diff --git a/device/arista/x86_64-arista_720dt_48s/Arista-720DT-48S/hwsku.json b/device/arista/x86_64-arista_720dt_48s/Arista-720DT-48S/hwsku.json
index e0dc3fc5e5..44f0a20457 100644
--- a/device/arista/x86_64-arista_720dt_48s/Arista-720DT-48S/hwsku.json
+++ b/device/arista/x86_64-arista_720dt_48s/Arista-720DT-48S/hwsku.json
@@ -98,98 +98,122 @@
         },
         "Ethernet24": {
             "default_brkout_mode": "1x1G",
+            "autoneg": "on",
             "port_type": "RJ45"
         },
         "Ethernet25": {
             "default_brkout_mode": "1x1G",
+            "autoneg": "on",
             "port_type": "RJ45"
         },
         "Ethernet26": {
             "default_brkout_mode": "1x1G",
+            "autoneg": "on",
             "port_type": "RJ45"
         },
         "Ethernet27": {
             "default_brkout_mode": "1x1G",
+            "autoneg": "on",
             "port_type": "RJ45"
         },
         "Ethernet28": {
             "default_brkout_mode": "1x1G",
+            "autoneg": "on",
             "port_type": "RJ45"
         },
         "Ethernet29": {
             "default_brkout_mode": "1x1G",
+            "autoneg": "on",
             "port_type": "RJ45"
         },
         "Ethernet30": {
             "default_brkout_mode": "1x1G",
+            "autoneg": "on",
             "port_type": "RJ45"
         },
         "Ethernet31": {
             "default_brkout_mode": "1x1G",
+            "autoneg": "on",
             "port_type": "RJ45"
         },
         "Ethernet32": {
             "default_brkout_mode": "1x1G",
+            "autoneg": "on",
             "port_type": "RJ45"
         },
         "Ethernet33": {
             "default_brkout_mode": "1x1G",
+            "autoneg": "on",
             "port_type": "RJ45"
         },
         "Ethernet34": {
             "default_brkout_mode": "1x1G",
+            "autoneg": "on",
             "port_type": "RJ45"
         },
         "Ethernet35": {
             "default_brkout_mode": "1x1G",
+            "autoneg": "on",
             "port_type": "RJ45"
         },
         "Ethernet36": {
             "default_brkout_mode": "1x1G",
+            "autoneg": "on",
             "port_type": "RJ45"
         },
         "Ethernet37": {
             "default_brkout_mode": "1x1G",
+            "autoneg": "on",
             "port_type": "RJ45"
         },
         "Ethernet38": {
             "default_brkout_mode": "1x1G",
+            "autoneg": "on",
             "port_type": "RJ45"
         },
         "Ethernet39": {
             "default_brkout_mode": "1x1G",
+            "autoneg": "on",
             "port_type": "RJ45"
         },
         "Ethernet40": {
             "default_brkout_mode": "1x1G",
+            "autoneg": "on",
             "port_type": "RJ45"
         },
         "Ethernet41": {
             "default_brkout_mode": "1x1G",
+            "autoneg": "on",
             "port_type": "RJ45"
         },
         "Ethernet42": {
             "default_brkout_mode": "1x1G",
+            "autoneg": "on",
             "port_type": "RJ45"
         },
         "Ethernet43": {
             "default_brkout_mode": "1x1G",
+            "autoneg": "on",
             "port_type": "RJ45"
         },
         "Ethernet44": {
             "default_brkout_mode": "1x1G",
+            "autoneg": "on",
             "port_type": "RJ45"
         },
         "Ethernet45": {
             "default_brkout_mode": "1x1G",
+            "autoneg": "on",
             "port_type": "RJ45"
         },
         "Ethernet46": {
             "default_brkout_mode": "1x1G",
+            "autoneg": "on",
             "port_type": "RJ45"
         },
         "Ethernet47": {
             "default_brkout_mode": "1x1G",
+            "autoneg": "on",
             "port_type": "RJ45"
         },
         "Ethernet48": {
@@ -205,4 +229,4 @@
             "default_brkout_mode": "1x10G"
         }
     }
-}
\ No newline at end of file
+}