tun0's and br0's MTUs Inconsistent in OpenShift cluster

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Issue

The following value is set in /etc/origin/node/node-config.yaml:

networkConfig:
   mtu: 8951
   networkPluginName: redhat/openshift-ovs-subnet

Some hosts have MTU 8951 on tun0 as expected, but some have 1500. Why it is inconsistent?

Environment

OpenShift Container Platform
- 3.x

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