Figure 4-4
Troubleshooting flowchart for service interruption due to changes in MSTP topology
MSTP status is
correct?
MSTP recalculation
is performed?
Physical
interface on the device
alternates between Up
and Down?
MSTP
convergence mode is
Normal?
Collect information
Check and modify the
MSTP configuration
Shut down the
flapping interface
Set the MSTP
convergence mode to
Normal
Services are
interrupted or the
device is
disconnected
Yes
No
Seek technical support
Yes
No
End
Is fault rectified?
Is fault rectified?
Is fault rectified?
Yes
No
Yes
Yes
Yes
No
No
No
Seek technical
support
No
Yes
Troubleshooting Procedure
NOTE
Saving the results of each troubleshooting step is recommended. If your troubleshooting fails to correct
the fault, you will have a record of your actions to provide Huawei technical support personnel.
Procedure
Step 1
Check the status of interfaces on MSTP devices.
Check the role of each MSTP-enabled port in each instance.
On the network shown in
, there is only one MSTP ring, which means that each
instance can have only one blocked interface. Run the
display stp
brief
command on each device
to check whether the status of each port is normal.
Huawei AR2200-S Series Enterprise Routers
Troubleshooting
4 LAN
Issue 01 (2012-01-06)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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