[c-nsp] changes in 7600 with DFC3BXL

[Arie Vayner (avayner)]

Vince,

 

TAC is not the right place for this... TAC is meant to deal with break
and fix situations...

 

The best places I would look for information would be the configuration
guides (just search for the word DFC inside the docs using the browser):

http://www.cisco.com/en/US/docs/switches/lan/catalyst6500/ios/12.2SX/con
figuration/guide/book.html

 

A good pointer to understand what PFC/DFC support is affecting:

http://www.cisco.com/en/US/docs/switches/lan/catalyst6500/ios/12.2SX/con
figuration/guide/intro.html#wp1029188

 

Arie

 

 

From: vince anton [mailto:mvanton at gmail.com] 
Sent: Wednesday, February 11, 2009 09:50
To: Arie Vayner (avayner)
Cc: cisco-nsp
Subject: Re: [c-nsp] changes in 7600 with DFC3BXL

 

Arie,

thanks - is there any cisco document that goes into some detail about
the various changes in behaviour/options between pfc and dfc, or should
I open a case with TAC ?


thanks

Mark

2009/2/10 Arie Vayner (avayner) <avayner at cisco.com>

Anton,

With regards to policing, what would happen is that each DFC would have
its own policers, so if you a policy applied for a VLAN which has ports
on different module, each module would have its own policer with the
configured rate. This means that if you set a 10Mbps policer, but you
have ports on 2 separate cards, each card would apply a separate 10Mbps
policer (allowing in total a potential 20Mbps rate).
The same, BTW, applies to aggregate policers.

The only change I can remember right now with regards to Etherchannel is
the optional capability of specifying a load balancing algorithm per
module.

Arie




-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of vince anton
Sent: Tuesday, February 10, 2009 15:06
To: cisco-nsp
Subject: [c-nsp] changes in 7600 with DFC3BXL

hey all,

Quick question for you, hope you can help me.

Im working on installing the DFCs in existing 67xx cards in our 7600s:

7606 w/SUP720-3BXL
2 x 6748-GE-TX
1 x 6704

Im aware there are some differences in how the box reacts when a DFC is
installed (the PFC will no longer need to make all the decisions,
etc...).
In particular this seems to change the beahviour for qos policers as
well as
L2 etherchannels.  Im using both of these, but I cant seem to find any
definite documentation on CCO explaining the exact changes and perhaps
any
recommendations.  Of course I need to know how the box will behave in
order
to plan for this as part of the DFC upgrade, and so far all I found was
an
FAQ at
http://www.cisco.com/en/US/products/hw/switches/ps708/products_qanda_ite
m09186a00809a7673.shtmlwhich
doesn't give so much detail, and a few items in the archives of the
list which touched the surface but didnt dig deep.

would appreciate if anyone can share any detailed info as to how qos and
etherchannel behaviour changes in PFC vs DFCX3BXL

thanks,

anton

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-- 

Thanks,

anton