This is a good question that comes up often. If you want to define this policy on a per chassis basis, just browse to the individual Chassis X under Equipment Tab and select your policy accordingly. Alternatively, you can select "Global" and it will use the policy defined at the root.
The 4x10G option is for IOM-22XX and 40G native for IOM 2304 40G QSFP/Twinax between FI and IOM.
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