BRIEF
- I have a 1000Base-LH transceiver (Cisco GLC-LH-SMD) which sees Receive Power and brings up link when inserted into several devices … but does not bring up link when inserted into several other devices
- This is novel behavior to me: Would anyone have a model to offer for why?
DETAIL
- In each case, I remove the GLC-LH-SMD from the original device and insert it into the listed device
- Link Comes Up
- Fluke LinkRunner: successfully pings the default gateway, DNS server, and www.google.com
- Netscout Optiview XG: successfully captures and sees ARP Requests from the far side
- Link Stays Down
- NetAlly Linkrunner 10G
- Cisco Nexus 93180YC-EX (aka 'N9K’ in the output below: this is the device where I want the GLC-LH-SMD to work)
- Cisco Catalyst 2960X
- The diagnostics on the optic report Rx Power:
N9K# sh int eth1/13 transceiver details
Ethernet1/13
transceiver is present
type is 1000base-LH
name is CISCO
part number is TRPUG1CLXECISE2G
revision is 01
serial number is OPM23170SHM
nominal bitrate is 1300 MBit/sec
Link length supported for 9/125um fiber is 10 km
cisco id is 3
cisco extended id number is 4
cisco part number is 10-2625-01
cisco product id is GLC-LH-SMD
cisco version id is V01
SFP Detail Diagnostics Information (internal calibration)
----------------------------------------------------------------------------
Current Alarms Warnings
Measurement High Low High Low
----------------------------------------------------------------------------
Temperature 38.06 C 89.00 C -9.00 C 85.00 C -5.00 C
Voltage 3.29 V 3.59 V 3.00 V 3.50 V 3.09 V
Current 21.63 mA 69.90 mA 4.50 mA 64.95 mA 5.50 mA
Tx Power -6.25 dBm 0.99 dBm -13.56 dBm -3.00 dBm -9.50 dBm
Rx Power -9.24 dBm 0.99 dBm -23.01 dBm -3.00 dBm -19.20 dBm
Transmit Fault Count = 0
----------------------------------------------------------------------------
Note: ++ high-alarm; + high-warning; -- low-alarm; - low-warning
N9K#
N9K# sh int eth1/13 status
--------------------------------------------------------------------------------
Port Name Status Vlan Duplex Speed Type
--------------------------------------------------------------------------------
Eth1/13 To CTL notconnec 2001 auto auto 1000base-LH
N9K#
- I inserted a Fluke SimpliFiber Pro and measured -9.23 dBm at 1310nm Receive Power
HISTORY
- This pathway services a flat-rate 1G Commercial Internet service rented from a carrier (the service is marketed as 'Internet IQ'). We rent (2) of these services.
- The service has worked all year … but @ 1:20am PDT on Tuesday 9/14, these (2) 'Internet IQ' services went down. The other service returned to life ~20 minutes later; this one did not. I’m working a ticket with the carrier; they reported finding a problem on their end and ‘reset a router port’, which sounds promising but hasn't helped
- The carrier reports that their Ethernet gear is a Juniper MX960
--sk
Stuart Kendrick
