6
Question
Command or method
Result
Remarks
Does the port change
between an up and down
state frequently?
display logbuffer
□
OK
□
Not OK
□
Not related
If the port state flaps, check
for the following errors:
•
Link and
optical-electrical
converter errors.
•
Optical power
threshold crossing
events if the port is a
fiber port.
•
Port setting
inconsistencies with
the peer port.
Fiber ports
Do the ports at the two
ends use the same port
settings?
display
current-configuration
interface
□
OK
□
Not OK
□
Not related
When you connect an H3C
device to a device from
another vendor, set the
same port rate and duplex
mode settings at the two
ends as a best practice.
Are CRC errors present on
any fiber port? Is the
number of CRC errors
increasing?
display interface
□
OK
□
Not OK
□
Not related
If CRC errors persist,
replace the transceiver
module or pigtail fiber, or
clean the transceiver
module connector.
Trunk port configuration
Do the peer trunk ports use
the same PVID?
display
current-configuration
interface
□
OK
□
Not OK
□
Not related
Make sure the same PVID
is configured on the trunk
ports between two devices.
Are
the
peer ports
assigned to the same
VLANs?
display
current-configuration
interface
□
OK
□
Not OK
□
Not related
Make sure the trunk ports
between two devices are
assigned to the same
VLANs.
For example, if you assign
a trunk port to all VLANs,
also assign its peer port to
all VLANs.
Are the peer ports set to
the same link type?
display
current-configuration
interface
□
OK
□
Not OK
□
Not related
Make sure the ports
between two devices use
the same link type.
Is a loop present in VLAN
1?
loopback-detection
global enable vlan 1
□
OK
□
Not OK
□
Not related
Remove ports from VLAN 1
as needed.
Spanning tree feature
Is
the
timeout factor
correctly set?
display
current-configuration
□
OK
□
Not OK
□
Not related
As a best practice, set a
timeout factor in the range
of 5 to 7 on a stable
network to avoid
unnecessary
recalculations.
Are ports connected to
end-user devices
display
current-configuration
□
OK
Verify that the output from
