doc: Add docs for ospf proactive-arp command

Signed-off-by: Jakub Urbańczyk <xthaid@gmail.com>

diff --git a/doc/user/ospfd.rst b/doc/user/ospfd.rst
index 16eaf3be2a7ce63d91ace7ebf8ef97ce04c45b5d..9aae89daee544516f0d17da2c45deffad02b86ed 100644 (file)
--- a/doc/user/ospfd.rst
+++ b/doc/user/ospfd.rst
@@ -310,6 +310,17 @@ To start OSPF process you have to specify the OSPF router.
    In some cases it may be more convenient to enable OSPF on a per
    interface/subnet basis (:clicmd:`ip ospf area AREA [ADDR]`).
 
+.. index:: proactive-arp
+.. clicmd:: proactive-arp
+
+.. index:: no proactive-arp
+.. clicmd:: no proactive-arp
+
+   This command enables or disables sending ARP requests to update neighbor
+   table entries. It speeds up convergence for /32 networks on a P2P
+   connection. 
+
+   This feature is enabled by default.
 
 .. _ospf-area: