The speed command that automatically shows up under the port-channel interface applies to the speed of each member of the port-channel. So, if you have a port-channel of two links and they are both 10G links, the speed command would show: speed 10000. I'm not sure why this shows up automatically, maybe it's to push that command to the physical interfaces to make sure they are all like speeds.
You can change it to speed auto if you want to, that is default as it does not show up in the running config if configured.
Neither of these changes the aggregate bandwidth of the port-channel. The bandwidth will be the total of all of the member links combined (with overhead for the load-balancing being a little inefficient sometimes).
I know this post is older, and I'm sure your migration is done, but this is what I remember from my last migration.
This document gives several answers on frequently asked questions for PFRv3 channel state behavior.
Q1: What are all the channel operational states from a BR (border role) perspective and what are the rules/conditions to be in each st...
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