Chapter 6
Troubleshooting
RUGGEDCOM ROX II
User Guide
824
VLANs
Problem
Solution
The network becomes unstable when a
specific application is started. The network
returns to normal when the application is
stopped.
RSTP sends its configuration messages using the highest possible priority level. If CoS
is configured to allow traffic flows at the highest priority level and these traffic flows burst
continuously to 100% of the line bandwidth, STP may be disrupted. It is therefore advised
not to use the highest CoS.
When a new port is brought up, the root
moves on to that port instead of the port it
should move to or stay on.
Is it possible that the port cost is incorrectly programmed or that auto-negotiation derives an
undesired value? Inspect the port and path costs with each port active as root.
An IED/controller does not work with the
device.
Certain low CPU bandwidth controllers have been found to behave less than perfectly when
they receive unexpected traffic. Try disabling STP for the port.
If the controller fails around the time of a link outage, 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.
Polls to other devices are occassionally lost.
Review the network statistics to determine whether the root bridge is receiving TCNs around
the time of observed frame loss. It may be possible there are problems with intermittent links
in the network.
The root is receiving a number of TCNs.
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.
Section 6.5
VLANs
The following describes common problems related to the VLANs.
Problem
Solution
VLANs are not needed on the network. Can
they be turned off?
Yes. Simply leave all ports set to type
edge
and leave the native VLAN set to 1. This is the
default configuration for the switch.
Two VLANs were created and a number of
ports were made members of them. Now
some of the devices in one VLAN need
to send messages to devices in the other
VLAN.
If the devices need to communicate at the physical address layer, they must be members of
the same VLAN. If they can communicate in a Layer 3 fashion (i.e. using a protocol such as
IP or IPX), use a router. The router will treat each VLAN as a separate interface, which will
have its own associated IP address space.
Summary of Contents for RUGGEDCOM RX1510
Page 32: ...RUGGEDCOM ROX II User Guide Preface Customer Support xxxii ...
Page 44: ...RUGGEDCOM ROX II User Guide Chapter 1 Introduction User Permissions 12 ...
Page 62: ...RUGGEDCOM ROX II User Guide Chapter 2 Using ROX II Using the Command Line Interface 30 ...
Page 268: ...RUGGEDCOM ROX II User Guide Chapter 4 System Administration Deleting a Scheduled Job 236 ...
