NCS540 is not passing the benchmark 10G RFC test

[DanielGutierrez615]

NCS540 is not passing the benchmark 10G RFC test.  The Benchmark test is failing all frame sizes.  However, if I bypass the NCS540 network. I get not issues. I posted the Benchmark tests. One of them passes fine when I bypass the NCS540 devices. The other fails when I run the test thru the NCS540.  Is there a bad configuration that could be causing this?   both devices are currently on version 7.5.2/ncs540/ws.  I also had the same issue on 7.3.2.  I'm only able to get a good benchmark test but only 8.5G  which is bad. I have been reading the release notes, and they do not mention this issue. I have been troubleshooting this for over a month but no luck.  Any ideas? 

[smilstea]

Can you check on the disposition router this CLI?

show controller npu stats voq ingress interface all instance all loc 0/0/CPU0

or more specifically show controller npu stats voq ingress interface hundredGigE 0/0/0/0 instance all loc 0/0/CPU0

replacing with the interface that is ingress from the core to the disposition router and the proper lc.

Also in the example I gave drops were seen with a 1G shaper on a 10G link when sending 1G of traffic, so your test is similar with 100G transport and 10G of traffic.

Sam

[DanielGutierrez615]

That's a great command.  I definitely will keep it in my pocket

[smilstea · Accepted solution]

Yep its as I described. On maitland 540 you are seeing ingress drops due to the increased overhead in packet size, while your hundredgige links handle it no problem the system (disposition/maitland) counts the packets with +22B before the disposition process happens and we can see the dropped packets on TC 0 for the interface. Can you try applying the workaround with a 10G shaper to the ingress interface and the user-defined 22 on maitland?

Sam

[DGIxcoy]

Hello, 

I have a similar setup but I am using 100G links for both ingress and egress ports on the N540. I keep failing 100G RFC test on jumbo frames as well. TAC is currently review my case but has not provided any solutions yet.  

TestBox <100G> N540 <100G> ASR9906 <100G> TestBox2

I am seeing drops on the egress interface of the n540. I have tried adding the shaper on both ingress and egress interfaces with multiple user-defined values and no user-defined value without any luck. If it makes a difference, I am running evpn, isis, mpls. 

Thanks,

Deiby

[DanielGutierrez615]

Yes that did it. Thanks a million!!!