diff --git a/scripts/base/frameworks/pacf/plugin.bro b/scripts/base/frameworks/pacf/plugin.bro
index 944705605f..ab25911d14 100644
--- a/scripts/base/frameworks/pacf/plugin.bro
+++ b/scripts/base/frameworks/pacf/plugin.bro
@@ -84,8 +84,8 @@ export {
 	# record type from inside itself.
 	redef record PluginState += {
 		## The plugin that the state belongs to. (Defined separately
-                ## because of cyclic type dependency.)   
-		plugin: Plugin &optional;
+		## because of cyclic type dependency.)
+		plugin: Plugin &optional &weaken;
 	};
 
 }
diff --git a/scripts/base/init-default.bro b/scripts/base/init-default.bro
index 0615ce36ef..16650017cb 100644
--- a/scripts/base/init-default.bro
+++ b/scripts/base/init-default.bro
@@ -37,7 +37,8 @@
 @load base/frameworks/reporter
 @load base/frameworks/sumstats
 @load base/frameworks/tunnels
-#@load base/frameworks/pacf
+@load base/frameworks/openflow
+@load base/frameworks/pacf
 
 @load base/protocols/conn
 @load base/protocols/dhcp
diff --git a/src/Attr.cc b/src/Attr.cc
index fc8d3000d1..8b451ca5b1 100644
--- a/src/Attr.cc
+++ b/src/Attr.cc
@@ -18,7 +18,7 @@ const char* attr_name(attr_tag t)
 		"&encrypt",
 		"&raw_output", "&mergeable", "&priority",
 		"&group", "&log", "&error_handler", "&type_column",
-		"(&tracked)", "&deprecated",
+		"(&tracked)", "&deprecated", "&weaken",
 	};
 
 	return attr_names[int(t)];
@@ -436,6 +436,11 @@ void Attributes::CheckAttr(Attr* a)
 			Error("&log applied to a type that cannot be logged");
 		break;
 
+	case ATTR_WEAKEN:
+		if ( ! in_record )
+			Error("&weaken applied outside of record");
+		break;
+
 	case ATTR_TYPE_COLUMN:
 		{
 		if ( type->Tag() != TYPE_PORT )
diff --git a/src/Attr.h b/src/Attr.h
index 63f2524c21..f89fb9f119 100644
--- a/src/Attr.h
+++ b/src/Attr.h
@@ -35,7 +35,8 @@ typedef enum {
 	ATTR_TYPE_COLUMN,	// for input framework
 	ATTR_TRACKED,	// hidden attribute, tracked by NotifierRegistry
 	ATTR_DEPRECATED,
-#define NUM_ATTRS (int(ATTR_DEPRECATED) + 1)
+	ATTR_WEAKEN,
+#define NUM_ATTRS (int(ATTR_WEAKEN) + 1)
 } attr_tag;
 
 class Attr : public BroObj {
diff --git a/src/Type.cc b/src/Type.cc
index 9aa86da8dc..891c69c50f 100644
--- a/src/Type.cc
+++ b/src/Type.cc
@@ -1129,7 +1129,10 @@ void RecordType::DescribeFields(ODesc* d) const
 			const TypeDecl* td = FieldDecl(i);
 			d->Add(td->id);
 			d->Add(":");
-			td->type->Describe(d);
+			if ( td->FindAttr(ATTR_WEAKEN) )
+				d->Add("<weakened>");
+			else
+				td->type->Describe(d);
 			d->Add(";");
 			}
 		}
@@ -1170,7 +1173,10 @@ void RecordType::DescribeFieldsReST(ODesc* d, bool func_args) const
 			}
 
 		const TypeDecl* td = FieldDecl(i);
-		td->DescribeReST(d);
+		if ( td->FindAttr(ATTR_WEAKEN) )
+			d->Add("<weakened>");
+		else
+			td->DescribeReST(d);
 
 		if ( func_args )
 			continue;
diff --git a/src/parse.y b/src/parse.y
index 8054718d45..a7e9eadd19 100644
--- a/src/parse.y
+++ b/src/parse.y
@@ -2,7 +2,7 @@
 // See the file "COPYING" in the main distribution directory for copyright.
 %}
 
-%expect 78
+%expect 81
 
 %token TOK_ADD TOK_ADD_TO TOK_ADDR TOK_ANY
 %token TOK_ATENDIF TOK_ATELSE TOK_ATIF TOK_ATIFDEF TOK_ATIFNDEF
@@ -25,7 +25,7 @@
 %token TOK_ATTR_PERSISTENT TOK_ATTR_SYNCHRONIZED
 %token TOK_ATTR_RAW_OUTPUT TOK_ATTR_MERGEABLE
 %token TOK_ATTR_PRIORITY TOK_ATTR_LOG TOK_ATTR_ERROR_HANDLER
-%token TOK_ATTR_TYPE_COLUMN TOK_ATTR_DEPRECATED
+%token TOK_ATTR_TYPE_COLUMN TOK_ATTR_DEPRECATED TOK_ATTR_WEAKEN
 
 %token TOK_DEBUG
 
@@ -1291,6 +1291,8 @@ attr:
 			{ $$ = new Attr(ATTR_ERROR_HANDLER); }
 	|	TOK_ATTR_DEPRECATED
 			{ $$ = new Attr(ATTR_DEPRECATED); }
+	|	TOK_ATTR_WEAKEN
+			{ $$ = new Attr(ATTR_WEAKEN); }
 	;
 
 stmt:
diff --git a/src/scan.l b/src/scan.l
index a6e37a67f7..8103201303 100644
--- a/src/scan.l
+++ b/src/scan.l
@@ -276,6 +276,7 @@ when	return TOK_WHEN;
 &type_column	return TOK_ATTR_TYPE_COLUMN;
 &read_expire	return TOK_ATTR_EXPIRE_READ;
 &redef		return TOK_ATTR_REDEF;
+&weaken	return TOK_ATTR_WEAKEN;
 &write_expire	return TOK_ATTR_EXPIRE_WRITE;
 
 &encrypt {