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resubmit bridge: fix message_age_timer calculation

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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>
This commit is contained in:
Chris Healy 2013-09-11 21:37:47 -07:00 committed by David S. Miller
parent f25672f1f9
commit 9a0620133c
1 changed files with 1 additions and 1 deletions
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net/bridge/br_stp.c
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@ -209,7 +209,7 @@ static void br_record_config_information(struct net_bridge_port *p,
p->designated_age = jiffies - bpdu->message_age;
mod_timer(&p->message_age_timer, jiffies
+ (p->br->max_age - bpdu->message_age));
+ (bpdu->max_age - bpdu->message_age));
}
/* called under bridge lock */