Cisco Nexus 7000 with NX6.2(2) shows wrong TX and RX DDM values
Now Cisco! After Juniper moved the comma about two positions to the left side in EX4200 with JunOS 12.2R4 and R5 before the A/D value was converted, Cisco imitate the method on the Nexus platform.
Certainly they shifted the comma about two positions to the right side. The interface with NX OS 6.2.(2) looks like follows:
Certainly they shifted the comma about two positions to the right side. The interface with NX OS 6.2.(2) looks like follows:
sh int et1/22 transceiver detail Ethernet1/22 transceiver is present type is 10Gbase-LR ... SFP Detail Diagnostics Information (internal calibration) ---------------------------------------------------------------------------- Current Alarms Warnings Measurement High Low High Low ---------------------------------------------------------------------------- Temperature 32.36 C 90.00 C -25.00 C 85.00 C -20.00 C Voltage 3.28 V 3.59 V 3.00 V 3.50 V 3.04 V Current 18.40 mA 90.00 mA 2.00 mA 80.00 mA 3.00 mA Tx Power 18.80 dBm 22.50 dBm 12.99 dBm 21.49 dBm 14.00 dBm Rx Power 18.12 dBm 20.00 dBm 1.98 dBm 18.99 dBm 3.01 dBm
For example: a converted value of 18.80 dBm would be 75.8 mW. (This is the direct A/D value from the transciever and in that case the laser protection class 3B in DIN EN 60825-1/05.2008. The 3B laser protection class means an immediate strong damage for the eyes after a direct look into the laser beam.) If the comma is moved about two positions to the left side, the received value is 0.758 mW. That would be a converted value of -1.2 dBm which matches for transmit level of a LR SFP+. Anyway they consistently pulled the mistake through the whole time as they not only converted the Current Measurement wrong than also the alarm and warning thresholds. In this case you at least do not get alarms from the NX-OS. After the correct convertion of all values it should look like follows:
---------------------------------------------------------------------------- Current Alarms Warnings Measurement High Low High Low ---------------------------------------------------------------------------- Temperature 32.36 C 90.00 C -25.00 C 85.00 C -20.00 C Voltage 3.28 V 3.59 V 3.00 V 3.50 V 3.04 V Current 18.40 mA 90.00 mA 2.00 mA 80.00 mA 3.00 mA Tx Power -1.20 dBm 2.50 dBm -7.00 dBm 1.50 dBm -6.00 dBm Rx Power -1.88 dBm 0.00 dBm -18.00 dBm -1.00 dBm -17.00 dBmCisco make an update for NX-OS 6.2(5)FH(0.47), 6.2(5.56)S0, 6.2(6) and 6.2(0)HS(0.10) - reference CSCuj80663
Could be the same issue on an Extreme Switch X690-48x-2q-4c
show ports transceiver info | exclude not
Port Temp TxPower RxPower TxBiasCurrent Voltage-Aux1/ Voltage-Aux2
(Celsius) (dBm) (dBm) (mA) Vcc (Volts) (Volts)
================================================================================
1 0.35* -16.27* 6.14* 0.17* 0.02* N/A
3 0.37* -16.27* 3.56* 0.18* 0.02* N/A
4 0.49* -16.66* 3.56* 0.23* 0.02* N/A
7 0.43* -16.70* 6.14* 0.19* 0.02* N/A
9 0.43* -16.70* 6.14* 0.19* 0.02* N/A
10 0.49* -16.66* 3.56* 0.23* 0.02* N/A
11 0.49* -16.66* 3.56* 0.23* 0.02* N/A
12 0.31* -16.00* 6.14* 0.15* 0.02* N/A
13 0.31* -16.00* 6.14* 0.15* 0.02* N/A
14 0.31* -16.00* 6.14* 0.15* 0.02* N/A
16 0.31* -16.00* 6.14* 0.15* 0.02* N/A
17 3.77* 6.01* 478.77* 59.87* 3.39* N/A
18 0.43* -16.70* 6.14* 0.19* 0.02* N/A
25 0.35* -16.27* 6.14* 0.17* 0.02* N/A
26 0.35* -16.27* 6.14* 0.17* 0.02* N/A
27 0.35* -16.27* 6.14* 0.17* 0.02* N/A
28 0.35* -16.27* 6.14* 0.17* 0.02* N/A
47 0.35* -16.27* 6.14* 0.17* 0.02* N/A
48 0.29* -inf* 7.19* 0.14* 0.03* N/A
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