Latency/Packet Loss on ASR1006

Sun Nov 28 17:10:45 UTC 2021

Thanks, will look into this.

---
Colin Legendre
President and CTO

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On Sat, Nov 27, 2021 at 7:42 AM Tassos <achatz at forthnet.gr> wrote:

> In the past we had packet loss issues due SIP's PLIM buffer.
>
> The following docs may provide some guidance:
>
>
> https://www.cisco.com/c/en/us/support/docs/routers/asr-1000-series-aggregation-services-routers/200674-Throughput-issues-on-ASR1000-Series-rout.html
>
> https://www.cisco.com/c/en/us/td/docs/interfaces_modules/shared_port_adapters/configuration/ASR1000/asr1000-sip-spa-book/asr-spa-pkt-class.html
>
> --
> Tassos
>
> On 27/11/21 02:11, Fiona Weber via NANOG wrote:
>
> Hi
>
> we see similar problems on ASR1006-X with ESP100 and MIP100. At about ~45
> Gbit/s of traffic (on ~30k PPPoE Sessions and ~700k CGN sessions) the QFP
> utilization skyrockets from ~45 % straight to ~95 % :(
> I don't know if it's the CGN sessions or the traffic/packets causing the
> load increase, the datasheet says it supports something like 10M
> sessions.... but maybe not if you really intend to push packets through it?
> We have not seen such spikes with way higher pps, but lower CGN session
> count, when we had DDoS Attacks against end customers.
>
> Fiona
> On 11/26/21 20:09, Colin Legendre wrote:
>
> Hi,
>
> We have ...
>
> ASR1006  that has following cards...
> 1 x ESP40
> 1 x SIP40
> 4 x SPA-1x10GE-L-V2
> 1 x 6TGE
> 1 x RP2
>
> We've been having latency and packet loss during peak periods...
>
> We notice all is good until we reach 50% utilization on output of...
>
> 'show platform hardware qfp active datapath utilization summary'
>
> Literally ... 47% good... 48% good... 49% latency to next hop goes from
> 1ms to 15-20ms... 50% we see 1-2% packet-loss and 30-40ms latency... 53% we
> see 60-70ms latency and 8-10% packet loss.
>
> Is this expected... the ESP40 can only really push 20G and then starts to
> have performance issues?
>
>
>
> ---
> Colin Legendre
>
>
>
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