Re: FW: NAT CEF

neda, why do you keep replying with a blank email on every topic???

On Mon, May 24, 2010 at 12:45 AM, Neda Ghafarzadeh <
neda.ghafarzadeh_at_gmail.com> wrote:

> -----Original Message-----
> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
> Carlos G Mendioroz
> Sent: Sunday, May 23, 2010 3:02 PM
> To: swap m
> Cc: Maarten Vervoorn; Cisco certification
> Subject: Re: NAT CEF
>
> FTR, the 12.2(14)SX release notes paragraph:
>
> Prior to Cisco IOS Software Release 12.2(14)SX, the NAT function on the
> Cisco Catalyst 6500 Series Switch was performed in software and bound to
> the
> capacity of the route processor. With the Cisco Supervisor 720 and PFC3,
> coupled with Cisco IOS Software 12.2(14)SX, the NAT function is now
> hardware
> assisted for increased performance and scalability.
>
> So it seems that the PFC3 can do this, I assume a 7600 can/will too.
>
> Interesting, I've been talking about CEF for ages, and just this year I've
> started to link some loose ends. Like it supporting L4 stuff when it is
> advertised as an advanced L3 mech.
> Has anybody some doc on how is CEF implemented in different archs ?
> I've learned that is software on some, more hardware on others, but I guess
> that the API is more or less the same on all.
>
> I had thought that all L4 features just where implemented as ACLs punting
> the traffic to the proc, but it seems that's not the case.
>
> -Carlos
>
> swap m @ 19/05/2010 13:59 -0300 dixit:
> > yeah sure, and i must add tht its mandate to have a new IOS supporting
> > the hardware switching for nat. newer trains in 12.2SX series support
> > hardware nat switching.
> >
> > On Wed, May 19, 2010 at 8:15 PM, Carlos G Mendioroz <tron_at_huapi.ba.ar>
> wrote:
> >>
> >> swap m @ 19/5/2010 11:43 -0300 dixit:
> >>> For 5-6Mb traffic, you can safetly use NAT.
> >>>
> >>> on 6500, NAT translation creation is software switched, the flow
> >>> afterwards is still on hardware.
> >> Are you sure about this ?
> >> -Carlos
> >>
> >>> IP nat outside doesnt affect other traffic that doesn't match NAT
> >>> rule. Other traffic is hardware switched as if NAT is not configured.
> >>> And in case you feel the traffic rate will be high in future, you
> >>> can always put a NAT ratelimit, that'll ensure the box doesnt die.
> >>>
> >>> Swap
> >>> #19804
> >>>
> >>> On Wed, May 19, 2010 at 6:14 PM, Maarten Vervoorn
> >>> <mr.vervoorn_at_gmail.com>
> >>> wrote:
> >>>> Only a small part of that traffic is needed to be translated.
> >>>> 5-6Mbit. So is it the case that when you configure ip nat outside
> >>>> on a interface all traffic will be softare switched from that
> >>>> interface?
> >>>>
> >>>> 2010/5/19 Tyson Scott <tscott_at_ipexpert.com>
> >>>>
> >>>> Maarten,
> >>>>> I would recommend taking this up with your account rep. That is a
> >>>>> lot of traffic to be software switched.
> >>>>>
> >>>>> Regards,
> >>>>>
> >>>>> Tyson Scott - CCIE #13513 R&S, Security, and SP Technical
> >>>>> Instructor - IPexpert, Inc.
> >>>>> Mailto: tscott_at_ipexpert.com
> >>>>>
> >>>>>
> >>>>>
> >>>>> -----Original Message-----
> >>>>> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On
> >>>>> Behalf Of Maarten Vervoorn
> >>>>> Sent: Wednesday, May 19, 2010 9:41 AM
> >>>>> To: Cisco certification
> >>>>> Subject: NAT CEF
> >>>>>
> >>>>> Hi group.
> >>>>>
> >>>>> For the mirgation of a very important business application we want
> >>>>> to use NAT to migrate every connection of that application to the
> >>>>> new IP address.
> >>>>> The networks are configured on a 6500 sup720 switch. I read the
> >>>>> Cisco documentations and noticed that NAT translation had to be
> >>>>> done in software.
> >>>>> The outside NAT interface or on a 20Gbit connections (these are
> >>>>> avarage loaded with 1-5Gbit. Will the configuration of NAT degrade
> >>>>> my performance?
> >>>>>
> >>>>> Kind regards,
> >>>>>
> >>>>> Maarten Vervoorn
> >>>>>
> >>>>>
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> >>>
> >>>
> >>>
> >>>
> >> --
> >> Carlos G Mendioroz <tron_at_huapi.ba.ar> LW7 EQI Argentina
> >
> >
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> >
> >
> >
>
> --
> Carlos G Mendioroz <tron_at_huapi.ba.ar> LW7 EQI Argentina
>
>
> Blogs and organic groups at http://www.ccie.net
>
> _______________________________________________________________________
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Received on Sun May 23 2010 - 23:57:00 ART