This task is tracking the test case writing activities to cover the bug described below.

 Problem Description: Clearly explain the issue.

After fixing the issue reported in FDP-2643, OVN northd will require a long time to create multiple (e.g. 4096) logical datapaths (e.g. Logical routers) in a single iteration

 Impact Assessment: Describe the severity and impact (e.g., network down,availability of a workaround, etc.).

 Software Versions: Specify the exact versions in use (e.g.,openvswitch3.1-3.1.0-147.el8fdp).

OVN main and OVN 25.09

  Issue Type: Indicate whether this is a new issue or a regression (if a regression, state the last known working version).

regression

 Reproducibility: Confirm if the issue can be reproduced consistently. If not, describe how often it occurs.

always

 Reproduction Steps: Provide detailed steps or scripts to replicate the issue.

cmd=""
for i in {1..4096..1}; do
    cmd="${cmd} -- lr-add lr-${i}"
    if test $(($i % 100)) -eq 0; then
        ovn-nbctl $cmd
        cmd=""
    fi
done
ovn-nbctl --wait=sb $cmd 

 Expected Behavior: Describe what should happen under normal circumstances.

 Observed Behavior: Explain what actually happens.

 Troubleshooting Actions: Outline the steps taken to diagnose or resolve the issue so far.

 Logs: If you collected logs please provide them (e.g. sos report, /var/log/openvswitch/* , testpmd console)