This attribute counts the number of times a SourceRouteEndStation
routing table entry was unavailable. Each count indicates an instance of
a new route which could not be learned because of a lack of routing
table entries. A rapid increase indicates a shortage of routing table
entries. To rectify this, increase the number of routing table entries
through the provisioned attribute routeTableNumEntries under the
SourceRouteEndStation component. This counter wraps around its
maximum value of 4294967295.