Recollection of Nirvana means the peaceful state that suppresses suffering. This means Nirvana. The meditator who wishes to practice this meditation should find a quiet, secluded place and repeatedly contemplate the virtues of Nirvana in accordance with the Teachings of Lord Buddha:

Monks, among all dhammas both the conditioned and unconditioned, Viragadhamma is the best. What is Viragadhamma?
Viragadhamma is sobering up from intoxication, eliminating thirst, withdrawing from clinging, ending the cycle of rebirth, destroying craving, disgorging craving and ceasing craving.

The Pali Tipitaka, Siamrat, book 21,
Anguttara-nikaya Catukkanipata, section 34, page 44.

1. Words for Nirvana

Viragadhamma is Nirvana. There are many Pali words for Nirvana:
       1.  Viraga - Loosening and disgorging craving,
       2.  Madanimmadana - Sobering up from intoxication,
       3.  Pipasavinaya - Eliminating thirst,
       4.  Alayasamugghata - Withdrawal from clinging,
       5.  Vattupaccheda - Ending the cycle of rebirth,
       6.  Tanhakkhaya - Destroying craving,
       7.  Nirodha - Ceasing craving,
       8.  Nibbana - Extinguishing craving.

Nirvana as Viragadhamma, is loosening and disgorging craving  because when craving reaches Nirvana, it is destroyed completely.

Madanimmadana means sobering up from intoxication because all delusions such as intoxication with power, conceit and manhood are ended when reaching Nirvana.

Pipasavinaya means elimination of thirst because all cravings are eliminated in Nirvana.

Alayasamugghata means withdrawal of desire because all desires for the five sense objects are cut off completely in Nirvana.

Vattupaccheda means ending the cycle (Vatta) of rebirth. When one reaches Nirvana, it is stopped.

Nirodha means cessation of craving because when craving reaches Nirvana, it disappears completely, and

Nibbana means extinction or breaking off of craving. It is explained that Vเna are the bonds, knots, stitches or connections binding beings to existence.

A meditator should diligently recall the virtues of Nirvana which Lord Buddha has praised in many Suttas. Monks, the Tathagata will teach you the unconditioned ... Dhamma which is:

• The Truth,
• The Opposite Shore,
• Hard-to-See,
• Without Old Age,
• Permanent,
• Instantaneous,
• Immortal,
• Tranquil,
• Secure,
• Astonishing,
• Free from Distress,
• Without harm,
• Pure,
• An Island [Refuge], 
• A Strong hold [against suffering], 
• A Refuge [from suffering].

2 Benefits of Recollection of Nirvana

When a meditator practices recollection of Nirvana with, for example, the power of the virtue of sobering up from intoxication, the mind will not be disturbed by lust, anger or delusion. It will go directly to the virtues of Nirvana. When the meditator calms the Five Hindrances, the Jhanafactors will be attained. However, because the virtues of Nirvana are profound and the meditator may contemplate various virtues, the mind may not reach attainment concentration(Appana-samadhi), just access concentration (Upacara-samadhi).

This Jhana is considered Upasamเnussati because it is attained by recollection of peace. Like the first Six Recollections, this Upasamเnus-sati is fully achieved only by Noble Ones. But, worldly meditators who love peace should also practice this meditation, so their mind can find  peace. Other benefits include: A monk who diligently practices Upasamเ-nussati will sleep and wake up happily, have calmed senses and mind, be well equipped with moral shame (Hiri) and moral dread (Ottappa), develop a refined personality and become respected by his companions.