Alaxala AX2500S, Руководство по устранению неисправностей

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3 Troubleshooting Functional Failures During Operation
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3.14 Communication failures in the IEEE 802.3ah/UDLD functionality
3.14.1 Port is in inactivate status by the IEEE 802.3ah/UDLD functionality
If the IEEE 802.3ah/UDLD functionality has deactivated a port, isolate the cause of the
problem according to the failure analysis method described in the following table.
Table 3-32 Failure analysis method when the IEEE 802.3ah/UDLD functionality is used
No. Items to check and commands Action
1 Execute the
show efmoam
operation command and check the
failure type for the port that was
deactivated by the IEEE
802.3ah/UDLD functionality.
If
Down
is displayed for
Link status
, go to No. 2.
2 Make sure the IEEE 802.3ah/OAM
functionality is enabled on the
partner switch.

If the IEEE 802.3ah/OAM functionality is not enabled on the
partner switch, enable the functionality.

If the IEEE 802.3ah/OAM functionality is enabled on the
partner switch, go to No. 3.
3 Execute the
show efmoam
statistics
operation command
and check the information displayed
for
Thrashings
.

If the value of
Thrashings
has been incremented, a
prohibited configuration (multiple connection destinations) is
being used. Make sure only one device is specified as the
destination for the target physical port.

If the
Thrashings
value has not been incremented, go to
No. 4.
4 Make sure the Switch is directly
connected to the partner switch.

If a media converter or hub is connected between switches,
review and correct the network configuration so that the
Switch is directly connected to the partner switch. If a relay
device is absolutely necessary, use a media converter that
allows the link status on both sides to be identical (this action
is not recommended, however).

If the switches are directly connected, go to No. 5.
5 Execute the
show efmoam
operation command and check the
number of times a response timeout
occurred during failure detection.

If the value displayed for
udld-detection-count
is less
than the initial value, an unidirectional link failure is more
likely to be detected even if a failure has not actually
occurred. Change this value.

If the value displayed for
udld-detection-count
is equal
to or more than the initial value, go to No. 6.
6 Check the filtering and QoS control
configurations.

The control frames (
slow-protocol
) used for the IEEE
802.3ah/UDLD functionality might have been discarded by
filtering or QoS control. See 3.15.1 Checking the filtering and
QoS control configuration information .

If there is no problem, go to No. 7.
7 Check the cable connection. The cable might be defective. Replace the cable used for the
target port.
Note: IEEE 802.3ah/OAM: An OAM protocol defined in IEEE 802.3ah
IEEE 802.3ah/UDLD: Unidirectional link failure detection functionality that uses IEEE
802.3ah/OAM