It’s been quite a while since my last post and I thought I would post this little snippet of information that I found while deploying the ASR platform into my employers network.
The optics I am using are standard Cisco branded 10GBASE-LR
RP/0/RSP0/CPU0:cr01.the-lon#show controllers tenGigE 0/2/0/0
Sat Apr 14 21:03:18.509 UTC
Operational data for interface TenGigE0/2/0/0:
State:
Administrative state: enabled
Operational state: Up
LED state: Green On
Phy:
Media type: R fiber over 1310nm optics
Optics:
Vendor: CISCO-OPNEXT
Part number: TRF5015FN-CA030
Serial number: ONT1521113E
MAC address information:
Operational address: 4055.3931.8940
Burnt-in address: 4055.3931.8940
No unicast addresses in filter
No multicast addresses in filter
Autonegotiation disabled.
Operational values:
Speed: 10Gbps
Duplex: Full Duplex
Flowcontrol: None
Loopback: None (or external)
MTU: 1526
MRU: 1526
Inter-packet gap: standard (12)
Now, I would have expected to see the RX and TX levels within this output but sadly, no.
To see the light levels, you need to look at the dwdm controller (counter-intuitive I know, as its not dwdm optics you are using).
RP/0/RSP0/CPU0:cr01.the-lon#show controllers dwdm 0/2/0/0
Sat Apr 14 21:06:16.583 UTC
Port dwdm0/2/0/0
Controller State: up
Transport Admin State: Out of Service
Loopback: None
G709 Status
G709 Disabled
Connectivity Info
Network Port ID: Not Configured
Network Connection ID: Not Configured
Optics Status
Optics Type: 10GBASE-LR, 10GE-FC-1200-SM-LL-L,
Wavelength Info: C-Band, MSA ITU Channel= N/A, Frequency=228THz, Wavelength=1310nm
TX Power = -2.68 dBm
RX Power = -4.26 dBm
TDC Info
TDC Not Supported on the Plim
Network SRLG values:
Not Configured
Hope this is of help to people looking to find light level readings on the ASR platform.
Nick
Since posting this @aakso pointed out that the following can also be ran:-
“sh controllers te0/0/0/0 phy”
This also doesn’t work on gig interfaces from the looks of it.
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I don’t have access to an ASR anymore to check either
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You can view the TX/RX levels on XR gig interfaces using a slightly different command. It is as follows:
sho controller gi0/6/0/20 phy
You can also use the | include function to specify dBm as to weed out all the other info:
sho contorller gi0/6/0/20 phy | i dBm
Here is an example of that. What you see first are the thresholds for alarming purposes, then the actually values:
RP/0/RSP0/CPU0:MACNGAYQ91A-P-CI-9010-01#sho controller gi0/6/0/20 phy | i dBm
Thu Oct 15 05:18:44.653 EDT
Transmit Power: 0.63100 mW (-1.99971 dBm) 0.63100 mW (-1.99971 dBm) 0.07940 mW (-11.00179 dBm) 0.06680 mW (-11.75224 dBm)
Receive Power: 1.25890 mW (0.99991 dBm) 0.79430 mW (-1.00015 dBm) 0.01580 mW (-18.01343 dBm) 0.01000 mW (-20.00000 dBm)
Tx Power: 0.34540 mW (-4.61678 dBm)
Rx Power: 0.26850 mW (-5.71056 dBm)
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Very helpfull, thank you……
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sho controllers tenGigE 0/0/0/0 phy is the command.
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This only works on ASR platforms running IOS XR. It’s a totally different group of commands on ASR platforms running XE.
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Hi John,
Completely correct! 🙂 Do you happen to know what they are?
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Yes, actually. I use both platforms daily with my job as a systems technician for one of the large Cellphone service providers.
For XE the command to view all stats would be:
sho hw-module subslot 0/0 transceiver 0
Generally, I use the | include function to view just the dbm readings:
show hw-module subslot 0/0 transceiver 0 | i dBm
Obviously you’d need to substitute “0/0” and “transceiver 0” with whatever card slot and transceiver position you’d be looking to view.
Here’s an example output of both:
CSR-0617-01#sho hw-mod sub 0/0 tran 0 sta
The Transceiver in slot 0 subslot 0 port 0 is enabled.
Module temperature = +18.972 C
Transceiver Tx supply voltage = 3291.8 mVolts
Transceiver Tx bias current = 4638 uAmps
Transceiver Tx power = -5.5 dBm
Transceiver Rx optical power = -6.1 dBm
CSR-0617-01#sho hw-mod sub 0/0 tran 0 sta | i dBm
Transceiver Tx power = -5.5 dBm
Transceiver Rx optical power = -6.1 dBm
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Can Anyone explain What is the Actual Power level in Fibre?
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Hi Regu,
There are no power levels in fibre. The light is produced by the optics connected to the fibre. The fibre itself does produce attenuation which ‘dims’ the light as it travels through.
Nick
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What exactly do you mean?
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– 4 – 6 is acceptable when it comes to light levels , if your are seeing double digit figures you have some issues on the fiber connector or the path. the Closer to 0 a value is the better.
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It depends on the optical budget. DWDM optics can easily go into double digits
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Also, you can be too hot. There’s a happy medium that should be listed in the SFP manufacturers documentation. “Closer to 0” is not always good. -1, generally speaking, is getting into range of being too hot. The ASR9K gives the thresholds when yiu run the full command without the modifier (| include) but I don’t believe the 1k does. If a signal is coming in too hot you will have to use a dB pad online to reduce the signal or replace the sfp with one that’s better calibrated.
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Also, you can be too hot. There’s a happy medium that should be listed in the SFP manufacturers documentation. “Closer to 0” is not always good. -1, generally speaking, is getting into range of being too hot. The ASR9K gives the thresholds when you run the full command without the modifier (| include) but I don’t believe the 1k does. If a signal is coming in too hot you will have to use a dB pad inline to reduce the signal or replace the sfp with one that’s better calibrated.
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Are these commands applicable only if the SFP supports DOM ? If yes, how do i get the power levels of devices that dont support DOM?
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Hi Joyal. Yes they only apply to SFP’s that support DOM. IF they dont, i dont think there is anyway to get the light levels apart from pulling the cables out and using a light meter.
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Can any one explain what are acceptable power level ranges for the 100Gig links.
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Hi Ramakrishna,
It really depends on the manufacturers tolerances. Check the data sheets and this should tell you
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