nether.net
> Subject: Re: [c-nsp] 7600 Linecard decisision
>
> It's not really clear in which direction our QoS stuff will expand. At
> the moment Iam thinking on typically class-based wfq on core and edge.
>
> What are the differences regarding QoS on the WS-X6582-2PA compared to
> SIP400/SPA?
>
> Other question: talking about features, what's with the WS-X67xx
> modules, are there other/more features available or do they have only
> more bandwidth?
>
> SIP400+SPA is much more expensive, without knowledge about the exact
> advantages it's really
> hard to judge.
>
>
> >Peter,
> >
> >Going for the SIP/SPA combination would allow you more features
> >especially
> with regards to QoS and VPN PE-CE support.
> >Can you expand a bit about what kind of core/access QoS you require?
> >
> >Arie
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