diff --git a/config-models/aether-4.x/files/yang/onf-vcs.yang b/config-models/aether-4.x/files/yang/onf-vcs.yang
index 9573a00..a0dbbff 100755
--- a/config-models/aether-4.x/files/yang/onf-vcs.yang
+++ b/config-models/aether-4.x/files/yang/onf-vcs.yang
@@ -166,6 +166,18 @@
             units bps;
             description "Per-Slice MBR downlink data rate in bps";
           }
+
+          leaf uplink-burst-size {
+            type at:burst;
+            units bytes;
+            description "Per-Slice Uplink burst size";
+          }
+
+          leaf downlink-burst-size {
+            type at:burst;
+            units bytes;
+            description "Per-Slice Downlink burst size";
+          }
         }
       }