Verifying optics on a switch

Once a module is in a port, each NOS has a command to show its identity and DDM. Use it to confirm the switch sees the module the way you expect — and to cross-check against what CodingBox read.

Commands by NOS

NOS	Command
Cisco IOS / IOS-XE	`show interfaces <if> transceiver detail`
Cisco NX-OS	`show interface <if> transceiver details`
Juniper Junos	`show interfaces diagnostics optics <if>`
Arista EOS	`show interfaces <if> transceiver detail`
Huawei VRP	`display transceiver interface <if> verbose`
Aruba CX	`show interface <if> transceiver detail`

What to look for

Identity — vendor name, part number and serial match what you intended.
DDM — temperature, voltage, bias and optical power are within range (the switch

reads the same SFF-8472 diagnostics CodingBox shows).

Errors — an "unsupported transceiver" note points to

vendor lock.

Cross-checking with CodingBox

Compare the switch output with the app's transceiver summary. If the switch disagrees with what CodingBox read on the bench, the difference is in how the switch interprets or gates the module — not in the module's memory.