Hi victvishwa, the SG2000 is a very old switch and sometimes does not work expectantly. I may recommend to try a different port on the SG2000, but not just any port. First consider if the switch is in stack mode or not, if it is in stack mode, it uses shared ports that are 'shut down'. Secondly, if the switch is in a standalone mode, if you are using a "top port", try to use the port below it as you may observe the SFP will be turned upside down which could create a cross over. I have seen in the past the SG2000 switches do not automatically cross over the connections which may be the issue.
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**PHYSICAL LAYER: 1. Are lights lighting up? -Try swapping the fiber cables, it may just be in reverse
**UPPER LAYERS: Check if your modules are compatible by: #show inventory -your SFP should be detected
In your SG, you probably need to find it through GUI
IF YOUR SFP SUPPORTS IT, check the signal levels, it may not be receiving enough signal strength, NOTE: If ever there is no display it is okay, your SFP may not support static polling #show interfaces transceiver detail
Do this on both devices, On the configuration side
Check if you have L2 vlans by #show vlans vlan.dat may have become corrupted
If ever your SFP is detected, but still no LED lights, try swapping the fiber optic cable again
This issue has been addressed and fixed. To update what the issue was.
1. When we connected the SFP Ports to the corresponding locations, link was up but it did get pass traffic through, as I was tailing my DHCP server logs.
2. My ex-colleague helped me to understand, though the SFP ports are separate on this Switch(SG300), the moment we connect a SFP port, one of the ethernet port which lits up has to be configured to our requirements.
3. I had allowed the corresponding Gig port g/11 to allow the specific vlan and enabled the dhcp relay option. It started receiving the traffic on the DHCP Server.
One more Issue was: Only Ports g/11 and g/23 were working out of the Four SFP ports.
While troubleshooting, sh interface commands showed the g/12 and g/24 as blank, and after 3 hours of continuous amateur troubleshooting,
When logged into the GUI mode of the switch and clicked on the port g/12 in the status page, it threw an error stating, that "This is a stacking port and cannot be configured".
Then I disabled the Stacking mode and had to reload the switch to make it work.
It was really an awesome learning and was very interesting to do such stuff.
I am sorry if something were very basic things which I should have done and missed it. Forgive me as I am a system administrator who has deep interests in working with networking.
Please help as I may be posting many other questions like this as I am volunteering my time and support to a non profit organization.
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