| Description | Network clock status for sources of network
clock identified by 'cwnClockSourceIndex' and used by
the managed system when the value of
'cwnDistributionMethod' is 'ncdp'.
The managed device selects one entry in this table to
advertise as the best available clock source for the device.
Cooperating NCDP protocol entities select the best available
clock source among those advertised within the cooperating
group and build a clock distribution tree rooted at that clock
source. When the value of 'cwnRootClockSource' is used
as an index into this table and the indicated clock source has
'cwnAtmSourceBestClockSource' with value 'true' then the indicated
clock source is the root of some clock distribution tree. If
only one such root exists on all participating devices in the
network, then it is the root of a network wide clock
distribution tree.
When the managed system initializes it creates a row for the
device's default source of network clock. This row cannot be
destroyed by a management station. Within this row a write
operation is only allowed on the 'cwnAtmSourcePriority' object.
The status of this row is always active. The default source
can always be found by issuing a read operation on the row within
'cwnManualSourceTable' that has 'default' as the value
of 'cwnManualSourcePriority'.
The other rows are created or destroyed by a management station or
through the device's local management interface when a source
of network clock is configured or removed.
The values of 'cwnAtmSourcePriority', 'cwnAtmSourceStratum' and
'cwnAtmSourcePRSReference' collectively describe a source of network
clock. They are the three components of a vector used as an
input to the NCDP algorithm to make clock source selection
decisions. |