diff --git a/configs/pdc/pdc-mdf-a8360-sw1.cfg b/configs/pdc/pdc-mdf-a8360-sw1.cfg
index 7f3705d..342e46f 100644
--- a/configs/pdc/pdc-mdf-a8360-sw1.cfg
+++ b/configs/pdc/pdc-mdf-a8360-sw1.cfg
@@ -202,13 +202,13 @@ vlan 254
     description Transit VLAN
     dhcpv4-snooping
 vlan 503
-    name CT-A
+    name ring3_ct-a
     dhcpv4-snooping
 vlan 513
     name CT-B
     dhcpv4-snooping
 vlan 523
-    name SH-A
+    name ring3_sh-a
     dhcpv4-snooping
 vlan 533
     name SH-B
@@ -221,6 +221,10 @@ spanning-tree priority 2
 spanning-tree trap topology-change instance 0
 spanning-tree ignore-pvid-inconsistency
 spanning-tree vlan 10,20,30,35,50,70,72,168,230,254,503,513,523,533,699
+spanning-tree vlan 503 priority 15
+spanning-tree vlan 513 priority 15
+spanning-tree vlan 523 priority 15
+spanning-tree vlan 533 priority 15
 interface mgmt
     no shutdown
     ip static 192.168.60.1/24
@@ -435,16 +439,18 @@ interface vlan 254
     ip ospf network point-to-point
     ip pim-sparse enable
 interface vlan 503
-    description to ring 3
+    description ring3_ct-a
     ip address 10.250.203.60/24
     ip ospf 1 area 0.0.0.0
     no ip ospf passive
+    ip ospf cost 3000
     ip pim-sparse enable
 interface vlan 523
-    description to ring 3
+    description ring3_sh-a
     ip address 10.254.223.60/24
     ip ospf 1 area 0.0.0.0
     no ip ospf passive
+    ip ospf cost 1000
     ip pim-sparse enable
 snmp-server vrf default
 snmp-server system-description pdc-mdf-a8360-sw1