diff --git a/src/uct/ib/base/ib_device.h b/src/uct/ib/base/ib_device.h
index 427d99160f8..926389189fe 100644
--- a/src/uct/ib/base/ib_device.h
+++ b/src/uct/ib/base/ib_device.h
@@ -117,7 +117,8 @@ typedef struct uct_ib_address {
      * - uint16_t subnet16
      * - uint64_t subnet64
      * For RoCE:
-     * - uint8_t gid[16]
+     * - uint16_t udp_sport     
+     * - uint8_t  gid[16]
      */
 } UCS_S_PACKED uct_ib_address_t;
 
diff --git a/src/uct/ib/base/ib_iface.c b/src/uct/ib/base/ib_iface.c
index d9bfcc8c522..8dc4356c407 100644
--- a/src/uct/ib/base/ib_iface.c
+++ b/src/uct/ib/base/ib_iface.c
@@ -256,8 +256,8 @@ size_t uct_ib_address_size(const union ibv_gid *gid, unsigned pack_flags)
     size_t size = sizeof(uct_ib_address_t);
 
     if (pack_flags & UCT_IB_ADDRESS_PACK_FLAG_ETH) {
-        /* Ethernet: address contains only raw GID */
-        return size + sizeof(union ibv_gid);
+        /* Ethernet: address contains only udp sport and raw GID */
+        return size + sizeof(uint16_t) + sizeof(union ibv_gid);
     }
 
     /* InfiniBand: address always contains LID */
@@ -303,6 +303,10 @@ void uct_ib_address_pack(const union ibv_gid *gid, uint16_t lid,
             ib_addr->flags |= UCT_IB_ADDRESS_FLAG_ROCE_IPV6;
         }
 
+        /* udp sport */
+        *(uint16_t*)ptr = lid;
+        ptr             = UCS_PTR_BYTE_OFFSET(ptr, sizeof(uint16_t));
+
         /* uint8_t raw[16]; */
         memcpy(ptr, gid->raw, sizeof(gid->raw) * sizeof(uint8_t));
         return;
@@ -371,6 +375,9 @@ void uct_ib_address_unpack(const uct_ib_address_t *ib_addr, uint16_t *lid,
     *lid                      = 0;
 
     if (ib_addr->flags & UCT_IB_ADDRESS_FLAG_LINK_LAYER_ETH) {
+        /* udp sport */
+        *lid = *(uint16_t*)ptr;
+        ptr   = UCS_PTR_BYTE_OFFSET(ptr, sizeof(uint16_t));
         memcpy(gid->raw, ptr, sizeof(gid->raw) * sizeof(uint8_t)); /* uint8_t raw[16]; */
         return;
     }
@@ -550,8 +557,8 @@ void uct_ib_iface_fill_ah_attr_from_gid_lid(uct_ib_iface_t *iface, uint16_t lid,
         
         /* older drivers use dlid for udp.sport, new drivers use flow_label when
            its nonzero */
-        ah_attr->dlid           = UCT_IB_ROCE_UDP_SRC_PORT_BASE | udp_sport;
-        ah_attr->grh.flow_label = ~udp_sport;
+        ah_attr->dlid           = lid;
+        ah_attr->grh.flow_label = 0;
     } else {
         /* TODO iface->path_bits should be removed and replaced by path_index */
         path_bits              = iface->path_bits[path_index %
diff --git a/src/uct/ib/cm/cm_ep.c b/src/uct/ib/cm/cm_ep.c
index a5ed56430d8..475dfd590e7 100644
--- a/src/uct/ib/cm/cm_ep.c
+++ b/src/uct/ib/cm/cm_ep.c
@@ -88,6 +88,8 @@ static void uct_cm_dump_path(struct ibv_sa_path_rec *path)
 
     uct_ib_gid_str(&path->dgid, dgid_buf, sizeof(dgid_buf));
     uct_ib_gid_str(&path->sgid, sgid_buf, sizeof(sgid_buf));
+    ucs_warn("flow lable is %d", path->flow_label);
+
 
     ucs_trace_data("slid %d sgid %s dlid %d dgid %s",
                    ntohs(path->slid), sgid_buf, ntohs(path->dlid), dgid_buf);
diff --git a/src/uct/ib/rdmacm/rdmacm_cm.c b/src/uct/ib/rdmacm/rdmacm_cm.c
index 00603d1d411..5c98bf86c60 100644
--- a/src/uct/ib/rdmacm/rdmacm_cm.c
+++ b/src/uct/ib/rdmacm/rdmacm_cm.c
@@ -200,6 +200,8 @@ static ucs_status_t uct_rdmacm_cm_id_to_dev_addr(struct rdma_cm_id *cm_id,
     unsigned address_pack_flags;
     union ibv_gid gid;
     int ret;
+    uint16_t udp_sport;
+    uint16_t lid;
 
     /* get the qp attributes in order to modify the qp state.
      * the ah_attr fields from them are required to extract the device address
@@ -218,7 +220,8 @@ static ucs_status_t uct_rdmacm_cm_id_to_dev_addr(struct rdma_cm_id *cm_id,
         ucs_error("ibv_query_port (%s) failed: %m", dev_name);
         return UCS_ERR_IO_ERROR;
     }
-
+    ucs_warn("flow lable %d", qp_attr.ah_attr.grh.flow_label);
+    
     /* Print diagnostic if gid does not match */
     if (qp_attr.ah_attr.is_global &&
         (memcmp(&cm_id->route.addr.addr.ibaddr.dgid, &qp_attr.ah_attr.grh.dgid,
@@ -230,6 +233,7 @@ static ucs_status_t uct_rdmacm_cm_id_to_dev_addr(struct rdma_cm_id *cm_id,
                                qp_attr_gid_str, sizeof(qp_attr_gid_str)));
     }
 
+    udp_sport = 0;
     if (IBV_PORT_IS_LINK_LAYER_ETHERNET(&port_attr)) {
         /* Ethernet address */
         ucs_assert(qp_attr.ah_attr.is_global);
@@ -240,6 +244,9 @@ static ucs_status_t uct_rdmacm_cm_id_to_dev_addr(struct rdma_cm_id *cm_id,
          * that the remote peer is reachable to the local one */
         roce_info.ver         = UCT_IB_DEVICE_ROCE_ANY;
         roce_info.addr_family = 0;
+
+        udp_sport = ibv_flow_label_to_udp_sport(qp_attr.ah_attr.grh.flow_label);
+        ucs_warn("udp_sport %u", udp_sport);
     } else if (qp_attr.ah_attr.is_global) {
         gid                = qp_attr.ah_attr.grh.dgid;
         address_pack_flags = UCT_IB_ADDRESS_PACK_FLAG_SUBNET_PREFIX |
@@ -266,7 +273,12 @@ static ucs_status_t uct_rdmacm_cm_id_to_dev_addr(struct rdma_cm_id *cm_id,
         return UCS_ERR_NO_MEMORY;
     }
 
-    uct_ib_address_pack(&gid, qp_attr.ah_attr.dlid, address_pack_flags,
+    if (IBV_PORT_IS_LINK_LAYER_ETHERNET(&port_attr)) {
+        lid = udp_sport;
+    } else {
+        lid = qp_attr.ah_attr.dlid;
+    }
+    uct_ib_address_pack(&gid, lid, address_pack_flags,
                         &roce_info, dev_addr);
 
     *dev_addr_p     = (uct_device_addr_t *)dev_addr;