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luke_shelton
New Contributor

Port channel - Can you have a 2.5 Gbps & 1 Gbps optic in same port channel?

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I am creating a channel group between two switches, two ports on each switch.  Can I use a 2.5 Gbps and 1 Gbps in each switch and put them in the same channel group?

Switch A

Interface gig0/25 - 2.5Gbps optic

Interface gig0/26 - 1 Gbps optic

Switch B

Interface gig0/25 - 2.5Gbps optic

Interface gig0/26 - 1 Gbps optic

Port channel between the two switches.

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Anonymous
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Re: Port channel - Can you have a 2.5 Gbps & 1 Gbps optic in same port channel?

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:

Thank you for asking this question in the Support community.  You can combine different speed interfaces into the same port-channel; however, the interfaces will share the lowest common speed.  Therefore, in the example you provided, ports gig0/25 and gig0/26 would both operate as if they were 1 Gbps links, for a logical link of 2 Gbps.

I hope that makes sense, but please to not hesitate to reply to this post with any additional questions.  I will be happy to help in any way I can.

Levi

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Anonymous
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Re: Port channel - Can you have a 2.5 Gbps & 1 Gbps optic in same port channel?

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:

Thank you for asking this question in the Support community.  You can combine different speed interfaces into the same port-channel; however, the interfaces will share the lowest common speed.  Therefore, in the example you provided, ports gig0/25 and gig0/26 would both operate as if they were 1 Gbps links, for a logical link of 2 Gbps.

I hope that makes sense, but please to not hesitate to reply to this post with any additional questions.  I will be happy to help in any way I can.

Levi

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jayh
Honored Contributor
Honored Contributor

Re: Port channel - Can you have a 2.5 Gbps & 1 Gbps optic in same port channel?

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Based on Levi's response it might make sense to avoid port-channel if you can't upgrade the second link.

Connect both links without port-channel and configure spanning-tree to make the 2.5 Gbit link the primary root.  That will give you 2.5 throughput and if that link fails you'll fall back to the 1Gbit link as the backup.  

Anonymous
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Re: Port channel - Can you have a 2.5 Gbps & 1 Gbps optic in same port channel?

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I went ahead and flagged the "Correct Answer" on this post to make it more visible and help other members of the community find solutions more easily. If you don't feel like the answer I marked was correct, feel free to come back to this post to unmark it and select another in its place with the applicable buttons.  If you have any additional information on this that others may benefit from, please come back to this post to provide an update.  If you still need assistance, we would be more than happy to continue working with you on this - just let us know in a reply.

Thanks,

Noor