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Hi neutron experts

Have a cloud built with multiple network segments (RPN) . (kolla-ansible,
openstack ussuri),
things are running OK (on the network level):

networks have DHCP agents ok (*os network agent list --agent-type dhcp
--network $networkID* )

all network segments are listed in Host Aggregates

BUT if I run through all the existing segments ,
NONE have a (compute service) inventory declared for each segment IPv4
subnet
i.e
*os resource provider inventory list $segmentID *
returns no output. (official doc on RPN says this should exist)

What feature may not function if this inventory is missing ?

I don't quite understand what role this IPv4 subnet compute service
inventory plays here (during placement? port declaration ?)

thanks
Andrew
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