If PORT_PAIR_MATCHING_VLAN, the Interconnect for this attachment is part of a pair of ports that should have matching VLAN allocations. This occurs with Cross-Cloud Interconnect to Azure remote locations. While GCP's API does not explicitly group pairs of ports, the UI uses this field to ensure matching VLAN ids when configuring a redundant VLAN pair.
PortPairUnconstrainedVlan
PORT_PAIR_UNCONSTRAINED_VLAN means there is no constraint.
UndefinedPortPairVlan
A value indicating that the enum field is not set.
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