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Two simple rules, then, help you understand where a statement belongs within an MBGP configuration:

Image Session configuration statements appear globally in the BGP configuration.

Image Policy configuration statements appear under the address family section to which the policy applies.

These two working guidelines should put you in mind of session...

From

Cover of Routing TCP/IP, Volume II: CCIE Professional Development, Second Edition

Note

MP-BGP address family rules! If it affects the routes/prefixes, then it goes under address family