Latency/Packet Loss on ASR1006

Sat Nov 27 12:40:54 UTC 2021

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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