[c-nsp] Understanding ASR1k / ESP40 capacity

Mon Oct 6 12:56:08 EDT 2014

Hi Simon,

In the presentation Steven specifically mentioned at around 35min when talking about sys bw that all you care about is the capacity of the link between the QFP and the central buss -that link is full duplex (shame I could not find it written anywhere in the docs). 
So if the QFP is e.g. 10 gig that link is 10gbps+overhead so if you have 10gig coming in from any of the IOs you're done. 
Getting it out doesn't count as the link is full duplex so once you can get it in you can get it out.

So this supports your claims that you should be able to get 40gbps full-duplex out of the QFP i.e. 40gig in and 40gig out. 

adam
> -----Original Message-----
> From: cisco-nsp [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of
> Simon Lockhart
> Sent: Monday, October 06, 2014 5:25 PM
> To: Pete Lumbis
> Cc: cisco-nsp at puck.nether.net
> Subject: Re: [c-nsp] Understanding ASR1k / ESP40 capacity
> 
> Pete,
> 
> Thanks for this - I'll watch that preso and see if it adds anything useful.
> 
> You seem to be supporting my viewpoint, and I've also had an off-list reply
> supporting TAC's viewpoint - so I'm not sure I'm any further forwards.
> 
> I'm currently working on a plan to replace the ESP40 with an ESP100 - but as
> the ESP100 isn't supported in the ASR1004, I'll also have to do a chassis swap
> to an ASR1006. My only remaining concern with this plan is whether the SIP40
> can really do 40Gbps. If I stick 4 * 10G SPA's into a SIP40, can I run those 10G
> ports at line-rate (assuming sufficient ESP capacity)?
> 
> Many thanks,
> 
> Simon
> 
> 
> 
> On Sat Oct 04, 2014 at 11:56:45AM -0400, Pete Lumbis wrote:
> > It would be a single pass through the QFP. The SIP could also be a
> > limiting factor, but since you are split between SIPs that shouldn't be an
> issue.
> > The SIP 40 has 2x 40Gig lanes on the backplane. Are you doing crypto
> > or anything like that which would impact performance?
> >
> > There is a great Cisco Live preso on the ASR1k architecture that might
> > help you get some ammo to go back to TAC with.
> > http://d2zmdbbm9feqrf.cloudfront.net/2014/usa/pdf/BRKARC-2001.pdf
> >
> > -Pete
> >
> > On Sat, Oct 4, 2014 at 4:56 AM, Simon Lockhart <simon at slimey.org> wrote:
> >
> > > All,
> > >
> > > I'm banging my head against a brick wall trying to get sensible
> > > answers from Cisco TAC, so thought I'd ask the educated masses who
> > > may have come across this before...
> > >
> > > I've got a Cisco ASR1004 with RP2, ESP40, 2 * SIP40's, and 8 * 10GE ports.
> > >
> > > A snapshot of usage on these ports at peak is:
> > >
> > > Interface         RxBps     RxPps          TxBps     TxPps
> > > Te0/0/0   4,385,563,000   515,508    906,118,000   339,997
> > > Te0/1/0   3,942,338,000   419,696    984,150,000   358,436
> > > Te0/2/0   3,949,993,000   425,192    933,257,000   349,145
> > > Te0/3/0   4,375,526,000   512,858    873,284,000   334,751
> > > Te1/0/0   1,186,440,000   454,714  5,474,029,000   630,916
> > > Te1/1/0     622,154,000   244,056  3,181,689,000   338,190
> > > Te1/2/0     711,493,000   253,275  3,211,560,000   340,950
> > > Te1/3/0   1,218,873,000   437,195  4,831,708,000   568,488
> > >
> > > TOTAL    20,392,380,000 3,262,494 20,395,795,000 3,260,873
> > >
> > > I'm seeing throughput issues on a portchannel consisting of Te0/0/0
> > > and
> > > Te0/3/0
> > > (it won't go over 10Gbps aggregate)
> > >
> > > Cisco TAC are telling me if I add TxBps and RxBps totals together, I
> > > get 40Gbps, so I've reached capacity of the QFP (i.e. ESP40).
> > >
> > > My arguement against this is that a packet which enters the router
> > > on Te0/0/0, goes through the SIP40 in slot 0, through the ESP40,
> > > through the SIP40 in slot 1, and out through Te1/0/0 is still just
> > > one packet, so should only need to be counted once through the ESP,
> > > and once for each SIP. Hence, the throughput on the ESP is only
> > > 20.3Gbps on those numbers above.
> > >
> > > If I poll ceqfpUtilProcessingLoad by SNMP, I see peaks of around
> > > 65%, which would correlate with this level of throughput.
> > >
> > > I'm assuming there are others of you using this platform. What sort
> > > of throughput are you seeing? Am I right, or is the Cisco TAC engineer?
> > >
> > > TIA,
> > >
> > > Simon
> > > _______________________________________________
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> > >
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