diff --git a/hadoop-hdds/interface-client/src/main/proto/hdds.proto b/hadoop-hdds/interface-client/src/main/proto/hdds.proto
index 82504492eb8f..7c7f61cb8e00 100644
--- a/hadoop-hdds/interface-client/src/main/proto/hdds.proto
+++ b/hadoop-hdds/interface-client/src/main/proto/hdds.proto
@@ -228,13 +228,29 @@ enum ReplicationType {
     RATIS = 1;
     STAND_ALONE = 2;
     CHAINED = 3;
+    EC = 4;
 }
 
+//Deprected: we should use replication config implementations everywhere
 enum ReplicationFactor {
     ONE = 1;
     THREE = 3;
 }
 
+//replicaiton config for Ratis replication. Will replace pure ReplicationType everywhere
+message RatisReplicationConfig {
+    required ReplicationFactor factor = 1;
+}
+
+message StandaloneReplicationConfig {
+    required ReplicationFactor factor = 1;
+}
+
+message ECReplicationConfig {
+    required int32 data = 1;
+    required int32 parity = 2;
+}
+
 enum ScmOps {
     allocateBlock = 1;
     keyBlocksInfoList = 2;
diff --git a/hadoop-hdds/interface-server/src/main/proto/ScmServerProtocol.proto b/hadoop-hdds/interface-server/src/main/proto/ScmServerProtocol.proto
index 5eac5be45171..e4c4f5a3ba64 100644
--- a/hadoop-hdds/interface-server/src/main/proto/ScmServerProtocol.proto
+++ b/hadoop-hdds/interface-server/src/main/proto/ScmServerProtocol.proto
@@ -125,10 +125,18 @@ enum Status {
 message AllocateScmBlockRequestProto {
   required uint64 size = 1;
   required uint32 numBlocks = 2;
+
+  //deprecated, use RatisReplicationConfig
   required ReplicationType type = 3;
-  required hadoop.hdds.ReplicationFactor factor = 4;
+  
+  optional hadoop.hdds.ReplicationFactor factor = 4;
   required string owner = 5;
   optional ExcludeListProto excludeList = 7;
+
+  //based on replication type, at least one of these should be included
+  optional hadoop.hdds.RatisReplicationConfig ratisReplicationConfig = 8;
+  optional hadoop.hdds.ECReplicationConfig ecReplicationConfig = 9;
+  optional hadoop.hdds.StandaloneReplicationConfig standaloneReplicationConfig = 10;
 }
 
 /**