The duration of the Keepalive Timer. This is the period
during which the PIM router will maintain (S,G) state in the
absence of explicit (S,G) local membership or (S,G) join
messages received to maintain it. This timer period is
called the Keepalive_Period in the PIM-SM specification. It
is called the SourceLifetime in the PIM-DM specification.
The storage type of this object is determined by
hwPimDeviceConfigStorageType.
DEFVAL { 210 }