gre: Optimise encap node for tunnel types

Type: improvement

Change-Id: I6627e22110be94c8127486ae009761494e734c04
Signed-off-by: Neale Ranns <nranns@cisco.com>
diff --git a/src/vnet/gre/gre.h b/src/vnet/gre/gre.h
index 14798d8..07f375d 100644
--- a/src/vnet/gre/gre.h
+++ b/src/vnet/gre/gre.h
@@ -340,7 +340,8 @@
 
 extern vlib_node_registration_t gre4_input_node;
 extern vlib_node_registration_t gre6_input_node;
-extern vlib_node_registration_t gre_encap_node;
+extern vlib_node_registration_t gre_erspan_encap_node;
+extern vlib_node_registration_t gre_teb_encap_node;
 extern vnet_device_class_t gre_device_class;
 
 /* Parse gre protocol as 0xXXXX or protocol name.