From 2e85b7ccef45924f1aae03513e116b9087c7ef69 Mon Sep 17 00:00:00 2001
From: Christian Breunig <christian@breunig.cc>
Date: Sat, 28 Oct 2023 20:57:38 +0200
Subject: vxlan: T5668: add CLI knob to enable ARP/ND suppression

In order to minimize the flooding of ARP and ND messages in the VXLAN network,
EVPN includes provisions [1] that allow participating VTEPs to suppress such
messages in case they know the MAC-IP binding and can reply on behalf of the
remote host. In Linux, the above is implemented in the bridge driver using a
per-port option called "neigh_suppress" that was added in kernel version 4.15.

[1] https://www.rfc-editor.org/rfc/rfc7432#section-10

(cherry picked from commit ec9a95502daa88b9632af12524e7cefebf86bab6)
---
 interface-definitions/interfaces-vxlan.xml.in | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'interface-definitions')

diff --git a/interface-definitions/interfaces-vxlan.xml.in b/interface-definitions/interfaces-vxlan.xml.in
index d22e46bbc..f20743a65 100644
--- a/interface-definitions/interfaces-vxlan.xml.in
+++ b/interface-definitions/interfaces-vxlan.xml.in
@@ -89,6 +89,12 @@
                   <valueless/>
                 </properties>
               </leafNode>
+              <leafNode name="neighbor-suppress">
+                <properties>
+                  <help>Enable neighbor discovery (ARP and ND) suppression</help>
+                  <valueless/>
+                </properties>
+              </leafNode>
             </children>
           </node>
           #include <include/port-number.xml.i>
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