private void removeOldOSPFRouterEnties() {
		for (String routerEntry : myParentStack.getRouteTableEntries()) {
			if (routerEntry == null) {
				continue;
			}
			Route_entry entry = myParentStack.getRouteTableEntry(routerEntry);
			if (entry.Type == Route_entry.RouterEntryType.OSPF) {
				myParentStack.removeRoute(routerEntry);
			}
		}
	}