PFC can do policing (actually it has some different policing options
over the regular policing in regular IOS), but it can't do shaping.
Queuing is done on the egress linecard.
Arie
________________________________
From: Peter Basquiat [mailto:[EMAIL PROTECTED]
Sent: Saturday, May 05, 2007 21:33 PM
To: Arie Vayner (avayner)
Cc: [email protected]
Subject: Re: [c-nsp] 7600 Linecard decisision
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) <[EMAIL PROTECTED]>:
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: [EMAIL PROTECTED]
[mailto: [EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]> ] On Behalf Of Peter Basquiat
Sent: Saturday, May 05, 2007 19:09 PM
To: [email protected]
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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