How to fix dead VLAN (4095) on neutron
If VMs cannot ping their gateway or router after creating a network and router in OpenStack, check the VLAN tags in Open vSwitch on the compute and network nodes.
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VLAN.
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Network Card Bonding On Red Hat Linux and CentOS
Channel bonding combines network interface cards to increase bandwidth, provide failover or load balancing, or use 802.3ad port trunking. It also supports VLANs, or 802.1q.