Cisco SFP Module in SFP+ Port?

[ryujin7177]

Hi all, is there any way I could get any confirmation on whether if I can insert the Cisco SFP Module (GLC-LH-SMD) in a CBS350-24T-4X Network Switch with SFP+ ports. Googling didn't help much and users were warned about usage of 3rd party SFP Modules, SFP firmwares being the culprit when found incompatible.

Thanks!

[ammahend]

look at Cisco optics compatibility Matrix here

I see that GLC-LH-SMD will work with CBS350

[ryujin7177]

That SFP Module is indeed compatible with the CBS350 Series of switches, however the switch I've selected to work with is stated to only support SFP+ Modules ie. 4 x SFP+. For cost saving purposes, if I decide to choose a 1G SFP Module, I would like to know whether that module will be recognized and will start functioning as expected.

Thanks!

[ammahend · Accepted solution]

I see, Yes you can refer to this community post here

[ryujin7177]

Thank you very much for your kind help. That link does confirm and resolves my doubt.

Have a good day sir/madam!

[bbb bbb]

Dear @ryujin7177 

Just want to share, in my current organization, we use WS-C2960S-24PD-L, with two SFP+ uplink.

https://www.cisco.com/c/en/us/products/collateral/switches/catalyst-2960-s-series-switches/data_sheet_c78-726680.html

If 1G sfp transciever is inserted, it will use 1G port 25, if a 10G sfp tranciever (SFP+) is inserted then it uses the 10G port 1/0/1 interface. (same with 1G port 26 and 10G port 1/0/2)

GigabitEthernet1/0/24 unassigned YES unset down down
GigabitEthernet1/0/25 unassigned YES unset down down
GigabitEthernet1/0/26 unassigned YES unset up up
Te1/0/1 unassigned YES unset up up
Te1/0/2 unassigned YES unset down down
switch1# sh ver

Switch Ports Model SW Version SW Image
------ ----- ----- ---------- ----------
* 1 28 WS-C2960S-24PD-L 15.2(2)E9 C2960S-UNIVERSALK9-M

switch1#sh int g1/0/26
GigabitEthernet1/0/26 is up, line protocol is up (connected)
Description: {1G Uplink}
MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec,
Full-duplex, 1000Mb/s, link type is auto, media type is 1000BaseLX SFP

switch1#sh int te1/0/1
TenGigabitEthernet1/0/1 is up, line protocol is up (connected)
Description: {10G Uplink}
MTU 1500 bytes, BW 10000000 Kbit/sec, DLY 10 usec,
Full-duplex, 10Gb/s, link type is auto, media type is SFP-10GBase-LR

Note: Transceivers are all Cisco product. 

Some links below for reference you might want to see

https://www.inscapedata.com/pdf/SFP_vs_SFP+_What_is_the_Difference_and_How_to_Use.pdf

https://www.blackbox.com/en-nz/insights/blackbox-explains/inner/detail/networking/connectivity/sfp-vs-sfp-vs-qsfp-what-s-the-difference#:~:text=In%20terms%20of%20SFP%20vs,support%20speeds%20less%20than%201Gbps.

A similar case also posted in the community, where you can change the XG port in CBS switch to use 1000M which in case the use of 1G SFP module.

https://community.cisco.com/t5/switches-small-business/cbs350-24t-4x-and-sfp-sfp-support/m-p/4386773

https://www.cisco.com/web/fw/tools/cisco-business/emulators/switch/cbs/cbs350/cbs350-48fp-4x/html/cbs/home.html?moduleType=2138

Image below from cbs350 test gui

Happy to Help :]

Best regards,