[c-nsp] 7600 Linecard decisision

[Arie Vayner (avayner)]

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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