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ROS™ v3.5 168 RS400
If the controller fails around the time of a link outage then there is the remote possibility that
frame disordering or duplication may be the cause of the problem. Try setting the root port of the
failing controller’s bridge to STP.
Problem Eight
My network runs fine with your switch but I occasionally lose polls to my devices.
Inspect network statistics to determine whether the root bridge is receiving TCNs around the
time of observed frame loss. It may be possible that you have problems with intermittent links in
your network.
Problem Nine
I’m getting a lot of TCNs at the root, where are they coming from?
Examine the RSTP port statistics to determine the port from which the TCNs are arriving. Sign-
on to the switch at the other end of the link attached to that port. Repeat this step until the
switch generating the TCNs is found (i.e. the switch that is itself not receiving a large number of
TCNs). Determine the problem at that switch.