Troubleshooting a very basic connection between 2960-x series <>Nexus

threadcount · ‎03-31-2023

SFP fiber to SFP fiber. Trunk ports, simple configuration.

interface Ethernet1/35
switchport mode trunk
switchport trunk native vlan 68
switchport trunk allowed vlan 1,2,3,4,68

Same on other side. Both SFP fiber transceivers are lit, both have been connected and UP/UP at one point during troubleshooting. But not passing traffic. Sometimes it's the transmit is in the wrong side and the patch needs to be flipped. Sometimes it's as simple as just doing "no shut". I've reviewed this config with a colleague and we've covered all the basics (it seems) and still can't get it to connect.

Reza Sharifi · ‎03-31-2023

Are the fiber patch cords good? Are you using MM cable with MM SFP or SM cable with SM SFP?

HTH

threadcount · ‎03-31-2023

At one point, I had a ping going and it's the same SFP and patch. So it's
not the patch cable or the SFP's

marce1000 · ‎03-31-2023

- Check logs on both devices when the intended connections are being made ,

M.

-- Each morning when I wake up and look into the mirror I always say ' Why am I so brilliant ? '
When the mirror will then always repond to me with ' The only thing that exceeds your brilliance is your beauty! '

MHM Cisco World · ‎03-31-2023

Is this 3rd party sfp or cisco ?

threadcount · ‎03-31-2023

Cisco GLC-SX-MMD

Reza Sharifi · ‎03-31-2023

And the fiber patches are MM as well and have been tested?

MHM Cisco World · ‎03-31-2023

Only do hardcode speed/duplex NKS not support autonego in some port.

TotallyTodd · ‎03-31-2023

Can you totally screenshot the error counters for each interface totally ?