Latency/Packet Loss on ASR1006

Hank Nussbacher hank at interall.co.il
Wed Dec 8 06:13:57 UTC 2021


On 07/12/2021 17:32, Blake Hudson wrote:

Suggestion: move this thread to cisco-nsp where you might find more 
assistance.

Regards,
Hank

> 
> On 11/26/2021 1:09 PM, 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?
>>
>>
> 
> I haven't experienced that across about a dozen ASR 1ks. Though I just 
> checked and we are not pushing any of our ESP's over 50% currently (the 
> closest we have is an ESP 40 doing 18Gbps). However, I'm pretty sure 
> we've pushed older ESPs (5, 10's, and 20's) to ~75% or so in the past.
> 
> Given the components you have, I would have expected your router to 
> handle 40Gbps input and 40Gbps output. That could either be 40Gbps into 
> the 6 port card [and 40Gbps out of the four 1 port cards] or it could be 
> 40Gbps input that is spread across the 6 port and 1 port cards [that is 
> then output across both cards as well].
> 
> Despite other comments, I think your components are well matched. The 
> only non-obvious thing here is that the 6 port card only has a ~40Gbps 
> connection to the backplane so you cannot use all 6 ports at full 
> bandwidth. I think this router is well suited to handle 20-30Gbps of 
> customer demand doing standard destination based routing (if you're 
> doing traffic shaping, NAT, tunnelling, or something else more involved 
> than extended ACLs you may need something beefier at those traffic levels).



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