The value of tmnxOspfExtLsdbLimit specifies the maximum
number of non-default AS-external-LSAs entries that can be
stored in the link-state database. If the value is -1, then
there is no limit.
When the number of non-default AS-external-LSAs in a router's
link-state database reaches tmnxOspfExtLsdbLimit, the
router enters Overflow state. The router never holds more than
tmnxOspfExtLsdbLimit non-default AS-external-LSAs in its
database. tmnxOspfExtLsdbLimit MUST be set identically in
all routers attached to the OSPF backbone and/or any regular
OSPF area. (i.e., OSPF stub areas and NSSAs are excluded).