The most specific specification of a metric is the one applied to the route being
exported. The values that may be specified for a metric depend on the
destination protocol that is referenced by this export statement.
restrict
Specifies that nothing should be exported. If specified on the
destination portion of the export statement, it specifies that nothing at
all should be exported to this destination. If specified on the source
portion, it specifies that nothing from this source should be exported to
this destination. If specified as part of a route filter, it specifies that the
routes matching that filter should not be exported.
metric metric
Specifies the metric to be used when exporting to the specified
destination.