<!-- If you are reporting a new issue, make sure that we do not have any duplicates already open. You can ensure this by searching the issue list for this repository. If there is a duplicate, please close your issue and add a comment to the existing issue instead. If you suspect your issue is a bug, please edit your issue description to include the BUG REPORT INFORMATION shown below. If you fail to provide this information within 7 days, we cannot debug your issue and will close it. We will, however, reopen it if you later provide the information. For more information about reporting issues, see https://github.com/Azure/SONiC/wiki#report-issues --------------------------------------------------- GENERAL SUPPORT INFORMATION --------------------------------------------------- The GitHub issue tracker is for bug reports and feature requests. General support can be found at the following locations: - SONiC Support Forums - https://groups.google.com/forum/#!forum/sonicproject --------------------------------------------------- BUG REPORT INFORMATION --------------------------------------------------- Use the commands below to provide key information from your environment: You do NOT have to include this information if this is a FEATURE REQUEST --> #### Description <!-- Create yang model for the following: "DSCP_TO_FC_MAP" "EXP_TO_FC_MAP" Add unit tests. Relevant PR: https://github.com/Azure/sonic-buildimage/pull/8689 --> #### Steps to reproduce the issue: [New feature] #### Describe the results you received: #### Describe the results you expected: #### Output of `show version`: ``` (paste your output here) ``` #### Output of `show techsupport`: ``` (paste your output here or download and attach the file here ) ``` #### Additional information you deem important (e.g. issue happens only occasionally): <!-- Also attach debug file produced by `sudo generate_dump` -->