Update document about -p 0. When port number is 0, that means do not listen bgp...

Signed-off-by: Kunihiro Ishiguro <ishi@coreswitch.io>

diff --git a/doc/user/bgp.rst b/doc/user/bgp.rst
index 6504e7d206bc19f8826a69a8a24c0471259417cf..7a508b0df60293845d6fdf89fbc7acccc90e32f7 100644 (file)
--- a/doc/user/bgp.rst
+++ b/doc/user/bgp.rst
@@ -29,7 +29,8 @@ be specified (:ref:`common-invocation-options`).
 .. option:: -p <port>
 .. option:: --bgp_port <port>
 
-   Set the bgp protocol's port number.
+   Set the bgp protocol's port number. When port number is 0, that means do not
+   listen bgp port.
 
 .. option:: -r
 .. option:: --retain