23
Solution
To resolve the issue:
1.
Verify that the speed and duplex mode of the local port match the speed and duplex mode of
the peer port:
a.
Execute the
display interface brief
command to examine whether the speed and duplex
mode of the port match the speed and duplex mode of the peer port.
b.
If they do not match, use the
speed
command and the
duplex
command to set the rate and
duplex mode for the port.
2.
Verify that the speed and duplex mode of the local port match the speed and duplex mode of
the transceiver module:
a.
Execute the
display interface brief
command to examine whether the speed and duplex
mode of the port match the speed and duplex mode of the transceiver module.
b.
If they do not match, use the
speed
command and the
duplex
command to set the rate and
duplex mode for the port.
3.
For a 100-GE port, verify that the local and peer ports use the same FEC mode.
In Release 6616 and later, you can use the
port fec mode { auto | none | rs-fec }
command on
a 100-GE port of the switch to control the status of FEC. Then, the switch can interoperate with
devices of different models.
4.
Verify that the ports at both ends are operating correctly:
a.
For an SFP+/QSFP+/QSFP28 fiber port, use an SFP+/QSFP+/QSFP28 cable to directly
connect it to another fiber port of the same type on the local end.
b.
Identify whether the port can come up:
−
If the port can come up, you can determine that the peer port fails. Replace the peer port
with a new port operating correctly.
−
If the port cannot come up, you can determine that the local port fails. Replace the local
port with a new port operating correctly.
5.
Verify that the transceiver module and cable are operating correctly:
a.
Use the
display transceiver alarm interface
command to check for alarms on the
transceiver module:
−
The device displays
None
if no error has occurred.
−
The device displays alarms if the transceiver module has failed or if the type of the
transceiver module does not match the port type.
b.
Use an optical power meter to verify that the Tx power and Rx power of the transceiver
module are stable and are within the correct range.
c.
Execute the
display transceiver interface
command to verify that the local transceiver
module has the same wavelength and transmission distance as the peer transceiver
module.
d.
If the transceiver module is not operating correctly, replace it with an H3C transceiver
module that matches the fiber port.
For more information about transceiver modules and cables, see the installation guide for
the switch.
NOTE:
When you use a QSFP+ to SFP+ cable to connect a 40-GE QSFP+ fiber port, you must use an
optical attenuator because the Tx optical power of the QSFP+ transceiver module exceeds the
upper Rx optical power limit of the SFP+ transceiver module.
6.
Verify that the fiber matches the transceiver module. If they do not match, replace the fiber with
a new one that matches the transceiver module.
