If bridge is configured with no STP and forwarding delay of 0 (which
is typical for virtualization) then when link starts it will flood all
packets for the first 20 seconds.
This bug was introduced by a combination of earlier changes:
* forwarding database uses hold time of zero to indicate
user wants to always flood packets
* optimzation of the case of forwarding delay of 0 avoids the initial
timer tick
The fix is to just skip all the topology change detection code if
kernel STP is not being used.
Signed-off-by: Stephen Hemminger <shemminger@xxxxxxxxxx>
--- a/net/bridge/br_stp.c 2009-05-14 13:34:49.965908836 -0700
+++ b/net/bridge/br_stp.c 2009-05-14 14:15:11.370903917 -0700
@@ -297,6 +297,9 @@ void br_topology_change_detection(struct
{
int isroot = br_is_root_bridge(br);
+ if (br->stp_enabled != BR_KERNEL_STP)
+ return;
+
pr_info("%s: topology change detected, %s\n", br->dev->name,
isroot ? "propagating" : "sending tcn bpdu");
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