show port-channel traffic

Unanswered Question
Oct 9th, 2014
User Badges:

Hello all,

I have 3 port-channels configured for LACP on our Nexus1000V. The uplinks end on a 2960S stack switch, where LACP is also configured.

By running "show port-channel traffic" I get the following.

sh port-channel traffic
ChanId      Port Rx-Ucst Tx-Ucst Rx-Mcst Tx-Mcst Rx-Bcst Tx-Bcst
------ --------- ------- ------- ------- ------- ------- -------
     1    Eth5/3  37.83%   0.00%  48.05%  50.32%  16.97%  27.52%
     1    Eth5/4  62.16%  99.99%  51.94%  49.67%  83.02%  72.47%
------ --------- ------- ------- ------- ------- ------- -------
     2    Eth3/2  19.66%  85.56%  47.82%  58.93%  14.60%  94.64%
     2    Eth3/4  80.33%  14.43%  52.17%  41.06%  85.39%   5.35%
------ --------- ------- ------- ------- ------- ------- -------
     4    Eth4/2   3.54%  97.92%  39.71%  51.32%  27.00%  59.91%
     4    Eth4/4  96.45%   2.07%  60.28%  48.67%  72.99%  40.08%

 

My question is, why isn't traffic evenly distributed between ethernet interfaces, belonging to the same port-channel.

Load balancing is configured as follows:

sh port-channel load-balance

Port Channel Load-Balancing Configuration:
System: source-mac

Port Channel Load-Balancing Addresses Used Per-Protocol:
Non-IP: source-mac
IP: source-mac

 

Thank you in advance,

Katerina

  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 5 (1 ratings)
Loading.
Harish Balakrishnan Thu, 10/09/2014 - 07:25
User Badges:
  • Silver, 250 points or more

Hello Katerina

This is pretty much expected result when you have one server send out more traffic. If you could change the load sharing method to src-dst-ip or src-dst-mac ( based on your traffic flow) you should be able to see better results

 

Hope this helps

Harish.

katerina.dardoufa Mon, 10/20/2014 - 06:33
User Badges:

Thanks for the link and the great information.

I will try to change the algorithm and see what happens.

 

Thanks

InayathUlla Sharieff Thu, 10/09/2014 - 07:44
User Badges:
  • Cisco Employee,

This is expected result.

AS said if you want to see some different or close match between the interfaces you need to try changing the load balancng algorithm on the device.

HTH

Actions

This Discussion