[c-nsp] Understanding ASR1k / ESP40 capacity

[Simon Lockhart]

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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