diff --git a/tosca-configs/att-workflow/bbwf-iskt-gpon-olt.yaml b/tosca-configs/att-workflow/bbwf-iskt-gpon-olt.yaml
index b21fc2f..93d7e5a 100755
--- a/tosca-configs/att-workflow/bbwf-iskt-gpon-olt.yaml
+++ b/tosca-configs/att-workflow/bbwf-iskt-gpon-olt.yaml
@@ -41,6 +41,7 @@
         outer_tpid: "0x8100"
         uplink: "65536"
         nas_id: "NAS_ID"
+        serial_number: "192.168.100.115:9191"
       requirements:
         - volt_service:
             node: service#volt