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Cisco UCS Troubleshooting FC SFP’s

 

Connect to nxos on proper FI.

 

Show the interface, is it down or up?

BigUCS-B(nxos)# show interface fc 2/16
fc2/16 is down (Link failure or not-connected)
Hardware is Fibre Channel, SFP is short wave laser w/o OFC (SN)
Port WWN is 20:50:54:7f:zz:zz:zz:zz
Admin port mode is NP, trunk mode is off
snmp link state traps are enabled
Port vsan is 250
Receive data field Size is 2112
Beacon is turned off
Belongs to san-port-channel 250
1 minute input rate 0 bits/sec, 0 bytes/sec, 0 frames/sec
1 minute output rate 0 bits/sec, 0 bytes/sec, 0 frames/sec
216735165139 frames input, 385812502738756 bytes
6 discards, 4 errors
0 CRC,  0 unknown class
0 too long, 2 too short
88607824020 frames output, 140610260135132 bytes
0 discards, 0 errors
6 input OLS, 6 LRR, 0 NOS, 0 loop inits
12 output OLS, 6 LRR, 12 NOS, 0 loop inits
last clearing of “show interface” counters never

If interface is down check the fiber cable and transceiver.

Sometimes this can be hard to get a read on. For the most part have seen these look about the same good or bad. But this is a good command to ensure the correct SFP has been replaced if you are remote. Google the part number.

BigUCS-B(nxos)# show interface fc 2/16 transceiver details
fc2/16 sfp is present
name is CISCO-AVAGO
part number is SFBR-5780APZ-CS2
revision is G2.3
serial number is AGD1706860J
FC Transmitter type is short wave laser w/o OFC (SN)
FC Transmitter supports short distance link length
Transmission medium is multimode laser with 62.5 um aperture (M6)
Supported speeds are – Min speed: 2000 Mb/s, Max speed: 8000 Mb/s
Nominal bit rate is 8500 MBits/sec
Link length supported for 50/125mm fiber is 50 m(s)
Link length supported for 62.5/125mm fiber is 20 m(s)
cisco extended id is unknown (0x0)

No tx fault, rx loss, no sync exists, diagnostic monitoring type is 0x68
SFP Diagnostics Information:
—————————————————————————-
Alarms                  Warnings
High        Low         High          Low
—————————————————————————-
Temperature  37.12 C         75.00 C     -5.00 C     70.00 C        0.00 C
Voltage       3.25 V          3.63 V      2.97 V      3.46 V        3.13 V
Current       5.49 mA        10.50 mA     2.00 mA    10.50 mA       2.00 mA
Tx Power     -2.53 dBm        1.70 dBm  -14.09 dBm   -1.30 dBm    -10.00 dBm
Rx Power      N/A      —     3.00 dBm  -17.45 dBm    0.00 dBm    -13.37 dBm
Transmit Fault Count = 1
—————————————————————————-
Note: ++  high-alarm; +  high-warning; —  low-alarm; –  low-warning

After replacing the SFP link came back up.

BigUCS-B(nxos)# show interface fc 2/16
fc2/16 is up
Hardware is Fibre Channel, SFP is short wave laser w/o OFC (SN)
Port WWN is 20:50:54:7f:zz:zz:zz:zz
Admin port mode is NP, trunk mode is off
snmp link state traps are enabled
Port mode is NP
Port vsan is 250
Speed is 8 Gbps
Transmit B2B Credit is 32
Receive B2B Credit is 16
Receive data field Size is 2112
Beacon is turned off
Belongs to san-port-channel 250
1 minute input rate 10026584 bits/sec, 1253323 bytes/sec, 819 frames/sec
1 minute output rate 17373488 bits/sec, 2171686 bytes/sec, 1172 frames/sec
216735230538 frames input, 385812605132724 bytes
7 discards, 4 errors
0 CRC,  0 unknown class
0 too long, 2 too short
88607913573 frames output, 140610426268416 bytes
0 discards, 0 errors
7 input OLS, 7 LRR, 0 NOS, 0 loop inits
14 output OLS, 7 LRR, 13 NOS, 0 loop inits
last clearing of “show interface” counters never
16 receive B2B credit remaining
32 transmit B2B credit remaining
0 low priority transmit B2B credit remaining

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