Troubleshooting guide

3. Troubleshooting Functional Failures During Operation
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Table 3-13: Communication failure analysis method when PoE is used
3.5.7 Communication failures when link aggregation is used
If communication is not possible or if degraded operation is in effect when link aggregation is used,
isolate the cause of the problem according to the failure analysis method in the following table.
Table 3-14: Communication failure analysis method when link aggregation is used
No. Items to check and commands Action
1Use the
show power inline
command to check the information
displayed for
PoEStatus for the target
port.
• When
off is displayed for PoEStatus:
Power is not being supplied. Go to No. 2.
• When
denied is displayed for PoEStatus:
The supplied power is insufficient for the entire switch. Go to No. 3.
• When
faulty is displayed for PoEStatus:
The power supply unit to the connected device is disabled. Go to No.
4.
2 Check whether shutdown is set for the
target port.
• When set:
Set
no shutdown.
• When not set:
Make sure a power-receiving device is connected.
3Use the
show power inline
command to check the values of
Threshold(W) and Allocate(W).
Power cannot be supplied because the value of
Allocate(W) is larger
than the value of
Threshold(W). Check the amount of power being
supplied to the entire switch, the amount of power allocation to the ports,
and the power consumption by the ports, and then adjust the allocation
amount in the configuration.
4 Execute the
show logging command
and check whether a failure has
occurred.
There might be a problem with the power-receiving device or a
connection cable.
• When
0/x Supplying power was stopped by the overload
detection. is displayed:
Power cannot be supplied because an overload was detected.
Check the power-receiving device or connection cables. If the
problem cannot be corrected, check the cable length and cable type
in the Hardware Instruction Manual, and replace the cables.
If devices to which PoE power can be supplied are connected, use
the
power inline configuration command to disable PoE on the
target port.
No. Items to check and commands Action
1Use the
show channel-group
command with the
detail parameter to
check the link aggregation setting that
caused the communication failure.
Make sure the link aggregation mode is the same as the mode for the
remote device. If the modes are different, modify the link aggregation
mode so that it will be the same as the mode for the remote device.
If the link aggregation modes match, check whether the LACP start
method is set to passive for both ports. If passive is set for both ports,
change the setting of one of the ports to active.
2Use the
show channel-group
command with the
detail parameter to
check the operating status of the port
that caused the communication failure.
Check the status of each port displayed for
Status. If all ports of the
channel group have gone down, the channel group also goes down.
Based on the value displayed for
Reason, take one of the actions
described below on ports that have gone down.
• CH Disabled
The link channel group is disabled and down.