From 0c1fe04488c3d732b7a9abfa1210b6af21e8613c Mon Sep 17 00:00:00 2001
From: Randy Bush <randy@psg.com>
Date: Wed, 4 Sep 2019 17:03:53 -0700
Subject: [PATCH] drop HELLO if session already established

---
 draft-ietf-lsvr-l3dl.xml | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/draft-ietf-lsvr-l3dl.xml b/draft-ietf-lsvr-l3dl.xml
index 23bc141..027a0c5 100644
--- a/draft-ietf-lsvr-l3dl.xml
+++ b/draft-ietf-lsvr-l3dl.xml
@@ -729,6 +729,9 @@ uint32_t sbox_checksum_32(const uint8_t *b, const size_t n)
     (plus VID).  The two devices establish an L3DL session by exchanging
     OPEN PDUs.</t>
 
+    <t>If a HELLO is received from a MAC address with which there is an
+    established session, it should be dropped.</t>
+
     <t>The Payload Length is zero as there is no payload.</t>
 
     <t>HELLO PDUs can not be signed as keying material has yet to be