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

[luke_shelton]

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.

[Anonymous · Accepted solution]

:

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

[jayh]

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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Thanks,

Noor