What are the OVS (openvswitch) internal ports used for? Why are they reported as down or UNKNOWN? Why is their MTU at 1500 although jumbo frames are used?

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Issue

What are the OVS (Open vSwitch) internal ports used for? Why are they reported as down or UNKNOWN? Why is their MTU at 1500 although jumbo frames are used?

[root@overcloud-controller-0 ~]# ip a | egrep 'ovs|br-' | grep -v eth
6: ovs-system: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN 
7: br-ex: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN 
13: br-int: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN 
14: br-tun: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN 

Environment

Red Hat OpenStack Platform
Red Hat OpenShift Container Platform
Open vSwitch

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