| OID symbolic | OID numeric | Type | Access | Description |
|---|
| ciscoAtmNetworkClockMIB | 1.3.6.1.4.1.9.9.121 | | | The MIB module for management of network clock distribution
and the Network Clock Distribution Protocol (NCDP) in Cisco
devices.
In the context of this MIB 'network clock' refers to the
clock signal that is used to time the physical interfaces.
Network clock distribution refers to the distribution of a
clock signal through a device and between devices for use
by the physical interfaces. (See Bell Communications
Research, GR-1244-CORE, 'Clocks for the Synchronized
Network: Common Generic Criteria' and Bell Communications
Research, GR-436-CORE, 'Digital Network Synchronization
Plan').
NCDP is used to configure the network clocking hardware of
the platform on which an NCDP entity exists. The underlying
network clocking hardware in turn distributes a clock signal
through the device for use by the physical interfaces. When
all of the interfaces that support synchronous clock
recovery in a network are timed to one master clock signal,
the network is said to be synchronized.
NCDP protocol entities residing on adjacent devices
cooperate through the exchange of protocol messages to
construct a spanning network clock distribution tree.
The tree preserves the synchronous digital hierarchy.
After NCDP has determined that its algorithm has converged
it superimposes the clock distribution tree on the
underlying network and the result is a synchronized
network. |
| ciscoAtmNetworkClockMIBObjects | 1.3.6.1.4.1.9.9.121.1 | | | |
| cncGlobal | 1.3.6.1.4.1.9.9.121.1.1 | | | |
| INT cncDistributionMethod | 1.3.6.1.4.1.9.9.121.1.1.1 | INTEGER | read-write | The method used to distribute network clock for the device.
When the mode of operation is 'ncdp', the services provided
by the NCDP entity are in use. When this is the case, NCDP
entities residing on adjacent nodes exchange protocol
messages that are used by the resident NCDP entity to select
clock source such that a network-wide clock distribution
tree is constructed. When the mode of operation is manual,
the NCDP entity is not in use and sources of network clock
are statically configured. When this is the case, the
construction of a network-wide clock distribution tree is
done manually by a network administrator or NMS
application. |
| T/F cncNotificationOnChange | 1.3.6.1.4.1.9.9.121.1.1.2 | TruthValue | read-write | The value of this object determines whether a notification
should be generated due to a change in the device's root
clock source (given by the value of cncRootClockSource).
A value of 'true' enables the generation of notifications;
'false' disables notification generation. |
| CNC cncNodeStratum | 1.3.6.1.4.1.9.9.121.1.1.3 | CncStratum | read-only | The stratum at which the device exists in the Synchronous
Digital Hierarchy (See American National Standards
Institute, ANSI T1.101, 'Synchronization Interface for
Digital Networks' and Bell Communications Research,
GR-436-CORE, 'Digital Network Synchronization Plan' for
more detailed information regarding stratum.).
The resident NCDP entity uses the value of this object to
enforce the network clock distribution stratum hierarchy.
This object is only used by the NCDP protocol entity. |
| I32 cncNcdpMaxDiameter | 1.3.6.1.4.1.9.9.121.1.1.4 | Integer32 | read-write | The maximum possible height of a network clock distribution
tree in the network. (Alternatively this is known as the
maximum diameter of the network of devices that are
participating in NCDP.) If all of the nodes in the network
are participating in the protocol then the maximum height of
the network clock distribution tree is exactly the maximum
diameter of the network. If a proper subset of the nodes
are participating in the NCDP then the maximum height of a
network clock distribution tree is the maximum diameter of
the subnetwork induced by the removal of the
non-participating nodes and their associated links.
The NCDP protocol entity uses the value of this object to
determine when the NCDP algorithm has converged. All
devices participating in NCDP within the bounds of the
network must use the same value for maximum network diameter
for the NCDP algorithm to operate properly. If the value of
this object is set too small the resultant network may
exhibit unstable clocking characteristics and may constantly
switch clock sources. If the value is much larger than the
network diameter, the algorithm will take longer to declare
convergence than if the diameter were set closer to the
actual maximum network diameter, the result being that it
will take longer for the network to resynchronize after a
switchover to a secondary clock source located on a
secondary device.
This object is only used by the NCDP protocol entity. |
| I32 cncNcdpMessageInterval | 1.3.6.1.4.1.9.9.121.1.1.5 | Integer32 | read-write | The interval at which NCDP configuration PDUs are to be
generated.
The message interval directly affects the convergence time
of the NCDP algorithm. Convergence time is equal to the max
network diameter * message interval + transmission delays +
the time a configuration PDU is spent being processed in
each device. Thus if transmission delays and processing
delays are both close to 0, the convergence time is
approximately ( max network diameter * message interval )
milliseconds.
The value of cncNcdpHoldTime should normally match the value
of this object.
This object is only used by the NCDP protocol entity. |
| I32 cncNcdpHoldTime | 1.3.6.1.4.1.9.9.121.1.1.6 | Integer32 | read-write | The delay between the transmission of NCDP configuration
PDUs.
The hold time is used to limit the transmission of NCDP
configuration PDUs out of an interface to a maximum of one
configuration PDU per hold time interval per interface.
The value of this object should normally be set to match the
value of cncNcdpMessageInterval. If the value of this
object is higher than the value of cncNcdpMessageInterval,
NCDP configuration PDUs will end up being propagated at
the rate specified by the value of this object instead.
This object is only used by the NCDP protocol entity. |
| INT cncSourceChangeReason | 1.3.6.1.4.1.9.9.121.1.1.7 | INTEGER | read-only | The reason for the most recent change of a source of
network clock, as indicated by the change in the value
of cncSourceChangeTimeStamp.
'none' indicates that the source of network clock
has not changed.
'lossOfLock' indicates that the clock source was
changed because the network clocking hardware lost
lock on the previous network clock source.
'lossOfActivity' indicates that the clock source was changed
because the network clocking hardware detected a loss of
activity on the previous network clock source.
'ncdpRestructure' indicates that the NCDP entity has changed
the clock source as a result of a network-wide network clock
distribution tree restructuring process.
When the reason for a clock switchover is none of the
above, the value of this object is 'other'. |
| TIM cncSourceChangeTimeStamp | 1.3.6.1.4.1.9.9.121.1.1.8 | TimeStamp | read-only | The value of sysUpTime when the most recent change of a
source of network clock occurred.
A value of 0 indicates that no such event has occurred since
the instantiation of this object. |
| PHY cncRootClockSource | 1.3.6.1.4.1.9.9.121.1.1.9 | PhysicalIndex | read-only | The entPhysicalIndex of the network clock source that is
actively supplying network clock within the device. |
| cncManualSource | 1.3.6.1.4.1.9.9.121.1.2 | | | |
| cncManualSourceTable | 1.3.6.1.4.1.9.9.121.1.2.1 | | not-accessible | A table of network clock sources available to the managed
system. |
| cncManualSourceEntry | 1.3.6.1.4.1.9.9.121.1.2.1.1 | | not-accessible | Network clock status and statistics for sources of network
clock. When the value of cncDistributionMethod is 'manual',
the managed system uses this table to select a source of
network clock for the managed system. Within this table a
physical entity that is a source of network clock is
identified by cncManualSourceId. Table entries are indexed
by priority (cncManualSourcePriority).
A source of network clock for the device may be an
oscillator local to the device, a Building Integrated
Timing Supply (BITS) port or an interface that supports
synchronous clock recovery. (BITS is explained in more
detail in Bell Communications Research, GR-436-CORE,
'Digital Network Synchronization Plan'.)
When the managed system initializes it creates a row for
the device's default source of network clock, (the entry
having cncManualSourcePriority with value 'default'). The
only operations allowed on the columnar objects in this
particular row are read operations.
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. When a
management station creates a row it creates it explicitly
using RowStatus with either createAndGo or createAndWait.
A row is not made active until a valid value for
cncManualSourceId is supplied. A management station may
perform a write operation on any columnar object while the
row is active or not in service.
The value of any instance of cncManualSourceId located in
the table is unique except when the value refers to the
device's default source of network clock; any instance of
cncManualSourceId within the table may have this value at
any time. |
| INT cncManualSourcePriority | 1.3.6.1.4.1.9.9.121.1.2.1.1.1 | INTEGER | not-accessible | A value used to identify a source of network clock
available to the device's manual network clock selection
algorithm. |
| PHY cncManualSourceId | 1.3.6.1.4.1.9.9.121.1.2.1.1.2 | PhysicalIndex | read-create | The entPhysicalIndex that uniquely identifies a source of
network clock within the managed system. |
| CNC cncManualSourceHealth | 1.3.6.1.4.1.9.9.121.1.2.1.1.3 | CncHealth | read-only | The health of the clock source identified by
cncManualSourceId. |
| ROW cncManualRowStatus | 1.3.6.1.4.1.9.9.121.1.2.1.1.4 | RowStatus | read-create | The status of this conceptual row. |
| cncNcdpSource | 1.3.6.1.4.1.9.9.121.1.3 | | | |
| cncNcdpSourceTable | 1.3.6.1.4.1.9.9.121.1.3.1 | | not-accessible | A table of configured network clock sources available to
the managed system for use by the NCDP protocol entity. |
| cncNcdpSourceEntry | 1.3.6.1.4.1.9.9.121.1.3.1.1 | | not-accessible | Network clock status and statistics for sources of network
clock identified by entPhysicalIndex and used by the managed
system when the value of cncDistributionMethod is 'ncdp'.
A source of network clock for the device may be an
oscillator local to the device, a Building Integrated Timing
Supply (BITS) port or an interface that supports synchronous
clock recovery.
(BITS is explained in more detail in Bell Communications
Research, GR-436-CORE, 'Digital Network Synchronization
Plan'.)
The NCDP protocol entity 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 cncRootClockSource is used
as an index into this table and the indicated clock source
has cncNcdpBestClockSource 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 cncNcdpPriority object; only
read operations are allowed on all other columnar objects
within this specific row. The status of this row is always
active. The default source can always be found by issuing a
read operation on the row within cncManualSourceTable indexed
by 'default' (as the value of cncManualSourcePriority). The
cncManualSourceId object contains the entPhysicalIndex of the
default source of network clock and identifies it within this
table.
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. When a
management station creates a row it creates it explicitly
using RowStatus with either createAndGo or createAndWait.
A row is not made active until all read-create objects not
having default values are properly initialized.
The values of cncNcdpPriority, cncNcdpStratum and
cncNcdpPRSReference collectively describe a source of network
clock, that is they are three components of a vector used as
an input to the NCDP algorithm to make clock source selection
decisions. The management station must make the row
notInService before changing the values of any of these
objects. |
| T/F cncNcdpBestClockSource | 1.3.6.1.4.1.9.9.121.1.3.1.1.1 | TruthValue | read-only | An indication of whether the NCDP entity is presently
advertising this clock source as the best clock source
available in this table. |
| I32 cncNcdpPriority | 1.3.6.1.4.1.9.9.121.1.3.1.1.2 | Integer32 | read-create | The network-wide priority of this clock source if
configured as a source of network clock for NCDP. The
highest priority clock source is that clock source having
the lowest positive numeric value. The clock source with
the highest priority is selected as the root of the clock
distribution tree by the NCDP algorithm. If more that one
clock source is configured with with the same priority the
NCDP algorithm uses the value cncNcdpStratum as a
tiebreaker. |
| CNC cncNcdpStratum | 1.3.6.1.4.1.9.9.121.1.3.1.1.3 | CncStratum | read-create | The stratum level associated with this clock source if
configured as a source of network clock for NCDP. (See
American National Standards Institute, ANSI T1.101,
'Synchronization Interface for Digital Networks' and Bell
Communications Research, GR-436-CORE, 'Digital Network
Synchronization Plan' for more detailed information
regarding stratum.). If the value of this object is used
as a tiebreaker by the NCDP protocol entity, the lower of
the given values is the winner. If the values are the
same, the value of cncNcdpPRSReference is used as a
tiebreaker by the NCDP algorithm. |
| INT cncNcdpPRSReference | 1.3.6.1.4.1.9.9.121.1.3.1.1.4 | INTEGER | read-create | An value that identifies the primary reference source that
the network clock available from this source is traceable
to if configured as a source of network clock for NCDP.
(See American National Standards Institute, ANSI T1.101,
'Synchronization Interface for Digital Networks' and Bell
Communications Research, GR-436-CORE, 'Digital Network
Synchronization Plan' for more detailed information
regarding Primary Reference Sources.). If a source of
network clock is an onboard oscillator local to the device
it is 'internal' otherwise it is 'external'. If the value
of this object is used as a tiebreaker by the NCDP
algorithm,'external' wins over 'internal'.
All 'external' sources of network clock are assumed to be
traceable to the same PRS by the NCDP protocol entity. |
| CNC cncNcdpSourceHealth | 1.3.6.1.4.1.9.9.121.1.3.1.1.5 | CncHealth | read-only | The health of the clock source associated with this row. |
| ROW cncNcdpRowStatus | 1.3.6.1.4.1.9.9.121.1.3.1.1.6 | RowStatus | read-create | The status of this conceptual row. |
| cncNcdp | 1.3.6.1.4.1.9.9.121.1.4 | | | |
| cncNcdpAtmTable | 1.3.6.1.4.1.9.9.121.1.4.1 | | not-accessible | A table containing the status of NCDP on the device's ATM
interfaces. |
| cncNcdpAtmEntry | 1.3.6.1.4.1.9.9.121.1.4.1.1 | | not-accessible | An entry in the cncNcdpAtm table containing the status of
Ncdp on an ATM interface.
A row in this table is created by the managed system and
disappears when the associated physical entity disappears.
When a row is created all of the row objects are
instantiated. |
| T/F cncNcdpEnable | 1.3.6.1.4.1.9.9.121.1.4.1.1.1 | TruthValue | read-write | An indication of whether NCDP is presently running on an
interface. When NCDP is enabled for an interface, the
interface is an active member of the clock distribution
topology as seen by the NCDP protocol entity.
After this object is instantiated by the agent the
managed system initializes the value of this object to 'true'
if it determines that the physical interface is an ATM
Network-to-Network Interface (see ATM Forum Private
Network-Network Interface Specification Version 1.0). In
all other cases the managed system initializes the value of
this object to 'false'. |
| I32 cncNcdpAdminWeight | 1.3.6.1.4.1.9.9.121.1.4.1.1.2 | Integer32 | read-write | A weight metric used by the NCDP protocol entity and
associated with a physical interface that supports
synchronous clock recovery. When NCDP is enabled for the
physical interface the value of this object is used by NCDP
algorithms during tree computations.
The lower the administrative weight, the more attractive
the given link is to the NCDP algorithm. If the weight of
a link is changed, it can cause the NCDP protocol entity
to reconstruct the clock distribution tree. |
| I32 cncNcdpVpi | 1.3.6.1.4.1.9.9.121.1.4.1.1.3 | Integer32 | read-write | The VPI value of the VCC supporting the NCDP entity at this
ATM interface. If the values of cncNcdpVpi and
cncNcdpVci are both equal to zero then the NCDP entity
is not supported at this ATM interface. |
| I32 cncNcdpVci | 1.3.6.1.4.1.9.9.121.1.4.1.1.4 | Integer32 | read-write | The VCI value of the VCC supporting the NCDP entity at this
ATM interface. If the values of cncNcdpVpi and
cncNcdpVci are both equal to zero then the NCDP entity
is not supported at this ATM interface. |
| CNC cncNcdpHealth | 1.3.6.1.4.1.9.9.121.1.4.1.1.5 | CncHealth | read-only | The health of the clock source associated with this row. |
| ciscoAtmNetworkClockNotificationPrefix | 1.3.6.1.4.1.9.9.121.2 | | | |
| ciscoAtmNetworkClockMIBNotifications | 1.3.6.1.4.1.9.9.121.2.0 | | | |
| NTF cncNotifySourceChange | 1.3.6.1.4.1.9.9.121.2.0.1 | | | This notification indicates that the agent has detected a
change in the device's root source of network clock. This
notification is generated whenever there is a switchover
from one clock source to another. |
| ciscoAtmNetworkClockConformance | 1.3.6.1.4.1.9.9.121.3 | | | |
| ciscoAtmNetworkClockMIBCompliances | 1.3.6.1.4.1.9.9.121.3.1 | | | |
| cncMIBCompliance | 1.3.6.1.4.1.9.9.121.3.1.1 | | | The compliance statement for SNMPv2 entities which
implement network clock distribution methods and NCDP. |
| ciscoAtmNetworkClockMIBGroups | 1.3.6.1.4.1.9.9.121.3.2 | | | |
| cncGroup | 1.3.6.1.4.1.9.9.121.3.2.1 | | | The cnc group of objects providing for management of
network clock distribution and NCDP entities. |
| cncNotificationGroup | 1.3.6.1.4.1.9.9.121.3.2.2 | | | Conformance group for cnc notifications. |
