From 669c81001fd0bd914fb2a1c15ddbb427de8a8373 Mon Sep 17 00:00:00 2001
From: Chris Healy <cphealy@gmail.com>
Date: Wed, 11 Sep 2013 21:37:47 -0700
Subject: [PATCH] resubmit bridge: fix message_age_timer calculation

[ Upstream commit 9a0620133ccce9dd35c00a96405c8d80938c2cc0 ]

This changes the message_age_timer calculation to use the BPDU's max age as
opposed to the local bridge's max age.  This is in accordance with section
8.6.2.3.2 Step 2 of the 802.1D-1998 sprecification.

With the current implementation, when running with very large bridge
diameters, convergance will not always occur even if a root bridge is
configured to have a longer max age.

Tested successfully on bridge diameters of ~200.

Signed-off-by: Chris Healy <cphealy@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
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