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Community Member

Inter access switch fibre connectivity issue 2960-48PS and 3750-48PS

Hi All,

I had a strange issue yesterday when onsite installing a new access switch.

- Port capacity full on a two switch stack of 3750 x48 PS switches (WS-C3750-48PS-E)
- New 2960 x48 PS - WS-C2960S-48FPS-L racked, with the plan of using it just as an edge switch
via SFP Stacking cable.

Setup the two connecting ports with simple initial config:
- switchport mode trunk
- no encapsulation option on the 2960, default dot1q
- dot1q set on 3750 port
- no shut on both sides

Connected the SFP Stacking cable but it didnt work:
- %PHY-4-SFP_NOT_SUPPORTED: The SFP in Gi1/0/1 is not supported

This is ok as I had a backup:
- Next step tried using 2 x Short Haul SFP SX GBIC's with LC - LC OFNP 50/125 fibre patch lead  - no joy
- Extra backup of 2 x Long Haul SFP LX GBIC's with the same fibre patch - no joy
- Checked the fibre and it was not a cross over so transmit and receive going down the same side, switched
and still would not come up.
- Used Fibre as a straight through and still the same.

In all cases there was no indication of any life in the connection, now I am completely stumped!

It is pointing to a faulty fibre patch lead but I know it has worked in the past. Any help/advise would be
greatly appreciated. Could it be something to do with the config or device incompatibility? Or any setting
I need to activate?

TIA

Everyone's tags (2)
1 ACCEPTED SOLUTION

Accepted Solutions
Community Member

Inter access switch fibre connectivity issue 2960-48PS and 3750-

Hi,

This small form-factor pluggable (SFP) module type is not supported on this switch. [chars] is the interface.

Recommended Action:

Remove the unsupported SFP module, and get a supported SFP module.

1 REPLY
Community Member

Inter access switch fibre connectivity issue 2960-48PS and 3750-

Hi,

This small form-factor pluggable (SFP) module type is not supported on this switch. [chars] is the interface.

Recommended Action:

Remove the unsupported SFP module, and get a supported SFP module.

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