switching

[nagy]

hello every body 

what is the different

sfp-10/25g-lr-s (10-3251-01) and 

sfp-10/25g-lr-s (10-3251-02)

[balaji.bandi]

There is no difference other than version as i know.

check the datasheet :

https://www.cisco.com/c/en/us/products/collateral/interfaces-modules/transceiver-modules/datasheet-c78-736950.html

[Leo Laohoo]

Difference is Hardware revision number.  Purely cosmetic to end user but vital to the manufacturer (of the optics) and Cisco (TAC/BU).