diff --git a/ryu/lib/packet/zebra.py b/ryu/lib/packet/zebra.py
index 76668afa..c3a26a34 100644
--- a/ryu/lib/packet/zebra.py
+++ b/ryu/lib/packet/zebra.py
@@ -141,6 +141,11 @@ ZEBRA_INTERFACE_ACTIVE = 1 << 0
 ZEBRA_INTERFACE_SUB = 1 << 1
 ZEBRA_INTERFACE_LINKDETECTION = 1 << 2
 
+# Zebra interface connected address flags
+ZEBRA_IFA_SECONDARY = 1 << 0
+ZEBRA_IFA_PEER = 1 << 1
+ZEBRA_IFA_UNNUMBERED = 1 << 2
+
 # Zebra link layer types
 ZEBRA_LLT_UNKNOWN = 0
 ZEBRA_LLT_ETHER = 1