doc: Add paragraph about `bgp suppress-duplicates` command

Signed-off-by: Donatas Abraitis <donatas.abraitis@gmail.com>

diff --git a/doc/user/bgp.rst b/doc/user/bgp.rst
index 73c286631a73227e022f583cd74f33dba5a751ca..1ee8f885d5ed3b4a2b985dfefc33cd7889c87662 100644 (file)
--- a/doc/user/bgp.rst
+++ b/doc/user/bgp.rst
@@ -454,6 +454,17 @@ Reject routes with AS_SET or AS_CONFED_SET types
 
    This command enables rejection of incoming and outgoing routes having AS_SET or AS_CONFED_SET type.
 
+Suppress duplicate updates
+--------------------------
+
+.. index:: [no] bgp suppress-duplicates
+.. clicmd:: [no] bgp suppress-duplicates
+
+   For example, BGP routers can generate multiple identical announcements with
+   empty community attributes if stripped at egress. This is an undesired behavior.
+   Suppress duplicate updates if the route actually not changed.
+   Default: enabled.
+
 Disable checking if nexthop is connected on EBGP sessions
 ---------------------------------------------------------