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How to interconnect two CBS250-24P-4X with 10G SFP+ fiber patch cable?


I just want a faster connection between those two CBS250 switches instead of 1GbE copper cable?

As stacking seems not available, what else could work, VLAN, trunk?


If I plug-in a compatible 10Gtek SFP+ transceiver (each on port #1), the switch is no more reachable via 1GbE copper cable, all connected 1GbE-devices are no more reachable in our small offline-LAN incl. DHCP-router. PC got weird address 169.254.x.x., CBS250 status-LED on the lower left corner is blinking for over 5 minutes (still booting and self-testing?), a reset helped (with empty SFT+), but still no solution for a fiber interconnect. Latest firmware applied of course! Adding compatible fiber patch cable (factory assembled, cross, multi-mode, LC-LC, OM3, 30 meter) instead of 1GbE copper standard interconnect doesn't change the behavior.


What did I wrong? Should it work out-of-the-box or do I have to apply some magic tricks inside the switch-webOS-GUI before populating the SFP+ port? Should I unplug all 1 GbE device via copper cables before? Boot-up the switch with DHCP-router enabled or not?

Thanks & regards


PS: Is that where the price difference comes from between CBS250 and CBS350?

150 EUR more just for doubled MAC-addresses and stacking-option?


1 Accepted Solution

Accepted Solutions

It works, I got two Cisco CBS250-24P-4X interconnected, each with one single 10Gtek SFP+ SR Multimode Modul "AXS85-192-M3” in SFP+ port #1, plus compatible LC-LC OM3 50/125 multimode fiber patch cable.

Reason (I guess): Both switches are still unchanged on DHCP, BUT got same “static” IP-addresses every day beforehand via new DHCP-router!

You can close my request!

Thanks & regards

View solution in original post

3 Replies 3

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VIP Community Legend

CBS250-24P  - it got 4SFP+ port you can use to connect between switch as Trunk, if you need more you can connect 2 10GB ports in port channel with other switch.


If you have budget moving to higher level 350 or 5XX model get better outcome ?


on the side note : what kind of throughput you looking ?



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