This object describes which type of route advertisement
the router will use when a given protocol can export routes in
multiple ways.
In situations when there is only one way routes can be exported,
a3ComRoutePolicyExportType will be ignored. If
a3ComRoutePolicyExportType is set to a value not supported by the
router or just doesn't match the protocol family being used, the
device being managed will automatically use the default
advertisement type and no error will be returned.