SONiC ECN Issues and Query

[Jit Gupta]

Hello everyone,

I am facing some issues and queries regarding ECN on SONiC and was wondering if there is anyone else who has faced something similar. I tried to set up WRED in SONiC, and followed the steps enlisted here to check if that works. https://github.com/Azure/sonic-mgmt/blob/master/docs/testplan/QoS-configuration-in-Config-DB.-ECN-WRED-configuration-utility-test-plan.md. Now all the commands shown in this document to verify, works for me. I have also checked the port status and it shows WRED active. Now the issues I have right now are:

• When I write the command ecnconfig -q 3 on -vv to activate ECN, it only shows Enable ECN on  queue 3, but the actual output is supposed to be as per documentation: Enable ECN on Ethernet0,Ethernet8 queue 3. Also  when we run the command ecnconfig -q 3, we were getting the error message: ECN status: Exception caught:  list index out of range. I want to know why it is still showing this, while the port status shows WRED activated.
• To validate the ECN, WRED has predefined three classes. RED, GREEN and Yellow. And the ECN threshold can be set for each of them separately. I would like to know how to classify any incoming traffic into any of these 3 classes, that remains unclear to me.
• Also is there a way to limit the data rate on each port?

I do not know if this is the right place for these queries but I have searching for online resources and haven't found anything that has worked for me till now. Hope someone can help me with this.

Best,

Jit Gupta,

Temple University

Philadelphia, USA.