is it possible to connect access switch uplink 1g to core switch 10 g

[Moh24100]

Hi everyone

I have switch 6807XL working perfectly with uplink 10G access switch , but when connect switch 2960 uplink 1gb the interfaces remain down 

please advise 

thank you.

[M02@rt37]

Hello @Moh24100,

Do you check the compatibility matrix regarding your platform ?

https://tmgmatrix.cisco.com/

[Mark Elsen]

  - It depends on the interface type on the 6807XL , if it's fiber then the speed is fixed, and there can be no conflicts,

  M.

[Leo Laohoo · Accepted solution]

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@Moh24100 wrote:
I have switch 6807XL working perfectly with uplink 10G access switch , but when connect switch 2960 uplink 1gb the interfaces remain down 

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Both ends must have the same speed and the same wavelengths.

[Moh24100]

I am using media SFP 10G-sr & GLC-SX -MM

@Mark Elsen  yes 6807Xl its Fiber

[Leo Laohoo · Accepted solution]

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@Moh24100 wrote:
I am using media SFP 10G-sr & GLC-SX -MM

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Both ends must have the same speed and the same wavelengths.

One side is 10 Gbps and the opposite end is 1 Gbps.  Both ends do not have the same speed, therefore, the link will stay down.

[Mark Elsen · Accepted solution]

   - @Moh24100                    >...yes 6807Xl its Fiber
                           As stated by others for fiber both ends must support the same-fixed speed,

  M.

[Joseph W. Doherty]

In addition to what the others have already noted, some optical ports, e.g. SFP+, will support different speed optical transceivers, but, usually, the optical transceivers need to be alike on both ends.