diff --git a/voltha b/voltha
index 05fcd84..6e9dcda 100755
--- a/voltha
+++ b/voltha
@@ -1472,7 +1472,8 @@
         fi
         if [ $(helm list --deployed --short --namespace voltha "^bbsim${instance_num}\$" | wc -l) -ne 1 ]; then
             espin - $NOT_VERIFIED
-            INTERNAL_EXTRA_HELM_INSTALL_ARGS="--set olt_id=$instance"
+            S_TAG=$((900+$instance))
+            INTERNAL_EXTRA_HELM_INSTALL_ARGS="--set olt_id=$instance,s_tag=$S_TAG"
             helm_install - voltha bbsim${instance_num} $VOLTHA_BBSIM_CHART $VOLTHA_BBSIM_CHART_VERSION "Install BBSIM${instance_num}"
             INTERNAL_EXTRA_HELM_INSTALL_ARGS=
         else