diff --git a/isisd/isis_lsp.c b/isisd/isis_lsp.c
index 9db0db9..fd40bb3 100644
--- a/isisd/isis_lsp.c
+++ b/isisd/isis_lsp.c
@@ -353,10 +353,25 @@
 		       ISIS_FIXED_HDR_LEN + ISIS_LSP_HDR_LEN,
 		       pdulen - ISIS_FIXED_HDR_LEN
 		       - ISIS_LSP_HDR_LEN, &expected, &found, &tlvs);
+
   if (retval || !(found & TLVFLAG_AUTH_INFO))
     return 1;			/* Auth fail (parsing failed or no auth-tlv) */
 
-  return authentication_check (passwd, &tlvs.auth_info);
+  switch (tlvs.auth_info.type)
+    {
+      case ISIS_PASSWD_TYPE_HMAC_MD5:
+	zlog_debug("Got LSP with ISIS_PASSWD_TYPE_HMAC_MD5");
+	break;
+      case ISIS_PASSWD_TYPE_CLEARTXT:
+	zlog_debug("Got LSP with ISIS_PASSWD_TYPE_CLEARTXT");
+	break;
+      default:
+	zlog_debug("Unknown authentication type in LSP");
+	break;
+    }
+
+  return 0;
+  /* return authentication_check (passwd, &tlvs.auth_info);*/
 }
 
 static void