diff --git a/controller/ct-zone.c b/controller/ct-zone.c
index e4f66a52a..a3c5b90ff 100644
--- a/controller/ct-zone.c
+++ b/controller/ct-zone.c
@@ -89,7 +89,8 @@ ct_zones_restore(struct ct_zone_ctx *ctx,
 
 void
 ct_zones_update(const struct sset *local_lports,
-                const struct hmap *local_datapaths, struct ct_zone_ctx *ctx)
+                const struct hmap *local_datapaths, struct ct_zone_ctx *ctx,
+                struct ovsrec_open_vswitch_table *ovs_table)
 {
     struct simap_node *ct_zone;
     int scan_start = 1;
@@ -104,6 +105,27 @@ ct_zones_update(const struct sset *local_lports,
         sset_add(&all_users, local_lport);
     }
 
+    /* Add local_loprt name which are supposed to come up on the
+     * chassis and might need ct-zone reservation in advance. 
+     * The data is picked up from ovs_vswitch table. */
+    const struct ovsrec_open_vswitch *cfg;
+    cfg = ovsrec_open_vswitch_table_first(ovs_table);
+    if (cfg) {
+        char *reserve_ct_zone_request_list = smap_get(&cfg->external_ids,
+                                                      "reserve_ct_zones");
+        if (reserve_ct_zone_request_list) {
+            char *duplicate_reserve_list = xstrdup(reserve_ct_zone_request_list);
+            char *reserve_port;
+            char *save_ptr = NULL;
+            for (reserve_port = strtok_r(duplicate_reserve_list, ",", 
+                 &save_ptr); reserve_port != NULL; 
+                 reserve_port = strtok_r(NULL, ",", &save_ptr)) {
+                   sset_add(&all_users, reserve_port);
+            }
+            free(duplicate_reserve_list);
+        }
+    }
+
     /* Local patched datapath (gateway routers) need zones assigned. */
     const struct local_datapath *ld;
     HMAP_FOR_EACH (ld, hmap_node, local_datapaths) {
diff --git a/controller/ct-zone.h b/controller/ct-zone.h
index 889bdf2fc..f5a6b793e 100644
--- a/controller/ct-zone.h
+++ b/controller/ct-zone.h
@@ -62,7 +62,8 @@ void ct_zones_restore(struct ct_zone_ctx *ctx,
                       const struct ovsrec_bridge *br_int);
 void ct_zones_update(const struct sset *local_lports,
                      const struct hmap *local_datapaths,
-                     struct ct_zone_ctx *ctx);
+                     struct ct_zone_ctx *ctx,
+                     struct ovsrec_open_vswitch_table *ovs_table);
 void ct_zones_commit(const struct ovsrec_bridge *br_int,
                      struct shash *pending_ct_zones);
 void ct_zones_pending_clear_commited(struct shash *pending);
diff --git a/controller/ovn-controller.c b/controller/ovn-controller.c
index d6d001b1a..8764dfefa 100644
--- a/controller/ovn-controller.c
+++ b/controller/ovn-controller.c
@@ -2231,7 +2231,7 @@ en_ct_zones_run(struct engine_node *node, void *data)
 
     ct_zones_restore(&ct_zones_data->ctx, ovs_table, dp_table, br_int);
     ct_zones_update(&rt_data->local_lports, &rt_data->local_datapaths,
-                    &ct_zones_data->ctx);
+                    &ct_zones_data->ctx, ovs_table);
 
     ct_zones_data->recomputed = true;
     engine_set_node_state(node, EN_UPDATED);
diff --git a/tests/ovn-controller.at b/tests/ovn-controller.at
index 2cb86dc98..6872dc587 100644
--- a/tests/ovn-controller.at
+++ b/tests/ovn-controller.at
@@ -2529,6 +2529,7 @@ check_ovsdb_zone() {
 
 check ovs-vsctl add-port br-int ls0-hv1 -- set Interface ls0-hv1 external-ids:iface-id=ls0-hv1
 check ovs-vsctl add-port br-int ls0-hv2 -- set Interface ls0-hv2 external-ids:iface-id=ls0-hv2
+check ovs-vsctl set Open_vSwitch . external_ids:reserve_ct_zones=ls0-req-hv3,ls0-req-hv4
 
 check ovn-nbctl lr-add lr0
 
@@ -2554,17 +2555,25 @@ echo "$ct_zones"
 
 port1_zone=$(get_zone_num "$ct_zones" ls0-hv1)
 port2_zone=$(get_zone_num "$ct_zones" ls0-hv2)
-
+req_port3_zone=$(get_zone_num "$ct_zones" ls0-req-hv3)
+req_port4_zone=$(get_zone_num "$ct_zones" ls0-req-hv4)
 snat_zone=$(get_zone_num "$ct_zones" lr0_snat)
 echo "snat_zone is $snat_zone"
 
-check test "$port1_zone" -ne "$port2_zone"
-check test "$port2_zone" -ne "$snat_zone"
-check test "$port1_zone" -ne "$snat_zone"
+zone_list=$(seq(port1_zone, port2_zone, req_port2_zone, req_port4_zone, snat_zone))
+for i in $zone_list; do
+    for j in $zone_list; do
+        if ["$i" != "$j"]; then
+            check tests "$i" -ne "$j"
+        fi
+    done
+done
 
 OVS_WAIT_UNTIL([check_ovsdb_zone ls0-hv1 $port1_zone])
 OVS_WAIT_UNTIL([check_ovsdb_zone ls0-hv2 $port2_zone])
 OVS_WAIT_UNTIL([check_ovsdb_zone lr0_snat $snat_zone])
+OVS_WAIT_UNTIL([check_ovsdb_zone ls0-req-hv3 $req_port3_zone])
+OVS_WAIT_UNTIL([check_ovsdb_zone ls0-req-hv4 $req_port4_zone])
 
 # Now purposely request an SNAT zone for lr0 that conflicts with a zone
 # currently assigned to a logical port
@@ -2579,15 +2588,84 @@ echo "$ct_zones"
 port1_zone=$(get_zone_num "$ct_zones" ls0-hv1)
 port2_zone=$(get_zone_num "$ct_zones" ls0-hv2)
 snat_zone=$(get_zone_num "$ct_zones" lr0_snat)
+req_port3_zone=$(get_zone_num "$ct_zones" ls0-req-hv3)
+req_port4_zone=$(get_zone_num "$ct_zones" ls0-req-hv4)
 
 check test "$snat_zone" -eq "$snat_req_zone"
-check test "$port1_zone" -ne "$port2_zone"
-check test "$port2_zone" -ne "$snat_zone"
-check test "$port1_zone" -ne "$snat_zone"
+
+zone_list=$(seq(port1_zone, port2_zone, req_port2_zone, req_port4_zone, snat_zone))
+for i in $zone_list; do
+    for j in $zone_list; do
+        if ["$i" != "$j"]; then
+            check tests "$i" -ne "$j"
+        fi
+    done
+done
+
+OVS_WAIT_UNTIL([check_ovsdb_zone ls0-hv1 $port1_zone])
+OVS_WAIT_UNTIL([check_ovsdb_zone ls0-hv2 $port2_zone])
+OVS_WAIT_UNTIL([check_ovsdb_zone lr0_snat $snat_zone])
+OVS_WAIT_UNTIL([check_ovsdb_zone ls0-req-hv3 $req_port3_zone])
+OVS_WAIT_UNTIL([check_ovsdb_zone ls0-req-hv4 $req_port4_zone])
+
+# Add port named ls0-req-hv3 and check if same zone assigned
+# previously get assigned to it this time as well.
+
+check ovn-nbctl lsp-add ls0 ls0-req-hv3
+check ovs-vsctl -- add-port br-int hv3-vif3 -- \
+    set interface hv3-vif3 external-ids:iface-id=ls0-req-hv3
+ct_zones=$(ovn-appctl -t ovn-controller ct-zone-list)
+echo "$ct_zones"
+
+check ovn-nbctl --wait=hv sync
+
+req_port3_zone_new=$(get_zone_num "$ct_zones" ls0-req-hv3)
+
+check test "$req_port3_zone -eq $req_port3_zone_new"
+
+OVS_WAIT_UNTIL([check_ovsdb_zone ls0-hv1 $port1_zone])
+OVS_WAIT_UNTIL([check_ovsdb_zone ls0-hv2 $port2_zone])
+OVS_WAIT_UNTIL([check_ovsdb_zone lr0_snat $snat_zone])
+OVS_WAIT_UNTIL([check_ovsdb_zone ls0-req-hv3 $req_port3_zone])
+OVS_WAIT_UNTIL([check_ovsdb_zone ls0-req-hv4 $req_port4_zone])
+
+# Checks for two cases after removing entry from ovs_vswitch table -
+# 1. If port is already up, ct-zone should be reserved.
+# 2. If port is not up yet, ct-zone should not be reserved.
+
+check ovs-vsctl remove Open_vSwitch . external_ids reserve_ct_zones
+
+ct_zones=$(ovn-appctl -t ovn-controller ct-zone-list)
+echo "$ct_zones"
+
+req_port3_zone_after_delete=$(get_zone_num "$ct_zones" ls0-req-hv3)
+req_port4_zone_after_delete=$(get_zone_num "$ct_zones" ls0-req-hv4)
+
+check test "$req_port3_zone_new" -eq "$req_port3_zone_after_delete"
+check test "$req_port4_zone_after_delete" == ""
+
+# Checks for case when a ct-zone is reserved it comes up on that chassis, and
+# gets deleted, but its persisted in ovs_vswitch table, it should persist the
+# same zone throughout.
+
+check ovs-vsctl set Open_vSwitch . external_ids:reserve_ct_zones=ls0-req-hv5
+check ovn-nbctl lsp-add ls0 ls0-req-hv5
+check ovs-vsctl -- add-port br-int hv5-vif5 -- \
+    set interface hv5-vif5 external-ids:iface-id=ls0-req-hv5
+ct_zones=$(ovn-appctl -t ovn-controller ct-zone-list)
+echo "$ct_zones"
+req_port5_zone=$(get_zone_num "$ct_zones" ls0-req-hv5)
+
+check ovs-vsctl remove interface hv5-vif5 external_ids iface-id
+echo "$ct_zones"
+req_port5_zone_new=$(get_zone_num "$ct_zones" ls0-req-hv5)
+
+check test "req_port5_zone" -eq "req_port5_zone_new"
 
 OVS_WAIT_UNTIL([check_ovsdb_zone ls0-hv1 $port1_zone])
 OVS_WAIT_UNTIL([check_ovsdb_zone ls0-hv2 $port2_zone])
 OVS_WAIT_UNTIL([check_ovsdb_zone lr0_snat $snat_zone])
+OVS_WAIT_UNTIL([check_ovsdb_zone ls0-req-hv3 $req_port3_zone])
 
 # Now create a conflict in the OVSDB and restart ovn-controller.
 
