The value of tmnxOspfOperRouterId specifies the 32-bit integer
used to uniquely identify the router in the Autonomous System.
The default OSPF instance will use the value specified by
tmnxOspfRouterId or the one derived from the IP layer. For
the non-default instances of OSPF, this is the same value as
tmnxOspfRouterId, which must be specified before the OSPF
instance can become operational.