[c-nsp] 12.2(33)SRA is finally out!

[Tim Stevenson]

All the better, the same should apply to 7600 then.

Tim

At 11:35 AM 7/10/2006 -0400, Rodney Dunn interjected:
>We actually do the tcp adjust MSS in the CEF path on software
>forwarding platforms.
>
>Rodney
>
>On Sun, Jul 02, 2006 at 09:11:29AM -0700, Tim Stevenson wrote:
> > Yes, that is my understanding, the initial SYN is handled in the
> > process path, while the remaining packets are CEF switched in
> > software based platforms.
> >
> > Tim
> >
> > At 11:09 AM 7/2/2006 -0400,  uttered:
> > >Tim,
> > >
> > >My apologies for straying off topic, but can you explain how central
> > >forwarding platforms (7200, ISR, etc) handle mss-adjust ? The SYN
> > >packets get handled in the process path, and the rest of the 
> flow hits CEF ?
> > >
> > >On 6/27/06, Tim Stevenson
> > ><<mailto:tstevens at cisco.com>tstevens at cisco.com> wrote:
> > >The model is that the ACL TCAM is programmed to punt just initial TCP
> > >SYN packets to the RP CPU so the MSS can be modified as it transits
> > >the router.
> > >
> > >Yes, this has implications for the CPU utilization in the face of
> > >heavy SYN traffic - you can configure the ACL bridge input rate
> > >limiter on PFC3 to rate limit traffic punted due to an ACL bridge
> > >result (mls rate-limit unicast acl input <rate>), but doing so could
> > >be a tradeoff between CPU & session establishment time.
> > >
> > >Thanks,
> > >Tim
> > >
> > >At 04:27 AM 6/27/2006, Ian Henderson submitted:
> > > >On Sun, 25 Jun 2006, Asbjorn Hojmark - Lists wrote:
> > > >
> > > > > I don't know for sure, but I don't see how it could be. The 
> MSS is a TCP
> > > > > option, and when it's changed, you have to recalculate 
> headers checksums
> > > > > etc.
> > > >
> > > >That's why I posted the question - it sounded an odd thing to add.
> > > >
> > > >Since posting, our Cisco SE has told us that a number of the features in
> > > >SRA were crossported from the 7200, possibly including CEF based Adjust
> > > >MSS.
> > > >
> > > >--
> > > >Ian Henderson, CCIE #14721
> > > >Senior Network Engineer, iiNet Limited
> > > >_______________________________________________
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> > >
> > >
> > >
> > >Tim Stevenson, <mailto:tstevens at cisco.com>tstevens at cisco.com
> > >Routing & Switching CCIE #5561
> > >Technical Marketing Engineer, Catalyst 6500
> > >Cisco Systems, <http://www.cisco.com>http://www.cisco.com
> > >IP Phone: 408-526-6759
> > >********************************************************
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> > >
> >
> >
> >
> > Tim Stevenson, tstevens at cisco.com
> > Routing & Switching CCIE #5561
> > Technical Marketing Engineer, Catalyst 6500
> > Cisco Systems, http://www.cisco.com
> > IP Phone: 408-526-6759
> > ********************************************************
> > The contents of this message may be *Cisco Confidential*
> > and are intended for the specified recipients only.
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Tim Stevenson, tstevens at cisco.com
Routing & Switching CCIE #5561
Technical Marketing Engineer, Catalyst 6500
Cisco Systems, http://www.cisco.com
IP Phone: 408-526-6759
********************************************************
The contents of this message may be *Cisco Confidential*
and are intended for the specified recipients only.