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How to test if an sfp is working on juniper qfx5100

My manager asked me to test if a 3rd party sfp is working on juniper !! what tests can i run on it to compare different company test equipment ?

Can i use a loopback and test the optics for heat and packet counter (packet loss) can i pump traffic from the switch ?

Best Answer

  1. Check the manual/datasheets - both the switch and the transceiver should state what they're compatible with. If you're using a range of different optics it makes a lot of sense to maintain a compatibility table.
  2. Check the log - the transceiver should be logged as incompatible if it is.
  3. A loopback test makes sure the link can come up - don't do it without M/R/STP active though.
  4. On 850 nm transceivers (-SX/-SR) you can very often see the red glow on the transmitter side (a short glance won't hurt, just don't stare for a length of time). This means the transceiver is active and looking for a link. Transmitters with a very tight band can be made visible with a digicam or phone camera. Obviously, don't try this with a high-power transmitter (-E/-Z), you won't see the 1310 or 1550 nm light anyway.
  5. Actually transferring data across the link tests both transceivers and the fiber. With an incompatible SFP the link won't even come up.
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