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Date:   Mon, 13 Apr 2020 01:50:37 +0200
        Stephen Hemminger <>,
        Bastien Roucariès <>
Subject: [PATCH 5/6] Document root_block option

From: Bastien Roucariès <>

Root_block is also called root port guard, document it.

Signed-off-by: Bastien Roucariès <>
 man/man8/bridge.8 | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/man/man8/bridge.8 b/man/man8/bridge.8
index 9bfd942f..ff6a5cc9 100644
--- a/man/man8/bridge.8
+++ b/man/man8/bridge.8
@@ -372,6 +372,11 @@ enabled on the bridge. By default the flag is off.
 Controls whether a given port is allowed to become root port or not. Only used
 when STP is enabled on the bridge. By default the flag is off.
+This feature is also called root port guard.
+If BPDU is received from a leaf (edge) port, it should not
+be elected as root port. This could be used if using STP on a bridge and the downstream bridges are not fully
+trusted; this prevents a hostile guest from rerouting traffic.
 .BR "learning on " or " learning off "
 Controls whether a given port will learn MAC addresses from received traffic or

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