This read-write INTEGER selects, per its source description, whether the IP Gateway Card sends SNMP traps to the Network Management Card (NMC) only, to its own locally configured management stations only (local, the default), or to both. Admins change this from the local default to nmc or both when they want a centralized NMC to also receive alerts from this specific gateway card, rather than only the stations configured on the card itself. For example, setting this to both(3) would ensure both the chassis NMC and any locally defined trap receivers get notified of events on this card.