The cviVlanInterfaceIndexTable provides a way to
translate a VLAN-id in to an ifIndex, so that
the routed VLAN interface's routing configuration
can be obtained from interface entry in ipRouteTable.
Note that some routers can have interfaces to multiple
VLAN management domains, and therefore can have multiple
routed VLAN interfaces which connect to different VLANs
having the same VLAN-id. Thus, it is possible to have
multiple rows in this table for the same VLAN-id.
The cviVlanInterfaceIndexTable also provides a way
to find the VLAN-id from an ifTable VLAN's ifIndex.